./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety/960521-1-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety/960521-1-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5 --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 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:44:15,291 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:44:15,370 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-21 19:44:15,376 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:44:15,377 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:44:15,405 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:44:15,406 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:44:15,407 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:44:15,407 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:44:15,408 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:44:15,409 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:44:15,409 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:44:15,410 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:44:15,410 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:44:15,411 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:44:15,412 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:44:15,412 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:44:15,413 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:44:15,413 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:44:15,414 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:44:15,415 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:44:15,416 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:44:15,416 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 19:44:15,417 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 19:44:15,418 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:44:15,418 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:44:15,419 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:44:15,419 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:44:15,420 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:44:15,421 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-21 19:44:15,421 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-21 19:44:15,422 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-21 19:44:15,422 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:44:15,422 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-21 19:44:15,423 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 19:44:15,423 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:44:15,424 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:44:15,424 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:44:15,424 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:44:15,425 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:44:15,425 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:44:15,426 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:44:15,426 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:44:15,427 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:44:15,427 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:44:15,427 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:44:15,428 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:44:15,428 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:44:15,428 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_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 19e2947f690bcfa099d607c2a0a6dc0e6f351f54e3f3874a42109cbf9e336957 [2023-11-21 19:44:15,801 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:44:15,834 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:44:15,837 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:44:15,839 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:44:15,839 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:44:15,840 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/memsafety/960521-1-2.i [2023-11-21 19:44:19,012 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:44:19,336 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:44:19,342 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/sv-benchmarks/c/memsafety/960521-1-2.i [2023-11-21 19:44:19,368 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/data/499109666/ebf2887c2e7a444b86637a2ea7642429/FLAG818699bfe [2023-11-21 19:44:19,389 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/data/499109666/ebf2887c2e7a444b86637a2ea7642429 [2023-11-21 19:44:19,395 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:44:19,398 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:44:19,400 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:44:19,400 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:44:19,406 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:44:19,408 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:44:19" (1/1) ... [2023-11-21 19:44:19,418 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f7075d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:19, skipping insertion in model container [2023-11-21 19:44:19,419 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:44:19" (1/1) ... [2023-11-21 19:44:19,526 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:44:19,951 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:44:19,962 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:44:20,008 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:44:20,041 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:44:20,041 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20 WrapperNode [2023-11-21 19:44:20,041 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:44:20,043 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:44:20,043 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:44:20,043 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:44:20,051 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,065 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,095 INFO L138 Inliner]: procedures = 121, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2023-11-21 19:44:20,096 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:44:20,096 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:44:20,097 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:44:20,097 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:44:20,107 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,108 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,127 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,129 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,135 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,156 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,165 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,171 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,173 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:44:20,178 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:44:20,179 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:44:20,179 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:44:20,180 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (1/1) ... [2023-11-21 19:44:20,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:44:20,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:20,220 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:44:20,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:44:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:44:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:44:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 19:44:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:44:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:44:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:44:20,264 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:44:20,264 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:44:20,387 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:44:20,389 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:44:20,651 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:44:20,702 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:44:20,703 INFO L308 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-21 19:44:20,705 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:44:20 BoogieIcfgContainer [2023-11-21 19:44:20,705 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:44:20,708 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:44:20,709 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:44:20,712 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:44:20,713 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:44:19" (1/3) ... [2023-11-21 19:44:20,714 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4054c086 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:44:20, skipping insertion in model container [2023-11-21 19:44:20,714 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:20" (2/3) ... [2023-11-21 19:44:20,715 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4054c086 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:44:20, skipping insertion in model container [2023-11-21 19:44:20,715 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:44:20" (3/3) ... [2023-11-21 19:44:20,716 INFO L112 eAbstractionObserver]: Analyzing ICFG 960521-1-2.i [2023-11-21 19:44:20,740 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:44:20,740 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 21 error locations. [2023-11-21 19:44:20,795 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:44:20,803 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;@1c0c2fec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:44:20,804 INFO L358 AbstractCegarLoop]: Starting to check reachability of 21 error locations. [2023-11-21 19:44:20,809 INFO L276 IsEmpty]: Start isEmpty. Operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 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) [2023-11-21 19:44:20,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-21 19:44:20,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:20,818 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-21 19:44:20,819 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:20,825 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:20,826 INFO L85 PathProgramCache]: Analyzing trace with hash 3445, now seen corresponding path program 1 times [2023-11-21 19:44:20,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:20,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797253081] [2023-11-21 19:44:20,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:20,839 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:20,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:21,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:21,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:21,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797253081] [2023-11-21 19:44:21,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797253081] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:21,188 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:21,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:44:21,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020701923] [2023-11-21 19:44:21,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:21,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:44:21,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:21,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:44:21,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:44:21,240 INFO L87 Difference]: Start difference. First operand has 44 states, 22 states have (on average 2.090909090909091) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:21,361 INFO L93 Difference]: Finished difference Result 43 states and 45 transitions. [2023-11-21 19:44:21,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:44:21,366 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-21 19:44:21,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:21,376 INFO L225 Difference]: With dead ends: 43 [2023-11-21 19:44:21,376 INFO L226 Difference]: Without dead ends: 42 [2023-11-21 19:44:21,378 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 [2023-11-21 19:44:21,382 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:21,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 61 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:44:21,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-21 19:44:21,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-11-21 19:44:21,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 22 states have (on average 2.0) internal successors, (44), 41 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2023-11-21 19:44:21,416 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 2 [2023-11-21 19:44:21,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:21,417 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2023-11-21 19:44:21,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,417 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2023-11-21 19:44:21,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-21 19:44:21,418 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:21,418 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-21 19:44:21,418 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:44:21,419 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:21,419 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:21,420 INFO L85 PathProgramCache]: Analyzing trace with hash 3446, now seen corresponding path program 1 times [2023-11-21 19:44:21,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:21,420 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525625161] [2023-11-21 19:44:21,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:21,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:21,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:21,633 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:21,633 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:21,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525625161] [2023-11-21 19:44:21,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1525625161] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:21,634 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:21,635 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:44:21,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375753850] [2023-11-21 19:44:21,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:21,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:44:21,637 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:21,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:44:21,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:44:21,638 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:21,671 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2023-11-21 19:44:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:44:21,672 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-21 19:44:21,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:21,673 INFO L225 Difference]: With dead ends: 41 [2023-11-21 19:44:21,674 INFO L226 Difference]: Without dead ends: 41 [2023-11-21 19:44:21,674 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 [2023-11-21 19:44:21,676 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:21,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:21,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-21 19:44:21,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-21 19:44:21,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-11-21 19:44:21,685 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 2 [2023-11-21 19:44:21,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:21,685 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-11-21 19:44:21,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,686 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-11-21 19:44:21,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-21 19:44:21,686 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:21,686 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-21 19:44:21,687 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:44:21,687 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:21,688 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:21,688 INFO L85 PathProgramCache]: Analyzing trace with hash 3387014, now seen corresponding path program 1 times [2023-11-21 19:44:21,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:21,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535900842] [2023-11-21 19:44:21,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:21,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:21,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:21,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:21,859 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:21,860 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535900842] [2023-11-21 19:44:21,860 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535900842] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:21,860 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:21,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:44:21,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324015697] [2023-11-21 19:44:21,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:21,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:44:21,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:21,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:44:21,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:44:21,863 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:21,912 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2023-11-21 19:44:21,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:44:21,913 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-21 19:44:21,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:21,914 INFO L225 Difference]: With dead ends: 38 [2023-11-21 19:44:21,914 INFO L226 Difference]: Without dead ends: 38 [2023-11-21 19:44:21,915 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 [2023-11-21 19:44:21,919 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 42 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:21,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 33 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:21,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-21 19:44:21,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-21 19:44:21,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 37 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2023-11-21 19:44:21,927 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 4 [2023-11-21 19:44:21,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:21,927 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2023-11-21 19:44:21,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:21,928 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2023-11-21 19:44:21,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-21 19:44:21,928 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:21,928 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-21 19:44:21,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:44:21,929 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:21,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:21,930 INFO L85 PathProgramCache]: Analyzing trace with hash 3387015, now seen corresponding path program 1 times [2023-11-21 19:44:21,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:21,931 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166755010] [2023-11-21 19:44:21,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:21,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:22,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:22,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:22,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166755010] [2023-11-21 19:44:22,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166755010] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:22,268 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:22,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:44:22,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799809517] [2023-11-21 19:44:22,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:22,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:44:22,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:22,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:44:22,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:44:22,273 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:22,409 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2023-11-21 19:44:22,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:44:22,410 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-21 19:44:22,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:22,414 INFO L225 Difference]: With dead ends: 44 [2023-11-21 19:44:22,414 INFO L226 Difference]: Without dead ends: 44 [2023-11-21 19:44:22,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:44:22,425 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:22,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 85 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:44:22,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-21 19:44:22,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-11-21 19:44:22,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.76) internal successors, (44), 40 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2023-11-21 19:44:22,431 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 4 [2023-11-21 19:44:22,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:22,431 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2023-11-21 19:44:22,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,431 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2023-11-21 19:44:22,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-21 19:44:22,432 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:22,432 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-21 19:44:22,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:44:22,433 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:22,433 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:22,433 INFO L85 PathProgramCache]: Analyzing trace with hash 105068085, now seen corresponding path program 1 times [2023-11-21 19:44:22,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:22,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973036642] [2023-11-21 19:44:22,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:22,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:22,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:22,516 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:22,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973036642] [2023-11-21 19:44:22,517 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973036642] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:22,517 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:22,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:44:22,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372168777] [2023-11-21 19:44:22,517 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:22,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:44:22,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:22,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:44:22,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:44:22,519 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:22,553 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2023-11-21 19:44:22,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:44:22,553 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-21 19:44:22,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:22,555 INFO L225 Difference]: With dead ends: 44 [2023-11-21 19:44:22,555 INFO L226 Difference]: Without dead ends: 44 [2023-11-21 19:44:22,555 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:44:22,557 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:22,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 61 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:22,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-21 19:44:22,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2023-11-21 19:44:22,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.72) internal successors, (43), 40 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2023-11-21 19:44:22,572 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 5 [2023-11-21 19:44:22,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:22,573 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2023-11-21 19:44:22,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:22,573 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2023-11-21 19:44:22,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-21 19:44:22,574 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:22,574 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2023-11-21 19:44:22,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:44:22,575 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:22,576 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:22,576 INFO L85 PathProgramCache]: Analyzing trace with hash -1039982965, now seen corresponding path program 1 times [2023-11-21 19:44:22,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:22,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111377687] [2023-11-21 19:44:22,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:22,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:22,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:22,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:22,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:22,949 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111377687] [2023-11-21 19:44:22,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111377687] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:22,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971431117] [2023-11-21 19:44:22,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:22,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:22,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:22,952 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:22,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:44:23,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:23,034 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 19:44:23,039 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:23,109 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 19:44:23,110 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-21 19:44:23,296 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:23,297 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:23,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:23,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1971431117] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:23,422 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2010088952] [2023-11-21 19:44:23,446 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:44:23,446 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:23,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:23,463 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:23,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:24,038 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:24,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '521#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_foo_~i~0#1| 32767) (<= (select |#length| ~a~0.base) (+ 3 (* |ULTIMATE.start_foo_~i~0#1| 4))) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= ~n~0 32768))' at error location [2023-11-21 19:44:24,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:24,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:24,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 10 [2023-11-21 19:44:24,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018532929] [2023-11-21 19:44:24,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:24,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 19:44:24,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:24,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 19:44:24,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2023-11-21 19:44:24,365 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:24,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:24,742 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2023-11-21 19:44:24,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:44:24,743 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-21 19:44:24,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:24,747 INFO L225 Difference]: With dead ends: 47 [2023-11-21 19:44:24,747 INFO L226 Difference]: Without dead ends: 47 [2023-11-21 19:44:24,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=321, Unknown=0, NotChecked=0, Total=420 [2023-11-21 19:44:24,750 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 46 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:24,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 93 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:44:24,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-21 19:44:24,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2023-11-21 19:44:24,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 31 states have (on average 1.6451612903225807) internal successors, (51), 46 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:24,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2023-11-21 19:44:24,766 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 6 [2023-11-21 19:44:24,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:24,766 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2023-11-21 19:44:24,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:24,766 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2023-11-21 19:44:24,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:44:24,767 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:24,767 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-11-21 19:44:24,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:24,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-21 19:44:24,986 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:24,986 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:24,986 INFO L85 PathProgramCache]: Analyzing trace with hash 1763584045, now seen corresponding path program 1 times [2023-11-21 19:44:24,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:24,987 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771054873] [2023-11-21 19:44:24,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:24,987 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:25,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:25,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:44:25,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:25,055 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771054873] [2023-11-21 19:44:25,055 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771054873] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:25,055 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:25,056 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:44:25,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507703351] [2023-11-21 19:44:25,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:25,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:44:25,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:25,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:44:25,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:44:25,058 INFO L87 Difference]: Start difference. First operand 47 states and 51 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) [2023-11-21 19:44:25,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:25,110 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2023-11-21 19:44:25,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:44:25,111 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 9 [2023-11-21 19:44:25,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:25,112 INFO L225 Difference]: With dead ends: 45 [2023-11-21 19:44:25,112 INFO L226 Difference]: Without dead ends: 45 [2023-11-21 19:44:25,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:44:25,114 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 16 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:25,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 50 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:25,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-11-21 19:44:25,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-11-21 19:44:25,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 31 states have (on average 1.5806451612903225) 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) [2023-11-21 19:44:25,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2023-11-21 19:44:25,124 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 9 [2023-11-21 19:44:25,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:25,125 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2023-11-21 19:44:25,125 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) [2023-11-21 19:44:25,125 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2023-11-21 19:44:25,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:44:25,126 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:25,126 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2023-11-21 19:44:25,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-21 19:44:25,126 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:25,127 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:25,127 INFO L85 PathProgramCache]: Analyzing trace with hash 1763584046, now seen corresponding path program 1 times [2023-11-21 19:44:25,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:25,128 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442645717] [2023-11-21 19:44:25,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:25,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:25,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:25,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:25,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1442645717] [2023-11-21 19:44:25,215 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1442645717] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:25,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834514669] [2023-11-21 19:44:25,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:25,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:25,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:25,217 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:25,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:44:25,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:25,293 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:44:25,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:25,357 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:25,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:25,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834514669] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:25,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1469183194] [2023-11-21 19:44:25,411 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-21 19:44:25,411 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:25,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:25,412 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:25,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:25,813 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:26,166 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '786#(and (<= (select |#length| ~b~0.base) (+ ~b~0.offset 3)) (= |ULTIMATE.start_foo_~i~0#1| 0) (exists ((|v_ULTIMATE.start_foo_~i~0#1_51| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 32768 |v_ULTIMATE.start_foo_~i~0#1_51|) (= ~b~0.offset 4) (= ~a~0.offset 0) (= ~n~0 32768))))' at error location [2023-11-21 19:44:26,166 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:26,166 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:26,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2023-11-21 19:44:26,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327814422] [2023-11-21 19:44:26,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:26,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:44:26,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:26,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:44:26,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:44:26,172 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2023-11-21 19:44:26,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:26,313 INFO L93 Difference]: Finished difference Result 61 states and 65 transitions. [2023-11-21 19:44:26,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:44:26,315 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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 9 [2023-11-21 19:44:26,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:26,316 INFO L225 Difference]: With dead ends: 61 [2023-11-21 19:44:26,316 INFO L226 Difference]: Without dead ends: 61 [2023-11-21 19:44:26,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=152, Invalid=268, Unknown=0, NotChecked=0, Total=420 [2023-11-21 19:44:26,317 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 80 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:26,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 112 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:44:26,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-21 19:44:26,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2023-11-21 19:44:26,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 38 states have (on average 1.5) internal successors, (57), 51 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:26,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2023-11-21 19:44:26,323 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 9 [2023-11-21 19:44:26,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:26,323 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2023-11-21 19:44:26,323 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 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) [2023-11-21 19:44:26,324 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2023-11-21 19:44:26,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-21 19:44:26,324 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:26,324 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1] [2023-11-21 19:44:26,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:26,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:26,539 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:26,539 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:26,539 INFO L85 PathProgramCache]: Analyzing trace with hash 849004695, now seen corresponding path program 2 times [2023-11-21 19:44:26,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:26,540 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686230982] [2023-11-21 19:44:26,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:26,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:26,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:27,052 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:27,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:27,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686230982] [2023-11-21 19:44:27,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686230982] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:27,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250952508] [2023-11-21 19:44:27,053 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:44:27,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:27,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:27,056 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:27,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:44:27,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-21 19:44:27,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:44:27,146 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-21 19:44:27,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:27,172 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-21 19:44:27,173 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2023-11-21 19:44:27,474 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:44:27,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:27,714 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:44:27,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250952508] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:27,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [164905841] [2023-11-21 19:44:27,717 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:44:27,717 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:27,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:27,718 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:27,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:28,009 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:28,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '993#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_foo_~i~0#1| 32767) (<= (select |#length| ~a~0.base) (+ 3 (* |ULTIMATE.start_foo_~i~0#1| 4))) (= ~b~0.offset 4) (= ~a~0.offset 0) (<= 0 |ULTIMATE.start_foo_~i~0#1|) (= ~n~0 32768))' at error location [2023-11-21 19:44:28,378 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:28,379 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:28,379 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 15 [2023-11-21 19:44:28,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612942507] [2023-11-21 19:44:28,379 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:28,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-21 19:44:28,380 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:28,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-21 19:44:28,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2023-11-21 19:44:28,381 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:28,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:28,818 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2023-11-21 19:44:28,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:44:28,819 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-21 19:44:28,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:28,819 INFO L225 Difference]: With dead ends: 51 [2023-11-21 19:44:28,819 INFO L226 Difference]: Without dead ends: 51 [2023-11-21 19:44:28,820 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2023-11-21 19:44:28,821 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:28,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 147 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:44:28,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-21 19:44:28,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-21 19:44:28,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 50 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:28,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2023-11-21 19:44:28,825 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 12 [2023-11-21 19:44:28,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:28,826 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2023-11-21 19:44:28,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.625) internal successors, (26), 16 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:28,826 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2023-11-21 19:44:28,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 19:44:28,827 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:28,827 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2023-11-21 19:44:28,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:29,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:29,045 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:29,045 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:29,045 INFO L85 PathProgramCache]: Analyzing trace with hash 409262110, now seen corresponding path program 2 times [2023-11-21 19:44:29,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:29,046 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992116035] [2023-11-21 19:44:29,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:29,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:29,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:29,273 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:29,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:29,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992116035] [2023-11-21 19:44:29,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992116035] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:29,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834414141] [2023-11-21 19:44:29,274 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:44:29,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:29,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:29,276 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:29,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:44:29,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-11-21 19:44:29,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:44:29,360 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-21 19:44:29,362 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:29,375 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 19:44:29,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:44:29,386 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 1 [2023-11-21 19:44:29,493 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-21 19:44:29,493 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:44:29,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834414141] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:29,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:44:29,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [9] total 12 [2023-11-21 19:44:29,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838271810] [2023-11-21 19:44:29,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:29,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:44:29,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:29,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:44:29,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:44:29,496 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:29,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:29,542 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2023-11-21 19:44:29,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:44:29,543 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-21 19:44:29,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:29,543 INFO L225 Difference]: With dead ends: 45 [2023-11-21 19:44:29,544 INFO L226 Difference]: Without dead ends: 45 [2023-11-21 19:44:29,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=109, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:44:29,545 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 27 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:29,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 42 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:29,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-11-21 19:44:29,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-11-21 19:44:29,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 44 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) [2023-11-21 19:44:29,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2023-11-21 19:44:29,549 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 17 [2023-11-21 19:44:29,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:29,549 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2023-11-21 19:44:29,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:29,550 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2023-11-21 19:44:29,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:44:29,550 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:29,550 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1] [2023-11-21 19:44:29,577 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:29,764 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:44:29,765 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:29,765 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:29,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1836059282, now seen corresponding path program 1 times [2023-11-21 19:44:29,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:29,766 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665214029] [2023-11-21 19:44:29,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:29,766 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:29,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:29,946 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:44:29,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:29,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665214029] [2023-11-21 19:44:29,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665214029] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:29,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843760027] [2023-11-21 19:44:29,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:29,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:29,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:29,949 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:29,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:44:30,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:30,044 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-21 19:44:30,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:30,187 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:44:30,187 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:30,346 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:44:30,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1843760027] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:30,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412269962] [2023-11-21 19:44:30,352 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-21 19:44:30,352 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:30,352 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:30,353 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:30,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:30,908 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:31,321 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1397#(and (or (< (+ ~b~0.offset (* |ULTIMATE.start_foo_~i~0#1| 4)) 0) (< (select |#length| ~b~0.base) (+ ~b~0.offset 4 (* |ULTIMATE.start_foo_~i~0#1| 4)))) (<= 0 |ULTIMATE.start_foo_~i~0#1|))' at error location [2023-11-21 19:44:31,321 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:31,321 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:31,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 24 [2023-11-21 19:44:31,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128080670] [2023-11-21 19:44:31,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:31,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:44:31,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:31,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:44:31,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=646, Unknown=0, NotChecked=0, Total=930 [2023-11-21 19:44:31,325 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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) [2023-11-21 19:44:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:31,723 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2023-11-21 19:44:31,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-21 19:44:31,724 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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) Word has length 19 [2023-11-21 19:44:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:31,726 INFO L225 Difference]: With dead ends: 92 [2023-11-21 19:44:31,727 INFO L226 Difference]: Without dead ends: 92 [2023-11-21 19:44:31,728 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=418, Invalid=988, Unknown=0, NotChecked=0, Total=1406 [2023-11-21 19:44:31,729 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 152 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:31,729 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 105 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:44:31,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-21 19:44:31,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 69. [2023-11-21 19:44:31,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.25) internal successors, (75), 68 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:31,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2023-11-21 19:44:31,745 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 19 [2023-11-21 19:44:31,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:31,745 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2023-11-21 19:44:31,745 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 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) [2023-11-21 19:44:31,746 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2023-11-21 19:44:31,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-21 19:44:31,748 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:31,748 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 2, 1, 1, 1, 1, 1] [2023-11-21 19:44:31,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:31,963 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:31,963 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:31,964 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:31,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1094978894, now seen corresponding path program 2 times [2023-11-21 19:44:31,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:31,964 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508353224] [2023-11-21 19:44:31,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:31,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:32,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:32,432 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:44:32,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:32,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508353224] [2023-11-21 19:44:32,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508353224] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:32,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868758314] [2023-11-21 19:44:32,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:44:32,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:32,433 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:32,434 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:32,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:44:32,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-21 19:44:32,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:44:32,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-21 19:44:32,520 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:32,530 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-11-21 19:44:32,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:44:32,537 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-11-21 19:44:32,765 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2023-11-21 19:44:32,765 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:44:32,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868758314] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:32,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:44:32,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [17] total 22 [2023-11-21 19:44:32,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598874531] [2023-11-21 19:44:32,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:32,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:44:32,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:32,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:44:32,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=350, Unknown=0, NotChecked=0, Total=506 [2023-11-21 19:44:32,768 INFO L87 Difference]: Start difference. First operand 69 states and 75 transitions. Second operand has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:32,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:32,830 INFO L93 Difference]: Finished difference Result 68 states and 69 transitions. [2023-11-21 19:44:32,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:44:32,830 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2023-11-21 19:44:32,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:32,831 INFO L225 Difference]: With dead ends: 68 [2023-11-21 19:44:32,831 INFO L226 Difference]: Without dead ends: 68 [2023-11-21 19:44:32,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=156, Invalid=350, Unknown=0, NotChecked=0, Total=506 [2023-11-21 19:44:32,833 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:32,833 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 70 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:44:32,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2023-11-21 19:44:32,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2023-11-21 19:44:32,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 60 states have (on average 1.15) internal successors, (69), 67 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:32,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2023-11-21 19:44:32,836 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 35 [2023-11-21 19:44:32,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:32,836 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2023-11-21 19:44:32,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:32,837 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2023-11-21 19:44:32,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-21 19:44:32,838 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:32,838 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:32,865 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:33,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:33,059 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:33,059 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:33,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1462788992, now seen corresponding path program 1 times [2023-11-21 19:44:33,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:33,060 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2019148254] [2023-11-21 19:44:33,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:33,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:33,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:33,164 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2023-11-21 19:44:33,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:33,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2019148254] [2023-11-21 19:44:33,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2019148254] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:33,165 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:33,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:44:33,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161556561] [2023-11-21 19:44:33,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:33,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:44:33,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:33,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:44:33,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:44:33,168 INFO L87 Difference]: Start difference. First operand 68 states and 69 transitions. Second operand has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 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) [2023-11-21 19:44:33,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:33,178 INFO L93 Difference]: Finished difference Result 66 states and 67 transitions. [2023-11-21 19:44:33,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:44:33,179 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 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 49 [2023-11-21 19:44:33,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:33,181 INFO L225 Difference]: With dead ends: 66 [2023-11-21 19:44:33,181 INFO L226 Difference]: Without dead ends: 66 [2023-11-21 19:44:33,182 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 [2023-11-21 19:44:33,183 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 17 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:33,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 19 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:33,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-21 19:44:33,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-21 19:44:33,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 65 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) [2023-11-21 19:44:33,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2023-11-21 19:44:33,188 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 49 [2023-11-21 19:44:33,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:33,188 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2023-11-21 19:44:33,188 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.5) internal successors, (11), 2 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) [2023-11-21 19:44:33,189 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2023-11-21 19:44:33,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-21 19:44:33,192 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:33,192 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:33,192 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-21 19:44:33,192 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:33,193 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:33,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1898181410, now seen corresponding path program 1 times [2023-11-21 19:44:33,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:33,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005040697] [2023-11-21 19:44:33,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:33,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:33,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:33,283 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2023-11-21 19:44:33,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:33,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005040697] [2023-11-21 19:44:33,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005040697] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:33,283 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:33,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:44:33,284 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045848279] [2023-11-21 19:44:33,284 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:33,284 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:44:33,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:33,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:44:33,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:44:33,285 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:33,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:33,299 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2023-11-21 19:44:33,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:44:33,300 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-11-21 19:44:33,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:33,302 INFO L225 Difference]: With dead ends: 64 [2023-11-21 19:44:33,302 INFO L226 Difference]: Without dead ends: 64 [2023-11-21 19:44:33,303 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 [2023-11-21 19:44:33,303 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 14 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:33,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 13 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:33,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-21 19:44:33,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-11-21 19:44:33,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 60 states have (on average 1.0833333333333333) internal successors, (65), 63 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) [2023-11-21 19:44:33,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2023-11-21 19:44:33,307 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 50 [2023-11-21 19:44:33,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:33,308 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2023-11-21 19:44:33,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 6.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:33,308 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2023-11-21 19:44:33,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-21 19:44:33,312 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:33,312 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:33,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-21 19:44:33,312 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:33,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:33,313 INFO L85 PathProgramCache]: Analyzing trace with hash 1195408594, now seen corresponding path program 1 times [2023-11-21 19:44:33,313 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:33,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704478665] [2023-11-21 19:44:33,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:33,314 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:33,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:33,795 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-21 19:44:33,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:33,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704478665] [2023-11-21 19:44:33,796 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704478665] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:33,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191173148] [2023-11-21 19:44:33,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:33,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:33,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:33,797 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:33,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:44:33,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:33,926 INFO L262 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 19:44:33,931 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:34,245 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-21 19:44:34,245 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:34,749 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-21 19:44:34,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191173148] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:34,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010307081] [2023-11-21 19:44:34,752 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-21 19:44:34,752 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:34,752 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:34,752 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:34,753 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:35,131 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:35,586 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2460#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_#valid_45| (Array Int Int))) (and (or (= (select |v_#valid_45| ~a~0.base) 1) (= ~a~0.base 0)) (= (select |v_#valid_45| ~b~0.base) 1) (= |#valid| (store |v_#valid_45| ~a~0.base 0)))) (<= 4 (select |#length| ~b~0.base)) (<= (+ ~a~0.base 1) |#StackHeapBarrier|) (= ~b~0.offset 4) (= ~a~0.offset 0) (not (= (select (select |#memory_int| ~b~0.base) 0) 0)) (= ~n~0 32768))' at error location [2023-11-21 19:44:35,586 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:35,586 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:35,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 48 [2023-11-21 19:44:35,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620398766] [2023-11-21 19:44:35,587 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:35,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-21 19:44:35,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:35,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-21 19:44:35,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1069, Invalid=2123, Unknown=0, NotChecked=0, Total=3192 [2023-11-21 19:44:35,591 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:36,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:36,556 INFO L93 Difference]: Finished difference Result 140 states and 155 transitions. [2023-11-21 19:44:36,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-21 19:44:36,557 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2023-11-21 19:44:36,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:36,559 INFO L225 Difference]: With dead ends: 140 [2023-11-21 19:44:36,560 INFO L226 Difference]: Without dead ends: 140 [2023-11-21 19:44:36,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2044 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1595, Invalid=3517, Unknown=0, NotChecked=0, Total=5112 [2023-11-21 19:44:36,566 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 303 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:36,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 102 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:44:36,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2023-11-21 19:44:36,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 112. [2023-11-21 19:44:36,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 108 states have (on average 1.0462962962962963) internal successors, (113), 111 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:36,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2023-11-21 19:44:36,574 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 52 [2023-11-21 19:44:36,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:36,574 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2023-11-21 19:44:36,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.061224489795918) internal successors, (101), 48 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:36,575 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2023-11-21 19:44:36,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-21 19:44:36,579 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:36,579 INFO L195 NwaCegarLoop]: trace histogram [30, 30, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:36,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:36,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:36,806 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:36,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:36,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1510835566, now seen corresponding path program 2 times [2023-11-21 19:44:36,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:36,807 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966843723] [2023-11-21 19:44:36,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:36,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:36,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:38,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2023-11-21 19:44:38,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:38,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966843723] [2023-11-21 19:44:38,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966843723] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:38,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [320574761] [2023-11-21 19:44:38,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:44:38,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:38,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:38,429 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:38,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:44:40,365 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-11-21 19:44:40,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:44:40,371 INFO L262 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 19:44:40,375 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:44:40,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2023-11-21 19:44:40,941 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:44:41,761 INFO L134 CoverageAnalysis]: Checked inductivity of 1125 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2023-11-21 19:44:41,761 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [320574761] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:44:41,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [985091848] [2023-11-21 19:44:41,764 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-21 19:44:41,765 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:44:41,765 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:44:41,765 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:44:41,766 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:44:42,408 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:44:43,680 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3410#(and (<= 4 ~b~0.offset) (exists ((|v_#valid_48| (Array Int Int))) (and (or (= ~a~0.base 0) (= (select |v_#valid_48| ~a~0.base) 1)) (= (select |v_#valid_48| ~b~0.base) 1) (= (store |v_#valid_48| ~a~0.base 0) |#valid|))) (<= (+ ~a~0.base 1) |#StackHeapBarrier|) (= ~a~0.offset 0) (not (= (select (select |#memory_int| ~b~0.base) (+ ~b~0.offset (- 4))) 0)) (exists ((|v_ULTIMATE.start_foo_~i~0#1_171| Int) (|v_#memory_int_113| (Array Int (Array Int Int)))) (and (<= 32767 |v_ULTIMATE.start_foo_~i~0#1_171|) (= (store |v_#memory_int_113| ~b~0.base (store (select |v_#memory_int_113| ~b~0.base) (+ ~b~0.offset (- 4) (* |v_ULTIMATE.start_foo_~i~0#1_171| 4)) (- 1))) |#memory_int|) (<= (+ ~b~0.offset (* |v_ULTIMATE.start_foo_~i~0#1_171| 4)) (select |#length| ~b~0.base)))))' at error location [2023-11-21 19:44:43,680 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:44:43,680 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:44:43,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 18, 18] total 66 [2023-11-21 19:44:43,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423538289] [2023-11-21 19:44:43,682 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:44:43,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2023-11-21 19:44:43,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:43,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2023-11-21 19:44:43,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1160, Invalid=4692, Unknown=0, NotChecked=0, Total=5852 [2023-11-21 19:44:43,688 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 66 states, 66 states have (on average 2.121212121212121) internal successors, (140), 66 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:45,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:45,467 INFO L93 Difference]: Finished difference Result 151 states and 152 transitions. [2023-11-21 19:44:45,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-21 19:44:45,469 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.121212121212121) internal successors, (140), 66 states have internal predecessors, (140), 0 states have call successors, (0), 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 100 [2023-11-21 19:44:45,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:45,470 INFO L225 Difference]: With dead ends: 151 [2023-11-21 19:44:45,470 INFO L226 Difference]: Without dead ends: 151 [2023-11-21 19:44:45,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 393 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2595 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=2710, Invalid=8846, Unknown=0, NotChecked=0, Total=11556 [2023-11-21 19:44:45,475 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 339 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 190 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:45,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [339 Valid, 119 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [190 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:44:45,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-11-21 19:44:45,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2023-11-21 19:44:45,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 146 states have (on average 1.0342465753424657) internal successors, (151), 149 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:45,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 151 transitions. [2023-11-21 19:44:45,480 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 151 transitions. Word has length 100 [2023-11-21 19:44:45,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:45,481 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 151 transitions. [2023-11-21 19:44:45,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.121212121212121) internal successors, (140), 66 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:44:45,481 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 151 transitions. [2023-11-21 19:44:45,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-21 19:44:45,482 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:45,482 INFO L195 NwaCegarLoop]: trace histogram [32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:45,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 19:44:45,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-21 19:44:45,697 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 18 more)] === [2023-11-21 19:44:45,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:45,697 INFO L85 PathProgramCache]: Analyzing trace with hash 902839114, now seen corresponding path program 3 times [2023-11-21 19:44:45,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:45,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137415229] [2023-11-21 19:44:45,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:45,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:45,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:47,359 INFO L134 CoverageAnalysis]: Checked inductivity of 2048 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2023-11-21 19:44:47,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:47,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137415229] [2023-11-21 19:44:47,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137415229] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:44:47,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691164746] [2023-11-21 19:44:47,360 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:44:47,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:44:47,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:47,365 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:44:47,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b99ad1c6-2ea1-420a-9e24-4380a4e5e48f/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process