./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh --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 d8697c629a22dee8b5a51c26261db89d3e1115a5e0c1bc03fd54c09ffc3b9b0d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:58:09,236 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:58:09,310 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-12-02 19:58:09,316 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:58:09,317 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:58:09,345 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:58:09,345 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:58:09,345 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:58:09,346 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:58:09,347 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:58:09,347 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:58:09,348 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:58:09,349 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:58:09,349 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:58:09,350 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:58:09,350 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:58:09,351 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:58:09,351 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:58:09,352 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:58:09,353 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:58:09,353 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:58:09,354 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:58:09,355 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 19:58:09,355 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 19:58:09,356 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:58:09,357 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:58:09,357 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:58:09,358 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:58:09,358 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:58:09,359 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 19:58:09,359 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 19:58:09,360 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 19:58:09,360 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:58:09,360 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 19:58:09,360 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 19:58:09,361 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:58:09,361 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:58:09,361 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:58:09,361 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:58:09,361 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:58:09,362 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:58:09,362 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:58:09,362 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:58:09,362 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:58:09,363 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:58:09,363 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:58:09,363 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:58:09,363 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:58:09,363 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_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d8697c629a22dee8b5a51c26261db89d3e1115a5e0c1bc03fd54c09ffc3b9b0d [2023-12-02 19:58:09,586 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:58:09,609 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:58:09,612 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:58:09,613 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:58:09,613 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:58:09,615 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i [2023-12-02 19:58:12,547 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:58:12,797 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:58:12,798 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/sv-benchmarks/c/array-memsafety/cstrncat-alloca-2.i [2023-12-02 19:58:12,812 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/data/31d30afba/aebb939871f84ef4a345f5238e7735cb/FLAGa9be3f83e [2023-12-02 19:58:12,826 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/data/31d30afba/aebb939871f84ef4a345f5238e7735cb [2023-12-02 19:58:12,828 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:58:12,830 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:58:12,831 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:58:12,831 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:58:12,836 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:58:12,836 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:58:12" (1/1) ... [2023-12-02 19:58:12,838 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@442bc8a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:12, skipping insertion in model container [2023-12-02 19:58:12,838 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:58:12" (1/1) ... [2023-12-02 19:58:12,889 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:58:13,154 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:58:13,168 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:58:13,210 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:58:13,244 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:58:13,245 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13 WrapperNode [2023-12-02 19:58:13,245 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:58:13,246 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:58:13,246 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:58:13,247 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:58:13,256 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,272 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,302 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 113 [2023-12-02 19:58:13,302 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:58:13,303 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:58:13,303 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:58:13,304 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:58:13,314 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,314 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,318 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,318 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,325 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,329 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,330 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,331 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,335 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:58:13,336 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:58:13,336 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:58:13,336 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:58:13,337 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (1/1) ... [2023-12-02 19:58:13,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:58:13,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:13,375 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:58:13,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:58:13,416 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 19:58:13,417 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 19:58:13,417 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 19:58:13,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 19:58:13,417 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:58:13,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:58:13,532 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:58:13,535 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:58:13,765 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:58:13,829 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:58:13,829 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-12-02 19:58:13,831 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:58:13 BoogieIcfgContainer [2023-12-02 19:58:13,831 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:58:13,834 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:58:13,834 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:58:13,837 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:58:13,837 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:58:12" (1/3) ... [2023-12-02 19:58:13,837 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58dff00e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:58:13, skipping insertion in model container [2023-12-02 19:58:13,838 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:58:13" (2/3) ... [2023-12-02 19:58:13,838 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58dff00e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:58:13, skipping insertion in model container [2023-12-02 19:58:13,838 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:58:13" (3/3) ... [2023-12-02 19:58:13,839 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrncat-alloca-2.i [2023-12-02 19:58:13,855 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:58:13,856 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2023-12-02 19:58:13,900 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:58:13,906 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;@7135cd0c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:58:13,906 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2023-12-02 19:58:13,910 INFO L276 IsEmpty]: Start isEmpty. Operand has 40 states, 20 states have (on average 2.4) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:13,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-12-02 19:58:13,916 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:13,917 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-12-02 19:58:13,917 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:13,922 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:13,922 INFO L85 PathProgramCache]: Analyzing trace with hash 170935, now seen corresponding path program 1 times [2023-12-02 19:58:13,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:13,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093919315] [2023-12-02 19:58:13,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:13,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:14,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:14,127 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:14,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:14,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093919315] [2023-12-02 19:58:14,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093919315] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:14,129 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:14,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-12-02 19:58:14,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302526184] [2023-12-02 19:58:14,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:14,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:58:14,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:14,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:58:14,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:58:14,177 INFO L87 Difference]: Start difference. First operand has 40 states, 20 states have (on average 2.4) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 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) [2023-12-02 19:58:14,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:14,253 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2023-12-02 19:58:14,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:58:14,256 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 [2023-12-02 19:58:14,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:14,265 INFO L225 Difference]: With dead ends: 41 [2023-12-02 19:58:14,266 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 19:58:14,268 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 [2023-12-02 19:58:14,272 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 1 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:14,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 56 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:14,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 19:58:14,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-12-02 19:58:14,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 20 states have (on average 2.2) internal successors, (44), 38 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:14,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2023-12-02 19:58:14,330 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 3 [2023-12-02 19:58:14,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:14,330 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2023-12-02 19:58:14,330 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) [2023-12-02 19:58:14,331 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2023-12-02 19:58:14,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 19:58:14,331 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:14,331 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 19:58:14,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:58:14,332 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:14,333 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:14,333 INFO L85 PathProgramCache]: Analyzing trace with hash 5298090, now seen corresponding path program 1 times [2023-12-02 19:58:14,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:14,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821232732] [2023-12-02 19:58:14,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:14,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:14,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:14,542 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:14,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:14,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821232732] [2023-12-02 19:58:14,544 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821232732] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:14,544 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:14,544 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:58:14,544 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170648404] [2023-12-02 19:58:14,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:14,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:58:14,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:14,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:58:14,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:58:14,547 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.0) 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) [2023-12-02 19:58:14,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:14,595 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-12-02 19:58:14,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:58:14,596 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) 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 [2023-12-02 19:58:14,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:14,597 INFO L225 Difference]: With dead ends: 37 [2023-12-02 19:58:14,597 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 19:58:14,597 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:58:14,599 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:14,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 20 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:14,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 19:58:14,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-12-02 19:58:14,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 2.1) internal successors, (42), 36 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) [2023-12-02 19:58:14,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2023-12-02 19:58:14,606 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 4 [2023-12-02 19:58:14,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:14,607 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2023-12-02 19:58:14,607 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) 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) [2023-12-02 19:58:14,607 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2023-12-02 19:58:14,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 19:58:14,608 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:14,608 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 19:58:14,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 19:58:14,608 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:14,609 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:14,609 INFO L85 PathProgramCache]: Analyzing trace with hash 5298091, now seen corresponding path program 1 times [2023-12-02 19:58:14,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:14,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219856751] [2023-12-02 19:58:14,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:14,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:14,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:14,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:14,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:14,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219856751] [2023-12-02 19:58:14,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219856751] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:14,995 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:14,995 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:58:14,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081286842] [2023-12-02 19:58:14,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:14,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:14,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:14,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:14,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:14,997 INFO L87 Difference]: Start difference. First operand 37 states and 42 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) [2023-12-02 19:58:15,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:15,168 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2023-12-02 19:58:15,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:58:15,168 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 [2023-12-02 19:58:15,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:15,169 INFO L225 Difference]: With dead ends: 39 [2023-12-02 19:58:15,170 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 19:58:15,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:58:15,172 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 45 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:15,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 66 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:15,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 19:58:15,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-12-02 19:58:15,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 38 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:15,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2023-12-02 19:58:15,179 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 4 [2023-12-02 19:58:15,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:15,180 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2023-12-02 19:58:15,180 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) [2023-12-02 19:58:15,180 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2023-12-02 19:58:15,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 19:58:15,181 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:15,181 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 19:58:15,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 19:58:15,181 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)] === [2023-12-02 19:58:15,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:15,182 INFO L85 PathProgramCache]: Analyzing trace with hash 164343205, now seen corresponding path program 1 times [2023-12-02 19:58:15,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:15,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591714386] [2023-12-02 19:58:15,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:15,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:15,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:15,230 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:15,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:15,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591714386] [2023-12-02 19:58:15,231 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591714386] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:15,232 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:15,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:58:15,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069712955] [2023-12-02 19:58:15,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:15,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:58:15,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:15,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:58:15,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:58:15,234 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 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) [2023-12-02 19:58:15,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:15,291 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2023-12-02 19:58:15,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:58:15,292 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 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 [2023-12-02 19:58:15,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:15,293 INFO L225 Difference]: With dead ends: 37 [2023-12-02 19:58:15,293 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 19:58:15,294 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:58:15,295 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 34 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:15,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:15,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 19:58:15,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-12-02 19:58:15,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:15,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2023-12-02 19:58:15,301 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 5 [2023-12-02 19:58:15,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:15,302 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2023-12-02 19:58:15,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 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) [2023-12-02 19:58:15,302 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2023-12-02 19:58:15,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 19:58:15,303 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:15,303 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 19:58:15,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 19:58:15,303 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)] === [2023-12-02 19:58:15,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:15,304 INFO L85 PathProgramCache]: Analyzing trace with hash 164343206, now seen corresponding path program 1 times [2023-12-02 19:58:15,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:15,304 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538612302] [2023-12-02 19:58:15,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:15,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:15,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:15,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:15,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:15,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538612302] [2023-12-02 19:58:15,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538612302] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:15,391 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:15,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:58:15,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801725402] [2023-12-02 19:58:15,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:15,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:58:15,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:15,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:58:15,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:15,393 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 4 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) [2023-12-02 19:58:15,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:15,443 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2023-12-02 19:58:15,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:58:15,444 INFO L78 Accepts]: Start accepts. Automaton has has 4 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 [2023-12-02 19:58:15,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:15,444 INFO L225 Difference]: With dead ends: 38 [2023-12-02 19:58:15,445 INFO L226 Difference]: Without dead ends: 38 [2023-12-02 19:58:15,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:15,446 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 1 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:15,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 83 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:15,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-12-02 19:58:15,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-12-02 19:58:15,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:15,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2023-12-02 19:58:15,453 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 5 [2023-12-02 19:58:15,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:15,453 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2023-12-02 19:58:15,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 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) [2023-12-02 19:58:15,453 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2023-12-02 19:58:15,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-12-02 19:58:15,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:15,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-12-02 19:58:15,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-12-02 19:58:15,455 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:15,455 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:15,455 INFO L85 PathProgramCache]: Analyzing trace with hash 164346068, now seen corresponding path program 1 times [2023-12-02 19:58:15,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:15,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135062181] [2023-12-02 19:58:15,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:15,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:15,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:15,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:15,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:15,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135062181] [2023-12-02 19:58:15,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1135062181] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:15,798 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:15,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:58:15,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633740344] [2023-12-02 19:58:15,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:15,799 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:15,799 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:15,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:15,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:15,800 INFO L87 Difference]: Start difference. First operand 38 states and 44 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) [2023-12-02 19:58:15,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:15,882 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2023-12-02 19:58:15,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:58:15,885 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 [2023-12-02 19:58:15,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:15,885 INFO L225 Difference]: With dead ends: 37 [2023-12-02 19:58:15,886 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 19:58:15,886 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:58:15,887 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 74 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:15,887 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 15 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:15,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 19:58:15,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-12-02 19:58:15,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:15,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2023-12-02 19:58:15,891 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 5 [2023-12-02 19:58:15,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:15,891 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2023-12-02 19:58:15,891 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) [2023-12-02 19:58:15,891 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2023-12-02 19:58:15,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 19:58:15,892 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:15,892 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-12-02 19:58:15,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-12-02 19:58:15,892 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:15,893 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:15,893 INFO L85 PathProgramCache]: Analyzing trace with hash 796594353, now seen corresponding path program 1 times [2023-12-02 19:58:15,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:15,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994486802] [2023-12-02 19:58:15,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:15,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:15,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:16,252 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:16,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:16,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994486802] [2023-12-02 19:58:16,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994486802] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:16,253 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238072406] [2023-12-02 19:58:16,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:16,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:16,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:16,256 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:16,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:58:16,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:16,357 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 19:58:16,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:16,516 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 19:58:16,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 19:58:16,527 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 19:58:16,725 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:16,726 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:16,918 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 19:58:16,948 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:16,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238072406] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:16,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2101414495] [2023-12-02 19:58:16,971 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-12-02 19:58:16,971 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:16,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:16,982 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:16,983 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:18,215 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:18,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '572#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet16#1|)) (<= |ULTIMATE.start_main_#t~nondet16#1| 127) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0))' at error location [2023-12-02 19:58:18,561 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:18,562 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:18,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2023-12-02 19:58:18,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873485955] [2023-12-02 19:58:18,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:18,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 19:58:18,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:18,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 19:58:18,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2023-12-02 19:58:18,564 INFO L87 Difference]: Start difference. First operand 37 states and 43 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) [2023-12-02 19:58:18,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:18,806 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2023-12-02 19:58:18,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 19:58:18,806 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 [2023-12-02 19:58:18,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:18,807 INFO L225 Difference]: With dead ends: 37 [2023-12-02 19:58:18,807 INFO L226 Difference]: Without dead ends: 37 [2023-12-02 19:58:18,808 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=323, Unknown=0, NotChecked=0, Total=420 [2023-12-02 19:58:18,808 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 37 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:18,809 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 75 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:18,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-12-02 19:58:18,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2023-12-02 19:58:18,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 34 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) [2023-12-02 19:58:18,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2023-12-02 19:58:18,813 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 6 [2023-12-02 19:58:18,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:18,814 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2023-12-02 19:58:18,814 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) [2023-12-02 19:58:18,814 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2023-12-02 19:58:18,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 19:58:18,815 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:18,815 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 19:58:18,822 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:58:19,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:19,017 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:19,017 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:19,018 INFO L85 PathProgramCache]: Analyzing trace with hash 799760817, now seen corresponding path program 1 times [2023-12-02 19:58:19,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:19,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808093048] [2023-12-02 19:58:19,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:19,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:19,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:19,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:19,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:19,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808093048] [2023-12-02 19:58:19,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808093048] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:19,196 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:19,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:58:19,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273322201] [2023-12-02 19:58:19,197 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:19,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:19,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:19,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:19,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:19,198 INFO L87 Difference]: Start difference. First operand 35 states and 41 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) [2023-12-02 19:58:19,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:19,298 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2023-12-02 19:58:19,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:58:19,299 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 [2023-12-02 19:58:19,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:19,300 INFO L225 Difference]: With dead ends: 61 [2023-12-02 19:58:19,300 INFO L226 Difference]: Without dead ends: 61 [2023-12-02 19:58:19,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:58:19,301 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 94 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:19,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 31 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:19,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-12-02 19:58:19,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 37. [2023-12-02 19:58:19,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:19,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2023-12-02 19:58:19,306 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 6 [2023-12-02 19:58:19,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:19,306 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2023-12-02 19:58:19,306 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) [2023-12-02 19:58:19,307 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2023-12-02 19:58:19,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:58:19,307 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:19,307 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:19,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 19:58:19,308 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)] === [2023-12-02 19:58:19,308 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:19,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1075276448, now seen corresponding path program 1 times [2023-12-02 19:58:19,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:19,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263757260] [2023-12-02 19:58:19,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:19,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:19,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:19,563 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:19,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:19,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263757260] [2023-12-02 19:58:19,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263757260] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:19,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437934989] [2023-12-02 19:58:19,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:19,564 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:19,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:19,566 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:19,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:58:19,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:19,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 19:58:19,649 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:19,687 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-12-02 19:58:19,700 INFO L378 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 [2023-12-02 19:58:19,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:58:19,860 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:58:19,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437934989] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:19,861 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:58:19,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 9 [2023-12-02 19:58:19,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227657867] [2023-12-02 19:58:19,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:19,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 19:58:19,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:19,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 19:58:19,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:58:19,863 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:19,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:19,979 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2023-12-02 19:58:19,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:58:19,980 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 19:58:19,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:19,980 INFO L225 Difference]: With dead ends: 35 [2023-12-02 19:58:19,980 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 19:58:19,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2023-12-02 19:58:19,981 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:19,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 48 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:19,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 19:58:19,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2023-12-02 19:58:19,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 22 states have (on average 1.7727272727272727) 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) [2023-12-02 19:58:19,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2023-12-02 19:58:19,985 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 7 [2023-12-02 19:58:19,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:19,985 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2023-12-02 19:58:19,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:19,986 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2023-12-02 19:58:19,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:58:19,986 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:19,986 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:19,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:58:20,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 19:58:20,187 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:20,187 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:20,187 INFO L85 PathProgramCache]: Analyzing trace with hash -977216236, now seen corresponding path program 1 times [2023-12-02 19:58:20,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:20,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613269394] [2023-12-02 19:58:20,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:20,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:20,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:20,245 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:20,246 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:20,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613269394] [2023-12-02 19:58:20,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613269394] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:20,246 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:20,246 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:58:20,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516861584] [2023-12-02 19:58:20,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:20,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:58:20,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:20,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:58:20,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:20,247 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:20,291 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2023-12-02 19:58:20,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:58:20,292 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 19:58:20,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:20,292 INFO L225 Difference]: With dead ends: 29 [2023-12-02 19:58:20,292 INFO L226 Difference]: Without dead ends: 29 [2023-12-02 19:58:20,293 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 [2023-12-02 19:58:20,293 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:20,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 14 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:20,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-12-02 19:58:20,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-12-02 19:58:20,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-12-02 19:58:20,296 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 7 [2023-12-02 19:58:20,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:20,296 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-12-02 19:58:20,296 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,297 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-12-02 19:58:20,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 19:58:20,297 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:20,297 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:20,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-12-02 19:58:20,297 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:20,298 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:20,298 INFO L85 PathProgramCache]: Analyzing trace with hash -977216235, now seen corresponding path program 1 times [2023-12-02 19:58:20,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:20,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716135479] [2023-12-02 19:58:20,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:20,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:20,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:20,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:20,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:20,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716135479] [2023-12-02 19:58:20,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716135479] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:20,403 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:20,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:58:20,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897592233] [2023-12-02 19:58:20,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:20,404 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:20,404 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:20,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:20,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:20,405 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:20,496 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2023-12-02 19:58:20,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:58:20,496 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 19:58:20,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:20,497 INFO L225 Difference]: With dead ends: 44 [2023-12-02 19:58:20,497 INFO L226 Difference]: Without dead ends: 44 [2023-12-02 19:58:20,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:58:20,498 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 103 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:20,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 26 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:20,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-12-02 19:58:20,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 39. [2023-12-02 19:58:20,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 32 states have (on average 1.59375) internal successors, (51), 38 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 51 transitions. [2023-12-02 19:58:20,503 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 51 transitions. Word has length 7 [2023-12-02 19:58:20,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:20,503 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 51 transitions. [2023-12-02 19:58:20,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:20,503 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 51 transitions. [2023-12-02 19:58:20,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 19:58:20,504 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:20,504 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:20,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-12-02 19:58:20,504 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:20,505 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:20,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1493036622, now seen corresponding path program 1 times [2023-12-02 19:58:20,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:20,505 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919045376] [2023-12-02 19:58:20,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:20,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:20,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:21,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:21,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:21,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919045376] [2023-12-02 19:58:21,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919045376] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:21,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108263203] [2023-12-02 19:58:21,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:21,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:21,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:21,141 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:21,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:58:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:21,229 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 19:58:21,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:21,237 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:21,304 INFO L378 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 17 treesize of output 13 [2023-12-02 19:58:21,376 INFO L378 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 22 treesize of output 17 [2023-12-02 19:58:21,432 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 19:58:21,434 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:21,435 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 10 [2023-12-02 19:58:21,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:21,455 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:58:21,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108263203] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:21,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:58:21,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 13 [2023-12-02 19:58:21,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782552335] [2023-12-02 19:58:21,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:21,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 19:58:21,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:21,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 19:58:21,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2023-12-02 19:58:21,457 INFO L87 Difference]: Start difference. First operand 39 states and 51 transitions. Second operand has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 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) [2023-12-02 19:58:21,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:21,749 INFO L93 Difference]: Finished difference Result 91 states and 112 transitions. [2023-12-02 19:58:21,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 19:58:21,750 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 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 [2023-12-02 19:58:21,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:21,752 INFO L225 Difference]: With dead ends: 91 [2023-12-02 19:58:21,752 INFO L226 Difference]: Without dead ends: 91 [2023-12-02 19:58:21,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2023-12-02 19:58:21,753 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 90 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:21,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 120 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:58:21,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-12-02 19:58:21,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 43. [2023-12-02 19:58:21,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 36 states have (on average 1.5277777777777777) internal successors, (55), 42 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:21,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 55 transitions. [2023-12-02 19:58:21,759 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 55 transitions. Word has length 9 [2023-12-02 19:58:21,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:21,760 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 55 transitions. [2023-12-02 19:58:21,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 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) [2023-12-02 19:58:21,760 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 55 transitions. [2023-12-02 19:58:21,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:58:21,761 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:21,761 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:21,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 19:58:21,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 19:58:21,965 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:21,965 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:21,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1653369096, now seen corresponding path program 1 times [2023-12-02 19:58:21,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:21,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929354575] [2023-12-02 19:58:21,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:21,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:21,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:22,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:22,153 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:22,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929354575] [2023-12-02 19:58:22,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929354575] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:22,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251278963] [2023-12-02 19:58:22,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:22,154 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:22,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:22,156 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:22,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:58:22,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:22,244 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 20 conjunts are in the unsatisfiable core [2023-12-02 19:58:22,246 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:22,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:22,334 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:22,431 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-12-02 19:58:22,459 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:22,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251278963] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:22,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764217042] [2023-12-02 19:58:22,462 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:58:22,462 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:22,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:22,463 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:22,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:23,497 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:24,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1265#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:24,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:24,132 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:24,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2023-12-02 19:58:24,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444678746] [2023-12-02 19:58:24,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:24,133 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 19:58:24,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:24,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 19:58:24,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2023-12-02 19:58:24,135 INFO L87 Difference]: Start difference. First operand 43 states and 55 transitions. Second operand has 17 states, 16 states have (on average 1.5625) internal successors, (25), 17 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) [2023-12-02 19:58:24,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:24,422 INFO L93 Difference]: Finished difference Result 94 states and 116 transitions. [2023-12-02 19:58:24,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 19:58:24,425 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.5625) internal successors, (25), 17 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) Word has length 11 [2023-12-02 19:58:24,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:24,426 INFO L225 Difference]: With dead ends: 94 [2023-12-02 19:58:24,426 INFO L226 Difference]: Without dead ends: 94 [2023-12-02 19:58:24,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=129, Invalid=801, Unknown=0, NotChecked=0, Total=930 [2023-12-02 19:58:24,428 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 336 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:24,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 167 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 270 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:58:24,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-12-02 19:58:24,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 46. [2023-12-02 19:58:24,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 40 states have (on average 1.525) internal successors, (61), 45 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) [2023-12-02 19:58:24,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 61 transitions. [2023-12-02 19:58:24,432 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 61 transitions. Word has length 11 [2023-12-02 19:58:24,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:24,432 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 61 transitions. [2023-12-02 19:58:24,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.5625) internal successors, (25), 17 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) [2023-12-02 19:58:24,433 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 61 transitions. [2023-12-02 19:58:24,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:58:24,433 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:24,434 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:24,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 19:58:24,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:24,634 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:24,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:24,635 INFO L85 PathProgramCache]: Analyzing trace with hash 289071710, now seen corresponding path program 1 times [2023-12-02 19:58:24,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:24,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138153563] [2023-12-02 19:58:24,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:24,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:24,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:24,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:24,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:24,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138153563] [2023-12-02 19:58:24,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138153563] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:24,704 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:24,704 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 19:58:24,705 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957394428] [2023-12-02 19:58:24,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:24,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:58:24,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:24,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:58:24,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:24,706 INFO L87 Difference]: Start difference. First operand 46 states and 61 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:24,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:24,756 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2023-12-02 19:58:24,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:58:24,756 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 19:58:24,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:24,757 INFO L225 Difference]: With dead ends: 47 [2023-12-02 19:58:24,757 INFO L226 Difference]: Without dead ends: 47 [2023-12-02 19:58:24,758 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 [2023-12-02 19:58:24,758 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:24,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 30 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:24,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-12-02 19:58:24,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 45. [2023-12-02 19:58:24,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.45) internal successors, (58), 44 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:24,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 58 transitions. [2023-12-02 19:58:24,763 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 58 transitions. Word has length 11 [2023-12-02 19:58:24,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:24,763 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 58 transitions. [2023-12-02 19:58:24,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:24,764 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 58 transitions. [2023-12-02 19:58:24,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:58:24,765 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:24,765 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:24,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-12-02 19:58:24,765 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:24,766 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:24,766 INFO L85 PathProgramCache]: Analyzing trace with hash 289071711, now seen corresponding path program 1 times [2023-12-02 19:58:24,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:24,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563022488] [2023-12-02 19:58:24,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:24,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:24,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:24,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:24,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:24,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563022488] [2023-12-02 19:58:24,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563022488] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:24,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:24,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:58:24,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884019048] [2023-12-02 19:58:24,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:24,931 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:24,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:24,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:24,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:24,931 INFO L87 Difference]: Start difference. First operand 45 states and 58 transitions. Second operand has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:25,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:25,027 INFO L93 Difference]: Finished difference Result 64 states and 83 transitions. [2023-12-02 19:58:25,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:58:25,027 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 19:58:25,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:25,028 INFO L225 Difference]: With dead ends: 64 [2023-12-02 19:58:25,028 INFO L226 Difference]: Without dead ends: 64 [2023-12-02 19:58:25,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-12-02 19:58:25,029 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 54 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:25,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 29 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:25,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-12-02 19:58:25,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 54. [2023-12-02 19:58:25,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 53 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:25,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 71 transitions. [2023-12-02 19:58:25,034 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 71 transitions. Word has length 11 [2023-12-02 19:58:25,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:25,034 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 71 transitions. [2023-12-02 19:58:25,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:25,035 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 71 transitions. [2023-12-02 19:58:25,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 19:58:25,035 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:25,036 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:25,036 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-12-02 19:58:25,036 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)] === [2023-12-02 19:58:25,037 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:25,037 INFO L85 PathProgramCache]: Analyzing trace with hash -250197631, now seen corresponding path program 2 times [2023-12-02 19:58:25,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:25,037 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706679833] [2023-12-02 19:58:25,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:25,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:25,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:25,595 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:25,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:25,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706679833] [2023-12-02 19:58:25,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706679833] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:25,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313545956] [2023-12-02 19:58:25,597 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:58:25,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:25,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:25,598 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:25,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:58:25,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:58:25,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:58:25,687 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 19:58:25,689 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:25,699 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:25,801 INFO L378 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 [2023-12-02 19:58:25,825 INFO L378 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 [2023-12-02 19:58:25,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:25,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:25,933 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:25,933 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:58:25,941 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:25,942 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 19:58:26,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:26,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313545956] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:26,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1394619498] [2023-12-02 19:58:26,043 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:58:26,043 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:26,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:26,044 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:26,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:26,937 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:27,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1742#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:27,642 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:27,642 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:27,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10] total 21 [2023-12-02 19:58:27,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031646515] [2023-12-02 19:58:27,643 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:27,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 19:58:27,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:27,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 19:58:27,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=788, Unknown=7, NotChecked=0, Total=870 [2023-12-02 19:58:27,645 INFO L87 Difference]: Start difference. First operand 54 states and 71 transitions. Second operand has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:30,061 INFO L93 Difference]: Finished difference Result 231 states and 300 transitions. [2023-12-02 19:58:30,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-12-02 19:58:30,061 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 19:58:30,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:30,063 INFO L225 Difference]: With dead ends: 231 [2023-12-02 19:58:30,063 INFO L226 Difference]: Without dead ends: 231 [2023-12-02 19:58:30,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 586 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=458, Invalid=2841, Unknown=7, NotChecked=0, Total=3306 [2023-12-02 19:58:30,066 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 628 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 628 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:30,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [628 Valid, 477 Invalid, 803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 19:58:30,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2023-12-02 19:58:30,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 75. [2023-12-02 19:58:30,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.4428571428571428) internal successors, (101), 74 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 101 transitions. [2023-12-02 19:58:30,072 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 101 transitions. Word has length 13 [2023-12-02 19:58:30,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:30,073 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 101 transitions. [2023-12-02 19:58:30,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,073 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 101 transitions. [2023-12-02 19:58:30,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 19:58:30,075 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:30,075 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:30,081 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:58:30,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 19:58:30,281 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:30,281 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:30,281 INFO L85 PathProgramCache]: Analyzing trace with hash 1783660199, now seen corresponding path program 1 times [2023-12-02 19:58:30,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:30,282 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585174053] [2023-12-02 19:58:30,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:30,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:30,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:30,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:30,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585174053] [2023-12-02 19:58:30,343 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [585174053] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:30,343 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:30,343 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 19:58:30,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683637179] [2023-12-02 19:58:30,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:30,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:58:30,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:30,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:58:30,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:58:30,344 INFO L87 Difference]: Start difference. First operand 75 states and 101 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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) [2023-12-02 19:58:30,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:30,401 INFO L93 Difference]: Finished difference Result 76 states and 97 transitions. [2023-12-02 19:58:30,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:58:30,402 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 [2023-12-02 19:58:30,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:30,403 INFO L225 Difference]: With dead ends: 76 [2023-12-02 19:58:30,403 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 19:58:30,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-12-02 19:58:30,404 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:30,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 40 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:30,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 19:58:30,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2023-12-02 19:58:30,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 63 states have (on average 1.3650793650793651) internal successors, (86), 67 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 86 transitions. [2023-12-02 19:58:30,407 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 86 transitions. Word has length 15 [2023-12-02 19:58:30,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:30,407 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 86 transitions. [2023-12-02 19:58:30,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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) [2023-12-02 19:58:30,408 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 86 transitions. [2023-12-02 19:58:30,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 19:58:30,409 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:30,409 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:30,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-12-02 19:58:30,410 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:30,410 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:30,410 INFO L85 PathProgramCache]: Analyzing trace with hash -261473512, now seen corresponding path program 1 times [2023-12-02 19:58:30,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:30,411 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185872950] [2023-12-02 19:58:30,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:30,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:30,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:30,606 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:30,606 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:30,606 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185872950] [2023-12-02 19:58:30,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185872950] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:30,607 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:30,607 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 19:58:30,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666999929] [2023-12-02 19:58:30,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:30,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:58:30,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:30,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:58:30,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 19:58:30,608 INFO L87 Difference]: Start difference. First operand 68 states and 86 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:30,737 INFO L93 Difference]: Finished difference Result 81 states and 98 transitions. [2023-12-02 19:58:30,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 19:58:30,737 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 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 [2023-12-02 19:58:30,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:30,738 INFO L225 Difference]: With dead ends: 81 [2023-12-02 19:58:30,738 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 19:58:30,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 19:58:30,740 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 17 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:30,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 106 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:30,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 19:58:30,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 73. [2023-12-02 19:58:30,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.3235294117647058) internal successors, (90), 72 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 90 transitions. [2023-12-02 19:58:30,744 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 90 transitions. Word has length 16 [2023-12-02 19:58:30,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:30,744 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 90 transitions. [2023-12-02 19:58:30,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:30,744 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 90 transitions. [2023-12-02 19:58:30,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 19:58:30,745 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:30,745 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:30,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-12-02 19:58:30,746 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:30,746 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:30,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1396438772, now seen corresponding path program 3 times [2023-12-02 19:58:30,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:30,747 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014230711] [2023-12-02 19:58:30,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:30,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:30,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:31,176 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:31,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:31,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014230711] [2023-12-02 19:58:31,176 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014230711] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:31,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485489847] [2023-12-02 19:58:31,177 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:58:31,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:31,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:31,178 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:31,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:58:31,267 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:58:31,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:58:31,269 INFO L262 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 41 conjunts are in the unsatisfiable core [2023-12-02 19:58:31,271 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:31,277 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:31,419 INFO L378 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 [2023-12-02 19:58:31,445 INFO L378 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 [2023-12-02 19:58:31,528 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:31,528 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:31,589 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:31,589 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:58:31,596 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:31,596 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 19:58:31,688 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:31,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485489847] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:31,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [908923224] [2023-12-02 19:58:31,690 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:58:31,690 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:31,691 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:31,691 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:31,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:32,606 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:33,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2558#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:33,349 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:33,349 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:33,349 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12] total 24 [2023-12-02 19:58:33,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148041869] [2023-12-02 19:58:33,349 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:33,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-12-02 19:58:33,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:33,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-12-02 19:58:33,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=969, Unknown=7, NotChecked=0, Total=1056 [2023-12-02 19:58:33,351 INFO L87 Difference]: Start difference. First operand 73 states and 90 transitions. Second operand has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 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) [2023-12-02 19:58:35,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:35,837 INFO L93 Difference]: Finished difference Result 246 states and 296 transitions. [2023-12-02 19:58:35,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 19:58:35,838 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 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) Word has length 17 [2023-12-02 19:58:35,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:35,839 INFO L225 Difference]: With dead ends: 246 [2023-12-02 19:58:35,839 INFO L226 Difference]: Without dead ends: 246 [2023-12-02 19:58:35,841 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=480, Invalid=3803, Unknown=7, NotChecked=0, Total=4290 [2023-12-02 19:58:35,842 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 603 mSDsluCounter, 776 mSDsCounter, 0 mSdLazyCounter, 1349 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 603 SdHoareTripleChecker+Valid, 830 SdHoareTripleChecker+Invalid, 1380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:35,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [603 Valid, 830 Invalid, 1380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1349 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 19:58:35,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2023-12-02 19:58:35,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 91. [2023-12-02 19:58:35,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.3372093023255813) internal successors, (115), 90 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:35,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2023-12-02 19:58:35,847 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 17 [2023-12-02 19:58:35,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:35,847 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2023-12-02 19:58:35,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.625) internal successors, (39), 24 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) [2023-12-02 19:58:35,848 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2023-12-02 19:58:35,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 19:58:35,849 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:35,849 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:35,854 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 19:58:36,052 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:36,053 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:36,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:36,053 INFO L85 PathProgramCache]: Analyzing trace with hash 483093159, now seen corresponding path program 1 times [2023-12-02 19:58:36,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:36,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386543423] [2023-12-02 19:58:36,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:36,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:36,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:36,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:36,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:36,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386543423] [2023-12-02 19:58:36,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386543423] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:36,203 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:36,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:58:36,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755195361] [2023-12-02 19:58:36,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:36,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:58:36,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:36,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:58:36,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:36,205 INFO L87 Difference]: Start difference. First operand 91 states and 115 transitions. Second operand has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:36,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:36,235 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2023-12-02 19:58:36,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:58:36,236 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 19:58:36,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:36,236 INFO L225 Difference]: With dead ends: 90 [2023-12-02 19:58:36,236 INFO L226 Difference]: Without dead ends: 75 [2023-12-02 19:58:36,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 19:58:36,237 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 13 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:36,238 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 30 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:58:36,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-12-02 19:58:36,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2023-12-02 19:58:36,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 71 states have (on average 1.267605633802817) internal successors, (90), 74 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:36,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2023-12-02 19:58:36,241 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 17 [2023-12-02 19:58:36,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:36,241 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2023-12-02 19:58:36,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 5.666666666666667) internal successors, (17), 3 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:36,242 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2023-12-02 19:58:36,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 19:58:36,243 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:36,243 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:36,243 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-12-02 19:58:36,243 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:36,244 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:36,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1947802398, now seen corresponding path program 1 times [2023-12-02 19:58:36,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:36,244 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955353950] [2023-12-02 19:58:36,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:36,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:36,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:36,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:58:36,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:36,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955353950] [2023-12-02 19:58:36,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955353950] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:58:36,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:58:36,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-12-02 19:58:36,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729301258] [2023-12-02 19:58:36,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:58:36,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 19:58:36,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:36,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 19:58:36,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-12-02 19:58:36,464 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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) [2023-12-02 19:58:36,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:36,567 INFO L93 Difference]: Finished difference Result 123 states and 143 transitions. [2023-12-02 19:58:36,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 19:58:36,568 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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 18 [2023-12-02 19:58:36,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:36,568 INFO L225 Difference]: With dead ends: 123 [2023-12-02 19:58:36,569 INFO L226 Difference]: Without dead ends: 93 [2023-12-02 19:58:36,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2023-12-02 19:58:36,570 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:36,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 77 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:36,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-12-02 19:58:36,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2023-12-02 19:58:36,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 85 states have (on average 1.2470588235294118) internal successors, (106), 88 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:36,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 106 transitions. [2023-12-02 19:58:36,574 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 106 transitions. Word has length 18 [2023-12-02 19:58:36,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:36,574 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 106 transitions. [2023-12-02 19:58:36,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 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) [2023-12-02 19:58:36,574 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 106 transitions. [2023-12-02 19:58:36,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 19:58:36,575 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:36,575 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:36,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-12-02 19:58:36,576 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:36,576 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:36,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1559706194, now seen corresponding path program 1 times [2023-12-02 19:58:36,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:36,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543247862] [2023-12-02 19:58:36,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:36,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:36,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:36,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:58:36,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:36,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543247862] [2023-12-02 19:58:36,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543247862] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:36,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516301113] [2023-12-02 19:58:36,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:36,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:36,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:36,830 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:36,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:58:36,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:36,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 19:58:36,941 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:37,032 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:58:37,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:37,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 19:58:37,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:58:37,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516301113] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:37,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032017469] [2023-12-02 19:58:37,228 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 19:58:37,228 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:37,229 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:37,229 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:37,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:38,454 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:40,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3502#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:40,516 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:40,516 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:40,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 17 [2023-12-02 19:58:40,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140217933] [2023-12-02 19:58:40,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:40,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 19:58:40,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:40,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 19:58:40,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=920, Unknown=1, NotChecked=0, Total=1056 [2023-12-02 19:58:40,518 INFO L87 Difference]: Start difference. First operand 89 states and 106 transitions. Second operand has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:40,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:40,725 INFO L93 Difference]: Finished difference Result 117 states and 132 transitions. [2023-12-02 19:58:40,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 19:58:40,725 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-12-02 19:58:40,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:40,726 INFO L225 Difference]: With dead ends: 117 [2023-12-02 19:58:40,726 INFO L226 Difference]: Without dead ends: 117 [2023-12-02 19:58:40,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=198, Invalid=1361, Unknown=1, NotChecked=0, Total=1560 [2023-12-02 19:58:40,728 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 107 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:40,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 83 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:58:40,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-12-02 19:58:40,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 104. [2023-12-02 19:58:40,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 100 states have (on average 1.21) internal successors, (121), 103 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) [2023-12-02 19:58:40,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 121 transitions. [2023-12-02 19:58:40,731 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 121 transitions. Word has length 20 [2023-12-02 19:58:40,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:40,731 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 121 transitions. [2023-12-02 19:58:40,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.6470588235294117) internal successors, (45), 18 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:40,731 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 121 transitions. [2023-12-02 19:58:40,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 19:58:40,731 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:40,732 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:40,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 19:58:40,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 19:58:40,932 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:40,933 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:40,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1887312217, now seen corresponding path program 4 times [2023-12-02 19:58:40,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:40,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125394725] [2023-12-02 19:58:40,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:40,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:40,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:41,689 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:41,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:41,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125394725] [2023-12-02 19:58:41,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125394725] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:41,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529780944] [2023-12-02 19:58:41,690 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:58:41,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:41,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:41,691 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:41,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:58:41,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:41,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 19:58:41,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:41,795 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:41,978 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:58:42,022 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 19:58:42,198 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:42,199 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:42,425 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:42,425 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:58:42,432 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:42,432 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 19:58:42,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 19:58:42,727 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:42,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1529780944] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:42,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104592996] [2023-12-02 19:58:42,729 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:58:42,729 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:42,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:42,729 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:42,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:43,592 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:44,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3909#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:44,565 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:44,566 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:44,566 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 15] total 37 [2023-12-02 19:58:44,566 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440075005] [2023-12-02 19:58:44,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:44,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 19:58:44,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:44,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 19:58:44,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1951, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 19:58:44,568 INFO L87 Difference]: Start difference. First operand 104 states and 121 transitions. Second operand has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 37 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:47,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:47,259 INFO L93 Difference]: Finished difference Result 269 states and 295 transitions. [2023-12-02 19:58:47,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 19:58:47,259 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 37 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-12-02 19:58:47,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:47,261 INFO L225 Difference]: With dead ends: 269 [2023-12-02 19:58:47,261 INFO L226 Difference]: Without dead ends: 255 [2023-12-02 19:58:47,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=399, Invalid=4571, Unknown=0, NotChecked=0, Total=4970 [2023-12-02 19:58:47,263 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 550 mSDsluCounter, 634 mSDsCounter, 0 mSdLazyCounter, 1471 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 550 SdHoareTripleChecker+Valid, 666 SdHoareTripleChecker+Invalid, 1504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:47,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [550 Valid, 666 Invalid, 1504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1471 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 19:58:47,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2023-12-02 19:58:47,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 130. [2023-12-02 19:58:47,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 126 states have (on average 1.2063492063492063) internal successors, (152), 129 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:47,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 152 transitions. [2023-12-02 19:58:47,268 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 152 transitions. Word has length 21 [2023-12-02 19:58:47,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:47,268 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 152 transitions. [2023-12-02 19:58:47,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 37 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:47,269 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 152 transitions. [2023-12-02 19:58:47,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 19:58:47,269 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:47,269 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:47,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:58:47,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 19:58:47,470 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:47,470 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:47,471 INFO L85 PathProgramCache]: Analyzing trace with hash -910227302, now seen corresponding path program 5 times [2023-12-02 19:58:47,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:47,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35435349] [2023-12-02 19:58:47,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:47,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:47,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:48,390 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:48,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:48,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35435349] [2023-12-02 19:58:48,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35435349] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:48,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796661679] [2023-12-02 19:58:48,391 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:58:48,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:48,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:48,393 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:48,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:58:48,576 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 19:58:48,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:58:48,578 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 19:58:48,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:48,588 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:48,784 INFO L378 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 [2023-12-02 19:58:48,821 INFO L378 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 [2023-12-02 19:58:48,985 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:48,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:49,068 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:49,068 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:58:49,073 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:49,074 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 19:58:49,183 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 5 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:49,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796661679] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:49,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1679975845] [2023-12-02 19:58:49,185 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:58:49,185 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:49,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:49,185 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:49,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:49,965 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:50,884 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4543#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:50,884 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:50,884 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:50,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 16] total 32 [2023-12-02 19:58:50,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915390780] [2023-12-02 19:58:50,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:50,885 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 19:58:50,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:50,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 19:58:50,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1531, Unknown=9, NotChecked=0, Total=1640 [2023-12-02 19:58:50,886 INFO L87 Difference]: Start difference. First operand 130 states and 152 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:53,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:53,834 INFO L93 Difference]: Finished difference Result 327 states and 359 transitions. [2023-12-02 19:58:53,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-12-02 19:58:53,835 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-12-02 19:58:53,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:53,836 INFO L225 Difference]: With dead ends: 327 [2023-12-02 19:58:53,836 INFO L226 Difference]: Without dead ends: 311 [2023-12-02 19:58:53,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=467, Invalid=4926, Unknown=9, NotChecked=0, Total=5402 [2023-12-02 19:58:53,839 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 593 mSDsluCounter, 714 mSDsCounter, 0 mSdLazyCounter, 1678 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 593 SdHoareTripleChecker+Valid, 749 SdHoareTripleChecker+Invalid, 1711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:53,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [593 Valid, 749 Invalid, 1711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1678 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 19:58:53,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2023-12-02 19:58:53,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 156. [2023-12-02 19:58:53,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 152 states have (on average 1.2039473684210527) internal successors, (183), 155 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:53,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 183 transitions. [2023-12-02 19:58:53,846 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 183 transitions. Word has length 25 [2023-12-02 19:58:53,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:53,846 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 183 transitions. [2023-12-02 19:58:53,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 32 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:53,847 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 183 transitions. [2023-12-02 19:58:53,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 19:58:53,847 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:53,847 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:53,853 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 19:58:54,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-12-02 19:58:54,048 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:54,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:54,048 INFO L85 PathProgramCache]: Analyzing trace with hash 1503727913, now seen corresponding path program 2 times [2023-12-02 19:58:54,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:54,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632321384] [2023-12-02 19:58:54,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:54,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:54,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:54,611 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:54,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:54,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632321384] [2023-12-02 19:58:54,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632321384] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:54,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050045845] [2023-12-02 19:58:54,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:58:54,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:54,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:54,613 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:54,621 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:58:54,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:58:54,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:58:54,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 47 conjunts are in the unsatisfiable core [2023-12-02 19:58:54,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:58:54,756 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:58:54,899 INFO L378 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 [2023-12-02 19:58:55,066 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 19:58:55,086 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:55,086 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:58:55,337 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:55,338 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 19:58:55,349 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:58:55,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 36 [2023-12-02 19:58:55,355 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:58:55,656 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:58:55,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050045845] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:58:55,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002173512] [2023-12-02 19:58:55,658 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 19:58:55,658 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:58:55,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:58:55,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:58:55,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:58:56,551 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:58:58,770 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5273#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:58:58,770 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:58:58,770 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:58:58,771 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 28 [2023-12-02 19:58:58,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275852046] [2023-12-02 19:58:58,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:58:58,771 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 19:58:58,771 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:58:58,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 19:58:58,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1642, Unknown=7, NotChecked=0, Total=1806 [2023-12-02 19:58:58,773 INFO L87 Difference]: Start difference. First operand 156 states and 183 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:59,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:58:59,274 INFO L93 Difference]: Finished difference Result 180 states and 206 transitions. [2023-12-02 19:58:59,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 19:58:59,275 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 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 25 [2023-12-02 19:58:59,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:58:59,276 INFO L225 Difference]: With dead ends: 180 [2023-12-02 19:58:59,276 INFO L226 Difference]: Without dead ends: 151 [2023-12-02 19:58:59,277 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=286, Invalid=2463, Unknown=7, NotChecked=0, Total=2756 [2023-12-02 19:58:59,278 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 47 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 329 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:58:59,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 140 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 329 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:58:59,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-12-02 19:58:59,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2023-12-02 19:58:59,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 147 states have (on average 1.1972789115646258) internal successors, (176), 150 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:59,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 176 transitions. [2023-12-02 19:58:59,281 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 176 transitions. Word has length 25 [2023-12-02 19:58:59,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:58:59,282 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 176 transitions. [2023-12-02 19:58:59,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:58:59,282 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 176 transitions. [2023-12-02 19:58:59,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-12-02 19:58:59,283 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:58:59,283 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:58:59,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 19:58:59,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-12-02 19:58:59,483 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:58:59,484 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:58:59,484 INFO L85 PathProgramCache]: Analyzing trace with hash 375838691, now seen corresponding path program 3 times [2023-12-02 19:58:59,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:58:59,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831126722] [2023-12-02 19:58:59,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:58:59,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:58:59,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:58:59,897 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:58:59,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:58:59,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831126722] [2023-12-02 19:58:59,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831126722] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:58:59,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537415485] [2023-12-02 19:58:59,897 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:58:59,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:58:59,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:58:59,898 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:58:59,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 19:59:00,016 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:59:00,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:59:00,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 19:59:00,021 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:59:00,138 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:59:00,298 INFO L349 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-12-02 19:59:00,298 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 45 [2023-12-02 19:59:00,417 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:59:00,417 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:59:00,791 INFO L349 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2023-12-02 19:59:00,792 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 71 treesize of output 87 [2023-12-02 19:59:00,803 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:00,804 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 51 [2023-12-02 19:59:00,811 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:59:00,825 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2023-12-02 19:59:00,855 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:00,855 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 55 [2023-12-02 19:59:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:59:01,058 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537415485] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:59:01,058 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163462466] [2023-12-02 19:59:01,060 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 19:59:01,060 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:59:01,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:59:01,061 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:59:01,061 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:59:01,957 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:59:04,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5835#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:59:04,526 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:59:04,527 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:59:04,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17, 17] total 40 [2023-12-02 19:59:04,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419707381] [2023-12-02 19:59:04,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:59:04,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2023-12-02 19:59:04,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:59:04,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2023-12-02 19:59:04,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=2693, Unknown=22, NotChecked=0, Total=2970 [2023-12-02 19:59:04,529 INFO L87 Difference]: Start difference. First operand 151 states and 176 transitions. Second operand has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:05,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:59:05,375 INFO L93 Difference]: Finished difference Result 280 states and 316 transitions. [2023-12-02 19:59:05,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 19:59:05,376 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2023-12-02 19:59:05,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:59:05,377 INFO L225 Difference]: With dead ends: 280 [2023-12-02 19:59:05,377 INFO L226 Difference]: Without dead ends: 192 [2023-12-02 19:59:05,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=727, Invalid=5256, Unknown=23, NotChecked=0, Total=6006 [2023-12-02 19:59:05,379 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 206 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:59:05,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 175 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:59:05,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2023-12-02 19:59:05,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 183. [2023-12-02 19:59:05,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 179 states have (on average 1.1843575418994414) internal successors, (212), 182 states have internal predecessors, (212), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:05,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 212 transitions. [2023-12-02 19:59:05,383 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 212 transitions. Word has length 27 [2023-12-02 19:59:05,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:59:05,383 INFO L495 AbstractCegarLoop]: Abstraction has 183 states and 212 transitions. [2023-12-02 19:59:05,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.575) internal successors, (63), 40 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:05,384 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 212 transitions. [2023-12-02 19:59:05,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 19:59:05,384 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:59:05,384 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:59:05,390 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 19:59:05,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-12-02 19:59:05,585 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:59:05,585 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:59:05,585 INFO L85 PathProgramCache]: Analyzing trace with hash -124891955, now seen corresponding path program 6 times [2023-12-02 19:59:05,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:59:05,586 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714320240] [2023-12-02 19:59:05,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:59:05,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:59:05,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:06,340 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 9 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:59:06,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:59:06,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714320240] [2023-12-02 19:59:06,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714320240] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:59:06,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075402005] [2023-12-02 19:59:06,340 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:59:06,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:06,341 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:59:06,347 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:59:06,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 19:59:06,471 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:59:06,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:59:06,474 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 19:59:06,477 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:59:06,481 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:59:06,665 INFO L378 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 17 treesize of output 13 [2023-12-02 19:59:06,737 INFO L378 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 22 treesize of output 17 [2023-12-02 19:59:07,367 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:07,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 20 [2023-12-02 19:59:07,442 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:59:07,442 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:59:08,065 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:08,065 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:59:08,078 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:08,078 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 37 [2023-12-02 19:59:08,086 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2023-12-02 19:59:08,094 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 19:59:08,465 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:59:08,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075402005] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:59:08,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [690691252] [2023-12-02 19:59:08,466 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:59:08,466 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:59:08,467 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:59:08,467 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:59:08,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:59:09,141 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:59:10,122 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6575#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:59:10,122 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:59:10,122 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:59:10,122 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 17] total 47 [2023-12-02 19:59:10,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089084090] [2023-12-02 19:59:10,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:59:10,123 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 19:59:10,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:59:10,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 19:59:10,125 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=2953, Unknown=1, NotChecked=0, Total=3192 [2023-12-02 19:59:10,125 INFO L87 Difference]: Start difference. First operand 183 states and 212 transitions. Second operand has 48 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 48 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:15,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:18,209 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:19,437 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:21,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:23,820 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:25,976 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 19:59:26,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:59:26,915 INFO L93 Difference]: Finished difference Result 304 states and 338 transitions. [2023-12-02 19:59:26,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-12-02 19:59:26,916 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 48 states have internal predecessors, (85), 0 states have call successors, (0), 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 29 [2023-12-02 19:59:26,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:59:26,917 INFO L225 Difference]: With dead ends: 304 [2023-12-02 19:59:26,917 INFO L226 Difference]: Without dead ends: 293 [2023-12-02 19:59:26,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1180 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=672, Invalid=6133, Unknown=1, NotChecked=0, Total=6806 [2023-12-02 19:59:26,919 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 596 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 1661 mSolverCounterSat, 54 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 596 SdHoareTripleChecker+Valid, 683 SdHoareTripleChecker+Invalid, 1720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 1661 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.7s IncrementalHoareTripleChecker+Time [2023-12-02 19:59:26,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [596 Valid, 683 Invalid, 1720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 1661 Invalid, 5 Unknown, 0 Unchecked, 12.7s Time] [2023-12-02 19:59:26,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2023-12-02 19:59:26,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 202. [2023-12-02 19:59:26,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 198 states have (on average 1.1767676767676767) internal successors, (233), 201 states have internal predecessors, (233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:26,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 233 transitions. [2023-12-02 19:59:26,926 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 233 transitions. Word has length 29 [2023-12-02 19:59:26,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:59:26,926 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 233 transitions. [2023-12-02 19:59:26,926 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.8085106382978724) internal successors, (85), 48 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:26,926 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 233 transitions. [2023-12-02 19:59:26,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 19:59:26,927 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:59:26,927 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:59:26,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 19:59:27,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:27,128 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:59:27,128 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:59:27,129 INFO L85 PathProgramCache]: Analyzing trace with hash -390699821, now seen corresponding path program 4 times [2023-12-02 19:59:27,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:59:27,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071093420] [2023-12-02 19:59:27,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:59:27,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:59:27,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:27,381 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:59:27,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:59:27,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071093420] [2023-12-02 19:59:27,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071093420] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:59:27,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393530870] [2023-12-02 19:59:27,382 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:59:27,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:27,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:59:27,383 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:59:27,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 19:59:27,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:27,509 INFO L262 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 33 conjunts are in the unsatisfiable core [2023-12-02 19:59:27,510 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:59:27,619 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:59:27,619 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:59:27,762 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 19:59:27,804 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 19:59:27,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393530870] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:59:27,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052017142] [2023-12-02 19:59:27,806 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 19:59:27,806 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:59:27,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:59:27,806 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:59:27,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:59:28,676 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:59:30,971 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7331#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:59:30,972 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:59:30,972 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:59:30,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2023-12-02 19:59:30,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336457396] [2023-12-02 19:59:30,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:59:30,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 19:59:30,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:59:30,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 19:59:30,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1119, Unknown=1, NotChecked=0, Total=1260 [2023-12-02 19:59:30,974 INFO L87 Difference]: Start difference. First operand 202 states and 233 transitions. Second operand has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:31,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:59:31,321 INFO L93 Difference]: Finished difference Result 250 states and 276 transitions. [2023-12-02 19:59:31,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 19:59:31,322 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 0 states have call successors, (0), 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 29 [2023-12-02 19:59:31,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:59:31,323 INFO L225 Difference]: With dead ends: 250 [2023-12-02 19:59:31,323 INFO L226 Difference]: Without dead ends: 250 [2023-12-02 19:59:31,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 58 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=234, Invalid=1835, Unknown=1, NotChecked=0, Total=2070 [2023-12-02 19:59:31,325 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 134 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:59:31,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 101 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:59:31,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2023-12-02 19:59:31,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 228. [2023-12-02 19:59:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 224 states have (on average 1.1607142857142858) internal successors, (260), 227 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 260 transitions. [2023-12-02 19:59:31,331 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 260 transitions. Word has length 29 [2023-12-02 19:59:31,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:59:31,331 INFO L495 AbstractCegarLoop]: Abstraction has 228 states and 260 transitions. [2023-12-02 19:59:31,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.95) internal successors, (59), 21 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:31,331 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 260 transitions. [2023-12-02 19:59:31,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 19:59:31,332 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:59:31,332 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:59:31,337 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 19:59:31,532 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:31,533 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:59:31,533 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:59:31,533 INFO L85 PathProgramCache]: Analyzing trace with hash 237916166, now seen corresponding path program 7 times [2023-12-02 19:59:31,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:59:31,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113125004] [2023-12-02 19:59:31,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:59:31,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:59:31,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:32,104 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:59:32,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:59:32,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113125004] [2023-12-02 19:59:32,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113125004] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:59:32,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720536724] [2023-12-02 19:59:32,105 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:59:32,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:32,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:59:32,108 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:59:32,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 19:59:32,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:32,226 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 19:59:32,228 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:59:32,232 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:59:32,448 INFO L378 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 [2023-12-02 19:59:32,488 INFO L378 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 [2023-12-02 19:59:32,532 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:59:32,532 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:59:32,557 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_505 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_505) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 5 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 19:59:32,563 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:32,563 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 19:59:32,570 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:32,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 19:59:32,697 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 18 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:59:32,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720536724] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:59:32,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483032808] [2023-12-02 19:59:32,698 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:59:32,698 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:59:32,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:59:32,699 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:59:32,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:59:33,398 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:59:34,325 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8055#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 19:59:34,325 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:59:34,326 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:59:34,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2023-12-02 19:59:34,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517823450] [2023-12-02 19:59:34,326 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:59:34,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-12-02 19:59:34,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:59:34,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-12-02 19:59:34,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1377, Unknown=1, NotChecked=74, Total=1560 [2023-12-02 19:59:34,327 INFO L87 Difference]: Start difference. First operand 228 states and 260 transitions. Second operand has 31 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 31 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:35,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:59:35,554 INFO L93 Difference]: Finished difference Result 390 states and 431 transitions. [2023-12-02 19:59:35,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 19:59:35,554 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 31 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2023-12-02 19:59:35,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:59:35,556 INFO L225 Difference]: With dead ends: 390 [2023-12-02 19:59:35,556 INFO L226 Difference]: Without dead ends: 362 [2023-12-02 19:59:35,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 450 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=260, Invalid=2935, Unknown=1, NotChecked=110, Total=3306 [2023-12-02 19:59:35,558 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 197 mSDsluCounter, 711 mSDsCounter, 0 mSdLazyCounter, 1148 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 1277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 106 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 19:59:35,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 752 Invalid, 1277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1148 Invalid, 0 Unknown, 106 Unchecked, 0.6s Time] [2023-12-02 19:59:35,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2023-12-02 19:59:35,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 239. [2023-12-02 19:59:35,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 235 states have (on average 1.1659574468085105) internal successors, (274), 238 states have internal predecessors, (274), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:35,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 274 transitions. [2023-12-02 19:59:35,563 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 274 transitions. Word has length 31 [2023-12-02 19:59:35,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:59:35,563 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 274 transitions. [2023-12-02 19:59:35,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.7096774193548387) internal successors, (53), 31 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:59:35,563 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 274 transitions. [2023-12-02 19:59:35,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-12-02 19:59:35,564 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:59:35,564 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:59:35,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 19:59:35,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-12-02 19:59:35,765 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 19:59:35,765 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:59:35,765 INFO L85 PathProgramCache]: Analyzing trace with hash -464608448, now seen corresponding path program 8 times [2023-12-02 19:59:35,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:59:35,765 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282055348] [2023-12-02 19:59:35,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:59:35,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:59:35,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:59:36,947 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 16 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:59:36,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:59:36,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282055348] [2023-12-02 19:59:36,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282055348] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:59:36,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167982503] [2023-12-02 19:59:36,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:59:36,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:59:36,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:59:36,948 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:59:36,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 19:59:37,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-12-02 19:59:37,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:59:37,100 INFO L262 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 55 conjunts are in the unsatisfiable core [2023-12-02 19:59:37,102 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:59:37,106 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 19:59:37,324 INFO L378 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 17 treesize of output 13 [2023-12-02 19:59:37,399 INFO L378 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 22 treesize of output 17 [2023-12-02 19:59:58,481 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:58,482 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 20 [2023-12-02 19:59:58,607 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:59:58,607 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:59:59,736 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:59,736 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 25 [2023-12-02 19:59:59,747 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 19:59:59,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 36 treesize of output 35 [2023-12-02 19:59:59,754 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2023-12-02 19:59:59,761 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-12-02 20:00:00,270 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:00:00,270 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167982503] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:00:00,270 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [889546181] [2023-12-02 20:00:00,271 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:00:00,271 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:00:00,272 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:00:00,272 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:00:00,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:00:00,952 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:00:02,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8974#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:00:02,128 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:00:02,128 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:00:02,128 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 52 [2023-12-02 20:00:02,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20716919] [2023-12-02 20:00:02,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:00:02,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 20:00:02,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:00:02,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 20:00:02,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=3456, Unknown=6, NotChecked=0, Total=3782 [2023-12-02 20:00:02,131 INFO L87 Difference]: Start difference. First operand 239 states and 274 transitions. Second operand has 53 states, 52 states have (on average 1.8846153846153846) internal successors, (98), 53 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:00:08,677 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:10,924 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:12,928 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:14,939 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:16,512 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:22,013 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.61s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:26,105 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result VALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:28,338 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:30,354 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:32,367 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:34,409 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:36,416 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:38,813 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:40,828 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:42,852 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:45,050 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:49,703 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:51,738 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:53,744 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:55,750 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:00:57,759 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:01:00,350 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:01:02,359 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:01:06,099 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:01:08,416 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 20:01:08,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:08,434 INFO L93 Difference]: Finished difference Result 422 states and 464 transitions. [2023-12-02 20:01:08,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 20:01:08,435 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.8846153846153846) internal successors, (98), 53 states have internal predecessors, (98), 0 states have call successors, (0), 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 33 [2023-12-02 20:01:08,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:08,437 INFO L225 Difference]: With dead ends: 422 [2023-12-02 20:01:08,437 INFO L226 Difference]: Without dead ends: 411 [2023-12-02 20:01:08,438 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2023 ImplicationChecksByTransitivity, 38.3s TimeCoverageRelationStatistics Valid=959, Invalid=7776, Unknown=7, NotChecked=0, Total=8742 [2023-12-02 20:01:08,439 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 961 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 102 mSolverCounterUnsat, 19 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 51.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 961 SdHoareTripleChecker+Valid, 655 SdHoareTripleChecker+Invalid, 1681 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 19 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 52.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:08,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [961 Valid, 655 Invalid, 1681 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1560 Invalid, 19 Unknown, 0 Unchecked, 52.0s Time] [2023-12-02 20:01:08,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2023-12-02 20:01:08,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 263. [2023-12-02 20:01:08,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 259 states have (on average 1.1583011583011582) internal successors, (300), 262 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:08,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 300 transitions. [2023-12-02 20:01:08,448 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 300 transitions. Word has length 33 [2023-12-02 20:01:08,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:08,448 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 300 transitions. [2023-12-02 20:01:08,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.8846153846153846) internal successors, (98), 53 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:08,448 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 300 transitions. [2023-12-02 20:01:08,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 20:01:08,449 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:08,449 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:08,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 20:01:08,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:08,650 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:08,650 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:08,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1486897289, now seen corresponding path program 1 times [2023-12-02 20:01:08,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:08,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156606742] [2023-12-02 20:01:08,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:08,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:09,305 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:01:09,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:09,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156606742] [2023-12-02 20:01:09,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156606742] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:09,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937299159] [2023-12-02 20:01:09,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:09,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:09,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:09,307 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:09,309 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 20:01:09,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:09,420 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 54 conjunts are in the unsatisfiable core [2023-12-02 20:01:09,423 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:09,480 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:01:09,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:01:09,486 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:01:10,358 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 2 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:10,359 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:11,132 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:01:11,179 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 8 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:11,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937299159] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:11,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274854820] [2023-12-02 20:01:11,181 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:01:11,181 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:11,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:11,181 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:11,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:12,172 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:14,005 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9980#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:14,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:14,005 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:14,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 45 [2023-12-02 20:01:14,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854764397] [2023-12-02 20:01:14,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:14,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-12-02 20:01:14,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:14,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-12-02 20:01:14,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=3287, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 20:01:14,007 INFO L87 Difference]: Start difference. First operand 263 states and 300 transitions. Second operand has 46 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 46 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:21,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:21,699 INFO L93 Difference]: Finished difference Result 624 states and 691 transitions. [2023-12-02 20:01:21,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2023-12-02 20:01:21,700 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 46 states have internal predecessors, (100), 0 states have call successors, (0), 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 34 [2023-12-02 20:01:21,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:21,702 INFO L225 Difference]: With dead ends: 624 [2023-12-02 20:01:21,702 INFO L226 Difference]: Without dead ends: 606 [2023-12-02 20:01:21,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4288 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=2403, Invalid=13853, Unknown=0, NotChecked=0, Total=16256 [2023-12-02 20:01:21,703 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 620 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 1307 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 620 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 1382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:21,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [620 Valid, 146 Invalid, 1382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1307 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 20:01:21,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2023-12-02 20:01:21,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 349. [2023-12-02 20:01:21,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 345 states have (on average 1.153623188405797) internal successors, (398), 348 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:21,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 398 transitions. [2023-12-02 20:01:21,710 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 398 transitions. Word has length 34 [2023-12-02 20:01:21,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:21,711 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 398 transitions. [2023-12-02 20:01:21,711 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 46 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:21,711 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 398 transitions. [2023-12-02 20:01:21,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 20:01:21,711 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:21,711 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:21,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 20:01:21,912 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2023-12-02 20:01:21,912 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:21,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:21,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1486888253, now seen corresponding path program 1 times [2023-12-02 20:01:21,912 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:21,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976258400] [2023-12-02 20:01:21,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:21,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:21,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 19 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:01:22,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:22,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976258400] [2023-12-02 20:01:22,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976258400] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:22,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693715999] [2023-12-02 20:01:22,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:22,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:22,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:22,727 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:22,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 20:01:22,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:22,847 INFO L262 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 77 conjunts are in the unsatisfiable core [2023-12-02 20:01:22,849 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:22,897 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:01:22,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:01:22,907 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:01:24,061 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:24,061 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:25,273 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:01:25,341 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:25,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693715999] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:25,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2097318488] [2023-12-02 20:01:25,343 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:01:25,343 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:25,343 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:25,343 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:25,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:26,235 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:28,614 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11354#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:28,614 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:28,614 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:28,614 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 18, 19] total 51 [2023-12-02 20:01:28,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207342681] [2023-12-02 20:01:28,614 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:28,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 20:01:28,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:28,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 20:01:28,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=362, Invalid=4194, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 20:01:28,616 INFO L87 Difference]: Start difference. First operand 349 states and 398 transitions. Second operand has 53 states, 52 states have (on average 1.9230769230769231) internal successors, (100), 52 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:32,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:32,901 INFO L93 Difference]: Finished difference Result 538 states and 595 transitions. [2023-12-02 20:01:32,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 20:01:32,902 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.9230769230769231) internal successors, (100), 52 states have internal predecessors, (100), 0 states have call successors, (0), 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 34 [2023-12-02 20:01:32,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:32,905 INFO L225 Difference]: With dead ends: 538 [2023-12-02 20:01:32,905 INFO L226 Difference]: Without dead ends: 538 [2023-12-02 20:01:32,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3004 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=1387, Invalid=9533, Unknown=0, NotChecked=0, Total=10920 [2023-12-02 20:01:32,906 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 672 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 1017 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 672 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 1067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1017 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:32,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [672 Valid, 88 Invalid, 1067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1017 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 20:01:32,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2023-12-02 20:01:32,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 355. [2023-12-02 20:01:32,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 351 states have (on average 1.1566951566951567) internal successors, (406), 354 states have internal predecessors, (406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:32,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 406 transitions. [2023-12-02 20:01:32,915 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 406 transitions. Word has length 34 [2023-12-02 20:01:32,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:32,915 INFO L495 AbstractCegarLoop]: Abstraction has 355 states and 406 transitions. [2023-12-02 20:01:32,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.9230769230769231) internal successors, (100), 52 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:32,916 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 406 transitions. [2023-12-02 20:01:32,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 20:01:32,917 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:32,917 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:32,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-12-02 20:01:33,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 20:01:33,121 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:33,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:33,121 INFO L85 PathProgramCache]: Analyzing trace with hash 700588324, now seen corresponding path program 5 times [2023-12-02 20:01:33,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:33,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986090834] [2023-12-02 20:01:33,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:33,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:33,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:33,976 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 12 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:33,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:33,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986090834] [2023-12-02 20:01:33,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1986090834] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:33,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874016047] [2023-12-02 20:01:33,976 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:01:33,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:33,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:33,977 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:33,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 20:01:34,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 20:01:34,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:01:34,307 INFO L262 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 83 conjunts are in the unsatisfiable core [2023-12-02 20:01:34,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:34,315 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:01:34,573 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:01:34,665 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:01:34,751 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:01:34,829 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 9 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:34,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:34,838 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_682 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_682) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2023-12-02 20:01:34,903 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_682 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_682) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ 2 |c_ULTIMATE.start_cstrncat_~s2#1.offset|)) 0)) is different from false [2023-12-02 20:01:34,916 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:01:34,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 20:01:34,921 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:01:34,921 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 20:01:34,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 20:01:35,201 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 13 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 8 not checked. [2023-12-02 20:01:35,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874016047] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:35,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412160635] [2023-12-02 20:01:35,203 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:01:35,203 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:35,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:35,203 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:35,203 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:36,071 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:38,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12575#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:38,640 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:38,640 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:38,640 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 16] total 41 [2023-12-02 20:01:38,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533931598] [2023-12-02 20:01:38,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:38,641 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-12-02 20:01:38,641 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:38,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-12-02 20:01:38,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2632, Unknown=14, NotChecked=210, Total=3080 [2023-12-02 20:01:38,642 INFO L87 Difference]: Start difference. First operand 355 states and 406 transitions. Second operand has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:39,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:39,645 INFO L93 Difference]: Finished difference Result 401 states and 449 transitions. [2023-12-02 20:01:39,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-12-02 20:01:39,645 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 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 34 [2023-12-02 20:01:39,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:39,647 INFO L225 Difference]: With dead ends: 401 [2023-12-02 20:01:39,647 INFO L226 Difference]: Without dead ends: 342 [2023-12-02 20:01:39,648 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1357 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=532, Invalid=4718, Unknown=14, NotChecked=286, Total=5550 [2023-12-02 20:01:39,648 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 155 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 561 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 561 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:39,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [155 Valid, 194 Invalid, 701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 561 Invalid, 0 Unknown, 126 Unchecked, 0.3s Time] [2023-12-02 20:01:39,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2023-12-02 20:01:39,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 342. [2023-12-02 20:01:39,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 338 states have (on average 1.150887573964497) internal successors, (389), 341 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:39,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 389 transitions. [2023-12-02 20:01:39,653 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 389 transitions. Word has length 34 [2023-12-02 20:01:39,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:39,653 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 389 transitions. [2023-12-02 20:01:39,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:39,654 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 389 transitions. [2023-12-02 20:01:39,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 20:01:39,654 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:39,654 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:39,659 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 20:01:39,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 20:01:39,855 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:39,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:39,855 INFO L85 PathProgramCache]: Analyzing trace with hash 187880889, now seen corresponding path program 9 times [2023-12-02 20:01:39,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:39,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210157264] [2023-12-02 20:01:39,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:39,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:39,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:40,443 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:01:40,443 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:40,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210157264] [2023-12-02 20:01:40,444 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210157264] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:40,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095946162] [2023-12-02 20:01:40,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:01:40,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:40,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:40,445 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:40,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 20:01:40,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:01:40,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:01:40,584 INFO L262 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 74 conjunts are in the unsatisfiable core [2023-12-02 20:01:40,586 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:40,922 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:01:40,966 INFO L378 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 19 treesize of output 18 [2023-12-02 20:01:41,477 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:01:41,478 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:41,706 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:01:41,707 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 93 treesize of output 83 [2023-12-02 20:01:42,335 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 23 proven. 76 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:01:42,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095946162] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:42,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2102258171] [2023-12-02 20:01:42,337 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:01:42,337 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:42,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:42,337 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:42,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:42,995 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:44,012 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13629#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:44,012 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:44,012 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:44,012 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 22, 22] total 52 [2023-12-02 20:01:44,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1066260362] [2023-12-02 20:01:44,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:44,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-12-02 20:01:44,013 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:44,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-12-02 20:01:44,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=3479, Unknown=0, NotChecked=0, Total=3660 [2023-12-02 20:01:44,014 INFO L87 Difference]: Start difference. First operand 342 states and 389 transitions. Second operand has 52 states, 52 states have (on average 1.6153846153846154) internal successors, (84), 52 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:46,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:46,478 INFO L93 Difference]: Finished difference Result 561 states and 625 transitions. [2023-12-02 20:01:46,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-12-02 20:01:46,478 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6153846153846154) internal successors, (84), 52 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-12-02 20:01:46,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:46,481 INFO L225 Difference]: With dead ends: 561 [2023-12-02 20:01:46,481 INFO L226 Difference]: Without dead ends: 529 [2023-12-02 20:01:46,481 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1783 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=625, Invalid=9475, Unknown=0, NotChecked=0, Total=10100 [2023-12-02 20:01:46,482 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 263 mSDsluCounter, 1094 mSDsCounter, 0 mSdLazyCounter, 1884 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 1138 SdHoareTripleChecker+Invalid, 1913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:46,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [263 Valid, 1138 Invalid, 1913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1884 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 20:01:46,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2023-12-02 20:01:46,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 359. [2023-12-02 20:01:46,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 355 states have (on average 1.1605633802816901) internal successors, (412), 358 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:46,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 412 transitions. [2023-12-02 20:01:46,488 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 412 transitions. Word has length 35 [2023-12-02 20:01:46,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:46,488 INFO L495 AbstractCegarLoop]: Abstraction has 359 states and 412 transitions. [2023-12-02 20:01:46,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6153846153846154) internal successors, (84), 52 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:46,488 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 412 transitions. [2023-12-02 20:01:46,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 20:01:46,489 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:46,489 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:46,495 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 20:01:46,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2023-12-02 20:01:46,690 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:46,690 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:46,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1165446058, now seen corresponding path program 6 times [2023-12-02 20:01:46,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:46,690 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825594405] [2023-12-02 20:01:46,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:46,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:46,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:47,452 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 9 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:47,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:47,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825594405] [2023-12-02 20:01:47,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825594405] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:47,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1175073365] [2023-12-02 20:01:47,453 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:01:47,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:47,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:47,453 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:47,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 20:01:47,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:01:47,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:01:47,605 INFO L262 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 69 conjunts are in the unsatisfiable core [2023-12-02 20:01:47,607 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:47,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:01:47,928 INFO L349 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-12-02 20:01:47,929 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 45 [2023-12-02 20:01:48,099 INFO L378 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 24 treesize of output 17 [2023-12-02 20:01:48,167 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 9 proven. 19 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:01:48,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:48,176 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_775 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_775) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2023-12-02 20:01:48,183 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_775 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_775) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2023-12-02 20:01:48,536 INFO L349 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2023-12-02 20:01:48,536 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 71 treesize of output 87 [2023-12-02 20:01:48,550 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:01:48,550 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 51 [2023-12-02 20:01:48,557 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:01:48,570 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2023-12-02 20:01:48,596 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:01:48,596 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 55 [2023-12-02 20:01:48,868 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 8 not checked. [2023-12-02 20:01:48,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1175073365] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:48,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729122112] [2023-12-02 20:01:48,869 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:01:48,869 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:48,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:48,869 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:48,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:49,732 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:52,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14898#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:52,281 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:52,281 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:52,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 50 [2023-12-02 20:01:52,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22694495] [2023-12-02 20:01:52,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:52,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-12-02 20:01:52,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:52,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-12-02 20:01:52,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3599, Unknown=21, NotChecked=246, Total=4160 [2023-12-02 20:01:52,283 INFO L87 Difference]: Start difference. First operand 359 states and 412 transitions. Second operand has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:53,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:01:53,800 INFO L93 Difference]: Finished difference Result 656 states and 729 transitions. [2023-12-02 20:01:53,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 20:01:53,801 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 0 states have call successors, (0), 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 36 [2023-12-02 20:01:53,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:01:53,804 INFO L225 Difference]: With dead ends: 656 [2023-12-02 20:01:53,804 INFO L226 Difference]: Without dead ends: 479 [2023-12-02 20:01:53,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1978 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=758, Invalid=7061, Unknown=21, NotChecked=350, Total=8190 [2023-12-02 20:01:53,805 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 146 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 957 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 158 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:01:53,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 232 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 957 Invalid, 0 Unknown, 158 Unchecked, 0.5s Time] [2023-12-02 20:01:53,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2023-12-02 20:01:53,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 444. [2023-12-02 20:01:53,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 440 states have (on average 1.1522727272727273) internal successors, (507), 443 states have internal predecessors, (507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:53,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 507 transitions. [2023-12-02 20:01:53,814 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 507 transitions. Word has length 36 [2023-12-02 20:01:53,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:01:53,815 INFO L495 AbstractCegarLoop]: Abstraction has 444 states and 507 transitions. [2023-12-02 20:01:53,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.68) internal successors, (84), 50 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:01:53,815 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 507 transitions. [2023-12-02 20:01:53,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-12-02 20:01:53,816 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:01:53,816 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:01:53,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 20:01:54,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2023-12-02 20:01:54,017 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:01:54,017 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:01:54,017 INFO L85 PathProgramCache]: Analyzing trace with hash 1713568755, now seen corresponding path program 10 times [2023-12-02 20:01:54,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:01:54,017 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280481306] [2023-12-02 20:01:54,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:01:54,018 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:01:54,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:55,137 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 25 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:55,138 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:01:55,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280481306] [2023-12-02 20:01:55,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280481306] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:01:55,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173031486] [2023-12-02 20:01:55,138 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:01:55,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:01:55,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:01:55,139 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:01:55,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 20:01:55,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:01:55,259 INFO L262 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 71 conjunts are in the unsatisfiable core [2023-12-02 20:01:55,261 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:01:55,264 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:01:55,612 INFO L378 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 [2023-12-02 20:01:55,656 INFO L378 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 [2023-12-02 20:01:55,985 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 8 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:55,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:01:56,085 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 16 [2023-12-02 20:01:56,087 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-12-02 20:01:56,247 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 8 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:01:56,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173031486] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:01:56,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1090394489] [2023-12-02 20:01:56,249 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:01:56,249 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:01:56,249 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:01:56,249 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:01:56,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:01:56,888 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:01:57,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16327#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:01:57,832 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:01:57,832 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:01:57,832 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 22, 22] total 43 [2023-12-02 20:01:57,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223315914] [2023-12-02 20:01:57,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:01:57,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-12-02 20:01:57,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:01:57,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-12-02 20:01:57,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2520, Unknown=0, NotChecked=0, Total=2652 [2023-12-02 20:01:57,833 INFO L87 Difference]: Start difference. First operand 444 states and 507 transitions. Second operand has 43 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:03,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:02:03,321 INFO L93 Difference]: Finished difference Result 1024 states and 1135 transitions. [2023-12-02 20:02:03,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-12-02 20:02:03,322 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 states have internal predecessors, (77), 0 states have call successors, (0), 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 37 [2023-12-02 20:02:03,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:02:03,325 INFO L225 Difference]: With dead ends: 1024 [2023-12-02 20:02:03,325 INFO L226 Difference]: Without dead ends: 952 [2023-12-02 20:02:03,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1813 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=678, Invalid=9222, Unknown=0, NotChecked=0, Total=9900 [2023-12-02 20:02:03,326 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 713 mSDsluCounter, 1272 mSDsCounter, 0 mSdLazyCounter, 3113 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 713 SdHoareTripleChecker+Valid, 1316 SdHoareTripleChecker+Invalid, 3162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 3113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:02:03,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [713 Valid, 1316 Invalid, 3162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 3113 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 20:02:03,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 952 states. [2023-12-02 20:02:03,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 952 to 511. [2023-12-02 20:02:03,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 507 states have (on average 1.1518737672583828) internal successors, (584), 510 states have internal predecessors, (584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:03,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 584 transitions. [2023-12-02 20:02:03,337 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 584 transitions. Word has length 37 [2023-12-02 20:02:03,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:02:03,337 INFO L495 AbstractCegarLoop]: Abstraction has 511 states and 584 transitions. [2023-12-02 20:02:03,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.7906976744186047) internal successors, (77), 43 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:03,338 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 584 transitions. [2023-12-02 20:02:03,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 20:02:03,339 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:02:03,339 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:02:03,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 20:02:03,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2023-12-02 20:02:03,539 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:02:03,540 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:02:03,540 INFO L85 PathProgramCache]: Analyzing trace with hash 2068563770, now seen corresponding path program 7 times [2023-12-02 20:02:03,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:02:03,540 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626770579] [2023-12-02 20:02:03,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:02:03,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:02:03,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:02:03,879 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 1 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:02:03,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:02:03,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626770579] [2023-12-02 20:02:03,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626770579] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:02:03,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304283650] [2023-12-02 20:02:03,879 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:02:03,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:02:03,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:02:03,880 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:02:03,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 20:02:03,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:02:03,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 42 conjunts are in the unsatisfiable core [2023-12-02 20:02:03,993 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:02:04,132 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:02:04,132 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:02:04,316 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 20:02:04,364 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 4 proven. 29 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:02:04,364 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [304283650] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:02:04,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1873834031] [2023-12-02 20:02:04,366 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:02:04,366 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:02:04,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:02:04,366 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:02:04,366 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:02:05,205 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:02:07,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18214#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:02:07,429 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:02:07,429 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:02:07,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 24 [2023-12-02 20:02:07,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851448882] [2023-12-02 20:02:07,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:02:07,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 20:02:07,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:02:07,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 20:02:07,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1413, Unknown=1, NotChecked=0, Total=1560 [2023-12-02 20:02:07,431 INFO L87 Difference]: Start difference. First operand 511 states and 584 transitions. Second operand has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:08,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:02:08,014 INFO L93 Difference]: Finished difference Result 594 states and 659 transitions. [2023-12-02 20:02:08,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 20:02:08,014 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 0 states have call successors, (0), 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 38 [2023-12-02 20:02:08,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:02:08,017 INFO L225 Difference]: With dead ends: 594 [2023-12-02 20:02:08,017 INFO L226 Difference]: Without dead ends: 594 [2023-12-02 20:02:08,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 82 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=263, Invalid=2388, Unknown=1, NotChecked=0, Total=2652 [2023-12-02 20:02:08,017 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 125 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 20:02:08,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 150 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 20:02:08,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2023-12-02 20:02:08,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 557. [2023-12-02 20:02:08,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 557 states, 553 states have (on average 1.139240506329114) internal successors, (630), 556 states have internal predecessors, (630), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:08,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 557 states to 557 states and 630 transitions. [2023-12-02 20:02:08,025 INFO L78 Accepts]: Start accepts. Automaton has 557 states and 630 transitions. Word has length 38 [2023-12-02 20:02:08,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:02:08,025 INFO L495 AbstractCegarLoop]: Abstraction has 557 states and 630 transitions. [2023-12-02 20:02:08,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 25 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:08,026 INFO L276 IsEmpty]: Start isEmpty. Operand 557 states and 630 transitions. [2023-12-02 20:02:08,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 20:02:08,027 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:02:08,027 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:02:08,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-12-02 20:02:08,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2023-12-02 20:02:08,227 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:02:08,228 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:02:08,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1040724150, now seen corresponding path program 2 times [2023-12-02 20:02:08,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:02:08,228 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101028009] [2023-12-02 20:02:08,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:02:08,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:02:08,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:02:08,869 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:08,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:02:08,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101028009] [2023-12-02 20:02:08,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101028009] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:02:08,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888909519] [2023-12-02 20:02:08,869 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:02:08,870 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:02:08,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:02:08,870 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:02:08,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-12-02 20:02:09,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 20:02:09,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:02:09,168 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 54 conjunts are in the unsatisfiable core [2023-12-02 20:02:09,170 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:02:09,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:02:09,213 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:02:09,218 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:02:10,966 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:10,966 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:02:11,992 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:02:12,062 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:12,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888909519] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:02:12,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1709732235] [2023-12-02 20:02:12,064 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:02:12,064 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:02:12,064 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:02:12,065 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:02:12,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:02:12,933 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:02:14,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19674#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:02:14,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:02:14,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:02:14,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15, 15] total 47 [2023-12-02 20:02:14,859 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46401548] [2023-12-02 20:02:14,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:02:14,859 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 20:02:14,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:02:14,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 20:02:14,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=3549, Unknown=0, NotChecked=0, Total=3782 [2023-12-02 20:02:14,860 INFO L87 Difference]: Start difference. First operand 557 states and 630 transitions. Second operand has 48 states, 47 states have (on average 2.297872340425532) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:37,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:02:37,265 INFO L93 Difference]: Finished difference Result 882 states and 970 transitions. [2023-12-02 20:02:37,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2023-12-02 20:02:37,265 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 2.297872340425532) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2023-12-02 20:02:37,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:02:37,269 INFO L225 Difference]: With dead ends: 882 [2023-12-02 20:02:37,269 INFO L226 Difference]: Without dead ends: 852 [2023-12-02 20:02:37,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6961 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=3662, Invalid=21778, Unknown=0, NotChecked=0, Total=25440 [2023-12-02 20:02:37,270 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 821 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 1941 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 821 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 2037 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 1941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:02:37,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [821 Valid, 259 Invalid, 2037 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 1941 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-12-02 20:02:37,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 852 states. [2023-12-02 20:02:37,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 852 to 524. [2023-12-02 20:02:37,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 520 states have (on average 1.148076923076923) internal successors, (597), 523 states have internal predecessors, (597), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:37,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 597 transitions. [2023-12-02 20:02:37,283 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 597 transitions. Word has length 38 [2023-12-02 20:02:37,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:02:37,283 INFO L495 AbstractCegarLoop]: Abstraction has 524 states and 597 transitions. [2023-12-02 20:02:37,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 2.297872340425532) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:37,284 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 597 transitions. [2023-12-02 20:02:37,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-12-02 20:02:37,285 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:02:37,285 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:02:37,289 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2023-12-02 20:02:37,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2023-12-02 20:02:37,485 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:02:37,486 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:02:37,486 INFO L85 PathProgramCache]: Analyzing trace with hash -420329754, now seen corresponding path program 11 times [2023-12-02 20:02:37,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:02:37,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526270632] [2023-12-02 20:02:37,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:02:37,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:02:37,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:02:38,757 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 36 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:02:38,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:02:38,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526270632] [2023-12-02 20:02:38,758 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526270632] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:02:38,758 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56389560] [2023-12-02 20:02:38,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:02:38,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:02:38,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:02:38,759 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:02:38,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-12-02 20:02:38,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 20:02:38,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:02:38,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 77 conjunts are in the unsatisfiable core [2023-12-02 20:02:38,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:02:38,960 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:02:39,433 INFO L378 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 [2023-12-02 20:02:39,485 INFO L378 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 [2023-12-02 20:02:39,898 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 9 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:02:39,898 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:02:39,923 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_972 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_972) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 8 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 20:02:39,929 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:02:39,929 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 20:02:39,935 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:02:39,936 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 20:02:40,117 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 9 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:02:40,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [56389560] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:02:40,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [346373869] [2023-12-02 20:02:40,119 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:02:40,119 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:02:40,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:02:40,119 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:02:40,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:02:40,760 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:02:41,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21578#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:02:41,790 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:02:41,790 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:02:41,791 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 24, 24] total 48 [2023-12-02 20:02:41,791 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738574047] [2023-12-02 20:02:41,791 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:02:41,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 20:02:41,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:02:41,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 20:02:41,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2935, Unknown=1, NotChecked=108, Total=3192 [2023-12-02 20:02:41,792 INFO L87 Difference]: Start difference. First operand 524 states and 597 transitions. Second operand has 48 states, 48 states have (on average 1.8125) internal successors, (87), 48 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:48,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:02:48,013 INFO L93 Difference]: Finished difference Result 1212 states and 1338 transitions. [2023-12-02 20:02:48,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-12-02 20:02:48,014 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.8125) internal successors, (87), 48 states have internal predecessors, (87), 0 states have call successors, (0), 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 41 [2023-12-02 20:02:48,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:02:48,020 INFO L225 Difference]: With dead ends: 1212 [2023-12-02 20:02:48,020 INFO L226 Difference]: Without dead ends: 1136 [2023-12-02 20:02:48,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2199 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=760, Invalid=11015, Unknown=1, NotChecked=214, Total=11990 [2023-12-02 20:02:48,021 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 909 mSDsluCounter, 1448 mSDsCounter, 0 mSdLazyCounter, 3604 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 909 SdHoareTripleChecker+Valid, 1495 SdHoareTripleChecker+Invalid, 3939 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 3604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 280 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:02:48,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [909 Valid, 1495 Invalid, 3939 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 3604 Invalid, 0 Unknown, 280 Unchecked, 2.0s Time] [2023-12-02 20:02:48,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1136 states. [2023-12-02 20:02:48,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1136 to 603. [2023-12-02 20:02:48,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 599 states have (on average 1.1469115191986645) internal successors, (687), 602 states have internal predecessors, (687), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:48,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 687 transitions. [2023-12-02 20:02:48,033 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 687 transitions. Word has length 41 [2023-12-02 20:02:48,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:02:48,033 INFO L495 AbstractCegarLoop]: Abstraction has 603 states and 687 transitions. [2023-12-02 20:02:48,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.8125) internal successors, (87), 48 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:02:48,034 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 687 transitions. [2023-12-02 20:02:48,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 20:02:48,035 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:02:48,035 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:02:48,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2023-12-02 20:02:48,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2023-12-02 20:02:48,236 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:02:48,236 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:02:48,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1672423773, now seen corresponding path program 3 times [2023-12-02 20:02:48,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:02:48,236 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242233528] [2023-12-02 20:02:48,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:02:48,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:02:48,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:02:49,144 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 4 proven. 43 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:49,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:02:49,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242233528] [2023-12-02 20:02:49,144 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242233528] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:02:49,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500084254] [2023-12-02 20:02:49,144 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:02:49,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:02:49,145 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:02:49,145 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:02:49,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-12-02 20:02:49,316 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:02:49,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:02:49,319 INFO L262 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 73 conjunts are in the unsatisfiable core [2023-12-02 20:02:49,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:02:49,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:02:49,328 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:02:49,331 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:02:50,253 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:50,253 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:02:51,266 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:02:51,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500084254] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:02:51,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149879113] [2023-12-02 20:02:51,268 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:02:51,268 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:02:51,268 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:02:51,268 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:02:51,268 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:02:52,352 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:02:54,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23807#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:02:54,243 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:02:54,243 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:02:54,243 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 18] total 52 [2023-12-02 20:02:54,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522251058] [2023-12-02 20:02:54,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:02:54,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 20:02:54,244 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:02:54,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 20:02:54,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=4155, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 20:02:54,244 INFO L87 Difference]: Start difference. First operand 603 states and 687 transitions. Second operand has 53 states, 52 states have (on average 2.269230769230769) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:03,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:03:03,969 INFO L93 Difference]: Finished difference Result 1276 states and 1408 transitions. [2023-12-02 20:03:03,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2023-12-02 20:03:03,969 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.269230769230769) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 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 42 [2023-12-02 20:03:03,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:03:03,975 INFO L225 Difference]: With dead ends: 1276 [2023-12-02 20:03:03,975 INFO L226 Difference]: Without dead ends: 1272 [2023-12-02 20:03:03,976 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7196 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=2479, Invalid=21391, Unknown=0, NotChecked=0, Total=23870 [2023-12-02 20:03:03,976 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 531 mSDsluCounter, 410 mSDsCounter, 0 mSdLazyCounter, 2084 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 2163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 2084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:03:03,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [531 Valid, 427 Invalid, 2163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 2084 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 20:03:03,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1272 states. [2023-12-02 20:03:03,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1272 to 641. [2023-12-02 20:03:03,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 641 states, 637 states have (on average 1.139717425431711) internal successors, (726), 640 states have internal predecessors, (726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:03,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 641 states to 641 states and 726 transitions. [2023-12-02 20:03:03,993 INFO L78 Accepts]: Start accepts. Automaton has 641 states and 726 transitions. Word has length 42 [2023-12-02 20:03:03,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:03:03,993 INFO L495 AbstractCegarLoop]: Abstraction has 641 states and 726 transitions. [2023-12-02 20:03:03,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.269230769230769) internal successors, (118), 53 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:03,993 INFO L276 IsEmpty]: Start isEmpty. Operand 641 states and 726 transitions. [2023-12-02 20:03:03,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-12-02 20:03:03,995 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:03:03,995 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:03:04,001 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2023-12-02 20:03:04,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2023-12-02 20:03:04,196 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:03:04,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:03:04,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1672432809, now seen corresponding path program 2 times [2023-12-02 20:03:04,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:03:04,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7565572] [2023-12-02 20:03:04,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:03:04,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:03:04,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:03:05,376 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:03:05,376 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:03:05,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7565572] [2023-12-02 20:03:05,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7565572] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:03:05,376 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259765949] [2023-12-02 20:03:05,376 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:03:05,376 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:05,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:03:05,377 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:03:05,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-12-02 20:03:05,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 20:03:05,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:03:05,700 INFO L262 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 65 conjunts are in the unsatisfiable core [2023-12-02 20:03:05,702 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:03:05,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:03:05,749 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:03:05,755 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:03:07,595 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 9 proven. 40 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:03:07,595 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:03:09,481 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:03:09,576 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 16 proven. 33 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:03:09,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259765949] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:03:09,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1925900629] [2023-12-02 20:03:09,578 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:03:09,578 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:03:09,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:03:09,578 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:03:09,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:03:10,609 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:03:13,285 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26221#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:03:13,285 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:03:13,285 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:03:13,286 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20, 21] total 59 [2023-12-02 20:03:13,286 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777857558] [2023-12-02 20:03:13,286 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:03:13,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-12-02 20:03:13,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:03:13,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-12-02 20:03:13,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=5295, Unknown=0, NotChecked=0, Total=5700 [2023-12-02 20:03:13,288 INFO L87 Difference]: Start difference. First operand 641 states and 726 transitions. Second operand has 61 states, 60 states have (on average 2.0) internal successors, (120), 60 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:30,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:03:30,237 INFO L93 Difference]: Finished difference Result 1030 states and 1129 transitions. [2023-12-02 20:03:30,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2023-12-02 20:03:30,238 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 2.0) internal successors, (120), 60 states have internal predecessors, (120), 0 states have call successors, (0), 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 42 [2023-12-02 20:03:30,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:03:30,242 INFO L225 Difference]: With dead ends: 1030 [2023-12-02 20:03:30,242 INFO L226 Difference]: Without dead ends: 1000 [2023-12-02 20:03:30,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6990 ImplicationChecksByTransitivity, 20.5s TimeCoverageRelationStatistics Valid=3867, Invalid=21573, Unknown=0, NotChecked=0, Total=25440 [2023-12-02 20:03:30,244 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 876 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 2040 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 876 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 2116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 2040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:03:30,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [876 Valid, 195 Invalid, 2116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 2040 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-12-02 20:03:30,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2023-12-02 20:03:30,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 624. [2023-12-02 20:03:30,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 624 states, 620 states have (on average 1.1451612903225807) internal successors, (710), 623 states have internal predecessors, (710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:30,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 624 states to 624 states and 710 transitions. [2023-12-02 20:03:30,253 INFO L78 Accepts]: Start accepts. Automaton has 624 states and 710 transitions. Word has length 42 [2023-12-02 20:03:30,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:03:30,253 INFO L495 AbstractCegarLoop]: Abstraction has 624 states and 710 transitions. [2023-12-02 20:03:30,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 2.0) internal successors, (120), 60 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:30,254 INFO L276 IsEmpty]: Start isEmpty. Operand 624 states and 710 transitions. [2023-12-02 20:03:30,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-12-02 20:03:30,255 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:03:30,255 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:03:30,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2023-12-02 20:03:30,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:30,456 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:03:30,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:03:30,456 INFO L85 PathProgramCache]: Analyzing trace with hash -688052451, now seen corresponding path program 8 times [2023-12-02 20:03:30,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:03:30,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085231929] [2023-12-02 20:03:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:03:30,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:03:30,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:03:31,672 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:31,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:03:31,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085231929] [2023-12-02 20:03:31,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085231929] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:03:31,673 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784219467] [2023-12-02 20:03:31,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:03:31,673 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:31,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:03:31,674 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:03:31,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-12-02 20:03:32,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 20:03:32,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:03:32,021 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 100 conjunts are in the unsatisfiable core [2023-12-02 20:03:32,025 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:03:32,035 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:03:32,496 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:03:32,612 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:03:32,726 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:03:32,854 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:03:32,937 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 12 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:32,938 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:03:33,104 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1135 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1135) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ 2 |c_ULTIMATE.start_cstrncat_~s2#1.offset|)) 0)) is different from false [2023-12-02 20:03:33,190 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:33,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-12-02 20:03:33,196 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:33,196 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2023-12-02 20:03:33,202 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-12-02 20:03:33,690 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 21 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 15 not checked. [2023-12-02 20:03:33,690 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784219467] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:03:33,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1357365148] [2023-12-02 20:03:33,692 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:03:33,692 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:03:33,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:03:33,692 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:03:33,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:03:34,583 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:03:37,786 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28361#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:03:37,786 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:03:37,786 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:03:37,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 18] total 51 [2023-12-02 20:03:37,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518506756] [2023-12-02 20:03:37,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:03:37,787 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 20:03:37,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:03:37,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 20:03:37,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=3825, Unknown=36, NotChecked=126, Total=4290 [2023-12-02 20:03:37,787 INFO L87 Difference]: Start difference. First operand 624 states and 710 transitions. Second operand has 51 states, 51 states have (on average 2.215686274509804) internal successors, (113), 51 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:39,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:03:39,606 INFO L93 Difference]: Finished difference Result 669 states and 752 transitions. [2023-12-02 20:03:39,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-12-02 20:03:39,607 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.215686274509804) internal successors, (113), 51 states have internal predecessors, (113), 0 states have call successors, (0), 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 43 [2023-12-02 20:03:39,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:03:39,609 INFO L225 Difference]: With dead ends: 669 [2023-12-02 20:03:39,609 INFO L226 Difference]: Without dead ends: 609 [2023-12-02 20:03:39,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1889 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=744, Invalid=7230, Unknown=40, NotChecked=176, Total=8190 [2023-12-02 20:03:39,610 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 248 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 799 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 248 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 888 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 799 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 20:03:39,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [248 Valid, 228 Invalid, 888 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 799 Invalid, 0 Unknown, 72 Unchecked, 0.5s Time] [2023-12-02 20:03:39,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2023-12-02 20:03:39,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 605. [2023-12-02 20:03:39,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 605 states, 601 states have (on average 1.1447587354409319) internal successors, (688), 604 states have internal predecessors, (688), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:39,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 688 transitions. [2023-12-02 20:03:39,619 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 688 transitions. Word has length 43 [2023-12-02 20:03:39,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:03:39,620 INFO L495 AbstractCegarLoop]: Abstraction has 605 states and 688 transitions. [2023-12-02 20:03:39,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.215686274509804) internal successors, (113), 51 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:39,620 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 688 transitions. [2023-12-02 20:03:39,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 20:03:39,621 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:03:39,621 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:03:39,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2023-12-02 20:03:39,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:39,821 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:03:39,822 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:03:39,822 INFO L85 PathProgramCache]: Analyzing trace with hash 510096409, now seen corresponding path program 12 times [2023-12-02 20:03:39,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:03:39,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123077737] [2023-12-02 20:03:39,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:03:39,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:03:39,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:03:40,894 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 49 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:40,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:03:40,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123077737] [2023-12-02 20:03:40,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123077737] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:03:40,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530018720] [2023-12-02 20:03:40,895 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:03:40,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:40,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:03:40,896 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:03:40,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-12-02 20:03:41,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:03:41,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:03:41,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 83 conjunts are in the unsatisfiable core [2023-12-02 20:03:41,073 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:03:41,077 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:03:41,503 INFO L378 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 [2023-12-02 20:03:41,547 INFO L378 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 [2023-12-02 20:03:41,966 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 10 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:41,966 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:03:42,091 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:42,091 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 20:03:42,097 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:42,097 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 20:03:42,284 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 10 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:42,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530018720] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:03:42,285 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [465773379] [2023-12-02 20:03:42,285 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:03:42,285 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:03:42,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:03:42,286 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:03:42,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:03:42,920 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:03:44,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30016#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:03:44,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:03:44,223 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:03:44,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 26, 26] total 52 [2023-12-02 20:03:44,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304861769] [2023-12-02 20:03:44,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:03:44,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-12-02 20:03:44,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:03:44,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-12-02 20:03:44,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3479, Unknown=16, NotChecked=0, Total=3660 [2023-12-02 20:03:44,225 INFO L87 Difference]: Start difference. First operand 605 states and 688 transitions. Second operand has 52 states, 52 states have (on average 1.8269230769230769) internal successors, (95), 52 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:52,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:03:52,095 INFO L93 Difference]: Finished difference Result 1359 states and 1498 transitions. [2023-12-02 20:03:52,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 20:03:52,096 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.8269230769230769) internal successors, (95), 52 states have internal predecessors, (95), 0 states have call successors, (0), 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 45 [2023-12-02 20:03:52,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:03:52,103 INFO L225 Difference]: With dead ends: 1359 [2023-12-02 20:03:52,103 INFO L226 Difference]: Without dead ends: 1279 [2023-12-02 20:03:52,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2704 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=857, Invalid=13169, Unknown=16, NotChecked=0, Total=14042 [2023-12-02 20:03:52,104 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 1059 mSDsluCounter, 1797 mSDsCounter, 0 mSdLazyCounter, 4471 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1059 SdHoareTripleChecker+Valid, 1847 SdHoareTripleChecker+Invalid, 4534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 4471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:03:52,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1059 Valid, 1847 Invalid, 4534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 4471 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-12-02 20:03:52,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1279 states. [2023-12-02 20:03:52,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1279 to 686. [2023-12-02 20:03:52,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 686 states, 682 states have (on average 1.1451612903225807) internal successors, (781), 685 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:52,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 686 states to 686 states and 781 transitions. [2023-12-02 20:03:52,121 INFO L78 Accepts]: Start accepts. Automaton has 686 states and 781 transitions. Word has length 45 [2023-12-02 20:03:52,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:03:52,121 INFO L495 AbstractCegarLoop]: Abstraction has 686 states and 781 transitions. [2023-12-02 20:03:52,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.8269230769230769) internal successors, (95), 52 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:03:52,122 INFO L276 IsEmpty]: Start isEmpty. Operand 686 states and 781 transitions. [2023-12-02 20:03:52,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 20:03:52,123 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:03:52,124 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:03:52,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-12-02 20:03:52,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:52,324 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:03:52,324 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:03:52,325 INFO L85 PathProgramCache]: Analyzing trace with hash 32011095, now seen corresponding path program 9 times [2023-12-02 20:03:52,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:03:52,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641657331] [2023-12-02 20:03:52,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:03:52,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:03:52,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:03:53,592 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:03:53,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:03:53,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641657331] [2023-12-02 20:03:53,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641657331] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:03:53,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585026578] [2023-12-02 20:03:53,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:03:53,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:03:53,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:03:53,593 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:03:53,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-12-02 20:03:53,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:03:53,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:03:53,844 INFO L262 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 80 conjunts are in the unsatisfiable core [2023-12-02 20:03:53,847 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:03:54,055 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:03:54,271 INFO L349 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-12-02 20:03:54,271 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 45 [2023-12-02 20:03:54,475 INFO L378 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 24 treesize of output 17 [2023-12-02 20:03:54,560 INFO L378 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 24 treesize of output 17 [2023-12-02 20:03:54,664 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 12 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 20:03:54,664 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:03:54,677 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1254 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1254) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2023-12-02 20:03:54,798 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1254 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1254) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ 2 |c_ULTIMATE.start_cstrncat_~s2#1.offset|)) 0)) is different from false [2023-12-02 20:03:55,331 INFO L349 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2023-12-02 20:03:55,331 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 71 treesize of output 87 [2023-12-02 20:03:55,344 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:55,344 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 51 [2023-12-02 20:03:55,353 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:03:55,381 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2023-12-02 20:03:55,410 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:03:55,410 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 55 [2023-12-02 20:03:55,800 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 17 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 12 not checked. [2023-12-02 20:03:55,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1585026578] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:03:55,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1073227471] [2023-12-02 20:03:55,801 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:03:55,802 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:03:55,802 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:03:55,802 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:03:55,802 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:03:56,742 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:03:59,802 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32508#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:03:59,803 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:03:59,803 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:03:59,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 22, 22] total 58 [2023-12-02 20:03:59,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960273758] [2023-12-02 20:03:59,803 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:03:59,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-12-02 20:03:59,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:03:59,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-12-02 20:03:59,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=4613, Unknown=40, NotChecked=278, Total=5256 [2023-12-02 20:03:59,804 INFO L87 Difference]: Start difference. First operand 686 states and 781 transitions. Second operand has 58 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 58 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:01,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:01,926 INFO L93 Difference]: Finished difference Result 1230 states and 1367 transitions. [2023-12-02 20:04:01,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 20:04:01,926 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 58 states have internal predecessors, (107), 0 states have call successors, (0), 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 45 [2023-12-02 20:04:01,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:01,930 INFO L225 Difference]: With dead ends: 1230 [2023-12-02 20:04:01,930 INFO L226 Difference]: Without dead ends: 903 [2023-12-02 20:04:01,931 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 2633 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=922, Invalid=9757, Unknown=41, NotChecked=410, Total=11130 [2023-12-02 20:04:01,931 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 340 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 1170 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 340 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 1400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 198 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:01,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [340 Valid, 298 Invalid, 1400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1170 Invalid, 0 Unknown, 198 Unchecked, 0.6s Time] [2023-12-02 20:04:01,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2023-12-02 20:04:01,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 798. [2023-12-02 20:04:01,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 794 states have (on average 1.1423173803526447) internal successors, (907), 797 states have internal predecessors, (907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:01,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 907 transitions. [2023-12-02 20:04:01,942 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 907 transitions. Word has length 45 [2023-12-02 20:04:01,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:01,942 INFO L495 AbstractCegarLoop]: Abstraction has 798 states and 907 transitions. [2023-12-02 20:04:01,942 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.8448275862068966) internal successors, (107), 58 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:01,942 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 907 transitions. [2023-12-02 20:04:01,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 20:04:01,943 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:01,943 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:04:01,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-12-02 20:04:02,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:02,144 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:04:02,144 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:02,144 INFO L85 PathProgramCache]: Analyzing trace with hash 1629301523, now seen corresponding path program 3 times [2023-12-02 20:04:02,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:02,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026078409] [2023-12-02 20:04:02,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:02,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:02,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:03,148 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 14 proven. 34 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:04:03,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:03,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026078409] [2023-12-02 20:04:03,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026078409] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:03,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520676059] [2023-12-02 20:04:03,148 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:04:03,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:03,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:03,149 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:03,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-12-02 20:04:03,366 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:04:03,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:04:03,370 INFO L262 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 20:04:03,372 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:04:03,428 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:04:03,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:04:03,433 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:04:04,751 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:04:04,752 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:04:06,558 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:04:06,636 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 9 proven. 39 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:04:06,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520676059] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:04:06,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624442366] [2023-12-02 20:04:06,638 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:04:06,638 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:04:06,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:04:06,639 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:04:06,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:04:07,507 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:04:10,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34950#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:04:10,035 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:04:10,035 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:04:10,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 22, 23] total 64 [2023-12-02 20:04:10,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076246791] [2023-12-02 20:04:10,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:04:10,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-12-02 20:04:10,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:04:10,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-12-02 20:04:10,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=511, Invalid=5969, Unknown=0, NotChecked=0, Total=6480 [2023-12-02 20:04:10,036 INFO L87 Difference]: Start difference. First operand 798 states and 907 transitions. Second operand has 66 states, 65 states have (on average 1.8923076923076922) internal successors, (123), 65 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:17,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:17,336 INFO L93 Difference]: Finished difference Result 1093 states and 1211 transitions. [2023-12-02 20:04:17,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2023-12-02 20:04:17,337 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.8923076923076922) internal successors, (123), 65 states have internal predecessors, (123), 0 states have call successors, (0), 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 45 [2023-12-02 20:04:17,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:17,340 INFO L225 Difference]: With dead ends: 1093 [2023-12-02 20:04:17,340 INFO L226 Difference]: Without dead ends: 1057 [2023-12-02 20:04:17,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5821 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=2503, Invalid=16679, Unknown=0, NotChecked=0, Total=19182 [2023-12-02 20:04:17,341 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 622 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 2012 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 622 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 2079 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:17,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [622 Valid, 225 Invalid, 2079 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2012 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 20:04:17,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1057 states. [2023-12-02 20:04:17,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1057 to 764. [2023-12-02 20:04:17,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 764 states, 760 states have (on average 1.1460526315789474) internal successors, (871), 763 states have internal predecessors, (871), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:17,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 764 states to 764 states and 871 transitions. [2023-12-02 20:04:17,350 INFO L78 Accepts]: Start accepts. Automaton has 764 states and 871 transitions. Word has length 45 [2023-12-02 20:04:17,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:17,351 INFO L495 AbstractCegarLoop]: Abstraction has 764 states and 871 transitions. [2023-12-02 20:04:17,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 1.8923076923076922) internal successors, (123), 65 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:17,351 INFO L276 IsEmpty]: Start isEmpty. Operand 764 states and 871 transitions. [2023-12-02 20:04:17,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-12-02 20:04:17,352 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:17,352 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:04:17,357 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2023-12-02 20:04:17,553 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:17,553 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:04:17,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:17,553 INFO L85 PathProgramCache]: Analyzing trace with hash -2024455600, now seen corresponding path program 4 times [2023-12-02 20:04:17,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:17,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038115962] [2023-12-02 20:04:17,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:17,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:17,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:18,547 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 4 proven. 62 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:04:18,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:18,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038115962] [2023-12-02 20:04:18,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038115962] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:18,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673097360] [2023-12-02 20:04:18,548 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:04:18,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:18,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:18,549 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:18,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2023-12-02 20:04:18,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:18,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 74 conjunts are in the unsatisfiable core [2023-12-02 20:04:18,693 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:04:18,706 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:04:18,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:04:18,710 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:04:19,812 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:04:19,813 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:04:21,225 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:04:21,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673097360] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:04:21,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1960056800] [2023-12-02 20:04:21,227 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:04:21,227 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:04:21,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:04:21,227 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:04:21,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:04:22,126 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:04:24,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37268#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:04:24,448 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:04:24,448 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:04:24,448 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 59 [2023-12-02 20:04:24,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943973655] [2023-12-02 20:04:24,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:04:24,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-12-02 20:04:24,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:04:24,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-12-02 20:04:24,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=5106, Unknown=0, NotChecked=0, Total=5402 [2023-12-02 20:04:24,450 INFO L87 Difference]: Start difference. First operand 764 states and 871 transitions. Second operand has 60 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 60 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:37,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:37,311 INFO L93 Difference]: Finished difference Result 1517 states and 1684 transitions. [2023-12-02 20:04:37,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2023-12-02 20:04:37,312 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 60 states have internal predecessors, (130), 0 states have call successors, (0), 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 46 [2023-12-02 20:04:37,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:37,316 INFO L225 Difference]: With dead ends: 1517 [2023-12-02 20:04:37,316 INFO L226 Difference]: Without dead ends: 1487 [2023-12-02 20:04:37,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7617 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=2831, Invalid=28321, Unknown=0, NotChecked=0, Total=31152 [2023-12-02 20:04:37,318 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 669 mSDsluCounter, 533 mSDsCounter, 0 mSdLazyCounter, 2742 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 669 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 2821 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 2742 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:37,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [669 Valid, 552 Invalid, 2821 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 2742 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 20:04:37,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1487 states. [2023-12-02 20:04:37,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1487 to 749. [2023-12-02 20:04:37,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 749 states, 745 states have (on average 1.1449664429530202) internal successors, (853), 748 states have internal predecessors, (853), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:37,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 749 states to 749 states and 853 transitions. [2023-12-02 20:04:37,328 INFO L78 Accepts]: Start accepts. Automaton has 749 states and 853 transitions. Word has length 46 [2023-12-02 20:04:37,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:37,328 INFO L495 AbstractCegarLoop]: Abstraction has 749 states and 853 transitions. [2023-12-02 20:04:37,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 60 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:37,329 INFO L276 IsEmpty]: Start isEmpty. Operand 749 states and 853 transitions. [2023-12-02 20:04:37,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-12-02 20:04:37,329 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:37,330 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:04:37,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2023-12-02 20:04:37,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:37,530 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:04:37,530 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:37,530 INFO L85 PathProgramCache]: Analyzing trace with hash -416633017, now seen corresponding path program 10 times [2023-12-02 20:04:37,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:37,531 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299303593] [2023-12-02 20:04:37,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:37,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:37,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:37,884 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 54 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 20:04:37,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:37,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299303593] [2023-12-02 20:04:37,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299303593] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:37,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505757061] [2023-12-02 20:04:37,884 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:04:37,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:37,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:37,885 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:37,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2023-12-02 20:04:38,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:38,042 INFO L262 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 51 conjunts are in the unsatisfiable core [2023-12-02 20:04:38,044 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:04:38,209 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 20:04:38,209 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:04:38,461 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 20:04:38,534 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 9 proven. 49 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 20:04:38,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505757061] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:04:38,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821646554] [2023-12-02 20:04:38,535 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:04:38,535 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:04:38,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:04:38,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:04:38,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:04:39,433 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:04:41,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40059#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:04:41,572 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:04:41,572 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:04:41,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 28 [2023-12-02 20:04:41,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164104086] [2023-12-02 20:04:41,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:04:41,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 20:04:41,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:04:41,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 20:04:41,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1707, Unknown=1, NotChecked=0, Total=1892 [2023-12-02 20:04:41,573 INFO L87 Difference]: Start difference. First operand 749 states and 853 transitions. Second operand has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:42,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:42,108 INFO L93 Difference]: Finished difference Result 848 states and 944 transitions. [2023-12-02 20:04:42,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 20:04:42,108 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 0 states have call successors, (0), 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 47 [2023-12-02 20:04:42,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:42,111 INFO L225 Difference]: With dead ends: 848 [2023-12-02 20:04:42,111 INFO L226 Difference]: Without dead ends: 848 [2023-12-02 20:04:42,112 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 106 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 970 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=334, Invalid=2971, Unknown=1, NotChecked=0, Total=3306 [2023-12-02 20:04:42,112 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 159 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:42,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 270 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 20:04:42,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2023-12-02 20:04:42,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 800. [2023-12-02 20:04:42,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 800 states, 796 states have (on average 1.1369346733668342) internal successors, (905), 799 states have internal predecessors, (905), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 800 states to 800 states and 905 transitions. [2023-12-02 20:04:42,120 INFO L78 Accepts]: Start accepts. Automaton has 800 states and 905 transitions. Word has length 47 [2023-12-02 20:04:42,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:42,121 INFO L495 AbstractCegarLoop]: Abstraction has 800 states and 905 transitions. [2023-12-02 20:04:42,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 3.107142857142857) internal successors, (87), 29 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 800 states and 905 transitions. [2023-12-02 20:04:42,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 20:04:42,122 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:42,122 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:04:42,128 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2023-12-02 20:04:42,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2023-12-02 20:04:42,323 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:04:42,323 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:42,323 INFO L85 PathProgramCache]: Analyzing trace with hash 301036428, now seen corresponding path program 13 times [2023-12-02 20:04:42,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:42,323 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546738417] [2023-12-02 20:04:42,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:42,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:42,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:43,576 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 64 proven. 157 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:04:43,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:43,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546738417] [2023-12-02 20:04:43,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546738417] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:43,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340416624] [2023-12-02 20:04:43,577 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:04:43,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:43,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:43,578 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:43,579 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2023-12-02 20:04:43,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:43,741 INFO L262 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 89 conjunts are in the unsatisfiable core [2023-12-02 20:04:43,743 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:04:43,747 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:04:44,231 INFO L378 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 [2023-12-02 20:04:44,275 INFO L378 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 [2023-12-02 20:04:44,801 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:04:44,802 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:04:44,832 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1487 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1487) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 10 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 20:04:44,836 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:04:44,837 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 20:04:44,842 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:04:44,843 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 20:04:45,042 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 11 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:04:45,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340416624] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:04:45,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1183914638] [2023-12-02 20:04:45,043 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:04:45,043 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:04:45,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:04:45,044 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:04:45,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:04:45,690 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:04:46,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42094#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:04:46,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:04:46,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:04:46,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 28, 28] total 56 [2023-12-02 20:04:46,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530426521] [2023-12-02 20:04:46,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:04:46,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-12-02 20:04:46,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:04:46,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-12-02 20:04:46,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3856, Unknown=1, NotChecked=124, Total=4160 [2023-12-02 20:04:46,820 INFO L87 Difference]: Start difference. First operand 800 states and 905 transitions. Second operand has 56 states, 56 states have (on average 1.8392857142857142) internal successors, (103), 56 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:53,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:04:53,439 INFO L93 Difference]: Finished difference Result 1787 states and 1966 transitions. [2023-12-02 20:04:53,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2023-12-02 20:04:53,439 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.8392857142857142) internal successors, (103), 56 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2023-12-02 20:04:53,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:04:53,445 INFO L225 Difference]: With dead ends: 1787 [2023-12-02 20:04:53,445 INFO L226 Difference]: Without dead ends: 1689 [2023-12-02 20:04:53,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3037 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=890, Invalid=14863, Unknown=1, NotChecked=248, Total=16002 [2023-12-02 20:04:53,446 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 940 mSDsluCounter, 2039 mSDsCounter, 0 mSdLazyCounter, 5072 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 940 SdHoareTripleChecker+Valid, 2092 SdHoareTripleChecker+Invalid, 5466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 5072 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 327 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-12-02 20:04:53,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [940 Valid, 2092 Invalid, 5466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 5072 Invalid, 0 Unknown, 327 Unchecked, 2.3s Time] [2023-12-02 20:04:53,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1689 states. [2023-12-02 20:04:53,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1689 to 899. [2023-12-02 20:04:53,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 899 states, 895 states have (on average 1.1363128491620111) internal successors, (1017), 898 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:53,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 899 states to 899 states and 1017 transitions. [2023-12-02 20:04:53,459 INFO L78 Accepts]: Start accepts. Automaton has 899 states and 1017 transitions. Word has length 49 [2023-12-02 20:04:53,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:04:53,459 INFO L495 AbstractCegarLoop]: Abstraction has 899 states and 1017 transitions. [2023-12-02 20:04:53,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.8392857142857142) internal successors, (103), 56 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:04:53,459 INFO L276 IsEmpty]: Start isEmpty. Operand 899 states and 1017 transitions. [2023-12-02 20:04:53,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 20:04:53,460 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:04:53,460 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:04:53,466 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2023-12-02 20:04:53,661 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2023-12-02 20:04:53,661 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:04:53,661 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:04:53,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1817410627, now seen corresponding path program 5 times [2023-12-02 20:04:53,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:04:53,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081583723] [2023-12-02 20:04:53,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:04:53,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:04:53,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:04:54,680 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 4 proven. 85 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:04:54,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:04:54,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081583723] [2023-12-02 20:04:54,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081583723] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:04:54,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85747866] [2023-12-02 20:04:54,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:04:54,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:04:54,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:04:54,682 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:04:54,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2023-12-02 20:04:55,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 20:04:55,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:04:55,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 98 conjunts are in the unsatisfiable core [2023-12-02 20:04:55,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:04:55,387 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-12-02 20:04:55,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 11 [2023-12-02 20:04:58,439 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 4 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:04:58,440 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:05:00,919 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 36 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:00,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85747866] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:05:00,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2115498172] [2023-12-02 20:05:00,921 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:05:00,921 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:05:00,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:05:00,921 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:05:00,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:05:01,782 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:05:04,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45285#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:05:04,090 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:05:04,090 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:05:04,090 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 28, 27] total 77 [2023-12-02 20:05:04,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237733814] [2023-12-02 20:05:04,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:05:04,090 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2023-12-02 20:05:04,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:05:04,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2023-12-02 20:05:04,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=7746, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 20:05:04,091 INFO L87 Difference]: Start difference. First operand 899 states and 1017 transitions. Second operand has 78 states, 77 states have (on average 1.9090909090909092) internal successors, (147), 78 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:26,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:05:26,836 INFO L93 Difference]: Finished difference Result 1499 states and 1645 transitions. [2023-12-02 20:05:26,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2023-12-02 20:05:26,836 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.9090909090909092) internal successors, (147), 78 states have internal predecessors, (147), 0 states have call successors, (0), 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 50 [2023-12-02 20:05:26,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:05:26,842 INFO L225 Difference]: With dead ends: 1499 [2023-12-02 20:05:26,842 INFO L226 Difference]: Without dead ends: 1493 [2023-12-02 20:05:26,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13901 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=6329, Invalid=45427, Unknown=0, NotChecked=0, Total=51756 [2023-12-02 20:05:26,844 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1391 mSDsluCounter, 605 mSDsCounter, 0 mSdLazyCounter, 3535 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1391 SdHoareTripleChecker+Valid, 624 SdHoareTripleChecker+Invalid, 3640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 3535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:05:26,844 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1391 Valid, 624 Invalid, 3640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 3535 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2023-12-02 20:05:26,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1493 states. [2023-12-02 20:05:26,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1493 to 959. [2023-12-02 20:05:26,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 959 states, 955 states have (on average 1.131937172774869) internal successors, (1081), 958 states have internal predecessors, (1081), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:26,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 959 states to 959 states and 1081 transitions. [2023-12-02 20:05:26,854 INFO L78 Accepts]: Start accepts. Automaton has 959 states and 1081 transitions. Word has length 50 [2023-12-02 20:05:26,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:05:26,855 INFO L495 AbstractCegarLoop]: Abstraction has 959 states and 1081 transitions. [2023-12-02 20:05:26,855 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 1.9090909090909092) internal successors, (147), 78 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:26,855 INFO L276 IsEmpty]: Start isEmpty. Operand 959 states and 1081 transitions. [2023-12-02 20:05:26,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 20:05:26,856 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:05:26,856 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:05:26,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2023-12-02 20:05:27,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2023-12-02 20:05:27,056 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:05:27,056 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:05:27,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1817419663, now seen corresponding path program 4 times [2023-12-02 20:05:27,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:05:27,057 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802804001] [2023-12-02 20:05:27,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:05:27,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:05:27,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:05:28,222 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 20 proven. 71 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:05:28,222 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:05:28,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802804001] [2023-12-02 20:05:28,222 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802804001] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:05:28,222 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [550423246] [2023-12-02 20:05:28,222 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:05:28,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:05:28,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:05:28,223 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:05:28,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2023-12-02 20:05:28,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:05:28,380 INFO L262 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 82 conjunts are in the unsatisfiable core [2023-12-02 20:05:28,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:05:28,430 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:05:28,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:05:28,434 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:05:29,753 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 25 proven. 66 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:05:29,753 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:05:31,611 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:05:31,683 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 36 proven. 55 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:05:31,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [550423246] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:05:31,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127129221] [2023-12-02 20:05:31,684 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:05:31,684 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:05:31,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:05:31,685 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:05:31,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:05:32,533 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:05:35,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48394#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:05:35,227 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:05:35,227 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:05:35,228 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 24] total 69 [2023-12-02 20:05:35,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639430529] [2023-12-02 20:05:35,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:05:35,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-12-02 20:05:35,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:05:35,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-12-02 20:05:35,229 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=6801, Unknown=0, NotChecked=0, Total=7310 [2023-12-02 20:05:35,229 INFO L87 Difference]: Start difference. First operand 959 states and 1081 transitions. Second operand has 71 states, 70 states have (on average 2.057142857142857) internal successors, (144), 70 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:43,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:05:43,134 INFO L93 Difference]: Finished difference Result 1585 states and 1724 transitions. [2023-12-02 20:05:43,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2023-12-02 20:05:43,134 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 2.057142857142857) internal successors, (144), 70 states have internal predecessors, (144), 0 states have call successors, (0), 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 50 [2023-12-02 20:05:43,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:05:43,139 INFO L225 Difference]: With dead ends: 1585 [2023-12-02 20:05:43,139 INFO L226 Difference]: Without dead ends: 1482 [2023-12-02 20:05:43,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7744 ImplicationChecksByTransitivity, 11.7s TimeCoverageRelationStatistics Valid=3313, Invalid=23093, Unknown=0, NotChecked=0, Total=26406 [2023-12-02 20:05:43,141 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 777 mSDsluCounter, 488 mSDsCounter, 0 mSdLazyCounter, 2998 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 777 SdHoareTripleChecker+Valid, 509 SdHoareTripleChecker+Invalid, 3087 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 2998 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:05:43,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [777 Valid, 509 Invalid, 3087 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 2998 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-12-02 20:05:43,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1482 states. [2023-12-02 20:05:43,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1482 to 998. [2023-12-02 20:05:43,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 998 states, 994 states have (on average 1.1297786720321932) internal successors, (1123), 997 states have internal predecessors, (1123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:43,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 998 states to 998 states and 1123 transitions. [2023-12-02 20:05:43,151 INFO L78 Accepts]: Start accepts. Automaton has 998 states and 1123 transitions. Word has length 50 [2023-12-02 20:05:43,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:05:43,151 INFO L495 AbstractCegarLoop]: Abstraction has 998 states and 1123 transitions. [2023-12-02 20:05:43,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 70 states have (on average 2.057142857142857) internal successors, (144), 70 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:43,152 INFO L276 IsEmpty]: Start isEmpty. Operand 998 states and 1123 transitions. [2023-12-02 20:05:43,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 20:05:43,153 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:05:43,153 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:05:43,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2023-12-02 20:05:43,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2023-12-02 20:05:43,353 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:05:43,353 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:05:43,353 INFO L85 PathProgramCache]: Analyzing trace with hash 543047472, now seen corresponding path program 11 times [2023-12-02 20:05:43,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:05:43,354 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851772997] [2023-12-02 20:05:43,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:05:43,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:05:43,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:05:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 26 proven. 71 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:44,514 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:05:44,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851772997] [2023-12-02 20:05:44,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1851772997] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:05:44,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113027941] [2023-12-02 20:05:44,515 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:05:44,515 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:05:44,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:05:44,516 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:05:44,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2023-12-02 20:05:45,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 20:05:45,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:05:45,058 INFO L262 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 115 conjunts are in the unsatisfiable core [2023-12-02 20:05:45,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:05:45,071 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:05:45,386 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:05:45,487 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:05:45,586 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:05:45,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:05:45,798 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:05:45,873 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 24 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:45,873 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:05:45,945 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1678 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1678) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2023-12-02 20:05:46,144 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 15 treesize of output 13 [2023-12-02 20:05:46,146 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 20:05:46,652 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 31 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 20 not checked. [2023-12-02 20:05:46,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113027941] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:05:46,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000439954] [2023-12-02 20:05:46,653 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:05:46,653 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:05:46,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:05:46,653 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:05:46,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:05:47,453 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:05:50,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51508#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:05:50,212 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:05:50,212 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:05:50,212 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 21] total 56 [2023-12-02 20:05:50,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431825445] [2023-12-02 20:05:50,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:05:50,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-12-02 20:05:50,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:05:50,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-12-02 20:05:50,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=4479, Unknown=25, NotChecked=136, Total=4970 [2023-12-02 20:05:50,213 INFO L87 Difference]: Start difference. First operand 998 states and 1123 transitions. Second operand has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:52,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:05:52,091 INFO L93 Difference]: Finished difference Result 1052 states and 1174 transitions. [2023-12-02 20:05:52,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-12-02 20:05:52,092 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 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 52 [2023-12-02 20:05:52,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:05:52,095 INFO L225 Difference]: With dead ends: 1052 [2023-12-02 20:05:52,095 INFO L226 Difference]: Without dead ends: 956 [2023-12-02 20:05:52,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2535 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=953, Invalid=9125, Unknown=26, NotChecked=198, Total=10302 [2023-12-02 20:05:52,096 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 294 mSDsluCounter, 310 mSDsCounter, 0 mSdLazyCounter, 1362 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 1463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 20:05:52,096 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 325 Invalid, 1463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1362 Invalid, 0 Unknown, 84 Unchecked, 0.6s Time] [2023-12-02 20:05:52,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2023-12-02 20:05:52,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 956. [2023-12-02 20:05:52,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 956 states, 952 states have (on average 1.129201680672269) internal successors, (1075), 955 states have internal predecessors, (1075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:52,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 956 states to 956 states and 1075 transitions. [2023-12-02 20:05:52,104 INFO L78 Accepts]: Start accepts. Automaton has 956 states and 1075 transitions. Word has length 52 [2023-12-02 20:05:52,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:05:52,104 INFO L495 AbstractCegarLoop]: Abstraction has 956 states and 1075 transitions. [2023-12-02 20:05:52,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:05:52,105 INFO L276 IsEmpty]: Start isEmpty. Operand 956 states and 1075 transitions. [2023-12-02 20:05:52,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 20:05:52,105 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:05:52,106 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:05:52,111 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2023-12-02 20:05:52,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2023-12-02 20:05:52,306 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:05:52,306 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:05:52,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1405302079, now seen corresponding path program 14 times [2023-12-02 20:05:52,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:05:52,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765958529] [2023-12-02 20:05:52,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:05:52,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:05:52,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:05:53,666 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 81 proven. 184 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:53,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:05:53,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765958529] [2023-12-02 20:05:53,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765958529] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:05:53,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147612039] [2023-12-02 20:05:53,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:05:53,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:05:53,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:05:53,667 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:05:53,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2023-12-02 20:05:53,962 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-12-02 20:05:53,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:05:53,965 INFO L262 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 95 conjunts are in the unsatisfiable core [2023-12-02 20:05:53,967 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:05:53,972 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:05:54,597 INFO L378 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 [2023-12-02 20:05:54,648 INFO L378 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 [2023-12-02 20:05:55,239 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 12 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:55,239 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:05:55,276 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1741 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_1741) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 11 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 20:05:55,282 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:05:55,282 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 20:05:55,287 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:05:55,288 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 20:05:55,508 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 12 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:05:55,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147612039] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:05:55,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [504140014] [2023-12-02 20:05:55,509 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:05:55,509 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:05:55,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:05:55,509 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:05:55,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:05:56,118 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:05:57,268 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53965#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:05:57,268 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:05:57,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:05:57,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 30, 30] total 60 [2023-12-02 20:05:57,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298528455] [2023-12-02 20:05:57,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:05:57,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-12-02 20:05:57,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:05:57,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-12-02 20:05:57,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=4363, Unknown=1, NotChecked=132, Total=4692 [2023-12-02 20:05:57,270 INFO L87 Difference]: Start difference. First operand 956 states and 1075 transitions. Second operand has 60 states, 60 states have (on average 1.85) internal successors, (111), 60 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:05,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:06:05,080 INFO L93 Difference]: Finished difference Result 2031 states and 2229 transitions. [2023-12-02 20:06:05,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 20:06:05,081 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.85) internal successors, (111), 60 states have internal predecessors, (111), 0 states have call successors, (0), 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 53 [2023-12-02 20:06:05,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:06:05,087 INFO L225 Difference]: With dead ends: 2031 [2023-12-02 20:06:05,087 INFO L226 Difference]: Without dead ends: 1929 [2023-12-02 20:06:05,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 3542 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=976, Invalid=17117, Unknown=1, NotChecked=266, Total=18360 [2023-12-02 20:06:05,088 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 1181 mSDsluCounter, 2369 mSDsCounter, 0 mSdLazyCounter, 5892 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1181 SdHoareTripleChecker+Valid, 2425 SdHoareTripleChecker+Invalid, 6316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 5892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 351 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-12-02 20:06:05,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1181 Valid, 2425 Invalid, 6316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 5892 Invalid, 0 Unknown, 351 Unchecked, 2.9s Time] [2023-12-02 20:06:05,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1929 states. [2023-12-02 20:06:05,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1929 to 1059. [2023-12-02 20:06:05,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1059 states, 1055 states have (on average 1.1308056872037915) internal successors, (1193), 1058 states have internal predecessors, (1193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:05,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1059 states to 1059 states and 1193 transitions. [2023-12-02 20:06:05,102 INFO L78 Accepts]: Start accepts. Automaton has 1059 states and 1193 transitions. Word has length 53 [2023-12-02 20:06:05,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:06:05,102 INFO L495 AbstractCegarLoop]: Abstraction has 1059 states and 1193 transitions. [2023-12-02 20:06:05,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.85) internal successors, (111), 60 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:05,103 INFO L276 IsEmpty]: Start isEmpty. Operand 1059 states and 1193 transitions. [2023-12-02 20:06:05,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 20:06:05,103 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:06:05,103 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:06:05,109 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2023-12-02 20:06:05,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:06:05,304 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:06:05,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:06:05,304 INFO L85 PathProgramCache]: Analyzing trace with hash 1259349177, now seen corresponding path program 5 times [2023-12-02 20:06:05,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:06:05,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910151939] [2023-12-02 20:06:05,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:06:05,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:06:05,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:06:06,540 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 18 proven. 64 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:06:06,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:06:06,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910151939] [2023-12-02 20:06:06,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910151939] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:06:06,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706042826] [2023-12-02 20:06:06,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:06:06,541 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:06:06,541 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:06:06,542 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:06:06,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2023-12-02 20:06:06,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 20:06:06,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:06:06,988 INFO L262 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 83 conjunts are in the unsatisfiable core [2023-12-02 20:06:06,991 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:06:07,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:06:07,052 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:06:07,058 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:06:09,399 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:06:09,400 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:06:11,260 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:06:11,356 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 25 proven. 57 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:06:11,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706042826] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:06:11,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1992410513] [2023-12-02 20:06:11,358 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:06:11,358 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:06:11,358 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:06:11,358 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:06:11,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:06:12,212 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:06:14,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57580#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:06:14,817 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:06:14,817 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:06:14,817 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 24, 22] total 68 [2023-12-02 20:06:14,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160628911] [2023-12-02 20:06:14,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:06:14,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2023-12-02 20:06:14,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:06:14,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2023-12-02 20:06:14,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=6660, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 20:06:14,819 INFO L87 Difference]: Start difference. First operand 1059 states and 1193 transitions. Second operand has 70 states, 69 states have (on average 2.1884057971014492) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:21,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:06:21,991 INFO L93 Difference]: Finished difference Result 1344 states and 1479 transitions. [2023-12-02 20:06:21,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2023-12-02 20:06:21,992 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 2.1884057971014492) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 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 53 [2023-12-02 20:06:21,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:06:21,996 INFO L225 Difference]: With dead ends: 1344 [2023-12-02 20:06:21,996 INFO L226 Difference]: Without dead ends: 1309 [2023-12-02 20:06:21,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4301 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=1879, Invalid=14891, Unknown=0, NotChecked=0, Total=16770 [2023-12-02 20:06:21,997 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 615 mSDsluCounter, 314 mSDsCounter, 0 mSdLazyCounter, 2601 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 615 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 2655 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 2601 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-12-02 20:06:21,997 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [615 Valid, 327 Invalid, 2655 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 2601 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-12-02 20:06:21,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1309 states. [2023-12-02 20:06:22,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1309 to 922. [2023-12-02 20:06:22,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 922 states, 918 states have (on average 1.1427015250544663) internal successors, (1049), 921 states have internal predecessors, (1049), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:22,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 922 states to 922 states and 1049 transitions. [2023-12-02 20:06:22,006 INFO L78 Accepts]: Start accepts. Automaton has 922 states and 1049 transitions. Word has length 53 [2023-12-02 20:06:22,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:06:22,006 INFO L495 AbstractCegarLoop]: Abstraction has 922 states and 1049 transitions. [2023-12-02 20:06:22,006 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 2.1884057971014492) internal successors, (151), 69 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:22,006 INFO L276 IsEmpty]: Start isEmpty. Operand 922 states and 1049 transitions. [2023-12-02 20:06:22,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 20:06:22,007 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:06:22,007 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:06:22,013 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2023-12-02 20:06:22,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2023-12-02 20:06:22,208 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:06:22,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:06:22,208 INFO L85 PathProgramCache]: Analyzing trace with hash -139875606, now seen corresponding path program 6 times [2023-12-02 20:06:22,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:06:22,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651798390] [2023-12-02 20:06:22,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:06:22,208 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:06:22,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:06:23,324 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 4 proven. 112 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:06:23,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:06:23,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651798390] [2023-12-02 20:06:23,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651798390] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:06:23,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555178344] [2023-12-02 20:06:23,324 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:06:23,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:06:23,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:06:23,325 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:06:23,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2023-12-02 20:06:23,571 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:06:23,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:06:23,575 INFO L262 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 105 conjunts are in the unsatisfiable core [2023-12-02 20:06:23,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:06:23,593 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-12-02 20:06:23,593 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 11 [2023-12-02 20:06:24,712 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:06:25,043 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:06:25,043 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 29 [2023-12-02 20:06:25,868 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:06:25,868 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:06:27,072 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 29 [2023-12-02 20:06:28,672 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:06:28,672 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555178344] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:06:28,672 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [123579796] [2023-12-02 20:06:28,673 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:06:28,673 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:06:28,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:06:28,673 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:06:28,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:06:29,566 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:06:32,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60350#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:06:32,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:06:32,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:06:32,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 28, 29] total 80 [2023-12-02 20:06:32,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638488853] [2023-12-02 20:06:32,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:06:32,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2023-12-02 20:06:32,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:06:32,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2023-12-02 20:06:32,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=8570, Unknown=0, NotChecked=0, Total=8930 [2023-12-02 20:06:32,128 INFO L87 Difference]: Start difference. First operand 922 states and 1049 transitions. Second operand has 81 states, 80 states have (on average 1.975) internal successors, (158), 81 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:54,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:06:54,633 INFO L93 Difference]: Finished difference Result 1737 states and 1930 transitions. [2023-12-02 20:06:54,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2023-12-02 20:06:54,633 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 1.975) internal successors, (158), 81 states have internal predecessors, (158), 0 states have call successors, (0), 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 54 [2023-12-02 20:06:54,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:06:54,639 INFO L225 Difference]: With dead ends: 1737 [2023-12-02 20:06:54,640 INFO L226 Difference]: Without dead ends: 1703 [2023-12-02 20:06:54,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10374 ImplicationChecksByTransitivity, 25.7s TimeCoverageRelationStatistics Valid=3586, Invalid=40304, Unknown=0, NotChecked=0, Total=43890 [2023-12-02 20:06:54,641 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 1282 mSDsluCounter, 931 mSDsCounter, 0 mSdLazyCounter, 5129 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1282 SdHoareTripleChecker+Valid, 953 SdHoareTripleChecker+Invalid, 5298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 5129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2023-12-02 20:06:54,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1282 Valid, 953 Invalid, 5298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 5129 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2023-12-02 20:06:54,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1703 states. [2023-12-02 20:06:54,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1703 to 908. [2023-12-02 20:06:54,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 904 states have (on average 1.1426991150442478) internal successors, (1033), 907 states have internal predecessors, (1033), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:54,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1033 transitions. [2023-12-02 20:06:54,653 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1033 transitions. Word has length 54 [2023-12-02 20:06:54,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:06:54,653 INFO L495 AbstractCegarLoop]: Abstraction has 908 states and 1033 transitions. [2023-12-02 20:06:54,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 1.975) internal successors, (158), 81 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:06:54,653 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1033 transitions. [2023-12-02 20:06:54,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 20:06:54,654 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:06:54,654 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:06:54,659 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2023-12-02 20:06:54,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:06:54,855 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:06:54,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:06:54,855 INFO L85 PathProgramCache]: Analyzing trace with hash 873206838, now seen corresponding path program 12 times [2023-12-02 20:06:54,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:06:54,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137728730] [2023-12-02 20:06:54,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:06:54,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:06:54,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:06:55,894 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:06:55,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:06:55,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137728730] [2023-12-02 20:06:55,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137728730] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:06:55,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328397543] [2023-12-02 20:06:55,894 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:06:55,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:06:55,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:06:55,895 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:06:55,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2023-12-02 20:06:56,166 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:06:56,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:06:56,169 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 95 conjunts are in the unsatisfiable core [2023-12-02 20:06:56,172 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:06:56,431 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:06:56,655 INFO L349 Elim1Store]: treesize reduction 12, result has 60.0 percent of original size [2023-12-02 20:06:56,655 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 45 [2023-12-02 20:06:56,828 INFO L378 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 24 treesize of output 17 [2023-12-02 20:06:56,898 INFO L378 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 24 treesize of output 17 [2023-12-02 20:06:56,982 INFO L378 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 24 treesize of output 17 [2023-12-02 20:06:57,079 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 15 proven. 66 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 20:06:57,079 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:06:57,088 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1944 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1944) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2023-12-02 20:06:57,093 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1944 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1944) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2023-12-02 20:06:57,180 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1944 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_1944) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 3)) 0)) is different from false [2023-12-02 20:06:57,604 INFO L349 Elim1Store]: treesize reduction 16, result has 66.7 percent of original size [2023-12-02 20:06:57,604 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 71 treesize of output 87 [2023-12-02 20:06:57,616 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:06:57,616 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 51 [2023-12-02 20:06:57,624 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:06:57,637 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2023-12-02 20:06:57,663 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:06:57,663 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 55 [2023-12-02 20:06:58,112 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 20 proven. 29 refuted. 0 times theorem prover too weak. 25 trivial. 32 not checked. [2023-12-02 20:06:58,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1328397543] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:06:58,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [630212237] [2023-12-02 20:06:58,113 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:06:58,113 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:06:58,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:06:58,114 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:06:58,114 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:06:59,009 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:01,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '63623#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:07:01,993 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:01,993 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:01,993 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 24, 24] total 66 [2023-12-02 20:07:01,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139629685] [2023-12-02 20:07:01,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:01,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-12-02 20:07:01,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:01,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-12-02 20:07:01,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=5628, Unknown=37, NotChecked=462, Total=6480 [2023-12-02 20:07:01,994 INFO L87 Difference]: Start difference. First operand 908 states and 1033 transitions. Second operand has 66 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 66 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:04,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:04,900 INFO L93 Difference]: Finished difference Result 1602 states and 1785 transitions. [2023-12-02 20:07:04,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-12-02 20:07:04,901 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 66 states have internal predecessors, (130), 0 states have call successors, (0), 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 54 [2023-12-02 20:07:04,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:04,903 INFO L225 Difference]: With dead ends: 1602 [2023-12-02 20:07:04,903 INFO L226 Difference]: Without dead ends: 1160 [2023-12-02 20:07:04,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 3351 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=1088, Invalid=12693, Unknown=37, NotChecked=702, Total=14520 [2023-12-02 20:07:04,904 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 396 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 2131 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 2501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 345 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:04,904 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 467 Invalid, 2501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2131 Invalid, 0 Unknown, 345 Unchecked, 1.0s Time] [2023-12-02 20:07:04,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1160 states. [2023-12-02 20:07:04,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1160 to 1060. [2023-12-02 20:07:04,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 1056 states have (on average 1.137310606060606) internal successors, (1201), 1059 states have internal predecessors, (1201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:04,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1201 transitions. [2023-12-02 20:07:04,913 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1201 transitions. Word has length 54 [2023-12-02 20:07:04,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:04,913 INFO L495 AbstractCegarLoop]: Abstraction has 1060 states and 1201 transitions. [2023-12-02 20:07:04,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.9696969696969697) internal successors, (130), 66 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:04,913 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1201 transitions. [2023-12-02 20:07:04,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-12-02 20:07:04,914 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:04,914 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:04,920 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2023-12-02 20:07:05,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2023-12-02 20:07:05,115 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:07:05,115 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:05,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1423597766, now seen corresponding path program 13 times [2023-12-02 20:07:05,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:05,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804877672] [2023-12-02 20:07:05,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:05,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:05,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:05,670 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 9 proven. 81 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 20:07:05,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:05,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804877672] [2023-12-02 20:07:05,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804877672] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:05,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349642763] [2023-12-02 20:07:05,670 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:07:05,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:05,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:05,671 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:05,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2023-12-02 20:07:05,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:05,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 60 conjunts are in the unsatisfiable core [2023-12-02 20:07:05,854 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:06,075 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 20:07:06,076 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:06,366 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-12-02 20:07:06,448 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 16 proven. 74 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 20:07:06,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [349642763] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:06,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [629148619] [2023-12-02 20:07:06,449 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:07:06,449 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:06,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:06,450 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:06,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:07,334 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:09,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66748#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:07:09,513 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:09,513 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:09,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 32 [2023-12-02 20:07:09,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254622585] [2023-12-02 20:07:09,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:09,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 20:07:09,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:09,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 20:07:09,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=2057, Unknown=0, NotChecked=0, Total=2256 [2023-12-02 20:07:09,515 INFO L87 Difference]: Start difference. First operand 1060 states and 1201 transitions. Second operand has 33 states, 32 states have (on average 3.15625) internal successors, (101), 33 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:10,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:10,422 INFO L93 Difference]: Finished difference Result 1173 states and 1304 transitions. [2023-12-02 20:07:10,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 20:07:10,422 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.15625) internal successors, (101), 33 states have internal predecessors, (101), 0 states have call successors, (0), 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 56 [2023-12-02 20:07:10,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:10,424 INFO L225 Difference]: With dead ends: 1173 [2023-12-02 20:07:10,424 INFO L226 Difference]: Without dead ends: 1173 [2023-12-02 20:07:10,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 130 SyntacticMatches, 6 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1287 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=376, Invalid=3656, Unknown=0, NotChecked=0, Total=4032 [2023-12-02 20:07:10,424 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 205 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:10,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 323 Invalid, 761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 20:07:10,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1173 states. [2023-12-02 20:07:10,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1173 to 1111. [2023-12-02 20:07:10,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1111 states, 1107 states have (on average 1.131887985546522) internal successors, (1253), 1110 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:10,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1111 states to 1111 states and 1253 transitions. [2023-12-02 20:07:10,433 INFO L78 Accepts]: Start accepts. Automaton has 1111 states and 1253 transitions. Word has length 56 [2023-12-02 20:07:10,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:10,433 INFO L495 AbstractCegarLoop]: Abstraction has 1111 states and 1253 transitions. [2023-12-02 20:07:10,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.15625) internal successors, (101), 33 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:10,433 INFO L276 IsEmpty]: Start isEmpty. Operand 1111 states and 1253 transitions. [2023-12-02 20:07:10,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 20:07:10,434 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:10,434 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:10,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2023-12-02 20:07:10,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2023-12-02 20:07:10,634 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:07:10,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:10,635 INFO L85 PathProgramCache]: Analyzing trace with hash -2116835022, now seen corresponding path program 15 times [2023-12-02 20:07:10,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:10,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646995469] [2023-12-02 20:07:10,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:10,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:10,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:12,092 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 100 proven. 213 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:12,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:12,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646995469] [2023-12-02 20:07:12,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646995469] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:12,093 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895093901] [2023-12-02 20:07:12,093 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:07:12,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:12,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:12,094 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:12,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2023-12-02 20:07:12,469 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:07:12,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:07:12,473 INFO L262 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 106 conjunts are in the unsatisfiable core [2023-12-02 20:07:12,475 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:13,227 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:07:13,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:07:13,286 INFO L378 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 22 treesize of output 21 [2023-12-02 20:07:15,205 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 13 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:15,205 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:16,411 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:07:16,411 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 93 treesize of output 83 [2023-12-02 20:07:18,015 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 15 proven. 298 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:07:18,015 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895093901] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:18,015 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2131328712] [2023-12-02 20:07:18,016 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:07:18,016 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:18,016 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:18,016 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:18,016 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:18,629 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:20,354 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69509#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:07:20,354 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:20,354 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:20,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 34, 34] total 94 [2023-12-02 20:07:20,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534595934] [2023-12-02 20:07:20,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:20,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-12-02 20:07:20,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:20,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-12-02 20:07:20,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=10190, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 20:07:20,356 INFO L87 Difference]: Start difference. First operand 1111 states and 1253 transitions. Second operand has 94 states, 94 states have (on average 1.7872340425531914) internal successors, (168), 94 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:41,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:07:41,308 INFO L93 Difference]: Finished difference Result 2476 states and 2712 transitions. [2023-12-02 20:07:41,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2023-12-02 20:07:41,308 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.7872340425531914) internal successors, (168), 94 states have internal predecessors, (168), 0 states have call successors, (0), 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 57 [2023-12-02 20:07:41,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:07:41,310 INFO L225 Difference]: With dead ends: 2476 [2023-12-02 20:07:41,310 INFO L226 Difference]: Without dead ends: 2356 [2023-12-02 20:07:41,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8722 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=1978, Invalid=41078, Unknown=0, NotChecked=0, Total=43056 [2023-12-02 20:07:41,312 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 1664 mSDsluCounter, 3296 mSDsCounter, 0 mSdLazyCounter, 8443 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1664 SdHoareTripleChecker+Valid, 3353 SdHoareTripleChecker+Invalid, 8525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 8443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2023-12-02 20:07:41,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1664 Valid, 3353 Invalid, 8525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 8443 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2023-12-02 20:07:41,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2356 states. [2023-12-02 20:07:41,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2356 to 1232. [2023-12-02 20:07:41,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1232 states, 1228 states have (on average 1.1319218241042346) internal successors, (1390), 1231 states have internal predecessors, (1390), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:41,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1232 states to 1232 states and 1390 transitions. [2023-12-02 20:07:41,324 INFO L78 Accepts]: Start accepts. Automaton has 1232 states and 1390 transitions. Word has length 57 [2023-12-02 20:07:41,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:07:41,324 INFO L495 AbstractCegarLoop]: Abstraction has 1232 states and 1390 transitions. [2023-12-02 20:07:41,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.7872340425531914) internal successors, (168), 94 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:07:41,325 INFO L276 IsEmpty]: Start isEmpty. Operand 1232 states and 1390 transitions. [2023-12-02 20:07:41,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 20:07:41,326 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:07:41,326 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:07:41,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2023-12-02 20:07:41,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2023-12-02 20:07:41,526 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:07:41,526 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:07:41,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1817954263, now seen corresponding path program 7 times [2023-12-02 20:07:41,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:07:41,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608867969] [2023-12-02 20:07:41,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:07:41,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:07:41,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:42,813 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 4 proven. 143 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:07:42,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:07:42,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608867969] [2023-12-02 20:07:42,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608867969] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:07:42,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559792794] [2023-12-02 20:07:42,814 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:07:42,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:07:42,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:07:42,815 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:07:42,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2023-12-02 20:07:42,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:07:42,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 80 conjunts are in the unsatisfiable core [2023-12-02 20:07:42,994 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:07:43,047 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 20:07:43,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:07:43,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 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 5 treesize of output 3 [2023-12-02 20:07:44,721 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 49 proven. 98 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:07:44,721 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:07:46,492 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:07:46,562 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 49 proven. 98 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:07:46,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1559792794] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:07:46,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283889704] [2023-12-02 20:07:46,563 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:07:46,563 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:07:46,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:07:46,564 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:07:46,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:07:47,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:07:49,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73854#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:07:49,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:07:49,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:07:49,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24, 24] total 75 [2023-12-02 20:07:49,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556663187] [2023-12-02 20:07:49,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:07:49,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2023-12-02 20:07:49,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:07:49,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2023-12-02 20:07:49,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=429, Invalid=7581, Unknown=0, NotChecked=0, Total=8010 [2023-12-02 20:07:49,715 INFO L87 Difference]: Start difference. First operand 1232 states and 1390 transitions. Second operand has 76 states, 75 states have (on average 2.24) internal successors, (168), 76 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:04,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:04,945 INFO L93 Difference]: Finished difference Result 2647 states and 2863 transitions. [2023-12-02 20:09:04,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 395 states. [2023-12-02 20:09:04,945 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 2.24) internal successors, (168), 76 states have internal predecessors, (168), 0 states have call successors, (0), 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 58 [2023-12-02 20:09:04,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:04,948 INFO L225 Difference]: With dead ends: 2647 [2023-12-02 20:09:04,948 INFO L226 Difference]: Without dead ends: 2629 [2023-12-02 20:09:04,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 480 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87516 ImplicationChecksByTransitivity, 73.4s TimeCoverageRelationStatistics Valid=21561, Invalid=210281, Unknown=0, NotChecked=0, Total=231842 [2023-12-02 20:09:04,958 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 1857 mSDsluCounter, 892 mSDsCounter, 0 mSdLazyCounter, 11914 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1857 SdHoareTripleChecker+Valid, 917 SdHoareTripleChecker+Invalid, 12137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 11914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:04,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1857 Valid, 917 Invalid, 12137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 11914 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2023-12-02 20:09:04,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2629 states. [2023-12-02 20:09:04,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2629 to 1356. [2023-12-02 20:09:04,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1356 states, 1352 states have (on average 1.1301775147928994) internal successors, (1528), 1355 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:04,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1356 states to 1356 states and 1528 transitions. [2023-12-02 20:09:04,975 INFO L78 Accepts]: Start accepts. Automaton has 1356 states and 1528 transitions. Word has length 58 [2023-12-02 20:09:04,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:04,975 INFO L495 AbstractCegarLoop]: Abstraction has 1356 states and 1528 transitions. [2023-12-02 20:09:04,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 2.24) internal successors, (168), 76 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:04,975 INFO L276 IsEmpty]: Start isEmpty. Operand 1356 states and 1528 transitions. [2023-12-02 20:09:04,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 20:09:04,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:04,977 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:04,982 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2023-12-02 20:09:05,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2023-12-02 20:09:05,177 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:09:05,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:05,178 INFO L85 PathProgramCache]: Analyzing trace with hash 1817945227, now seen corresponding path program 6 times [2023-12-02 20:09:05,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:05,178 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322293139] [2023-12-02 20:09:05,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:05,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:05,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:06,922 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 40 proven. 109 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:09:06,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:06,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322293139] [2023-12-02 20:09:06,922 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322293139] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:09:06,922 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764932305] [2023-12-02 20:09:06,922 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 20:09:06,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:06,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:06,923 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:06,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2023-12-02 20:09:07,207 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 20:09:07,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:09:07,211 INFO L262 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 115 conjunts are in the unsatisfiable core [2023-12-02 20:09:07,214 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:07,275 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-12-02 20:09:07,275 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 11 [2023-12-02 20:09:08,612 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:09:08,950 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:09:08,950 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 29 [2023-12-02 20:09:10,262 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:10,262 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:11,826 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 31 [2023-12-02 20:09:14,003 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:09:14,091 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:14,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764932305] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:09:14,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447927151] [2023-12-02 20:09:14,092 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:09:14,092 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:14,092 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:14,092 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:14,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:09:14,944 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:09:18,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79091#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:09:18,117 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:09:18,117 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:09:18,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 32, 34] total 92 [2023-12-02 20:09:18,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970560573] [2023-12-02 20:09:18,118 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:09:18,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2023-12-02 20:09:18,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:09:18,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2023-12-02 20:09:18,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=10990, Unknown=0, NotChecked=0, Total=11772 [2023-12-02 20:09:18,120 INFO L87 Difference]: Start difference. First operand 1356 states and 1528 transitions. Second operand has 94 states, 93 states have (on average 1.8494623655913978) internal successors, (172), 93 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:37,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:37,160 INFO L93 Difference]: Finished difference Result 2177 states and 2362 transitions. [2023-12-02 20:09:37,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2023-12-02 20:09:37,160 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 93 states have (on average 1.8494623655913978) internal successors, (172), 93 states have internal predecessors, (172), 0 states have call successors, (0), 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 58 [2023-12-02 20:09:37,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:37,163 INFO L225 Difference]: With dead ends: 2177 [2023-12-02 20:09:37,163 INFO L226 Difference]: Without dead ends: 2060 [2023-12-02 20:09:37,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 299 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11836 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=4601, Invalid=39289, Unknown=0, NotChecked=0, Total=43890 [2023-12-02 20:09:37,165 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 1232 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 5415 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1232 SdHoareTripleChecker+Valid, 1116 SdHoareTripleChecker+Invalid, 5474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 5415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:37,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1232 Valid, 1116 Invalid, 5474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 5415 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2023-12-02 20:09:37,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2060 states. [2023-12-02 20:09:37,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2060 to 1340. [2023-12-02 20:09:37,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1340 states, 1336 states have (on average 1.1279940119760479) internal successors, (1507), 1339 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:37,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1340 states to 1340 states and 1507 transitions. [2023-12-02 20:09:37,177 INFO L78 Accepts]: Start accepts. Automaton has 1340 states and 1507 transitions. Word has length 58 [2023-12-02 20:09:37,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:37,177 INFO L495 AbstractCegarLoop]: Abstraction has 1340 states and 1507 transitions. [2023-12-02 20:09:37,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 93 states have (on average 1.8494623655913978) internal successors, (172), 93 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:37,177 INFO L276 IsEmpty]: Start isEmpty. Operand 1340 states and 1507 transitions. [2023-12-02 20:09:37,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 20:09:37,179 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:37,179 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:37,184 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2023-12-02 20:09:37,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2023-12-02 20:09:37,380 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:09:37,380 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:37,380 INFO L85 PathProgramCache]: Analyzing trace with hash 81641317, now seen corresponding path program 16 times [2023-12-02 20:09:37,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:37,380 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431783472] [2023-12-02 20:09:37,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:37,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:37,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:39,038 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 121 proven. 244 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:39,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:39,038 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431783472] [2023-12-02 20:09:39,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431783472] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:09:39,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079960505] [2023-12-02 20:09:39,039 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:09:39,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:39,039 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:39,040 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:39,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2023-12-02 20:09:39,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:39,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 107 conjunts are in the unsatisfiable core [2023-12-02 20:09:39,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:39,238 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:09:39,967 INFO L378 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 [2023-12-02 20:09:40,018 INFO L378 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 [2023-12-02 20:09:40,891 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 14 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:40,891 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:40,933 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2291 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| v_ArrVal_2291) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ 13 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|)) 0)) is different from false [2023-12-02 20:09:40,938 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:09:40,938 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2023-12-02 20:09:40,944 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 20:09:40,944 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 34 [2023-12-02 20:09:41,185 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 14 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:09:41,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079960505] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:09:41,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [646814922] [2023-12-02 20:09:41,186 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 20:09:41,186 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:41,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:41,186 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:41,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:09:41,819 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:09:43,096 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '83253#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_main_~length2~0#1| 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| 0) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:09:43,096 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:09:43,096 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:09:43,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 34, 34] total 68 [2023-12-02 20:09:43,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100057992] [2023-12-02 20:09:43,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:09:43,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2023-12-02 20:09:43,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:09:43,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2023-12-02 20:09:43,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=5469, Unknown=1, NotChecked=148, Total=5852 [2023-12-02 20:09:43,098 INFO L87 Difference]: Start difference. First operand 1340 states and 1507 transitions. Second operand has 68 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 68 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:52,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:09:52,474 INFO L93 Difference]: Finished difference Result 2748 states and 3008 transitions. [2023-12-02 20:09:52,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2023-12-02 20:09:52,474 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 68 states have internal predecessors, (127), 0 states have call successors, (0), 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 61 [2023-12-02 20:09:52,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:09:52,478 INFO L225 Difference]: With dead ends: 2748 [2023-12-02 20:09:52,478 INFO L226 Difference]: Without dead ends: 2624 [2023-12-02 20:09:52,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 152 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4740 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1158, Invalid=22101, Unknown=1, NotChecked=302, Total=23562 [2023-12-02 20:09:52,479 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 1164 mSDsluCounter, 3037 mSDsCounter, 0 mSdLazyCounter, 7670 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1164 SdHoareTripleChecker+Valid, 3099 SdHoareTripleChecker+Invalid, 8154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 7670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 399 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-12-02 20:09:52,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1164 Valid, 3099 Invalid, 8154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 7670 Invalid, 0 Unknown, 399 Unchecked, 3.4s Time] [2023-12-02 20:09:52,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2624 states. [2023-12-02 20:09:52,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2624 to 1461. [2023-12-02 20:09:52,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1461 states, 1457 states have (on average 1.1290322580645162) internal successors, (1645), 1460 states have internal predecessors, (1645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:52,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1461 states to 1461 states and 1645 transitions. [2023-12-02 20:09:52,493 INFO L78 Accepts]: Start accepts. Automaton has 1461 states and 1645 transitions. Word has length 61 [2023-12-02 20:09:52,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:09:52,494 INFO L495 AbstractCegarLoop]: Abstraction has 1461 states and 1645 transitions. [2023-12-02 20:09:52,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.8676470588235294) internal successors, (127), 68 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:09:52,494 INFO L276 IsEmpty]: Start isEmpty. Operand 1461 states and 1645 transitions. [2023-12-02 20:09:52,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 20:09:52,495 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:09:52,495 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:09:52,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2023-12-02 20:09:52,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:52,696 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:09:52,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:09:52,696 INFO L85 PathProgramCache]: Analyzing trace with hash -1452169377, now seen corresponding path program 7 times [2023-12-02 20:09:52,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:09:52,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450463045] [2023-12-02 20:09:52,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:09:52,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:09:52,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:54,134 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 38 proven. 94 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:09:54,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:09:54,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450463045] [2023-12-02 20:09:54,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450463045] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:09:54,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1911051444] [2023-12-02 20:09:54,134 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 20:09:54,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:09:54,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:09:54,135 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:09:54,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2023-12-02 20:09:54,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:09:54,333 INFO L262 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 99 conjunts are in the unsatisfiable core [2023-12-02 20:09:54,336 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:09:54,390 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:09:54,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:09:54,393 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:09:56,859 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 96 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:09:56,860 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:09:59,838 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 20:09:59,932 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 49 proven. 83 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 20:09:59,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1911051444] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:09:59,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814357007] [2023-12-02 20:09:59,933 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:09:59,933 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:09:59,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:09:59,934 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:09:59,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:10:00,790 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:10:03,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88071#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (= (select |#valid| |ULTIMATE.start_cstrncat_#t~post4#1.base|) 1) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_cstrncat_#t~mem5#1| (select (select |#memory_int| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|)) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1) (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|)) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:10:03,769 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:10:03,769 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:10:03,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 30] total 84 [2023-12-02 20:10:03,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705497449] [2023-12-02 20:10:03,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:10:03,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-12-02 20:10:03,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:10:03,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-12-02 20:10:03,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=931, Invalid=9169, Unknown=0, NotChecked=0, Total=10100 [2023-12-02 20:10:03,771 INFO L87 Difference]: Start difference. First operand 1461 states and 1645 transitions. Second operand has 86 states, 85 states have (on average 2.011764705882353) internal successors, (171), 85 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:14,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:10:14,751 INFO L93 Difference]: Finished difference Result 2028 states and 2217 transitions. [2023-12-02 20:10:14,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-12-02 20:10:14,751 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.011764705882353) internal successors, (171), 85 states have internal predecessors, (171), 0 states have call successors, (0), 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 61 [2023-12-02 20:10:14,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:10:14,754 INFO L225 Difference]: With dead ends: 2028 [2023-12-02 20:10:14,754 INFO L226 Difference]: Without dead ends: 1930 [2023-12-02 20:10:14,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 108 SyntacticMatches, 1 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8757 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=3499, Invalid=24893, Unknown=0, NotChecked=0, Total=28392 [2023-12-02 20:10:14,756 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 836 mSDsluCounter, 668 mSDsCounter, 0 mSdLazyCounter, 3176 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 836 SdHoareTripleChecker+Valid, 694 SdHoareTripleChecker+Invalid, 3268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 3176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-12-02 20:10:14,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [836 Valid, 694 Invalid, 3268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 3176 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-12-02 20:10:14,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2023-12-02 20:10:14,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1293. [2023-12-02 20:10:14,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1293 states, 1289 states have (on average 1.1326609775019394) internal successors, (1460), 1292 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:14,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1293 states to 1293 states and 1460 transitions. [2023-12-02 20:10:14,767 INFO L78 Accepts]: Start accepts. Automaton has 1293 states and 1460 transitions. Word has length 61 [2023-12-02 20:10:14,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:10:14,768 INFO L495 AbstractCegarLoop]: Abstraction has 1293 states and 1460 transitions. [2023-12-02 20:10:14,768 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.011764705882353) internal successors, (171), 85 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:14,768 INFO L276 IsEmpty]: Start isEmpty. Operand 1293 states and 1460 transitions. [2023-12-02 20:10:14,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 20:10:14,769 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:10:14,769 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:10:14,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2023-12-02 20:10:14,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:14,969 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:10:14,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:10:14,970 INFO L85 PathProgramCache]: Analyzing trace with hash -896752367, now seen corresponding path program 14 times [2023-12-02 20:10:14,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:10:14,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054411417] [2023-12-02 20:10:14,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:14,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:10:15,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:16,680 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 36 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:10:16,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:10:16,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054411417] [2023-12-02 20:10:16,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054411417] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:10:16,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842357122] [2023-12-02 20:10:16,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:10:16,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:16,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:10:16,682 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:10:16,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2023-12-02 20:10:17,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-12-02 20:10:17,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:10:17,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 133 conjunts are in the unsatisfiable core [2023-12-02 20:10:17,208 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:10:17,216 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:10:17,857 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 20:10:18,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:10:18,135 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:10:18,270 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:10:18,430 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:10:18,570 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 20:10:18,728 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 18 proven. 124 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 20:10:18,728 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:10:18,738 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2449 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_2449) |c_ULTIMATE.start_cstrncat_~s2#1.base|) |c_ULTIMATE.start_cstrncat_~s2#1.offset|) 0)) is different from false [2023-12-02 20:10:18,744 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_2449 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_cstrncat_~s~0#1.base| v_ArrVal_2449) |c_ULTIMATE.start_cstrncat_~s2#1.base|) (+ |c_ULTIMATE.start_cstrncat_~s2#1.offset| 1)) 0)) is different from false [2023-12-02 20:10:19,093 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 15 treesize of output 13 [2023-12-02 20:10:19,095 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2023-12-02 20:10:19,569 INFO L134 CoverageAnalysis]: Checked inductivity of 143 backedges. 18 proven. 67 refuted. 0 times theorem prover too weak. 25 trivial. 33 not checked. [2023-12-02 20:10:19,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842357122] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:10:19,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [940757611] [2023-12-02 20:10:19,570 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-12-02 20:10:19,570 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:10:19,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:10:19,570 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:10:19,570 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:10:20,428 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:10:23,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91977#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.base| |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= 1 |#StackHeapBarrier|) |ULTIMATE.start_cstrncat_#t~short6#1| (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (= |ULTIMATE.start_cstrncat_~s2#1.offset| (+ |ULTIMATE.start_cstrncat_#t~post4#1.offset| 1)) (<= 2 |ULTIMATE.start_cstrncat_#t~post4#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_#t~post4#1.base|) |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_cstrncat_#t~post4#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:10:23,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:10:23,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:10:23,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 30, 21] total 74 [2023-12-02 20:10:23,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519101101] [2023-12-02 20:10:23,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:10:23,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2023-12-02 20:10:23,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:10:23,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2023-12-02 20:10:23,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=7174, Unknown=18, NotChecked=342, Total=7832 [2023-12-02 20:10:23,532 INFO L87 Difference]: Start difference. First operand 1293 states and 1460 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 74 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:29,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:10:29,971 INFO L93 Difference]: Finished difference Result 2235 states and 2469 transitions. [2023-12-02 20:10:29,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2023-12-02 20:10:29,971 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 74 states have internal predecessors, (155), 0 states have call successors, (0), 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 61 [2023-12-02 20:10:29,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:10:29,973 INFO L225 Difference]: With dead ends: 2235 [2023-12-02 20:10:29,973 INFO L226 Difference]: Without dead ends: 1548 [2023-12-02 20:10:29,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 135 SyntacticMatches, 6 SemanticMatches, 177 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 8779 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=1731, Invalid=29411, Unknown=18, NotChecked=702, Total=31862 [2023-12-02 20:10:29,974 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 609 mSDsluCounter, 718 mSDsCounter, 0 mSdLazyCounter, 3569 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 609 SdHoareTripleChecker+Valid, 736 SdHoareTripleChecker+Invalid, 4022 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 3569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 408 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-12-02 20:10:29,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [609 Valid, 736 Invalid, 4022 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 3569 Invalid, 0 Unknown, 408 Unchecked, 1.7s Time] [2023-12-02 20:10:29,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1548 states. [2023-12-02 20:10:29,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1548 to 1434. [2023-12-02 20:10:29,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1434 states, 1430 states have (on average 1.1293706293706294) internal successors, (1615), 1433 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:29,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1434 states to 1434 states and 1615 transitions. [2023-12-02 20:10:29,985 INFO L78 Accepts]: Start accepts. Automaton has 1434 states and 1615 transitions. Word has length 61 [2023-12-02 20:10:29,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:10:29,985 INFO L495 AbstractCegarLoop]: Abstraction has 1434 states and 1615 transitions. [2023-12-02 20:10:29,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 74 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:10:29,985 INFO L276 IsEmpty]: Start isEmpty. Operand 1434 states and 1615 transitions. [2023-12-02 20:10:29,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-12-02 20:10:29,986 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:10:29,986 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:10:29,992 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2023-12-02 20:10:30,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:30,187 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:10:30,187 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:10:30,187 INFO L85 PathProgramCache]: Analyzing trace with hash -829560188, now seen corresponding path program 8 times [2023-12-02 20:10:30,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:10:30,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358664124] [2023-12-02 20:10:30,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:10:30,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:10:30,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:10:31,620 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 4 proven. 178 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:10:31,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:10:31,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358664124] [2023-12-02 20:10:31,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358664124] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:10:31,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097757804] [2023-12-02 20:10:31,620 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:10:31,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:10:31,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:10:31,621 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:10:31,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2023-12-02 20:10:32,177 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-12-02 20:10:32,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:10:32,182 INFO L262 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 105 conjunts are in the unsatisfiable core [2023-12-02 20:10:32,185 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:10:32,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 20:10:32,193 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 7 [2023-12-02 20:10:32,196 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:10:33,926 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:10:33,927 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 20:10:35,992 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 20:10:35,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097757804] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 20:10:35,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [386813546] [2023-12-02 20:10:35,993 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-12-02 20:10:35,993 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 20:10:35,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 20:10:35,993 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 20:10:35,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 20:10:36,846 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 20:10:39,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '96297#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_cstrncat_~s2#1.base|) (<= (select |#length| |ULTIMATE.start_cstrncat_~s~0#1.base|) |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s1#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s~0#1.offset|) (= |ULTIMATE.start_cstrncat_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s~0#1.base|) (= |ULTIMATE.start_cstrncat_~s1#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= 0 |ULTIMATE.start_cstrncat_~s2#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (= 0 |ULTIMATE.start_cstrncat_#in~s2#1.offset|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncat_~s1#1.base|))' at error location [2023-12-02 20:10:39,429 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 20:10:39,429 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 20:10:39,429 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 83 [2023-12-02 20:10:39,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970604490] [2023-12-02 20:10:39,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 20:10:39,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-12-02 20:10:39,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 20:10:39,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-12-02 20:10:39,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=8828, Unknown=0, NotChecked=0, Total=9506 [2023-12-02 20:10:39,431 INFO L87 Difference]: Start difference. First operand 1434 states and 1615 transitions. Second operand has 84 states, 83 states have (on average 2.144578313253012) internal successors, (178), 84 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:11:04,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 20:11:04,371 INFO L93 Difference]: Finished difference Result 2973 states and 3271 transitions. [2023-12-02 20:11:04,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 189 states. [2023-12-02 20:11:04,371 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 2.144578313253012) internal successors, (178), 84 states have internal predecessors, (178), 0 states have call successors, (0), 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 62 [2023-12-02 20:11:04,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 20:11:04,375 INFO L225 Difference]: With dead ends: 2973 [2023-12-02 20:11:04,375 INFO L226 Difference]: Without dead ends: 2933 [2023-12-02 20:11:04,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24653 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=6994, Invalid=70012, Unknown=0, NotChecked=0, Total=77006 [2023-12-02 20:11:04,380 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 1161 mSDsluCounter, 1005 mSDsCounter, 0 mSdLazyCounter, 4705 mSolverCounterSat, 235 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1161 SdHoareTripleChecker+Valid, 1035 SdHoareTripleChecker+Invalid, 4940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 235 IncrementalHoareTripleChecker+Valid, 4705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2023-12-02 20:11:04,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1161 Valid, 1035 Invalid, 4940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [235 Valid, 4705 Invalid, 0 Unknown, 0 Unchecked, 3.3s Time] [2023-12-02 20:11:04,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2933 states. [2023-12-02 20:11:04,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2933 to 1435. [2023-12-02 20:11:04,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1435 states, 1431 states have (on average 1.1285814116002795) internal successors, (1615), 1434 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:11:04,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1435 states to 1435 states and 1615 transitions. [2023-12-02 20:11:04,398 INFO L78 Accepts]: Start accepts. Automaton has 1435 states and 1615 transitions. Word has length 62 [2023-12-02 20:11:04,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 20:11:04,398 INFO L495 AbstractCegarLoop]: Abstraction has 1435 states and 1615 transitions. [2023-12-02 20:11:04,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 2.144578313253012) internal successors, (178), 84 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 20:11:04,398 INFO L276 IsEmpty]: Start isEmpty. Operand 1435 states and 1615 transitions. [2023-12-02 20:11:04,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-12-02 20:11:04,399 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 20:11:04,399 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 20:11:04,405 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2023-12-02 20:11:04,600 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2023-12-02 20:11:04,600 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2023-12-02 20:11:04,600 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 20:11:04,601 INFO L85 PathProgramCache]: Analyzing trace with hash 257976280, now seen corresponding path program 17 times [2023-12-02 20:11:04,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 20:11:04,601 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152176198] [2023-12-02 20:11:04,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 20:11:04,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 20:11:04,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 20:11:06,896 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 144 proven. 277 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 20:11:06,896 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 20:11:06,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152176198] [2023-12-02 20:11:06,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152176198] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 20:11:06,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1611874329] [2023-12-02 20:11:06,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 20:11:06,897 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 20:11:06,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 20:11:06,898 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 20:11:06,898 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_53ca2d22-ec5b-4aab-bdc0-c7b15fd30438/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2023-12-02 20:11:07,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-12-02 20:11:07,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 20:11:07,415 INFO L262 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 87 conjunts are in the unsatisfiable core [2023-12-02 20:11:07,418 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 20:11:07,422 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-12-02 20:11:08,112 INFO L378 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 17 treesize of output 13 [2023-12-02 20:11:08,217 INFO L378 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 22 treesize of output 17