./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-15/cstrlen_diffterm_alloca.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-15/cstrlen_diffterm_alloca.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire --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 64bit --witnessprinter.graph.data.programhash c025debcc565a2dee63ce0651143a120d30d92e148bf87ae3ffecb509f27f776 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:30:20,470 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:30:20,592 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-11-23 21:30:20,600 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:30:20,601 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:30:20,640 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:30:20,641 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:30:20,642 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:30:20,643 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:30:20,648 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:30:20,648 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:30:20,649 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:30:20,650 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:30:20,652 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:30:20,652 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:30:20,653 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:30:20,653 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:30:20,653 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:30:20,654 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:30:20,654 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:30:20,655 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:30:20,655 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:30:20,656 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:30:20,657 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:30:20,658 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:30:20,658 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:30:20,658 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:30:20,659 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:30:20,659 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:30:20,660 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:30:20,661 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:30:20,661 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:30:20,662 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:30:20,662 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:30:20,662 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:30:20,662 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:30:20,663 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:30:20,663 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:30:20,663 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:30:20,664 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:30:20,664 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:30:20,664 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:30:20,664 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:30:20,665 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:30:20,665 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:30:20,666 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_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c025debcc565a2dee63ce0651143a120d30d92e148bf87ae3ffecb509f27f776 [2023-11-23 21:30:21,033 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:30:21,071 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:30:21,074 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:30:21,075 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:30:21,076 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:30:21,078 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/termination-15/cstrlen_diffterm_alloca.i [2023-11-23 21:30:24,165 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:30:24,570 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:30:24,571 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/sv-benchmarks/c/termination-15/cstrlen_diffterm_alloca.i [2023-11-23 21:30:24,587 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/data/79b1f4628/74d48b79719c4ae6857abb61328d93be/FLAG4f3cdf6d9 [2023-11-23 21:30:24,602 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/data/79b1f4628/74d48b79719c4ae6857abb61328d93be [2023-11-23 21:30:24,605 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:30:24,606 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:30:24,608 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:30:24,608 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:30:24,613 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:30:24,614 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:30:24" (1/1) ... [2023-11-23 21:30:24,615 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@64afac29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:24, skipping insertion in model container [2023-11-23 21:30:24,615 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:30:24" (1/1) ... [2023-11-23 21:30:24,651 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:30:24,997 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:30:25,012 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:30:25,071 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:30:25,116 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:30:25,117 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25 WrapperNode [2023-11-23 21:30:25,117 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:30:25,118 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:30:25,118 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:30:25,119 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:30:25,127 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,150 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,174 INFO L138 Inliner]: procedures = 152, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 36 [2023-11-23 21:30:25,174 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:30:25,175 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:30:25,175 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:30:25,175 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:30:25,184 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,185 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,198 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,198 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,203 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,206 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,207 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,210 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,218 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:30:25,219 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:30:25,219 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:30:25,219 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:30:25,221 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (1/1) ... [2023-11-23 21:30:25,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:30:25,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:25,249 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:30:25,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:30:25,285 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:30:25,285 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:30:25,285 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:30:25,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:30:25,285 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:30:25,286 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:30:25,381 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:30:25,383 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:30:25,551 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:30:25,600 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:30:25,600 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 21:30:25,602 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:30:25 BoogieIcfgContainer [2023-11-23 21:30:25,602 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:30:25,605 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:30:25,605 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:30:25,609 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:30:25,609 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:30:24" (1/3) ... [2023-11-23 21:30:25,610 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60237bda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:30:25, skipping insertion in model container [2023-11-23 21:30:25,610 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:25" (2/3) ... [2023-11-23 21:30:25,620 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60237bda and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:30:25, skipping insertion in model container [2023-11-23 21:30:25,620 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:30:25" (3/3) ... [2023-11-23 21:30:25,622 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrlen_diffterm_alloca.i [2023-11-23 21:30:25,652 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:30:25,653 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 5 error locations. [2023-11-23 21:30:25,700 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:30:25,708 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;@4c53efa6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:30:25,708 INFO L358 AbstractCegarLoop]: Starting to check reachability of 5 error locations. [2023-11-23 21:30:25,712 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:25,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-23 21:30:25,717 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:25,718 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-23 21:30:25,719 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:25,724 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:25,724 INFO L85 PathProgramCache]: Analyzing trace with hash 2274, now seen corresponding path program 1 times [2023-11-23 21:30:25,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:25,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770478366] [2023-11-23 21:30:25,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:25,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:25,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:25,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:25,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:25,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770478366] [2023-11-23 21:30:25,961 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770478366] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:25,961 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:25,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:30:25,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676429962] [2023-11-23 21:30:25,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:25,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:30:25,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:26,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:30:26,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:30:26,049 INFO L87 Difference]: Start difference. First operand has 12 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:26,103 INFO L93 Difference]: Finished difference Result 11 states and 11 transitions. [2023-11-23 21:30:26,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:30:26,108 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2023-11-23 21:30:26,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:26,116 INFO L225 Difference]: With dead ends: 11 [2023-11-23 21:30:26,116 INFO L226 Difference]: Without dead ends: 10 [2023-11-23 21:30:26,117 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 [2023-11-23 21:30:26,125 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 7 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:26,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 4 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:30:26,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-23 21:30:26,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-23 21:30:26,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 9 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) [2023-11-23 21:30:26,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2023-11-23 21:30:26,161 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 2 [2023-11-23 21:30:26,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:26,162 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2023-11-23 21:30:26,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,164 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2023-11-23 21:30:26,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-23 21:30:26,165 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:26,165 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-23 21:30:26,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:30:26,166 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:26,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:26,168 INFO L85 PathProgramCache]: Analyzing trace with hash 2275, now seen corresponding path program 1 times [2023-11-23 21:30:26,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:26,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613108997] [2023-11-23 21:30:26,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:26,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:26,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:26,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:26,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:26,559 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613108997] [2023-11-23 21:30:26,559 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [613108997] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:26,560 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:26,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:30:26,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592594929] [2023-11-23 21:30:26,569 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:26,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:30:26,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:26,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:30:26,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:30:26,572 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:26,589 INFO L93 Difference]: Finished difference Result 9 states and 9 transitions. [2023-11-23 21:30:26,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:30:26,590 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2023-11-23 21:30:26,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:26,591 INFO L225 Difference]: With dead ends: 9 [2023-11-23 21:30:26,592 INFO L226 Difference]: Without dead ends: 9 [2023-11-23 21:30:26,592 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 [2023-11-23 21:30:26,594 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:26,597 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 4 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:30:26,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-23 21:30:26,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-23 21:30:26,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 6 states have (on average 1.5) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-23 21:30:26,603 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 2 [2023-11-23 21:30:26,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:26,604 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-23 21:30:26,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,604 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-23 21:30:26,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:30:26,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:26,606 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:30:26,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:30:26,606 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:26,607 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:26,609 INFO L85 PathProgramCache]: Analyzing trace with hash 71350, now seen corresponding path program 1 times [2023-11-23 21:30:26,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:26,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661958711] [2023-11-23 21:30:26,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:26,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:26,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:26,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:26,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:26,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661958711] [2023-11-23 21:30:26,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661958711] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:26,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:26,729 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:30:26,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391915941] [2023-11-23 21:30:26,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:26,730 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:30:26,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:26,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:30:26,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:30:26,732 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 3 states, 2 states have (on average 1.5) 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) [2023-11-23 21:30:26,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:26,760 INFO L93 Difference]: Finished difference Result 8 states and 8 transitions. [2023-11-23 21:30:26,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:30:26,761 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) 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 [2023-11-23 21:30:26,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:26,762 INFO L225 Difference]: With dead ends: 8 [2023-11-23 21:30:26,762 INFO L226 Difference]: Without dead ends: 8 [2023-11-23 21:30:26,763 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 [2023-11-23 21:30:26,771 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 2 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:26,774 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 2 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:30:26,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-23 21:30:26,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-23 21:30:26,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 7 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2023-11-23 21:30:26,782 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 3 [2023-11-23 21:30:26,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:26,783 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2023-11-23 21:30:26,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) 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) [2023-11-23 21:30:26,784 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2023-11-23 21:30:26,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:30:26,785 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:26,785 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:30:26,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:30:26,786 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:26,786 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:26,787 INFO L85 PathProgramCache]: Analyzing trace with hash 71351, now seen corresponding path program 1 times [2023-11-23 21:30:26,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:26,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731045401] [2023-11-23 21:30:26,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:26,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:26,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:26,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:26,910 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:26,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731045401] [2023-11-23 21:30:26,910 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731045401] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:26,910 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:26,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:30:26,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155568122] [2023-11-23 21:30:26,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:26,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:30:26,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:26,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:30:26,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:30:26,915 INFO L87 Difference]: Start difference. First operand 8 states and 8 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) [2023-11-23 21:30:26,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:26,955 INFO L93 Difference]: Finished difference Result 11 states and 12 transitions. [2023-11-23 21:30:26,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:30:26,956 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 [2023-11-23 21:30:26,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:26,956 INFO L225 Difference]: With dead ends: 11 [2023-11-23 21:30:26,956 INFO L226 Difference]: Without dead ends: 11 [2023-11-23 21:30:26,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:30:26,961 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:26,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 5 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:30:26,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-23 21:30:26,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 9. [2023-11-23 21:30:26,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:26,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-23 21:30:26,966 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 3 [2023-11-23 21:30:26,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:26,967 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-23 21:30:26,967 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) [2023-11-23 21:30:26,968 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-23 21:30:26,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:30:26,968 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:26,968 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:30:26,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:30:26,969 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:26,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:26,970 INFO L85 PathProgramCache]: Analyzing trace with hash 68567184, now seen corresponding path program 1 times [2023-11-23 21:30:26,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:26,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058078311] [2023-11-23 21:30:26,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:26,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:26,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:27,447 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:27,447 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:27,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058078311] [2023-11-23 21:30:27,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058078311] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:27,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257975629] [2023-11-23 21:30:27,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:27,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:27,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:27,454 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:27,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:30:27,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:27,534 WARN L260 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-23 21:30:27,541 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:27,624 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:30:27,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-23 21:30:27,796 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:30:27,797 INFO L378 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 17 treesize of output 15 [2023-11-23 21:30:27,879 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:27,879 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:28,026 INFO L378 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 [2023-11-23 21:30:28,035 INFO L378 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 [2023-11-23 21:30:28,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:28,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257975629] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:30:28,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1256902599] [2023-11-23 21:30:28,094 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-23 21:30:28,094 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:28,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:28,104 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:28,105 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:29,080 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:29,368 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '143#(and (= |ULTIMATE.start_cstrlen_#in~s#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrlen_~p~0#1.base|) |ULTIMATE.start_cstrlen_~p~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc208#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 2 |ULTIMATE.start_cstrlen_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc208#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~p~0#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrlen_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~p~0#1.base|))' at error location [2023-11-23 21:30:29,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:29,368 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:30:29,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-11-23 21:30:29,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827711847] [2023-11-23 21:30:29,369 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:29,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:30:29,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:29,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:30:29,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:30:29,373 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2023-11-23 21:30:29,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:29,561 INFO L93 Difference]: Finished difference Result 14 states and 16 transitions. [2023-11-23 21:30:29,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:30:29,563 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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 [2023-11-23 21:30:29,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:29,564 INFO L225 Difference]: With dead ends: 14 [2023-11-23 21:30:29,565 INFO L226 Difference]: Without dead ends: 14 [2023-11-23 21:30:29,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:30:29,566 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:29,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 7 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:30:29,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-23 21:30:29,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 11. [2023-11-23 21:30:29,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 9 states have (on average 1.3333333333333333) 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) [2023-11-23 21:30:29,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2023-11-23 21:30:29,571 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 5 [2023-11-23 21:30:29,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:29,572 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2023-11-23 21:30:29,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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) [2023-11-23 21:30:29,572 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2023-11-23 21:30:29,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:30:29,573 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:29,576 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:30:29,606 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:29,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:29,793 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:29,794 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:29,794 INFO L85 PathProgramCache]: Analyzing trace with hash 2125581404, now seen corresponding path program 1 times [2023-11-23 21:30:29,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:29,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783724571] [2023-11-23 21:30:29,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:29,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:29,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:29,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:29,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:29,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783724571] [2023-11-23 21:30:29,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783724571] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:29,925 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:29,926 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:30:29,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510543180] [2023-11-23 21:30:29,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:29,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:30:29,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:29,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:30:29,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:30:29,928 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:29,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:29,948 INFO L93 Difference]: Finished difference Result 10 states and 11 transitions. [2023-11-23 21:30:29,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:30:29,949 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:30:29,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:29,950 INFO L225 Difference]: With dead ends: 10 [2023-11-23 21:30:29,950 INFO L226 Difference]: Without dead ends: 8 [2023-11-23 21:30:29,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:30:29,952 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:29,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 6 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:30:29,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-23 21:30:29,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-23 21:30:29,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:29,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2023-11-23 21:30:29,956 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2023-11-23 21:30:29,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:29,957 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2023-11-23 21:30:29,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:29,957 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2023-11-23 21:30:29,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:30:29,958 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:29,958 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1] [2023-11-23 21:30:29,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:30:29,959 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:29,959 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:29,959 INFO L85 PathProgramCache]: Analyzing trace with hash 1468553257, now seen corresponding path program 2 times [2023-11-23 21:30:29,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:29,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941112203] [2023-11-23 21:30:29,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:29,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:29,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:30,468 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:30,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:30,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941112203] [2023-11-23 21:30:30,469 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941112203] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:30,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514086461] [2023-11-23 21:30:30,469 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:30:30,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:30,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:30,471 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:30,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:30:30,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:30:30,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:30:30,536 WARN L260 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-23 21:30:30,538 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:30,569 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:30:30,784 INFO L349 Elim1Store]: treesize reduction 4, result has 76.5 percent of original size [2023-11-23 21:30:30,785 INFO L378 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 [2023-11-23 21:30:30,857 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:30,857 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:31,100 INFO L378 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 [2023-11-23 21:30:31,107 INFO L378 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 [2023-11-23 21:30:31,119 INFO L378 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 [2023-11-23 21:30:31,158 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:31,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514086461] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:30:31,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [249204094] [2023-11-23 21:30:31,161 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-23 21:30:31,161 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:31,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:31,161 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:31,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:31,825 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:32,207 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '257#(and (= |ULTIMATE.start_cstrlen_#in~s#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrlen_~p~0#1.base|) |ULTIMATE.start_cstrlen_~p~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc208#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 2 |ULTIMATE.start_cstrlen_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc208#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~p~0#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrlen_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~p~0#1.base|))' at error location [2023-11-23 21:30:32,207 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:32,207 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:30:32,207 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 18 [2023-11-23 21:30:32,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749828722] [2023-11-23 21:30:32,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:32,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-23 21:30:32,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:32,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-23 21:30:32,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2023-11-23 21:30:32,210 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:32,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:32,844 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2023-11-23 21:30:32,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:30:32,844 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:30:32,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:32,845 INFO L225 Difference]: With dead ends: 13 [2023-11-23 21:30:32,845 INFO L226 Difference]: Without dead ends: 13 [2023-11-23 21:30:32,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2023-11-23 21:30:32,846 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 18 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:32,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 0 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:30:32,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-23 21:30:32,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2023-11-23 21:30:32,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 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) [2023-11-23 21:30:32,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2023-11-23 21:30:32,850 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 7 [2023-11-23 21:30:32,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:32,850 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2023-11-23 21:30:32,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:32,850 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2023-11-23 21:30:32,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:30:32,851 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:32,851 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1] [2023-11-23 21:30:32,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:33,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:33,052 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:33,052 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:33,053 INFO L85 PathProgramCache]: Analyzing trace with hash 768446619, now seen corresponding path program 3 times [2023-11-23 21:30:33,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:33,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866030378] [2023-11-23 21:30:33,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:33,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:33,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:33,627 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:33,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:33,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866030378] [2023-11-23 21:30:33,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866030378] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:33,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890392030] [2023-11-23 21:30:33,627 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:30:33,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:33,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:33,630 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:33,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:30:33,700 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:30:33,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:30:33,702 WARN L260 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-23 21:30:33,704 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:33,735 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:30:34,167 INFO L349 Elim1Store]: treesize reduction 12, result has 63.6 percent of original size [2023-11-23 21:30:34,167 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 41 treesize of output 39 [2023-11-23 21:30:34,248 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:34,249 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:34,792 INFO L378 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 59 treesize of output 51 [2023-11-23 21:30:34,798 INFO L378 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 [2023-11-23 21:30:34,809 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 45 [2023-11-23 21:30:34,858 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:34,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890392030] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:30:34,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319775065] [2023-11-23 21:30:34,860 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-23 21:30:34,861 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:34,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:34,861 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:34,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:35,364 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:35,855 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '390#(and (= |ULTIMATE.start_cstrlen_#in~s#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrlen_~p~0#1.base|) |ULTIMATE.start_cstrlen_~p~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc208#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 2 |ULTIMATE.start_cstrlen_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc208#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~p~0#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrlen_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~p~0#1.base|))' at error location [2023-11-23 21:30:35,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:35,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:30:35,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10] total 27 [2023-11-23 21:30:35,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442722841] [2023-11-23 21:30:35,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:35,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-23 21:30:35,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:35,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-23 21:30:35,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=862, Unknown=0, NotChecked=0, Total=992 [2023-11-23 21:30:35,858 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:37,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:37,554 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2023-11-23 21:30:37,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-23 21:30:37,555 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:30:37,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:37,556 INFO L225 Difference]: With dead ends: 21 [2023-11-23 21:30:37,556 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:30:37,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=368, Invalid=1888, Unknown=0, NotChecked=0, Total=2256 [2023-11-23 21:30:37,558 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 39 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:37,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 0 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:30:37,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:30:37,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-11-23 21:30:37,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:37,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2023-11-23 21:30:37,562 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 11 [2023-11-23 21:30:37,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:37,563 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2023-11-23 21:30:37,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:37,563 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2023-11-23 21:30:37,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:30:37,564 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:37,564 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1] [2023-11-23 21:30:37,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:37,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:37,765 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:37,765 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:37,766 INFO L85 PathProgramCache]: Analyzing trace with hash 889448063, now seen corresponding path program 4 times [2023-11-23 21:30:37,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:37,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858483626] [2023-11-23 21:30:37,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:37,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:37,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:38,748 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:38,748 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:38,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858483626] [2023-11-23 21:30:38,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858483626] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:38,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527909945] [2023-11-23 21:30:38,749 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:30:38,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:38,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:38,750 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:38,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:30:38,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:38,826 WARN L260 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 77 conjunts are in the unsatisfiable core [2023-11-23 21:30:38,829 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:38,876 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-23 21:30:40,909 INFO L349 Elim1Store]: treesize reduction 28, result has 68.5 percent of original size [2023-11-23 21:30:40,910 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 28 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 8 case distinctions, treesize of input 88 treesize of output 95 [2023-11-23 21:30:40,932 WARN L667 sPolynomialRelations]: Constructing 128(two to the power of 7 dual juncts. [2023-11-23 21:30:40,968 WARN L667 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2023-11-23 21:30:41,163 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:41,163 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:43,314 INFO L378 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 119 treesize of output 103 [2023-11-23 21:30:43,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 8 select indices, 8 select index equivalence classes, 28 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 183 treesize of output 153 [2023-11-23 21:30:43,366 WARN L667 sPolynomialRelations]: Constructing 256(two to the power of 8 dual juncts. [2023-11-23 21:30:43,436 INFO L378 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 13 treesize of output 9 [2023-11-23 21:30:43,459 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:43,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527909945] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:30:43,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1962085711] [2023-11-23 21:30:43,465 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-23 21:30:43,466 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:43,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:43,466 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:43,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:43,965 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:45,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '622#(and (= |ULTIMATE.start_cstrlen_#in~s#1.offset| 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrlen_~p~0#1.base|) |ULTIMATE.start_cstrlen_~p~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc208#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 2 |ULTIMATE.start_cstrlen_#in~s#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc208#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~s#1.base|) (<= 0 |ULTIMATE.start_cstrlen_~p~0#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrlen_~s#1.offset| 0) (<= 2 |ULTIMATE.start_cstrlen_~p~0#1.base|))' at error location [2023-11-23 21:30:45,242 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:45,242 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:30:45,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 18, 18] total 46 [2023-11-23 21:30:45,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693300180] [2023-11-23 21:30:45,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:45,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-11-23 21:30:45,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:45,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-11-23 21:30:45,246 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2247, Unknown=0, NotChecked=0, Total=2550 [2023-11-23 21:30:45,246 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 48 states, 47 states have (on average 1.1914893617021276) 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) [2023-11-23 21:30:52,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:52,134 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2023-11-23 21:30:52,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-23 21:30:52,141 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.1914893617021276) 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) Word has length 19 [2023-11-23 21:30:52,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:52,142 INFO L225 Difference]: With dead ends: 37 [2023-11-23 21:30:52,142 INFO L226 Difference]: Without dead ends: 37 [2023-11-23 21:30:52,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 8 SyntacticMatches, 9 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1499 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=940, Invalid=5865, Unknown=1, NotChecked=0, Total=6806 [2023-11-23 21:30:52,146 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 86 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:52,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 0 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:30:52,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-23 21:30:52,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2023-11-23 21:30:52,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:30:52,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2023-11-23 21:30:52,161 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 19 [2023-11-23 21:30:52,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:52,162 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2023-11-23 21:30:52,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.1914893617021276) 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) [2023-11-23 21:30:52,163 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2023-11-23 21:30:52,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 21:30:52,165 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:52,165 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 1, 1, 1] [2023-11-23 21:30:52,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:52,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:52,384 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 2 more)] === [2023-11-23 21:30:52,384 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:52,384 INFO L85 PathProgramCache]: Analyzing trace with hash -2059524537, now seen corresponding path program 5 times [2023-11-23 21:30:52,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:52,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351300088] [2023-11-23 21:30:52,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:52,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:52,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:53,934 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:53,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:53,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351300088] [2023-11-23 21:30:53,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351300088] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:53,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264579272] [2023-11-23 21:30:53,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:30:53,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:53,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:53,940 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:53,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1c568636-1bae-4835-87a1-e204e92aa947/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:30:54,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-11-23 21:30:54,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:30:54,087 WARN L260 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 118 conjunts are in the unsatisfiable core [2023-11-23 21:30:54,093 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:54,152 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10