./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrcspn-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrcspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 15fe42cb945ebd9019cc38134c29264613097f232589ff55d01d33d66b19d85f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:09:26,831 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:09:26,937 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:09:26,943 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:09:26,944 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:09:26,979 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:09:26,980 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:09:26,980 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:09:26,981 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:09:26,982 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:09:26,983 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:09:26,983 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:09:26,984 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:09:26,985 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:09:26,985 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:09:26,986 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:09:26,986 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:09:26,987 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:09:26,988 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:09:26,988 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:09:26,989 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:09:26,989 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:09:26,990 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:09:26,991 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:09:26,991 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:09:26,992 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:09:26,992 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:09:26,993 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:09:26,993 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:09:26,994 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:09:26,994 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:09:26,994 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:09:26,995 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:09:26,995 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:09:26,996 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:09:26,996 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:09:26,997 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:09:26,997 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:09:26,997 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:09:26,998 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:09:26,998 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:09:26,999 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:09:26,999 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:09:26,999 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:09:26,999 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:09:26,999 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:09:27,000 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_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 15fe42cb945ebd9019cc38134c29264613097f232589ff55d01d33d66b19d85f [2023-11-12 00:09:27,390 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:09:27,424 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:09:27,427 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:09:27,428 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:09:27,430 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:09:27,431 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-memsafety/cstrcspn-alloca-1.i [2023-11-12 00:09:30,514 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:09:30,889 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:09:30,890 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/sv-benchmarks/c/array-memsafety/cstrcspn-alloca-1.i [2023-11-12 00:09:30,907 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/data/624317766/33e5c21c53c34ebe8946515c333ad75e/FLAG43cd9308f [2023-11-12 00:09:30,928 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/data/624317766/33e5c21c53c34ebe8946515c333ad75e [2023-11-12 00:09:30,941 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:09:30,944 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:09:30,945 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:09:30,946 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:09:30,952 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:09:30,953 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:09:30" (1/1) ... [2023-11-12 00:09:30,954 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61b077df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:30, skipping insertion in model container [2023-11-12 00:09:30,955 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:09:30" (1/1) ... [2023-11-12 00:09:31,016 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:09:31,424 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:09:31,437 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:09:31,478 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:09:31,508 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:09:31,509 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31 WrapperNode [2023-11-12 00:09:31,509 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:09:31,510 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:09:31,510 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:09:31,511 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:09:31,519 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,533 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,563 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 107 [2023-11-12 00:09:31,564 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:09:31,565 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:09:31,565 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:09:31,565 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:09:31,572 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,573 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,577 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,577 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,584 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,588 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,590 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,592 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,595 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:09:31,596 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:09:31,596 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:09:31,597 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:09:31,598 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (1/1) ... [2023-11-12 00:09:31,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:09:31,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:31,643 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:09:31,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:09:31,683 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:09:31,683 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:09:31,684 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:09:31,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:09:31,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:09:31,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:09:31,786 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:09:31,788 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:09:32,183 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:09:32,300 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:09:32,300 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-12 00:09:32,303 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:09:32 BoogieIcfgContainer [2023-11-12 00:09:32,303 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:09:32,306 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:09:32,306 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:09:32,310 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:09:32,310 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:09:30" (1/3) ... [2023-11-12 00:09:32,311 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@445893cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:09:32, skipping insertion in model container [2023-11-12 00:09:32,312 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:09:31" (2/3) ... [2023-11-12 00:09:32,312 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@445893cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:09:32, skipping insertion in model container [2023-11-12 00:09:32,326 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:09:32" (3/3) ... [2023-11-12 00:09:32,327 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrcspn-alloca-1.i [2023-11-12 00:09:32,349 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:09:32,349 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2023-11-12 00:09:32,403 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:09:32,413 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;@2a20b523, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:09:32,414 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2023-11-12 00:09:32,418 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:32,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:09:32,425 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:32,426 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:09:32,426 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:32,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:32,432 INFO L85 PathProgramCache]: Analyzing trace with hash 164108, now seen corresponding path program 1 times [2023-11-12 00:09:32,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:32,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160544457] [2023-11-12 00:09:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:32,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:32,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:32,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:32,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:32,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160544457] [2023-11-12 00:09:32,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160544457] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:32,868 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:32,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:09:32,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544117275] [2023-11-12 00:09:32,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:32,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:09:32,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:32,909 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:09:32,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:09:32,912 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:32,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:32,994 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-11-12 00:09:32,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:09:32,997 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:09:32,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:33,007 INFO L225 Difference]: With dead ends: 37 [2023-11-12 00:09:33,007 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:09:33,009 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:09:33,014 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:33,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:33,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:09:33,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-11-12 00:09:33,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:33,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2023-11-12 00:09:33,052 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2023-11-12 00:09:33,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:33,053 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2023-11-12 00:09:33,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:33,056 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2023-11-12 00:09:33,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:09:33,056 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:33,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:09:33,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:09:33,058 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:33,059 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:33,059 INFO L85 PathProgramCache]: Analyzing trace with hash 164109, now seen corresponding path program 1 times [2023-11-12 00:09:33,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:33,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205397490] [2023-11-12 00:09:33,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:33,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:33,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:33,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:33,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:33,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205397490] [2023-11-12 00:09:33,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205397490] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:33,514 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:33,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:09:33,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850999547] [2023-11-12 00:09:33,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:33,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:09:33,516 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:33,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:09:33,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:33,519 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:33,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:33,735 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2023-11-12 00:09:33,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:33,736 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:09:33,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:33,740 INFO L225 Difference]: With dead ends: 35 [2023-11-12 00:09:33,740 INFO L226 Difference]: Without dead ends: 35 [2023-11-12 00:09:33,741 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:33,743 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 1 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:33,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 65 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:33,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-12 00:09:33,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-12 00:09:33,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 34 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:33,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 40 transitions. [2023-11-12 00:09:33,750 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 40 transitions. Word has length 3 [2023-11-12 00:09:33,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:33,751 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 40 transitions. [2023-11-12 00:09:33,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:33,751 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 40 transitions. [2023-11-12 00:09:33,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:09:33,752 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:33,752 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:09:33,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:09:33,753 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:33,753 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:33,754 INFO L85 PathProgramCache]: Analyzing trace with hash 5197514, now seen corresponding path program 1 times [2023-11-12 00:09:33,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:33,754 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319812687] [2023-11-12 00:09:33,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:33,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:33,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:34,089 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:34,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:34,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319812687] [2023-11-12 00:09:34,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319812687] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:34,090 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:34,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:09:34,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235808116] [2023-11-12 00:09:34,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:34,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:09:34,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:34,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:09:34,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:34,096 INFO L87 Difference]: Start difference. First operand 35 states and 40 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:34,159 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2023-11-12 00:09:34,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:09:34,160 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:09:34,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:34,163 INFO L225 Difference]: With dead ends: 34 [2023-11-12 00:09:34,164 INFO L226 Difference]: Without dead ends: 34 [2023-11-12 00:09:34,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:34,173 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 72 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:34,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 18 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:34,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-12 00:09:34,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-11-12 00:09:34,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2023-11-12 00:09:34,186 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 4 [2023-11-12 00:09:34,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:34,187 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2023-11-12 00:09:34,191 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,192 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2023-11-12 00:09:34,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:09:34,193 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:34,193 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:09:34,193 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:09:34,194 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:34,195 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:34,199 INFO L85 PathProgramCache]: Analyzing trace with hash 5194558, now seen corresponding path program 1 times [2023-11-12 00:09:34,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:34,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898714433] [2023-11-12 00:09:34,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:34,200 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:34,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:34,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:34,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:34,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898714433] [2023-11-12 00:09:34,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898714433] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:34,505 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:34,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:09:34,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57290381] [2023-11-12 00:09:34,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:34,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:09:34,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:34,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:09:34,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:34,508 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:34,664 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2023-11-12 00:09:34,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:34,665 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:09:34,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:34,668 INFO L225 Difference]: With dead ends: 61 [2023-11-12 00:09:34,668 INFO L226 Difference]: Without dead ends: 61 [2023-11-12 00:09:34,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:34,679 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 97 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:34,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 29 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:34,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-12 00:09:34,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 32. [2023-11-12 00:09:34,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 31 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2023-11-12 00:09:34,696 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 4 [2023-11-12 00:09:34,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:34,696 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2023-11-12 00:09:34,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,696 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2023-11-12 00:09:34,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:09:34,697 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:34,697 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:09:34,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:09:34,698 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:34,698 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:34,698 INFO L85 PathProgramCache]: Analyzing trace with hash 5194559, now seen corresponding path program 1 times [2023-11-12 00:09:34,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:34,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955279103] [2023-11-12 00:09:34,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:34,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:34,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:34,853 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:34,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:34,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955279103] [2023-11-12 00:09:34,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955279103] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:34,854 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:34,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:34,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946612121] [2023-11-12 00:09:34,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:34,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:09:34,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:34,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:09:34,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:34,858 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:34,956 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-11-12 00:09:34,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:09:34,957 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:09:34,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:34,958 INFO L225 Difference]: With dead ends: 34 [2023-11-12 00:09:34,958 INFO L226 Difference]: Without dead ends: 34 [2023-11-12 00:09:34,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:09:34,960 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 38 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:34,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 48 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:34,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-12 00:09:34,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-11-12 00:09:34,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-11-12 00:09:34,969 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 4 [2023-11-12 00:09:34,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:34,969 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-11-12 00:09:34,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:34,970 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-11-12 00:09:34,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:09:34,970 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:34,970 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:09:34,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-12 00:09:34,971 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:34,972 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:34,972 INFO L85 PathProgramCache]: Analyzing trace with hash 161122929, now seen corresponding path program 1 times [2023-11-12 00:09:34,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:34,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937132860] [2023-11-12 00:09:34,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:34,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:35,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:35,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:35,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:35,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937132860] [2023-11-12 00:09:35,220 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937132860] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:35,220 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:35,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:35,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358877593] [2023-11-12 00:09:35,221 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:35,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:09:35,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:35,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:09:35,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:35,223 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:35,269 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2023-11-12 00:09:35,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:09:35,275 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-12 00:09:35,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:35,277 INFO L225 Difference]: With dead ends: 33 [2023-11-12 00:09:35,278 INFO L226 Difference]: Without dead ends: 33 [2023-11-12 00:09:35,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:35,279 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 65 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:35,279 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 16 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:09:35,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-12 00:09:35,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2023-11-12 00:09:35,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2023-11-12 00:09:35,292 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 5 [2023-11-12 00:09:35,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:35,293 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2023-11-12 00:09:35,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,293 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2023-11-12 00:09:35,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:09:35,294 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:35,294 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:09:35,294 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-12 00:09:35,294 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:35,295 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:35,295 INFO L85 PathProgramCache]: Analyzing trace with hash 699845551, now seen corresponding path program 1 times [2023-11-12 00:09:35,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:35,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75646730] [2023-11-12 00:09:35,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:35,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:35,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:35,434 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:35,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:35,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75646730] [2023-11-12 00:09:35,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75646730] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:35,434 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:35,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:35,435 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156540836] [2023-11-12 00:09:35,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:35,435 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:09:35,435 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:35,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:09:35,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:35,436 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:35,515 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-11-12 00:09:35,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:35,516 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:09:35,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:35,518 INFO L225 Difference]: With dead ends: 34 [2023-11-12 00:09:35,518 INFO L226 Difference]: Without dead ends: 34 [2023-11-12 00:09:35,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:09:35,520 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 89 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:35,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 16 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:35,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-12 00:09:35,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2023-11-12 00:09:35,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 32 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2023-11-12 00:09:35,531 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 6 [2023-11-12 00:09:35,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:35,531 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2023-11-12 00:09:35,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,531 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2023-11-12 00:09:35,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:09:35,532 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:35,532 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-12 00:09:35,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-12 00:09:35,533 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:35,533 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:35,533 INFO L85 PathProgramCache]: Analyzing trace with hash 699845550, now seen corresponding path program 1 times [2023-11-12 00:09:35,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:35,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007489085] [2023-11-12 00:09:35,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:35,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:35,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:35,579 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:35,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:35,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007489085] [2023-11-12 00:09:35,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007489085] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:35,580 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:35,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:35,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142691672] [2023-11-12 00:09:35,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:35,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:09:35,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:35,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:09:35,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:35,581 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:35,623 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2023-11-12 00:09:35,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:35,624 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:09:35,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:35,625 INFO L225 Difference]: With dead ends: 31 [2023-11-12 00:09:35,625 INFO L226 Difference]: Without dead ends: 31 [2023-11-12 00:09:35,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:35,627 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 49 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:35,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 18 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:09:35,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-12 00:09:35,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-12 00:09:35,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-11-12 00:09:35,642 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2023-11-12 00:09:35,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:35,642 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-11-12 00:09:35,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:35,643 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-11-12 00:09:35,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-12 00:09:35,643 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:35,643 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-11-12 00:09:35,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-12 00:09:35,644 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:35,644 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:35,645 INFO L85 PathProgramCache]: Analyzing trace with hash 697080176, now seen corresponding path program 1 times [2023-11-12 00:09:35,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:35,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346855878] [2023-11-12 00:09:35,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:35,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:35,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:35,905 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:35,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:35,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346855878] [2023-11-12 00:09:35,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346855878] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:09:35,905 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213107875] [2023-11-12 00:09:35,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:35,906 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:35,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:35,909 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:09:35,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:09:35,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:35,990 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:09:35,996 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:09:36,093 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-12 00:09:36,104 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:09:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:36,349 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:09:36,557 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:36,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213107875] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:09:36,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1888776834] [2023-11-12 00:09:36,576 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 00:09:36,576 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:09:36,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:09:36,585 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:09:36,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:09:37,667 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:09:38,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '697#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet17#1|)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_main_#t~nondet17#1| 127) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|) |ULTIMATE.start_main_~i~1#1|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_main_~length2~0#1|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647))' at error location [2023-11-12 00:09:38,192 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:09:38,192 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:09:38,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-11-12 00:09:38,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593693677] [2023-11-12 00:09:38,193 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:09:38,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:09:38,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:38,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:09:38,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:09:38,195 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:38,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:38,475 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2023-11-12 00:09:38,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:09:38,476 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-12 00:09:38,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:38,477 INFO L225 Difference]: With dead ends: 31 [2023-11-12 00:09:38,477 INFO L226 Difference]: Without dead ends: 31 [2023-11-12 00:09:38,477 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2023-11-12 00:09:38,478 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:38,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 98 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 140 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:09:38,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-12 00:09:38,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2023-11-12 00:09:38,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.65) internal successors, (33), 27 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) [2023-11-12 00:09:38,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2023-11-12 00:09:38,481 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 6 [2023-11-12 00:09:38,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:38,481 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2023-11-12 00:09:38,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:38,481 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2023-11-12 00:09:38,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:09:38,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:38,482 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:38,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:09:38,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:38,688 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:38,689 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:38,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1327565677, now seen corresponding path program 1 times [2023-11-12 00:09:38,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:38,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967074695] [2023-11-12 00:09:38,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:38,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:38,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:38,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:38,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:38,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967074695] [2023-11-12 00:09:38,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967074695] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:38,952 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:38,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:09:38,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057156535] [2023-11-12 00:09:38,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:38,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:09:38,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:38,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:09:38,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:09:38,954 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 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) [2023-11-12 00:09:39,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:39,147 INFO L93 Difference]: Finished difference Result 59 states and 70 transitions. [2023-11-12 00:09:39,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:09:39,148 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 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) Word has length 9 [2023-11-12 00:09:39,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:39,149 INFO L225 Difference]: With dead ends: 59 [2023-11-12 00:09:39,149 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 00:09:39,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:09:39,150 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 127 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:39,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 45 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:39,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 00:09:39,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 27. [2023-11-12 00:09:39,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 26 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) [2023-11-12 00:09:39,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2023-11-12 00:09:39,154 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 9 [2023-11-12 00:09:39,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:39,155 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2023-11-12 00:09:39,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 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) [2023-11-12 00:09:39,155 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2023-11-12 00:09:39,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:09:39,155 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:39,156 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:39,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-12 00:09:39,156 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:39,156 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:39,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1327565676, now seen corresponding path program 1 times [2023-11-12 00:09:39,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:39,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959642825] [2023-11-12 00:09:39,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:39,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:39,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:39,248 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:39,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:39,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959642825] [2023-11-12 00:09:39,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959642825] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:39,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:39,250 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:39,250 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710569683] [2023-11-12 00:09:39,250 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:39,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:09:39,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:39,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:09:39,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:09:39,251 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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) [2023-11-12 00:09:39,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:39,303 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2023-11-12 00:09:39,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:39,304 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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) Word has length 9 [2023-11-12 00:09:39,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:39,305 INFO L225 Difference]: With dead ends: 27 [2023-11-12 00:09:39,305 INFO L226 Difference]: Without dead ends: 27 [2023-11-12 00:09:39,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:39,306 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 28 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:39,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 19 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:09:39,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-12 00:09:39,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2023-11-12 00:09:39,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 21 states have (on average 1.380952380952381) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2023-11-12 00:09:39,309 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 9 [2023-11-12 00:09:39,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:39,309 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2023-11-12 00:09:39,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 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) [2023-11-12 00:09:39,310 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2023-11-12 00:09:39,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:09:39,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:39,311 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:39,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 00:09:39,311 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:39,312 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:39,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1795204963, now seen corresponding path program 1 times [2023-11-12 00:09:39,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:39,312 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747595911] [2023-11-12 00:09:39,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:39,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:39,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:39,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:39,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:39,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747595911] [2023-11-12 00:09:39,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747595911] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:39,515 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:39,515 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:39,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014770854] [2023-11-12 00:09:39,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:39,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:09:39,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:39,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:09:39,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:39,518 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:39,554 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2023-11-12 00:09:39,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:09:39,555 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:09:39,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:39,556 INFO L225 Difference]: With dead ends: 23 [2023-11-12 00:09:39,556 INFO L226 Difference]: Without dead ends: 20 [2023-11-12 00:09:39,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:09:39,557 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:39,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 24 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:09:39,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-12 00:09:39,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-12 00:09:39,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-12 00:09:39,562 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 10 [2023-11-12 00:09:39,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:39,562 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-12 00:09:39,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,563 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-12 00:09:39,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:09:39,564 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:39,564 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:39,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-12 00:09:39,565 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:39,567 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:39,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1451652080, now seen corresponding path program 1 times [2023-11-12 00:09:39,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:39,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707873986] [2023-11-12 00:09:39,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:39,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:39,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:39,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:39,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:39,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707873986] [2023-11-12 00:09:39,603 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707873986] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:39,604 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:39,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:09:39,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124056143] [2023-11-12 00:09:39,604 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:39,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:09:39,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:39,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:09:39,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:09:39,606 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:39,631 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-12 00:09:39,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:09:39,632 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:09:39,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:39,632 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:09:39,633 INFO L226 Difference]: Without dead ends: 21 [2023-11-12 00:09:39,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:09:39,634 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:39,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:09:39,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-12 00:09:39,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-12 00:09:39,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-12 00:09:39,641 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 12 [2023-11-12 00:09:39,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:39,642 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-12 00:09:39,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:39,642 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-12 00:09:39,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-12 00:09:39,643 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:39,643 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:39,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-12 00:09:39,644 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:39,644 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:39,644 INFO L85 PathProgramCache]: Analyzing trace with hash 2051394102, now seen corresponding path program 1 times [2023-11-12 00:09:39,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:39,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136727489] [2023-11-12 00:09:39,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:39,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:39,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:40,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:40,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:40,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136727489] [2023-11-12 00:09:40,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136727489] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:40,049 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:40,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-12 00:09:40,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587483031] [2023-11-12 00:09:40,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:40,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:09:40,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:40,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:09:40,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:09:40,052 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-11-12 00:09:40,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:40,196 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2023-11-12 00:09:40,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:09:40,196 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) Word has length 13 [2023-11-12 00:09:40,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:40,197 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:09:40,197 INFO L226 Difference]: Without dead ends: 23 [2023-11-12 00:09:40,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:09:40,198 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 8 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:40,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 52 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:40,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-12 00:09:40,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-11-12 00:09:40,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:40,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-11-12 00:09:40,201 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 13 [2023-11-12 00:09:40,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:40,201 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-11-12 00:09:40,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2023-11-12 00:09:40,202 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-11-12 00:09:40,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:09:40,202 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:40,203 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:40,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-12 00:09:40,203 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:40,203 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:40,204 INFO L85 PathProgramCache]: Analyzing trace with hash 745435777, now seen corresponding path program 1 times [2023-11-12 00:09:40,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:40,204 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439413858] [2023-11-12 00:09:40,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:40,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:40,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:40,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:40,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:40,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439413858] [2023-11-12 00:09:40,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1439413858] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:09:40,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:09:40,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-12 00:09:40,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210434114] [2023-11-12 00:09:40,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:09:40,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 00:09:40,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:40,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 00:09:40,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:09:40,461 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:40,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:40,602 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-11-12 00:09:40,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:09:40,602 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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 15 [2023-11-12 00:09:40,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:40,603 INFO L225 Difference]: With dead ends: 37 [2023-11-12 00:09:40,603 INFO L226 Difference]: Without dead ends: 37 [2023-11-12 00:09:40,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:09:40,606 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 58 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:40,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 36 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:40,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-12 00:09:40,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2023-11-12 00:09:40,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:40,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-11-12 00:09:40,610 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 15 [2023-11-12 00:09:40,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:40,610 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-11-12 00:09:40,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:40,610 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-11-12 00:09:40,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:09:40,612 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:40,612 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:40,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-12 00:09:40,613 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:40,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:40,613 INFO L85 PathProgramCache]: Analyzing trace with hash 1638206173, now seen corresponding path program 1 times [2023-11-12 00:09:40,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:40,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322371181] [2023-11-12 00:09:40,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:40,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:40,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:40,858 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:40,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:40,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322371181] [2023-11-12 00:09:40,859 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322371181] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:09:40,859 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [670104701] [2023-11-12 00:09:40,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:40,860 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:40,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:40,861 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:09:40,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:09:40,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:40,967 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-12 00:09:40,970 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:09:41,088 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:41,089 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:09:41,218 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-12 00:09:41,243 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:09:41,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [670104701] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:09:41,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817155646] [2023-11-12 00:09:41,248 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:09:41,248 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:09:41,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:09:41,249 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:09:41,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:09:44,638 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:09:48,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1275#(and (not (= |ULTIMATE.start_cstrcspn_~c~0#1| 0)) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~s~0#1.base|) 0) 0) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|)) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) 1) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| (select |#length| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|)) |ULTIMATE.start_cstrcspn_~c~0#1|) (= |ULTIMATE.start_cstrcspn_~s2#1.base| |ULTIMATE.start_cstrcspn_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~s~0#1.base|) 1))' at error location [2023-11-12 00:09:48,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:09:48,717 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:09:48,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2023-11-12 00:09:48,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408677765] [2023-11-12 00:09:48,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:09:48,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-12 00:09:48,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:48,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-12 00:09:48,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2023-11-12 00:09:48,720 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 17 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:48,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:48,941 INFO L93 Difference]: Finished difference Result 73 states and 83 transitions. [2023-11-12 00:09:48,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:09:48,943 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:09:48,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:48,943 INFO L225 Difference]: With dead ends: 73 [2023-11-12 00:09:48,943 INFO L226 Difference]: Without dead ends: 73 [2023-11-12 00:09:48,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 381 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=172, Invalid=1088, Unknown=0, NotChecked=0, Total=1260 [2023-11-12 00:09:48,946 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 205 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:48,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 62 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:09:48,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2023-11-12 00:09:48,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 53. [2023-11-12 00:09:48,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 51 states have (on average 1.2156862745098038) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:48,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2023-11-12 00:09:48,949 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 16 [2023-11-12 00:09:48,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:48,950 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2023-11-12 00:09:48,950 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.625) internal successors, (42), 16 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:48,950 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2023-11-12 00:09:48,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-12 00:09:48,951 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:48,951 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:48,958 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:09:49,158 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-12 00:09:49,158 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:49,159 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:49,159 INFO L85 PathProgramCache]: Analyzing trace with hash -1638425424, now seen corresponding path program 1 times [2023-11-12 00:09:49,159 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:49,159 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36519546] [2023-11-12 00:09:49,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:49,160 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:49,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:49,539 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:49,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:49,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36519546] [2023-11-12 00:09:49,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36519546] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:09:49,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286775009] [2023-11-12 00:09:49,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:49,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:49,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:49,542 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:09:49,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:09:49,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:49,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-12 00:09:49,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:09:49,752 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:49,753 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:09:49,871 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-12 00:09:49,897 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:49,898 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286775009] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:09:49,898 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1303320408] [2023-11-12 00:09:49,901 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:09:49,901 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:09:49,902 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:09:49,902 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:09:49,902 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:09:51,060 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:09:52,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1539#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|) |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s~0#1.base|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| 0))' at error location [2023-11-12 00:09:52,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:09:52,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:09:52,819 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2023-11-12 00:09:52,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404356071] [2023-11-12 00:09:52,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:09:52,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 00:09:52,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:52,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 00:09:52,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=873, Unknown=1, NotChecked=0, Total=992 [2023-11-12 00:09:52,821 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:53,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:53,230 INFO L93 Difference]: Finished difference Result 89 states and 105 transitions. [2023-11-12 00:09:53,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 00:09:53,231 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-12 00:09:53,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:53,232 INFO L225 Difference]: With dead ends: 89 [2023-11-12 00:09:53,232 INFO L226 Difference]: Without dead ends: 89 [2023-11-12 00:09:53,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=178, Invalid=1227, Unknown=1, NotChecked=0, Total=1406 [2023-11-12 00:09:53,233 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 118 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:53,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 66 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:09:53,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-12 00:09:53,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 61. [2023-11-12 00:09:53,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 60 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:53,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 74 transitions. [2023-11-12 00:09:53,236 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 74 transitions. Word has length 17 [2023-11-12 00:09:53,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:53,237 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 74 transitions. [2023-11-12 00:09:53,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:53,237 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 74 transitions. [2023-11-12 00:09:53,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:09:53,238 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:53,238 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:53,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:09:53,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-12 00:09:53,438 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:53,439 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:53,439 INFO L85 PathProgramCache]: Analyzing trace with hash 1031537145, now seen corresponding path program 2 times [2023-11-12 00:09:53,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:53,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924109863] [2023-11-12 00:09:53,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:53,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:53,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:54,146 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:54,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:54,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924109863] [2023-11-12 00:09:54,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924109863] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:09:54,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666607225] [2023-11-12 00:09:54,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:09:54,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:54,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:54,149 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:09:54,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:09:54,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:09:54,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:09:54,274 INFO L262 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-12 00:09:54,276 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:09:54,377 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 00:09:54,549 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:54,550 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:09:54,677 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2023-11-12 00:09:54,682 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2023-11-12 00:09:54,895 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:54,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666607225] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:09:54,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487270574] [2023-11-12 00:09:54,898 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:09:54,899 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:09:54,899 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:09:54,899 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:09:54,900 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:09:55,964 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:09:58,042 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1862#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|) |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s~0#1.base|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| 0))' at error location [2023-11-12 00:09:58,042 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:09:58,042 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:09:58,043 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 26 [2023-11-12 00:09:58,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926337104] [2023-11-12 00:09:58,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:09:58,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-12 00:09:58,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:09:58,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-12 00:09:58,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1455, Unknown=1, NotChecked=0, Total=1640 [2023-11-12 00:09:58,045 INFO L87 Difference]: Start difference. First operand 61 states and 74 transitions. Second operand has 27 states, 27 states have (on average 1.8518518518518519) internal successors, (50), 26 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:58,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:09:58,562 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2023-11-12 00:09:58,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:09:58,562 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8518518518518519) internal successors, (50), 26 states have internal predecessors, (50), 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 21 [2023-11-12 00:09:58,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:09:58,563 INFO L225 Difference]: With dead ends: 102 [2023-11-12 00:09:58,564 INFO L226 Difference]: Without dead ends: 102 [2023-11-12 00:09:58,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 31 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=316, Invalid=2133, Unknown=1, NotChecked=0, Total=2450 [2023-11-12 00:09:58,568 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 212 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:09:58,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 116 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:09:58,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-12 00:09:58,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 90. [2023-11-12 00:09:58,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 88 states have (on average 1.2386363636363635) internal successors, (109), 89 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:58,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 109 transitions. [2023-11-12 00:09:58,574 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 109 transitions. Word has length 21 [2023-11-12 00:09:58,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:09:58,574 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 109 transitions. [2023-11-12 00:09:58,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8518518518518519) internal successors, (50), 26 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:09:58,575 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 109 transitions. [2023-11-12 00:09:58,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-12 00:09:58,576 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:09:58,577 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:09:58,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:09:58,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-12 00:09:58,790 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:09:58,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:09:58,791 INFO L85 PathProgramCache]: Analyzing trace with hash 1487047912, now seen corresponding path program 3 times [2023-11-12 00:09:58,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:09:58,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95919587] [2023-11-12 00:09:58,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:09:58,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:09:58,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:09:59,226 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:59,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:09:59,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95919587] [2023-11-12 00:09:59,227 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95919587] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:09:59,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613050223] [2023-11-12 00:09:59,227 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:09:59,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:09:59,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:09:59,229 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:09:59,248 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:09:59,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:09:59,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:09:59,369 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-12 00:09:59,371 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:09:59,382 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-12 00:09:59,530 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:59,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:09:59,789 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:09:59,790 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613050223] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:09:59,790 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [896180053] [2023-11-12 00:09:59,792 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:09:59,792 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:09:59,792 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:09:59,793 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:09:59,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:10:00,885 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:10:02,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2242#(and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (<= 0 |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|) |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| 0))' at error location [2023-11-12 00:10:02,322 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:10:02,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:10:02,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2023-11-12 00:10:02,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585950460] [2023-11-12 00:10:02,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:10:02,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-12 00:10:02,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:10:02,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-12 00:10:02,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1267, Unknown=1, NotChecked=0, Total=1406 [2023-11-12 00:10:02,325 INFO L87 Difference]: Start difference. First operand 90 states and 109 transitions. Second operand has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:02,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:10:02,860 INFO L93 Difference]: Finished difference Result 135 states and 161 transitions. [2023-11-12 00:10:02,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-12 00:10:02,861 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-12 00:10:02,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:10:02,863 INFO L225 Difference]: With dead ends: 135 [2023-11-12 00:10:02,863 INFO L226 Difference]: Without dead ends: 135 [2023-11-12 00:10:02,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=222, Invalid=1757, Unknown=1, NotChecked=0, Total=1980 [2023-11-12 00:10:02,866 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 188 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 454 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:10:02,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 102 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 454 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:10:02,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-12 00:10:02,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 98. [2023-11-12 00:10:02,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 96 states have (on average 1.2604166666666667) internal successors, (121), 97 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:02,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 121 transitions. [2023-11-12 00:10:02,880 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 121 transitions. Word has length 23 [2023-11-12 00:10:02,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:10:02,880 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 121 transitions. [2023-11-12 00:10:02,880 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:02,880 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 121 transitions. [2023-11-12 00:10:02,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:10:02,885 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:10:02,886 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:10:02,893 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:10:03,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:10:03,097 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:10:03,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:10:03,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1270621450, now seen corresponding path program 2 times [2023-11-12 00:10:03,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:10:03,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641173106] [2023-11-12 00:10:03,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:10:03,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:10:03,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:10:03,470 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:03,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:10:03,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641173106] [2023-11-12 00:10:03,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641173106] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:10:03,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590099634] [2023-11-12 00:10:03,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:10:03,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:10:03,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:10:03,472 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:10:03,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:10:03,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:10:03,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:10:03,602 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-12 00:10:03,604 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:10:03,611 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 00:10:03,702 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-12 00:10:03,727 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:10:03,790 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:03,791 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:10:03,825 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_230 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_230) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)) 0)) is different from false [2023-11-12 00:10:03,833 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:10:03,833 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-11-12 00:10:03,841 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:10:03,842 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-11-12 00:10:03,923 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:03,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590099634] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:10:03,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037016797] [2023-11-12 00:10:03,926 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:10:03,926 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:10:03,927 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:10:03,927 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:10:03,927 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:10:06,411 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:10:10,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2662#(and (not (= |ULTIMATE.start_cstrcspn_~c~0#1| 0)) (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~s~0#1.base|) 0) 0) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 1 (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|)) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) 1) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| (select |#length| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|)) |ULTIMATE.start_cstrcspn_~c~0#1|) (= |ULTIMATE.start_cstrcspn_~s2#1.base| |ULTIMATE.start_cstrcspn_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~s~0#1.base|) 1))' at error location [2023-11-12 00:10:10,366 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:10:10,366 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:10:10,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 20 [2023-11-12 00:10:10,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027670912] [2023-11-12 00:10:10,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:10:10,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-12 00:10:10,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:10:10,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-12 00:10:10,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1000, Unknown=1, NotChecked=64, Total=1190 [2023-11-12 00:10:10,369 INFO L87 Difference]: Start difference. First operand 98 states and 121 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:10,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:10:10,695 INFO L93 Difference]: Finished difference Result 158 states and 190 transitions. [2023-11-12 00:10:10,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:10:10,695 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 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 24 [2023-11-12 00:10:10,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:10:10,697 INFO L225 Difference]: With dead ends: 158 [2023-11-12 00:10:10,697 INFO L226 Difference]: Without dead ends: 125 [2023-11-12 00:10:10,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=179, Invalid=1306, Unknown=1, NotChecked=74, Total=1560 [2023-11-12 00:10:10,698 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 111 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 35 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:10:10,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 93 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 169 Invalid, 0 Unknown, 35 Unchecked, 0.2s Time] [2023-11-12 00:10:10,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-12 00:10:10,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2023-11-12 00:10:10,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 121 states have (on average 1.2314049586776858) internal successors, (149), 122 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:10,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 149 transitions. [2023-11-12 00:10:10,704 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 149 transitions. Word has length 24 [2023-11-12 00:10:10,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:10:10,705 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 149 transitions. [2023-11-12 00:10:10,705 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:10:10,705 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 149 transitions. [2023-11-12 00:10:10,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-12 00:10:10,706 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:10:10,706 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:10:10,712 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:10:10,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:10:10,909 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-11-12 00:10:10,909 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:10:10,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1856873931, now seen corresponding path program 3 times [2023-11-12 00:10:10,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:10:10,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966579878] [2023-11-12 00:10:10,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:10:10,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:10:10,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:10:11,246 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:11,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:10:11,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966579878] [2023-11-12 00:10:11,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966579878] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:10:11,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649236425] [2023-11-12 00:10:11,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:10:11,247 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:10:11,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:10:11,248 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:10:11,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3ae10543-5407-452c-a0e8-13e76467e981/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:10:11,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:10:11,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:10:11,376 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-12 00:10:11,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:10:11,513 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:11,513 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:10:11,672 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-12 00:10:11,710 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:10:11,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649236425] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:10:11,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107198322] [2023-11-12 00:10:11,713 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:10:11,713 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:10:11,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:10:11,714 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:10:11,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:10:13,634 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:10:16,499 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3136#(and (not (= |ULTIMATE.start_cstrcspn_~c~0#1| 0)) (exists ((|v_ULTIMATE.start_cstrcspn_~s~0#1.offset_56| Int)) (and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (or (and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (= |ULTIMATE.start_main_~length2~0#1| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (= |v_ULTIMATE.start_cstrcspn_~s~0#1.offset_56| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0)) (and (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (= |ULTIMATE.start_main_~length2~0#1| 1) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| 1) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0))) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|))) (= |ULTIMATE.start_cstrcspn_~s~0#1.offset| |ULTIMATE.start_cstrcspn_~s2#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) 1) (<= (+ |ULTIMATE.start_cstrcspn_~s~0#1.offset| 1) (select |#length| |ULTIMATE.start_cstrcspn_~s~0#1.base|)) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~s~0#1.base|) |ULTIMATE.start_cstrcspn_~s~0#1.offset|) 0) (<= (select |#length| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| (select |#length| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|)) (or (and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_#in~s1#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s2#1.offset| 0) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 2 |ULTIMATE.start_cstrcspn_#in~s2#1.base|) (<= 2 |ULTIMATE.start_cstrcspn_~s1#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_cstrcspn_~s1#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s2#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (= |ULTIMATE.start_cstrcspn_#in~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrcspn_~s2#1.base|) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_cstrcspn_~sc1~0#1.offset| 0)) (and (<= 0 |ULTIMATE.start_cstrcspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrcspn_~s2#1.offset|) (<= 1 |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|))) (= (select (select |#memory_int| |ULTIMATE.start_cstrcspn_~sc1~0#1.base|) (+ (- 1) |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|)) |ULTIMATE.start_cstrcspn_~c~0#1|) (= |ULTIMATE.start_cstrcspn_~s2#1.base| |ULTIMATE.start_cstrcspn_~s~0#1.base|) (<= 1 |ULTIMATE.start_cstrcspn_~sc1~0#1.offset|) (= (select |#valid| |ULTIMATE.start_cstrcspn_~s~0#1.base|) 1))' at error location [2023-11-12 00:10:16,499 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:10:16,499 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:10:16,499 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-11-12 00:10:16,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986649801] [2023-11-12 00:10:16,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:10:16,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-12 00:10:16,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:10:16,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-12 00:10:16,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=931, Unknown=0, NotChecked=0, Total=1056 [2023-11-12 00:10:16,502 INFO L87 Difference]: Start difference. First operand 123 states and 149 transitions. Second operand has 19 states, 18 states have (on average 3.0) internal successors, (54), 18 states have internal predecessors, (54), 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)