./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/loops/string-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/loops/string-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:07:39,153 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:07:39,238 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:07:39,244 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:07:39,244 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:07:39,284 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:07:39,285 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:07:39,286 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:07:39,287 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:07:39,291 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:07:39,292 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:07:39,293 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:07:39,294 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:07:39,299 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:07:39,299 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:07:39,300 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:07:39,301 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:07:39,302 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:07:39,302 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:07:39,303 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:07:39,303 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:07:39,304 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:07:39,304 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:07:39,305 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:07:39,306 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:07:39,306 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:07:39,306 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:07:39,307 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:07:39,308 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:07:39,308 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:07:39,309 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:07:39,310 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:07:39,310 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:07:39,310 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:07:39,310 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:07:39,310 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:07:39,311 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:07:39,311 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:07:39,311 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:07:39,311 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:07:39,312 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:07:39,312 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:07:39,312 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:07:39,312 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:07:39,313 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:07:39,313 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:07:39,313 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_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de [2023-11-12 00:07:39,639 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:07:39,669 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:07:39,672 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:07:39,673 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:07:39,675 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:07:39,676 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/loops/string-1.i [2023-11-12 00:07:42,799 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:07:43,093 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:07:43,094 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/sv-benchmarks/c/loops/string-1.i [2023-11-12 00:07:43,101 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/data/e9efe48c0/d0ea135861a84a6ba6e6e1a2badd139a/FLAG77ba2726c [2023-11-12 00:07:43,115 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/data/e9efe48c0/d0ea135861a84a6ba6e6e1a2badd139a [2023-11-12 00:07:43,118 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:07:43,119 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:07:43,121 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:07:43,121 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:07:43,127 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:07:43,128 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,129 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1122249b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43, skipping insertion in model container [2023-11-12 00:07:43,130 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,154 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:07:43,364 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:07:43,375 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:07:43,399 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:07:43,415 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:07:43,416 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43 WrapperNode [2023-11-12 00:07:43,416 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:07:43,417 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:07:43,418 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:07:43,418 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:07:43,425 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,432 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,456 INFO L138 Inliner]: procedures = 17, calls = 28, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 130 [2023-11-12 00:07:43,456 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:07:43,457 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:07:43,457 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:07:43,457 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:07:43,467 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,467 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,470 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,470 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,476 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,481 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,483 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,484 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,487 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:07:43,488 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:07:43,488 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:07:43,488 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:07:43,489 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (1/1) ... [2023-11-12 00:07:43,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:07:43,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:43,521 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:07:43,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:07:43,566 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:07:43,567 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:07:43,568 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:07:43,568 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:07:43,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:07:43,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:07:43,568 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:07:43,569 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:07:43,651 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:07:43,653 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:07:43,926 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:07:44,006 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:07:44,006 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-12 00:07:44,010 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:07:44 BoogieIcfgContainer [2023-11-12 00:07:44,010 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:07:44,018 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:07:44,018 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:07:44,021 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:07:44,022 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:07:43" (1/3) ... [2023-11-12 00:07:44,023 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a1d7d05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:07:44, skipping insertion in model container [2023-11-12 00:07:44,024 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:07:43" (2/3) ... [2023-11-12 00:07:44,025 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a1d7d05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:07:44, skipping insertion in model container [2023-11-12 00:07:44,026 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:07:44" (3/3) ... [2023-11-12 00:07:44,027 INFO L112 eAbstractionObserver]: Analyzing ICFG string-1.i [2023-11-12 00:07:44,043 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:07:44,043 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 18 error locations. [2023-11-12 00:07:44,113 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:07:44,124 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;@4eb71bf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:07:44,124 INFO L358 AbstractCegarLoop]: Starting to check reachability of 18 error locations. [2023-11-12 00:07:44,133 INFO L276 IsEmpty]: Start isEmpty. Operand has 43 states, 24 states have (on average 2.25) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:07:44,144 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:44,145 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:07:44,146 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:44,155 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:44,156 INFO L85 PathProgramCache]: Analyzing trace with hash 169932, now seen corresponding path program 1 times [2023-11-12 00:07:44,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:44,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327884728] [2023-11-12 00:07:44,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:44,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:44,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:44,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:44,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:44,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327884728] [2023-11-12 00:07:44,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327884728] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:44,388 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:44,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:07:44,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219163848] [2023-11-12 00:07:44,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:44,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:07:44,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:44,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:07:44,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:44,452 INFO L87 Difference]: Start difference. First operand has 43 states, 24 states have (on average 2.25) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:44,628 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2023-11-12 00:07:44,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:07:44,631 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:07:44,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:44,640 INFO L225 Difference]: With dead ends: 64 [2023-11-12 00:07:44,641 INFO L226 Difference]: Without dead ends: 63 [2023-11-12 00:07:44,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:44,647 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 19 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:44,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 65 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:44,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-12 00:07:44,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 43. [2023-11-12 00:07:44,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 25 states have (on average 2.0) internal successors, (50), 42 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2023-11-12 00:07:44,692 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 3 [2023-11-12 00:07:44,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:44,693 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2023-11-12 00:07:44,693 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,693 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2023-11-12 00:07:44,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:07:44,694 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:44,694 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:07:44,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:07:44,695 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:44,695 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:44,701 INFO L85 PathProgramCache]: Analyzing trace with hash 165614, now seen corresponding path program 1 times [2023-11-12 00:07:44,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:44,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472486735] [2023-11-12 00:07:44,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:44,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:44,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:44,899 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:44,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:44,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472486735] [2023-11-12 00:07:44,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472486735] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:44,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:44,901 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:07:44,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883931873] [2023-11-12 00:07:44,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:44,903 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:07:44,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:44,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:07:44,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:44,905 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:44,962 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2023-11-12 00:07:44,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:07:44,963 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:07:44,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:44,964 INFO L225 Difference]: With dead ends: 39 [2023-11-12 00:07:44,965 INFO L226 Difference]: Without dead ends: 39 [2023-11-12 00:07:44,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:44,967 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:44,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 19 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:07:44,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-11-12 00:07:44,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-11-12 00:07:44,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.84) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2023-11-12 00:07:44,975 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 3 [2023-11-12 00:07:44,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:44,976 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2023-11-12 00:07:44,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:44,977 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2023-11-12 00:07:44,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-12 00:07:44,977 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:44,977 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-12 00:07:44,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:07:44,978 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:44,979 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:44,979 INFO L85 PathProgramCache]: Analyzing trace with hash 165615, now seen corresponding path program 1 times [2023-11-12 00:07:44,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:44,980 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377158193] [2023-11-12 00:07:44,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:44,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:44,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:45,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:45,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:45,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377158193] [2023-11-12 00:07:45,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377158193] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:45,190 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:45,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:07:45,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130131683] [2023-11-12 00:07:45,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:45,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:07:45,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:45,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:07:45,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:45,194 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:45,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:45,294 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2023-11-12 00:07:45,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:07:45,296 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-12 00:07:45,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:45,300 INFO L225 Difference]: With dead ends: 40 [2023-11-12 00:07:45,303 INFO L226 Difference]: Without dead ends: 40 [2023-11-12 00:07:45,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:45,305 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:45,306 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:45,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-12 00:07:45,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2023-11-12 00:07:45,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:45,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2023-11-12 00:07:45,312 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 3 [2023-11-12 00:07:45,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:45,313 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2023-11-12 00:07:45,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:45,313 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2023-11-12 00:07:45,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:07:45,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:45,314 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 00:07:45,314 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:07:45,314 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:45,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:45,315 INFO L85 PathProgramCache]: Analyzing trace with hash 159282703, now seen corresponding path program 1 times [2023-11-12 00:07:45,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:45,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143283303] [2023-11-12 00:07:45,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:45,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:45,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:45,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:45,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:45,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143283303] [2023-11-12 00:07:45,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143283303] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:45,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078951022] [2023-11-12 00:07:45,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:45,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:45,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:45,379 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:45,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:07:45,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:45,461 INFO L262 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:07:45,466 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:45,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:45,502 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:45,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:45,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078951022] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:45,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471580727] [2023-11-12 00:07:45,559 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 00:07:45,560 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:45,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:45,579 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:45,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:46,294 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:46,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '350#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) 4) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:46,451 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:46,455 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:46,455 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 5 [2023-11-12 00:07:46,456 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352365109] [2023-11-12 00:07:46,456 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:46,458 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:07:46,458 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:46,459 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:07:46,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:07:46,461 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:46,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:46,576 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2023-11-12 00:07:46,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:07:46,577 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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 5 [2023-11-12 00:07:46,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:46,579 INFO L225 Difference]: With dead ends: 72 [2023-11-12 00:07:46,579 INFO L226 Difference]: Without dead ends: 72 [2023-11-12 00:07:46,582 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:07:46,589 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 33 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:46,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 111 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:46,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-12 00:07:46,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 51. [2023-11-12 00:07:46,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.7837837837837838) internal successors, (66), 50 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:46,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 66 transitions. [2023-11-12 00:07:46,610 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 66 transitions. Word has length 5 [2023-11-12 00:07:46,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:46,611 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 66 transitions. [2023-11-12 00:07:46,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:46,611 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 66 transitions. [2023-11-12 00:07:46,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 00:07:46,612 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:46,613 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2023-11-12 00:07:46,624 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:46,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:46,819 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:46,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:46,819 INFO L85 PathProgramCache]: Analyzing trace with hash 159278385, now seen corresponding path program 1 times [2023-11-12 00:07:46,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:46,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902341047] [2023-11-12 00:07:46,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:46,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:46,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:47,026 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:47,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:47,026 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902341047] [2023-11-12 00:07:47,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902341047] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:47,030 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269132186] [2023-11-12 00:07:47,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:47,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:47,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:47,036 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:47,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:07:47,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:47,115 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:07:47,117 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:47,168 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:07:47,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:07:47,175 INFO L351 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 [2023-11-12 00:07:47,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:47,226 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:47,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:47,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269132186] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:47,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451705514] [2023-11-12 00:07:47,279 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2023-11-12 00:07:47,279 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:47,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:47,281 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:47,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:47,564 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:47,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '509#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet2#1|)) (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_#t~nondet2#1| 127) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= |ULTIMATE.start_main_~i~0#1| 4) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:47,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:47,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:47,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 6 [2023-11-12 00:07:47,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839792056] [2023-11-12 00:07:47,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:47,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 00:07:47,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:47,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 00:07:47,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:07:47,715 INFO L87 Difference]: Start difference. First operand 51 states and 66 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:47,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:47,834 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2023-11-12 00:07:47,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:07:47,835 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-12 00:07:47,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:47,836 INFO L225 Difference]: With dead ends: 52 [2023-11-12 00:07:47,836 INFO L226 Difference]: Without dead ends: 52 [2023-11-12 00:07:47,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:07:47,837 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 2 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:47,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 61 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:47,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-12 00:07:47,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-12 00:07:47,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.7105263157894737) internal successors, (65), 51 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:47,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2023-11-12 00:07:47,843 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 5 [2023-11-12 00:07:47,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:47,843 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2023-11-12 00:07:47,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:47,844 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2023-11-12 00:07:47,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:07:47,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:47,844 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1] [2023-11-12 00:07:47,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:48,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:48,050 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:48,050 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:48,050 INFO L85 PathProgramCache]: Analyzing trace with hash -1082958379, now seen corresponding path program 2 times [2023-11-12 00:07:48,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:48,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661170727] [2023-11-12 00:07:48,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:48,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:48,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:48,172 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:48,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:48,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661170727] [2023-11-12 00:07:48,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661170727] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:48,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750206151] [2023-11-12 00:07:48,173 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:07:48,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:48,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:48,176 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:48,203 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:07:48,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-12 00:07:48,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:07:48,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:07:48,249 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:48,271 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:07:48,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:07:48,277 INFO L351 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 [2023-11-12 00:07:48,336 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:07:48,336 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:07:48,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750206151] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:48,337 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:07:48,337 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [6] total 7 [2023-11-12 00:07:48,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832148939] [2023-11-12 00:07:48,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:48,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:07:48,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:48,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:07:48,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:07:48,341 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:48,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:48,392 INFO L93 Difference]: Finished difference Result 51 states and 64 transitions. [2023-11-12 00:07:48,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:07:48,393 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 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 11 [2023-11-12 00:07:48,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:48,393 INFO L225 Difference]: With dead ends: 51 [2023-11-12 00:07:48,394 INFO L226 Difference]: Without dead ends: 51 [2023-11-12 00:07:48,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:07:48,395 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 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 [2023-11-12 00:07:48,396 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:07:48,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-12 00:07:48,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-12 00:07:48,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 50 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:48,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 64 transitions. [2023-11-12 00:07:48,412 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 64 transitions. Word has length 11 [2023-11-12 00:07:48,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:48,412 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 64 transitions. [2023-11-12 00:07:48,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:48,412 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 64 transitions. [2023-11-12 00:07:48,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:07:48,413 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:48,413 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1] [2023-11-12 00:07:48,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:48,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:48,619 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:48,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:48,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1082962697, now seen corresponding path program 2 times [2023-11-12 00:07:48,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:48,620 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199199940] [2023-11-12 00:07:48,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:48,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:48,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:48,866 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:48,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:48,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199199940] [2023-11-12 00:07:48,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199199940] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:48,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121994976] [2023-11-12 00:07:48,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:07:48,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:48,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:48,868 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:48,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:07:48,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:07:48,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:07:48,932 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-12 00:07:48,934 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:48,952 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:07:48,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:07:48,957 INFO L351 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 [2023-11-12 00:07:49,042 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:07:49,042 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:07:49,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121994976] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:49,043 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:07:49,043 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 8 [2023-11-12 00:07:49,043 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967532897] [2023-11-12 00:07:49,043 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:49,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:07:49,044 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:49,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:07:49,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:07:49,044 INFO L87 Difference]: Start difference. First operand 51 states and 64 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:49,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:49,113 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2023-11-12 00:07:49,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:07:49,114 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 11 [2023-11-12 00:07:49,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:49,114 INFO L225 Difference]: With dead ends: 50 [2023-11-12 00:07:49,115 INFO L226 Difference]: Without dead ends: 50 [2023-11-12 00:07:49,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:07:49,116 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:49,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 34 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:49,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-12 00:07:49,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2023-11-12 00:07:49,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 37 states have (on average 1.6756756756756757) internal successors, (62), 48 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:49,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2023-11-12 00:07:49,126 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 11 [2023-11-12 00:07:49,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:49,127 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2023-11-12 00:07:49,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:49,127 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2023-11-12 00:07:49,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-12 00:07:49,128 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:49,128 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2023-11-12 00:07:49,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:49,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:07:49,333 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:49,334 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:49,334 INFO L85 PathProgramCache]: Analyzing trace with hash -1340917600, now seen corresponding path program 1 times [2023-11-12 00:07:49,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:49,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918325168] [2023-11-12 00:07:49,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:49,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:49,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:49,411 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:49,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:49,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918325168] [2023-11-12 00:07:49,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918325168] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:49,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230234211] [2023-11-12 00:07:49,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:49,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:49,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:49,413 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:49,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:07:49,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:49,487 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:07:49,488 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:49,505 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:49,505 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:49,541 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:07:49,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230234211] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:49,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [674979079] [2023-11-12 00:07:49,544 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-12 00:07:49,544 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:49,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:49,544 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:49,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:49,773 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:49,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '976#(and (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (exists ((|v_#valid_56| (Array Int Int)) (|v_ULTIMATE.start_main_~#string_B~0#1.base_32| Int) (|v_ULTIMATE.start_main_~#string_A~0#1.base_32| Int)) (and (not (= (select (select |#memory_int| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|) 4) 0)) (= (select |v_#valid_56| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|) 1) (= (store (store |v_#valid_56| |v_ULTIMATE.start_main_~#string_A~0#1.base_32| 0) |v_ULTIMATE.start_main_~#string_B~0#1.base_32| 0) |#valid|) (<= 2 |v_ULTIMATE.start_main_~#string_B~0#1.base_32|) (<= 5 (select |#length| |v_ULTIMATE.start_main_~#string_A~0#1.base_32|)) (<= 2 |v_ULTIMATE.start_main_~#string_A~0#1.base_32|))) (= |ULTIMATE.start_main_~found~0#1| 0) (= |ULTIMATE.start_main_#res#1| 0))' at error location [2023-11-12 00:07:49,986 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:49,986 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:49,986 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 6 [2023-11-12 00:07:49,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657072876] [2023-11-12 00:07:49,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:49,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:07:49,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:49,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:07:49,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-12 00:07:49,988 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:50,068 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2023-11-12 00:07:50,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:07:50,069 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-12 00:07:50,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:50,069 INFO L225 Difference]: With dead ends: 74 [2023-11-12 00:07:50,070 INFO L226 Difference]: Without dead ends: 74 [2023-11-12 00:07:50,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2023-11-12 00:07:50,071 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 67 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:50,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 83 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:50,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-12 00:07:50,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 53. [2023-11-12 00:07:50,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 41 states have (on average 1.6585365853658536) internal successors, (68), 52 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2023-11-12 00:07:50,075 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 13 [2023-11-12 00:07:50,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:50,076 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2023-11-12 00:07:50,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,076 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2023-11-12 00:07:50,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:07:50,076 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:50,076 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1] [2023-11-12 00:07:50,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:50,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:50,282 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:50,283 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:50,283 INFO L85 PathProgramCache]: Analyzing trace with hash 298298466, now seen corresponding path program 2 times [2023-11-12 00:07:50,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:50,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271314060] [2023-11-12 00:07:50,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:50,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:50,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:50,453 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:50,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:50,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271314060] [2023-11-12 00:07:50,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271314060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:50,454 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:50,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:07:50,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104340929] [2023-11-12 00:07:50,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:50,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:07:50,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:50,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:07:50,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:07:50,456 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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) [2023-11-12 00:07:50,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:50,515 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2023-11-12 00:07:50,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:07:50,516 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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 15 [2023-11-12 00:07:50,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:50,517 INFO L225 Difference]: With dead ends: 52 [2023-11-12 00:07:50,517 INFO L226 Difference]: Without dead ends: 50 [2023-11-12 00:07:50,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:07:50,518 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:50,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 28 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:50,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-12 00:07:50,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-12 00:07:50,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2023-11-12 00:07:50,522 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 15 [2023-11-12 00:07:50,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:50,522 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2023-11-12 00:07:50,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 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) [2023-11-12 00:07:50,522 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2023-11-12 00:07:50,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:07:50,523 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:50,523 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:50,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-12 00:07:50,523 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:50,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:50,524 INFO L85 PathProgramCache]: Analyzing trace with hash 657316744, now seen corresponding path program 1 times [2023-11-12 00:07:50,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:50,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867369933] [2023-11-12 00:07:50,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:50,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:50,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:50,572 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:50,572 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:50,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867369933] [2023-11-12 00:07:50,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867369933] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:50,572 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:50,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-12 00:07:50,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905330874] [2023-11-12 00:07:50,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:50,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:07:50,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:50,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:07:50,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:50,574 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:50,599 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2023-11-12 00:07:50,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:07:50,600 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:07:50,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:50,601 INFO L225 Difference]: With dead ends: 46 [2023-11-12 00:07:50,601 INFO L226 Difference]: Without dead ends: 46 [2023-11-12 00:07:50,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:07:50,602 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 25 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:50,604 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:07:50,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-12 00:07:50,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-12 00:07:50,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 39 states have (on average 1.3846153846153846) internal successors, (54), 45 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2023-11-12 00:07:50,610 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 16 [2023-11-12 00:07:50,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:50,610 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2023-11-12 00:07:50,611 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,611 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2023-11-12 00:07:50,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-12 00:07:50,612 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:50,612 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:50,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-12 00:07:50,612 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:50,613 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:50,613 INFO L85 PathProgramCache]: Analyzing trace with hash 657316745, now seen corresponding path program 1 times [2023-11-12 00:07:50,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:50,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749369384] [2023-11-12 00:07:50,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:50,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:50,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:50,723 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:50,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:50,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749369384] [2023-11-12 00:07:50,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1749369384] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:50,724 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:50,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:07:50,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794207414] [2023-11-12 00:07:50,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:50,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:07:50,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:50,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:07:50,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:07:50,728 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:50,786 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2023-11-12 00:07:50,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:07:50,789 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-12 00:07:50,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:50,790 INFO L225 Difference]: With dead ends: 54 [2023-11-12 00:07:50,790 INFO L226 Difference]: Without dead ends: 54 [2023-11-12 00:07:50,791 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:07:50,791 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 44 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:50,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:50,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-12 00:07:50,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2023-11-12 00:07:50,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.3333333333333333) internal successors, (52), 44 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2023-11-12 00:07:50,802 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 16 [2023-11-12 00:07:50,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:50,802 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2023-11-12 00:07:50,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:50,803 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2023-11-12 00:07:50,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-12 00:07:50,804 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:50,804 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:50,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-12 00:07:50,805 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:50,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:50,806 INFO L85 PathProgramCache]: Analyzing trace with hash 321296656, now seen corresponding path program 1 times [2023-11-12 00:07:50,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:50,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692254181] [2023-11-12 00:07:50,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:50,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:50,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:50,945 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:50,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:50,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692254181] [2023-11-12 00:07:50,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692254181] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:50,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777024458] [2023-11-12 00:07:50,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:50,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:50,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:50,952 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:50,971 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:07:51,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:51,030 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:07:51,032 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:51,041 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-12 00:07:51,122 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:51,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:51,221 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:51,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777024458] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:51,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2023951693] [2023-11-12 00:07:51,225 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:07:51,226 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:51,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:51,226 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:51,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:51,622 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:51,878 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1524#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~i~0#1|) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet5#1|)) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= |ULTIMATE.start_main_#t~nondet5#1| 127) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:51,878 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:51,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:51,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-11-12 00:07:51,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167512521] [2023-11-12 00:07:51,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:51,879 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:07:51,879 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:51,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:07:51,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:07:51,880 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:52,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:52,015 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2023-11-12 00:07:52,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:07:52,015 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 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 [2023-11-12 00:07:52,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:52,016 INFO L225 Difference]: With dead ends: 54 [2023-11-12 00:07:52,016 INFO L226 Difference]: Without dead ends: 54 [2023-11-12 00:07:52,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2023-11-12 00:07:52,017 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 63 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:52,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 28 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:52,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-11-12 00:07:52,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 45. [2023-11-12 00:07:52,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 44 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:52,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2023-11-12 00:07:52,020 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 18 [2023-11-12 00:07:52,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:52,020 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2023-11-12 00:07:52,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:52,020 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2023-11-12 00:07:52,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:07:52,021 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:52,021 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1] [2023-11-12 00:07:52,035 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-12 00:07:52,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:52,226 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:52,226 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:52,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1942417189, now seen corresponding path program 2 times [2023-11-12 00:07:52,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:52,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940002860] [2023-11-12 00:07:52,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:52,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:52,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:52,434 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:52,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:52,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940002860] [2023-11-12 00:07:52,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940002860] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:52,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184874770] [2023-11-12 00:07:52,435 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:07:52,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:52,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:52,437 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:52,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:07:52,539 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:07:52,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:07:52,540 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:07:52,544 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:52,556 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:07:52,672 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-11-12 00:07:52,672 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:07:52,673 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184874770] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:52,673 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:07:52,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 9 [2023-11-12 00:07:52,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510463579] [2023-11-12 00:07:52,673 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:52,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:07:52,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:52,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:07:52,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:07:52,675 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 5 states, 4 states have (on average 2.75) 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) [2023-11-12 00:07:52,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:52,732 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2023-11-12 00:07:52,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:07:52,733 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.75) 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 24 [2023-11-12 00:07:52,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:52,734 INFO L225 Difference]: With dead ends: 44 [2023-11-12 00:07:52,734 INFO L226 Difference]: Without dead ends: 44 [2023-11-12 00:07:52,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:07:52,735 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:52,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 23 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:52,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-12 00:07:52,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2023-11-12 00:07:52,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 43 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) [2023-11-12 00:07:52,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2023-11-12 00:07:52,738 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 24 [2023-11-12 00:07:52,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:52,738 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2023-11-12 00:07:52,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.75) 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) [2023-11-12 00:07:52,739 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2023-11-12 00:07:52,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:07:52,740 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:52,740 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:52,745 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-12 00:07:52,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:52,945 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:52,945 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:52,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1350957417, now seen corresponding path program 1 times [2023-11-12 00:07:52,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:52,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446301909] [2023-11-12 00:07:52,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:52,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:52,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:53,070 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-12 00:07:53,070 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:53,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446301909] [2023-11-12 00:07:53,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446301909] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:53,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927020681] [2023-11-12 00:07:53,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:53,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:53,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:53,072 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:53,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:07:53,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:53,175 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-12 00:07:53,177 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:53,363 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:53,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:53,477 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2023-11-12 00:07:53,589 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:53,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927020681] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:53,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618301226] [2023-11-12 00:07:53,594 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:07:53,594 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:53,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:53,595 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:53,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:54,043 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:54,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1981#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_B~0#1.base|) 4) 0) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) 0) (= (select |#valid| |ULTIMATE.start_main_~#string_B~0#1.base|) 1) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= 5 (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|)) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:54,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:54,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:54,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 7, 7] total 16 [2023-11-12 00:07:54,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729738243] [2023-11-12 00:07:54,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:54,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 00:07:54,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:54,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 00:07:54,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=469, Unknown=0, NotChecked=0, Total=650 [2023-11-12 00:07:54,414 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 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) [2023-11-12 00:07:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:54,716 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2023-11-12 00:07:54,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 00:07:54,717 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 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 28 [2023-11-12 00:07:54,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:54,717 INFO L225 Difference]: With dead ends: 64 [2023-11-12 00:07:54,717 INFO L226 Difference]: Without dead ends: 64 [2023-11-12 00:07:54,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=348, Invalid=912, Unknown=0, NotChecked=0, Total=1260 [2023-11-12 00:07:54,719 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 228 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:54,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 31 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:07:54,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-12 00:07:54,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 52. [2023-11-12 00:07:54,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 51 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) [2023-11-12 00:07:54,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2023-11-12 00:07:54,721 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 28 [2023-11-12 00:07:54,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:54,721 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2023-11-12 00:07:54,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 17 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) [2023-11-12 00:07:54,722 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2023-11-12 00:07:54,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-12 00:07:54,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:54,723 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:54,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:07:54,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:54,923 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:54,924 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:54,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1766118786, now seen corresponding path program 1 times [2023-11-12 00:07:54,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:54,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526111698] [2023-11-12 00:07:54,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:54,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:54,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:55,072 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:07:55,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:55,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526111698] [2023-11-12 00:07:55,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526111698] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:07:55,074 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:07:55,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:07:55,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791812655] [2023-11-12 00:07:55,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:07:55,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:07:55,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:55,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:07:55,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:07:55,076 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 5 states, 4 states have (on average 3.75) 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) [2023-11-12 00:07:55,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:55,122 INFO L93 Difference]: Finished difference Result 68 states and 77 transitions. [2023-11-12 00:07:55,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:07:55,123 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) 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 31 [2023-11-12 00:07:55,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:55,123 INFO L225 Difference]: With dead ends: 68 [2023-11-12 00:07:55,123 INFO L226 Difference]: Without dead ends: 68 [2023-11-12 00:07:55,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:07:55,124 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 49 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 19 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 [2023-11-12 00:07:55,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 19 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:07:55,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-12 00:07:55,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 54. [2023-11-12 00:07:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 53 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:55,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2023-11-12 00:07:55,128 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 31 [2023-11-12 00:07:55,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:55,129 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2023-11-12 00:07:55,130 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) 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) [2023-11-12 00:07:55,130 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2023-11-12 00:07:55,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-12 00:07:55,136 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:55,137 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:55,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-12 00:07:55,137 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:55,137 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:55,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1084941211, now seen corresponding path program 1 times [2023-11-12 00:07:55,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:55,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410562952] [2023-11-12 00:07:55,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:55,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:55,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:55,326 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:07:55,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:55,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410562952] [2023-11-12 00:07:55,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410562952] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:55,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907581655] [2023-11-12 00:07:55,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:55,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:55,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:55,329 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:55,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:07:55,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:55,437 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:07:55,441 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:55,663 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:55,664 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:55,833 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-12 00:07:55,995 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:55,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907581655] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:55,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092004568] [2023-11-12 00:07:55,998 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 00:07:55,999 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:55,999 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:55,999 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:55,999 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:56,474 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:56,917 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2463#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:56,917 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:56,917 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:56,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 9] total 23 [2023-11-12 00:07:56,918 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454386164] [2023-11-12 00:07:56,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:56,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-12 00:07:56,918 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:56,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-12 00:07:56,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=874, Unknown=0, NotChecked=0, Total=1122 [2023-11-12 00:07:56,920 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:57,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:07:57,694 INFO L93 Difference]: Finished difference Result 138 states and 149 transitions. [2023-11-12 00:07:57,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-12 00:07:57,695 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-11-12 00:07:57,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:07:57,696 INFO L225 Difference]: With dead ends: 138 [2023-11-12 00:07:57,696 INFO L226 Difference]: Without dead ends: 138 [2023-11-12 00:07:57,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 764 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=622, Invalid=2134, Unknown=0, NotChecked=0, Total=2756 [2023-11-12 00:07:57,698 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 547 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:07:57,699 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [547 Valid, 140 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:07:57,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-12 00:07:57,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 60. [2023-11-12 00:07:57,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:57,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 70 transitions. [2023-11-12 00:07:57,702 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 70 transitions. Word has length 32 [2023-11-12 00:07:57,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:07:57,703 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 70 transitions. [2023-11-12 00:07:57,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 24 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:07:57,703 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 70 transitions. [2023-11-12 00:07:57,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-12 00:07:57,704 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:07:57,704 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:07:57,715 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-12 00:07:57,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-12 00:07:57,910 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:07:57,910 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:07:57,910 INFO L85 PathProgramCache]: Analyzing trace with hash -728070793, now seen corresponding path program 1 times [2023-11-12 00:07:57,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:07:57,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519051246] [2023-11-12 00:07:57,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:57,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:07:57,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:07:58,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:07:58,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519051246] [2023-11-12 00:07:58,085 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519051246] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:07:58,085 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214882288] [2023-11-12 00:07:58,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:07:58,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:07:58,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:07:58,086 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:07:58,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:07:58,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:07:58,199 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 00:07:58,202 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:07:58,370 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:58,371 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:07:58,467 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-12 00:07:58,618 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:07:58,618 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214882288] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:07:58,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1332575477] [2023-11-12 00:07:58,621 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:07:58,621 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:07:58,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:07:58,621 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:07:58,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:07:59,046 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:07:59,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2923#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~nc_B~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:07:59,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:07:59,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:07:59,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 9, 9] total 21 [2023-11-12 00:07:59,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121939108] [2023-11-12 00:07:59,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:07:59,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-12 00:07:59,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:07:59,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-12 00:07:59,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=866, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:07:59,712 INFO L87 Difference]: Start difference. First operand 60 states and 70 transitions. Second operand has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:00,312 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2023-11-12 00:08:00,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-12 00:08:00,312 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2023-11-12 00:08:00,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:00,314 INFO L225 Difference]: With dead ends: 180 [2023-11-12 00:08:00,314 INFO L226 Difference]: Without dead ends: 180 [2023-11-12 00:08:00,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 914 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=698, Invalid=2164, Unknown=0, NotChecked=0, Total=2862 [2023-11-12 00:08:00,316 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 536 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 536 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:00,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [536 Valid, 55 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:08:00,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-11-12 00:08:00,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 72. [2023-11-12 00:08:00,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 71 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2023-11-12 00:08:00,327 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 33 [2023-11-12 00:08:00,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:00,328 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2023-11-12 00:08:00,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 22 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,329 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2023-11-12 00:08:00,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-12 00:08:00,331 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:00,331 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:00,338 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:00,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-12 00:08:00,538 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:00,538 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:00,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1478308976, now seen corresponding path program 1 times [2023-11-12 00:08:00,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:00,539 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075032964] [2023-11-12 00:08:00,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:00,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:00,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:00,627 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-12 00:08:00,628 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:00,628 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075032964] [2023-11-12 00:08:00,628 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075032964] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:08:00,628 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:08:00,629 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:08:00,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86382703] [2023-11-12 00:08:00,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:08:00,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:08:00,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:00,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:08:00,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:08:00,631 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:00,666 INFO L93 Difference]: Finished difference Result 80 states and 95 transitions. [2023-11-12 00:08:00,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:08:00,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-11-12 00:08:00,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:00,668 INFO L225 Difference]: With dead ends: 80 [2023-11-12 00:08:00,669 INFO L226 Difference]: Without dead ends: 80 [2023-11-12 00:08:00,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:08:00,670 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:00,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 50 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:08:00,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-12 00:08:00,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2023-11-12 00:08:00,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 71 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2023-11-12 00:08:00,677 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 37 [2023-11-12 00:08:00,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:00,677 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2023-11-12 00:08:00,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,678 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2023-11-12 00:08:00,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-12 00:08:00,679 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:00,679 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:00,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-12 00:08:00,680 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:00,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:00,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1307476100, now seen corresponding path program 1 times [2023-11-12 00:08:00,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:00,681 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146962790] [2023-11-12 00:08:00,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:00,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:00,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:00,852 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:08:00,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:00,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146962790] [2023-11-12 00:08:00,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146962790] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:08:00,853 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:08:00,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-12 00:08:00,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145188311] [2023-11-12 00:08:00,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:08:00,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:08:00,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:00,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:08:00,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:08:00,856 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:00,906 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2023-11-12 00:08:00,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:08:00,907 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-11-12 00:08:00,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:00,908 INFO L225 Difference]: With dead ends: 72 [2023-11-12 00:08:00,908 INFO L226 Difference]: Without dead ends: 66 [2023-11-12 00:08:00,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:08:00,909 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:00,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 61 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:08:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-12 00:08:00,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-12 00:08:00,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 62 states have (on average 1.2419354838709677) internal successors, (77), 65 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) [2023-11-12 00:08:00,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 77 transitions. [2023-11-12 00:08:00,912 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 77 transitions. Word has length 37 [2023-11-12 00:08:00,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:00,913 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 77 transitions. [2023-11-12 00:08:00,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:00,913 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 77 transitions. [2023-11-12 00:08:00,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-12 00:08:00,914 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:00,915 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:00,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-11-12 00:08:00,916 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:00,916 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:00,916 INFO L85 PathProgramCache]: Analyzing trace with hash -842701306, now seen corresponding path program 2 times [2023-11-12 00:08:00,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:00,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570840033] [2023-11-12 00:08:00,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:00,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:00,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:01,682 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 5 proven. 45 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-12 00:08:01,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:01,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570840033] [2023-11-12 00:08:01,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570840033] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:08:01,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24525702] [2023-11-12 00:08:01,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:08:01,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:01,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:08:01,688 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:08:01,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:08:01,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-12 00:08:01,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:08:01,829 INFO L262 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-12 00:08:01,835 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:08:01,848 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-12 00:08:01,858 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:08:01,994 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-12 00:08:02,195 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:08:02,242 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:08:02,280 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:08:02,327 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:08:02,355 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-12 00:08:02,530 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:08:02,531 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2023-11-12 00:08:02,639 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 14 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-12 00:08:02,639 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:08:03,143 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:08:03,148 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 39 [2023-11-12 00:08:03,154 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 58 [2023-11-12 00:08:03,161 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2023-11-12 00:08:03,181 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:08:03,182 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 60 treesize of output 62 [2023-11-12 00:08:03,429 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-12 00:08:03,429 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24525702] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:08:03,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1659083604] [2023-11-12 00:08:03,433 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-12 00:08:03,433 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:08:03,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:08:03,434 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:08:03,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:08:03,842 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:08:04,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3786#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:08:04,461 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:08:04,461 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:08:04,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9, 9] total 35 [2023-11-12 00:08:04,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881435963] [2023-11-12 00:08:04,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:08:04,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-12 00:08:04,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:04,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-12 00:08:04,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1799, Unknown=1, NotChecked=0, Total=1980 [2023-11-12 00:08:04,465 INFO L87 Difference]: Start difference. First operand 66 states and 77 transitions. Second operand has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:06,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:06,304 INFO L93 Difference]: Finished difference Result 132 states and 150 transitions. [2023-11-12 00:08:06,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-12 00:08:06,305 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2023-11-12 00:08:06,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:06,306 INFO L225 Difference]: With dead ends: 132 [2023-11-12 00:08:06,306 INFO L226 Difference]: Without dead ends: 132 [2023-11-12 00:08:06,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=830, Invalid=4869, Unknown=1, NotChecked=0, Total=5700 [2023-11-12 00:08:06,309 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 753 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 1045 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 753 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 1045 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:06,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [753 Valid, 263 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 1045 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-12 00:08:06,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-12 00:08:06,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 66. [2023-11-12 00:08:06,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 63 states have (on average 1.2063492063492063) internal successors, (76), 65 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:06,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2023-11-12 00:08:06,313 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 38 [2023-11-12 00:08:06,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:06,313 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2023-11-12 00:08:06,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 35 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:06,314 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2023-11-12 00:08:06,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-12 00:08:06,314 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:06,314 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:06,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:06,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:06,523 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:06,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:06,524 INFO L85 PathProgramCache]: Analyzing trace with hash -808863518, now seen corresponding path program 2 times [2023-11-12 00:08:06,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:06,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541607636] [2023-11-12 00:08:06,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:06,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:06,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:06,762 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:08:06,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:06,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541607636] [2023-11-12 00:08:06,763 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541607636] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:08:06,763 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791082534] [2023-11-12 00:08:06,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:08:06,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:06,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:08:06,765 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:08:06,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 00:08:06,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:08:06,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:08:06,897 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 00:08:06,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:08:06,915 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-11-12 00:08:07,227 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-12 00:08:07,227 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 15 [2023-11-12 00:08:07,327 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:08:07,328 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:08:07,495 INFO L322 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2023-11-12 00:08:07,495 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 15 [2023-11-12 00:08:07,768 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-12 00:08:07,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791082534] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:08:07,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1174507070] [2023-11-12 00:08:07,773 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:08:07,773 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:08:07,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:08:07,774 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:08:07,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:08:08,210 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:08:08,937 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4306#(and (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= |ULTIMATE.start_main_~nc_A~0#1| 0) (<= (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~nc_B~0#1|) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~found~0#1| 0))' at error location [2023-11-12 00:08:08,938 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:08:08,938 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:08:08,938 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 21 [2023-11-12 00:08:08,938 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470344422] [2023-11-12 00:08:08,938 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:08:08,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-12 00:08:08,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:08,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-12 00:08:08,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1016, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:08:08,940 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:09,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:09,747 INFO L93 Difference]: Finished difference Result 119 states and 127 transitions. [2023-11-12 00:08:09,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:08:09,748 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2023-11-12 00:08:09,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:09,749 INFO L225 Difference]: With dead ends: 119 [2023-11-12 00:08:09,749 INFO L226 Difference]: Without dead ends: 108 [2023-11-12 00:08:09,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=488, Invalid=2268, Unknown=0, NotChecked=0, Total=2756 [2023-11-12 00:08:09,751 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 374 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 374 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:09,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [374 Valid, 54 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:08:09,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-11-12 00:08:09,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 56. [2023-11-12 00:08:09,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 55 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:09,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 64 transitions. [2023-11-12 00:08:09,756 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 64 transitions. Word has length 39 [2023-11-12 00:08:09,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:09,757 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 64 transitions. [2023-11-12 00:08:09,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 2.9545454545454546) internal successors, (65), 22 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:09,757 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 64 transitions. [2023-11-12 00:08:09,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-12 00:08:09,757 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:09,758 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:09,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:09,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:09,964 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:09,964 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:09,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1619711232, now seen corresponding path program 1 times [2023-11-12 00:08:09,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:09,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999943390] [2023-11-12 00:08:09,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:09,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:10,072 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-12 00:08:10,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:10,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999943390] [2023-11-12 00:08:10,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999943390] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:08:10,072 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:08:10,073 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:08:10,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245783780] [2023-11-12 00:08:10,073 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:08:10,073 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:08:10,073 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:10,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:08:10,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:08:10,074 INFO L87 Difference]: Start difference. First operand 56 states and 64 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:10,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:10,107 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-11-12 00:08:10,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:08:10,108 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 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 40 [2023-11-12 00:08:10,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:10,108 INFO L225 Difference]: With dead ends: 57 [2023-11-12 00:08:10,108 INFO L226 Difference]: Without dead ends: 57 [2023-11-12 00:08:10,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:08:10,110 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 20 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:10,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 19 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:08:10,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-12 00:08:10,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2023-11-12 00:08:10,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 55 states have (on average 1.1818181818181819) internal successors, (65), 56 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:10,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2023-11-12 00:08:10,113 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 40 [2023-11-12 00:08:10,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:10,113 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2023-11-12 00:08:10,113 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:10,113 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2023-11-12 00:08:10,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-12 00:08:10,114 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:10,114 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:10,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-11-12 00:08:10,115 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:10,115 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:10,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1764378191, now seen corresponding path program 1 times [2023-11-12 00:08:10,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:10,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583831810] [2023-11-12 00:08:10,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:10,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:10,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:10,286 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-12 00:08:10,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:10,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583831810] [2023-11-12 00:08:10,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583831810] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:08:10,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519764927] [2023-11-12 00:08:10,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:10,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:10,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:08:10,292 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:08:10,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-12 00:08:10,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:10,423 INFO L262 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:08:10,426 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:08:10,761 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 36 [2023-11-12 00:08:10,803 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 21 proven. 8 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-12 00:08:10,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:08:10,875 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 42 [2023-11-12 00:08:11,201 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2023-11-12 00:08:11,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519764927] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:08:11,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [422230523] [2023-11-12 00:08:11,207 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:08:11,207 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:08:11,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:08:11,208 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:08:11,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:08:11,839 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:08:15,183 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4915#(and (or (and (<= (+ |ULTIMATE.start_main_~nc_B~0#1| 1) (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|)) (<= 2 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= 1 |ULTIMATE.start_main_~nc_A~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= (select |#valid| |ULTIMATE.start_main_~#string_B~0#1.base|) 1) (= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_B~0#1.base|) |ULTIMATE.start_main_~nc_B~0#1|) 0) (= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 2 |ULTIMATE.start_main_~#string_B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~found~0#1| 0) (<= |ULTIMATE.start_main_~nc_A~0#1| |ULTIMATE.start_main_~nc_B~0#1|)) (and (exists ((|v_ULTIMATE.start_main_#t~post13#1_18| Int) (|v_ULTIMATE.start_main_#t~mem11#1_21| Int) (|v_ULTIMATE.start_main_#t~post14#1_18| Int) (|v_ULTIMATE.start_main_~i~0#1_219| Int) (|v_ULTIMATE.start_main_~j~0#1_30| Int)) (and (<= (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |v_ULTIMATE.start_main_~j~0#1_30| 1) (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|)) (or (and (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_B~0#1.base|) (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |v_ULTIMATE.start_main_~j~0#1_30|)) |v_ULTIMATE.start_main_#t~mem11#1_21|) (= |ULTIMATE.start_main_~i~0#1| (+ |v_ULTIMATE.start_main_~i~0#1_219| 1)) (= (+ |v_ULTIMATE.start_main_~j~0#1_30| 1) |ULTIMATE.start_main_~j~0#1|)) (and (= |v_ULTIMATE.start_main_#t~post14#1_18| |ULTIMATE.start_main_#t~post14#1|) (= |v_ULTIMATE.start_main_#t~post13#1_18| |ULTIMATE.start_main_#t~post13#1|) (= |ULTIMATE.start_main_~j~0#1| 0) (= (+ |v_ULTIMATE.start_main_~i~0#1_219| 1) (+ |v_ULTIMATE.start_main_~j~0#1_30| |ULTIMATE.start_main_~i~0#1|)) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_B~0#1.base|) (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |v_ULTIMATE.start_main_~j~0#1_30|)) |v_ULTIMATE.start_main_#t~mem11#1_21|)))) (<= 0 (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |v_ULTIMATE.start_main_~j~0#1_30|)))) (= (select |#valid| |ULTIMATE.start_main_~#string_B~0#1.base|) 1) (<= (+ |ULTIMATE.start_main_~j~0#1| 1) |ULTIMATE.start_main_~nc_B~0#1|) (<= (+ |ULTIMATE.start_main_~i~0#1| 1) |ULTIMATE.start_main_~nc_A~0#1|))) (or (< (select |#length| |ULTIMATE.start_main_~#string_A~0#1.base|) (+ |ULTIMATE.start_main_~i~0#1| 1 |ULTIMATE.start_main_~#string_A~0#1.offset|)) (< (+ |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~#string_A~0#1.offset|) 0)))' at error location [2023-11-12 00:08:15,184 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:08:15,184 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:08:15,184 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 6] total 21 [2023-11-12 00:08:15,184 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341318867] [2023-11-12 00:08:15,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:08:15,185 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-12 00:08:15,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:15,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-12 00:08:15,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1061, Unknown=1, NotChecked=0, Total=1260 [2023-11-12 00:08:15,186 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:15,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:15,931 INFO L93 Difference]: Finished difference Result 84 states and 97 transitions. [2023-11-12 00:08:15,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-12 00:08:15,932 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 0 states have call successors, (0), 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 [2023-11-12 00:08:15,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:15,932 INFO L225 Difference]: With dead ends: 84 [2023-11-12 00:08:15,932 INFO L226 Difference]: Without dead ends: 68 [2023-11-12 00:08:15,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 800 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=457, Invalid=2512, Unknown=1, NotChecked=0, Total=2970 [2023-11-12 00:08:15,934 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 114 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:15,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 42 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:08:15,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-12 00:08:15,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 56. [2023-11-12 00:08:15,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 55 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:15,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2023-11-12 00:08:15,937 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 42 [2023-11-12 00:08:15,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:15,937 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2023-11-12 00:08:15,937 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 21 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:15,937 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2023-11-12 00:08:15,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-12 00:08:15,938 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:15,938 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:15,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:16,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-11-12 00:08:16,143 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:16,143 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:16,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1368104863, now seen corresponding path program 1 times [2023-11-12 00:08:16,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:16,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291999089] [2023-11-12 00:08:16,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:16,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:16,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:16,271 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-11-12 00:08:16,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:16,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291999089] [2023-11-12 00:08:16,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291999089] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:08:16,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943167367] [2023-11-12 00:08:16,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:16,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:16,272 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:08:16,273 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:08:16,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-12 00:08:16,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:16,408 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:08:16,409 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:08:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-11-12 00:08:16,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:08:16,520 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-11-12 00:08:16,520 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943167367] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:08:16,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486839776] [2023-11-12 00:08:16,522 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:08:16,524 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:08:16,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:08:16,525 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:08:16,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:08:17,117 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:08:20,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5383#(or (< (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |ULTIMATE.start_main_~j~0#1| 1)) (< (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |ULTIMATE.start_main_~j~0#1|) 0))' at error location [2023-11-12 00:08:20,000 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:08:20,000 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:08:20,000 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-11-12 00:08:20,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707999049] [2023-11-12 00:08:20,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:08:20,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:08:20,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:20,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:08:20,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=546, Unknown=1, NotChecked=0, Total=650 [2023-11-12 00:08:20,002 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:20,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:20,056 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2023-11-12 00:08:20,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:08:20,057 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 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 45 [2023-11-12 00:08:20,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:20,058 INFO L225 Difference]: With dead ends: 57 [2023-11-12 00:08:20,058 INFO L226 Difference]: Without dead ends: 56 [2023-11-12 00:08:20,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 112 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=103, Invalid=546, Unknown=1, NotChecked=0, Total=650 [2023-11-12 00:08:20,059 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 9 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:20,059 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 47 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:08:20,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-12 00:08:20,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2023-11-12 00:08:20,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.1272727272727272) internal successors, (62), 55 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:20,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2023-11-12 00:08:20,062 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 45 [2023-11-12 00:08:20,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:20,062 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2023-11-12 00:08:20,062 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 11 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:20,063 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2023-11-12 00:08:20,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-12 00:08:20,063 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:08:20,063 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:20,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:20,269 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2023-11-12 00:08:20,270 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 15 more)] === [2023-11-12 00:08:20,270 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:08:20,270 INFO L85 PathProgramCache]: Analyzing trace with hash -7631718, now seen corresponding path program 2 times [2023-11-12 00:08:20,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:08:20,270 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926800100] [2023-11-12 00:08:20,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:08:20,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:08:20,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:08:20,468 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-11-12 00:08:20,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:08:20,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926800100] [2023-11-12 00:08:20,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926800100] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:08:20,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653859131] [2023-11-12 00:08:20,469 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:08:20,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:08:20,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:08:20,470 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:08:20,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-11-12 00:08:20,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:08:20,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:08:20,602 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:08:20,609 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:08:20,750 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 36 [2023-11-12 00:08:20,800 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-12 00:08:20,801 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:08:20,861 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 42 [2023-11-12 00:08:21,020 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-12 00:08:21,082 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-12 00:08:21,082 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653859131] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:08:21,082 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1242314234] [2023-11-12 00:08:21,084 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-12 00:08:21,084 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:08:21,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:08:21,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:08:21,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:08:21,591 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:08:22,722 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5801#(or (< (select |#length| |ULTIMATE.start_main_~#string_B~0#1.base|) (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |ULTIMATE.start_main_~j~0#1| 1)) (< (+ |ULTIMATE.start_main_~#string_B~0#1.offset| |ULTIMATE.start_main_~j~0#1|) 0))' at error location [2023-11-12 00:08:22,722 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:08:22,722 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:08:22,722 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5] total 12 [2023-11-12 00:08:22,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149337210] [2023-11-12 00:08:22,723 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:08:22,723 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:08:22,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:08:22,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:08:22,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=671, Unknown=0, NotChecked=0, Total=812 [2023-11-12 00:08:22,725 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 14 states, 13 states have (on average 4.615384615384615) internal successors, (60), 13 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:22,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:08:22,905 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2023-11-12 00:08:22,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:08:22,906 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.615384615384615) internal successors, (60), 13 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 47 [2023-11-12 00:08:22,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:08:22,906 INFO L225 Difference]: With dead ends: 59 [2023-11-12 00:08:22,906 INFO L226 Difference]: Without dead ends: 0 [2023-11-12 00:08:22,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2023-11-12 00:08:22,907 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 13 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:08:22,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 42 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:08:22,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-11-12 00:08:22,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-11-12 00:08:22,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:22,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-11-12 00:08:22,909 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 47 [2023-11-12 00:08:22,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:08:22,909 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-11-12 00:08:22,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.615384615384615) internal successors, (60), 13 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:08:22,909 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-11-12 00:08:22,909 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-11-12 00:08:22,912 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE (17 of 18 remaining) [2023-11-12 00:08:22,912 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (16 of 18 remaining) [2023-11-12 00:08:22,913 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (15 of 18 remaining) [2023-11-12 00:08:22,913 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE (14 of 18 remaining) [2023-11-12 00:08:22,913 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE (13 of 18 remaining) [2023-11-12 00:08:22,913 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE (12 of 18 remaining) [2023-11-12 00:08:22,913 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE (11 of 18 remaining) [2023-11-12 00:08:22,914 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE (10 of 18 remaining) [2023-11-12 00:08:22,914 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE (9 of 18 remaining) [2023-11-12 00:08:22,914 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE (8 of 18 remaining) [2023-11-12 00:08:22,914 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE (7 of 18 remaining) [2023-11-12 00:08:22,914 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE (6 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE (5 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE (4 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr14REQUIRES_VIOLATIONMEMORY_DEREFERENCE (3 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE (2 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr16ASSERT_VIOLATIONMEMORY_LEAK (1 of 18 remaining) [2023-11-12 00:08:22,915 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr17ASSERT_VIOLATIONMEMORY_LEAK (0 of 18 remaining) [2023-11-12 00:08:22,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-11-12 00:08:23,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-11-12 00:08:23,124 INFO L445 BasicCegarLoop]: Path program histogram: [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:08:23,126 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2023-11-12 00:08:23,129 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.11 12:08:23 BoogieIcfgContainer [2023-11-12 00:08:23,129 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-12 00:08:23,129 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-12 00:08:23,129 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-12 00:08:23,130 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-12 00:08:23,130 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:07:44" (3/4) ... [2023-11-12 00:08:23,132 INFO L137 WitnessPrinter]: Generating witness for correct program [2023-11-12 00:08:23,139 INFO L944 BoogieBacktranslator]: Reduced CFG by removing 27 nodes and edges [2023-11-12 00:08:23,140 INFO L944 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2023-11-12 00:08:23,140 INFO L944 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2023-11-12 00:08:23,141 INFO L944 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2023-11-12 00:08:23,231 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/witness.graphml [2023-11-12 00:08:23,231 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/witness.yml [2023-11-12 00:08:23,231 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-12 00:08:23,232 INFO L158 Benchmark]: Toolchain (without parser) took 40112.69ms. Allocated memory was 134.2MB in the beginning and 249.6MB in the end (delta: 115.3MB). Free memory was 104.6MB in the beginning and 186.7MB in the end (delta: -82.0MB). Peak memory consumption was 36.4MB. Max. memory is 16.1GB. [2023-11-12 00:08:23,232 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 107.0MB. Free memory is still 61.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-12 00:08:23,233 INFO L158 Benchmark]: CACSL2BoogieTranslator took 295.66ms. Allocated memory is still 134.2MB. Free memory was 104.2MB in the beginning and 93.1MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-12 00:08:23,233 INFO L158 Benchmark]: Boogie Procedure Inliner took 38.69ms. Allocated memory is still 134.2MB. Free memory was 93.1MB in the beginning and 91.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-12 00:08:23,233 INFO L158 Benchmark]: Boogie Preprocessor took 30.05ms. Allocated memory is still 134.2MB. Free memory was 91.1MB in the beginning and 89.9MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-12 00:08:23,234 INFO L158 Benchmark]: RCFGBuilder took 522.72ms. Allocated memory is still 134.2MB. Free memory was 89.9MB in the beginning and 71.8MB in the end (delta: 18.1MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. [2023-11-12 00:08:23,234 INFO L158 Benchmark]: TraceAbstraction took 39111.28ms. Allocated memory was 134.2MB in the beginning and 249.6MB in the end (delta: 115.3MB). Free memory was 71.1MB in the beginning and 191.9MB in the end (delta: -120.8MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-12 00:08:23,235 INFO L158 Benchmark]: Witness Printer took 102.08ms. Allocated memory is still 249.6MB. Free memory was 191.9MB in the beginning and 186.7MB in the end (delta: 5.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2023-11-12 00:08:23,242 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 107.0MB. Free memory is still 61.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 295.66ms. Allocated memory is still 134.2MB. Free memory was 104.2MB in the beginning and 93.1MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 38.69ms. Allocated memory is still 134.2MB. Free memory was 93.1MB in the beginning and 91.1MB in the end (delta: 2.0MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 30.05ms. Allocated memory is still 134.2MB. Free memory was 91.1MB in the beginning and 89.9MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 522.72ms. Allocated memory is still 134.2MB. Free memory was 89.9MB in the beginning and 71.8MB in the end (delta: 18.1MB). Peak memory consumption was 18.9MB. Max. memory is 16.1GB. * TraceAbstraction took 39111.28ms. Allocated memory was 134.2MB in the beginning and 249.6MB in the end (delta: 115.3MB). Free memory was 71.1MB in the beginning and 191.9MB in the end (delta: -120.8MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 102.08ms. Allocated memory is still 249.6MB. Free memory was 191.9MB in the beginning and 186.7MB in the end (delta: 5.2MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: -1]: pointer dereference always succeeds For all program executions holds that pointer dereference always succeeds at this location - PositiveResult [Line: 12]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - PositiveResult [Line: 28]: all allocated memory was freed For all program executions holds that all allocated memory was freed at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 43 locations, 18 error locations. Started 1 CEGAR loops. OverallTime: 39.0s, OverallIterations: 25, TraceHistogramMax: 5, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 6.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 3074 SdHoareTripleChecker+Valid, 3.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 3074 mSDsluCounter, 1377 SdHoareTripleChecker+Invalid, 2.7s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 950 mSDsCounter, 253 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 3506 IncrementalHoareTripleChecker+Invalid, 3759 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 253 mSolverCounterUnsat, 427 mSDtfsCounter, 3506 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1293 GetRequests, 822 SyntacticMatches, 11 SemanticMatches, 460 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5598 ImplicationChecksByTransitivity, 16.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=72occurred in iteration=17, InterpolantAutomatonStates: 223, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 25 MinimizatonAttempts, 431 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 9.9s InterpolantComputationTime, 983 NumberOfCodeBlocks, 919 NumberOfCodeBlocksAsserted, 50 NumberOfCheckSat, 1276 ConstructedInterpolants, 13 QuantifiedInterpolants, 10740 SizeOfPredicates, 52 NumberOfNonLiveVariables, 2254 ConjunctsInSsa, 169 ConjunctsInUnsatCore, 52 InterpolantComputations, 13 PerfectInterpolantSequences, 1686/2015 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 18 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2023-11-12 00:08:23,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d855e1f4-873b-4afb-9ad7-d3f2d72c6a4d/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE