./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrncmp-alloca-1.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrncmp-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash b49f3330156f5f80616a8ed1e7cf6e923644f57628dbe3e9e5b48b44602ac1db --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:18:59,117 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:18:59,186 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-11-23 21:18:59,191 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:18:59,192 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:18:59,219 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:18:59,220 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:18:59,221 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:18:59,222 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:18:59,222 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:18:59,223 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:18:59,224 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:18:59,224 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:18:59,225 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:18:59,225 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:18:59,226 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:18:59,226 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:18:59,227 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:18:59,227 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:18:59,228 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:18:59,229 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:18:59,229 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:18:59,230 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:18:59,230 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:18:59,231 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:18:59,231 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:18:59,232 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:18:59,232 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:18:59,233 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:18:59,233 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:18:59,234 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:18:59,234 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:18:59,234 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:18:59,235 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:18:59,235 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:18:59,235 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:18:59,235 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:18:59,236 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:18:59,236 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:18:59,236 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:18:59,237 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:18:59,237 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:18:59,237 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:18:59,238 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:18:59,238 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:18:59,238 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_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b49f3330156f5f80616a8ed1e7cf6e923644f57628dbe3e9e5b48b44602ac1db [2023-11-23 21:18:59,534 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:18:59,566 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:18:59,568 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:18:59,570 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:18:59,571 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:18:59,573 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/termination-memory-alloca/openbsd_cstrncmp-alloca-1.i [2023-11-23 21:19:02,973 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:19:03,371 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:19:03,372 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/sv-benchmarks/c/termination-memory-alloca/openbsd_cstrncmp-alloca-1.i [2023-11-23 21:19:03,387 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/data/d6ff21bc1/697f9340f113460eb721306d0be43df0/FLAG06346f77d [2023-11-23 21:19:03,606 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/data/d6ff21bc1/697f9340f113460eb721306d0be43df0 [2023-11-23 21:19:03,609 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:19:03,611 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:19:03,612 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:03,612 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:19:03,618 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:19:03,618 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:03" (1/1) ... [2023-11-23 21:19:03,620 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4c95fda2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:03, skipping insertion in model container [2023-11-23 21:19:03,620 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:03" (1/1) ... [2023-11-23 21:19:03,663 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:19:04,090 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:04,106 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:19:04,157 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:04,188 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:19:04,188 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04 WrapperNode [2023-11-23 21:19:04,189 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:04,190 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:04,190 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:19:04,191 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:19:04,199 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,227 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,270 INFO L138 Inliner]: procedures = 111, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2023-11-23 21:19:04,271 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:04,274 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:19:04,275 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:19:04,275 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:19:04,286 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,287 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,292 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,292 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,300 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,305 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,307 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,309 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,312 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:19:04,314 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:19:04,314 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:19:04,314 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:19:04,315 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (1/1) ... [2023-11-23 21:19:04,337 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:04,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:04,368 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:19:04,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:19:04,427 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:19:04,427 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:19:04,427 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:19:04,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:19:04,427 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:19:04,428 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:19:04,643 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:19:04,648 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:19:04,967 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:19:05,037 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:19:05,037 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 21:19:05,040 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:05 BoogieIcfgContainer [2023-11-23 21:19:05,040 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:19:05,044 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:19:05,044 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:19:05,049 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:19:05,049 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:19:03" (1/3) ... [2023-11-23 21:19:05,051 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72cc532 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:05, skipping insertion in model container [2023-11-23 21:19:05,051 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:04" (2/3) ... [2023-11-23 21:19:05,052 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@72cc532 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:05, skipping insertion in model container [2023-11-23 21:19:05,052 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:05" (3/3) ... [2023-11-23 21:19:05,054 INFO L112 eAbstractionObserver]: Analyzing ICFG openbsd_cstrncmp-alloca-1.i [2023-11-23 21:19:05,080 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:19:05,081 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 15 error locations. [2023-11-23 21:19:05,207 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:19:05,217 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;@22061d90, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:19:05,218 INFO L358 AbstractCegarLoop]: Starting to check reachability of 15 error locations. [2023-11-23 21:19:05,249 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:05,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-23 21:19:05,257 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:05,261 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-23 21:19:05,262 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:05,276 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:05,276 INFO L85 PathProgramCache]: Analyzing trace with hash 3675, now seen corresponding path program 1 times [2023-11-23 21:19:05,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:05,290 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714043692] [2023-11-23 21:19:05,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:05,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:05,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:05,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:05,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714043692] [2023-11-23 21:19:05,729 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714043692] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:05,730 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:05,730 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:19:05,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790434372] [2023-11-23 21:19:05,735 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:05,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:05,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:05,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:05,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:05,793 INFO L87 Difference]: Start difference. First operand has 31 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:05,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:05,865 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2023-11-23 21:19:05,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:05,868 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-23 21:19:05,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:05,879 INFO L225 Difference]: With dead ends: 30 [2023-11-23 21:19:05,879 INFO L226 Difference]: Without dead ends: 29 [2023-11-23 21:19:05,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:05,887 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 29 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:05,889 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 15 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:05,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-23 21:19:05,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-23 21:19:05,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 28 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:05,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2023-11-23 21:19:05,934 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 2 [2023-11-23 21:19:05,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:05,935 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2023-11-23 21:19:05,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:05,935 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2023-11-23 21:19:05,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2023-11-23 21:19:05,936 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:05,936 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2023-11-23 21:19:05,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:19:05,937 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:05,938 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:05,938 INFO L85 PathProgramCache]: Analyzing trace with hash 3676, now seen corresponding path program 1 times [2023-11-23 21:19:05,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:05,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297452396] [2023-11-23 21:19:05,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:05,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:06,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:06,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:06,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297452396] [2023-11-23 21:19:06,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297452396] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:06,325 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:06,325 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:19:06,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110526345] [2023-11-23 21:19:06,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:06,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:06,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:06,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:06,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:06,329 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:06,386 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2023-11-23 21:19:06,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:06,387 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 2 [2023-11-23 21:19:06,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:06,389 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:19:06,389 INFO L226 Difference]: Without dead ends: 28 [2023-11-23 21:19:06,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:06,397 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 30 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 16 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 [2023-11-23 21:19:06,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 16 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:06,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-23 21:19:06,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-11-23 21:19:06,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 15 states have (on average 2.066666666666667) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-11-23 21:19:06,412 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 2 [2023-11-23 21:19:06,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:06,412 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-11-23 21:19:06,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,413 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-11-23 21:19:06,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:19:06,413 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:06,413 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:19:06,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:19:06,414 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:06,425 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:06,425 INFO L85 PathProgramCache]: Analyzing trace with hash 113914, now seen corresponding path program 1 times [2023-11-23 21:19:06,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:06,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125448656] [2023-11-23 21:19:06,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:06,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:06,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:06,709 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:06,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:06,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125448656] [2023-11-23 21:19:06,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1125448656] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:06,710 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:06,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:06,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067176061] [2023-11-23 21:19:06,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:06,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:06,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:06,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:06,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:06,712 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:06,763 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2023-11-23 21:19:06,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:06,763 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-23 21:19:06,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:06,764 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:19:06,764 INFO L226 Difference]: Without dead ends: 27 [2023-11-23 21:19:06,765 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:06,767 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 53 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:06,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 14 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:06,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-23 21:19:06,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-23 21:19:06,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 15 states have (on average 2.0) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2023-11-23 21:19:06,773 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 3 [2023-11-23 21:19:06,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:06,774 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2023-11-23 21:19:06,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:06,775 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2023-11-23 21:19:06,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-23 21:19:06,775 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:06,775 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-23 21:19:06,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:19:06,776 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:06,777 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:06,777 INFO L85 PathProgramCache]: Analyzing trace with hash 113915, now seen corresponding path program 1 times [2023-11-23 21:19:06,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:06,778 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032225907] [2023-11-23 21:19:06,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:06,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:06,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:07,049 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:07,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:07,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032225907] [2023-11-23 21:19:07,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032225907] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:07,050 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:07,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-23 21:19:07,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746958255] [2023-11-23 21:19:07,050 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:07,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:07,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:07,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:07,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:07,053 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:07,091 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2023-11-23 21:19:07,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:07,091 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-23 21:19:07,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:07,092 INFO L225 Difference]: With dead ends: 26 [2023-11-23 21:19:07,092 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:19:07,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:07,094 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:07,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 15 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:07,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:19:07,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:19:07,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-11-23 21:19:07,100 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 3 [2023-11-23 21:19:07,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:07,101 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-11-23 21:19:07,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,101 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-11-23 21:19:07,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:19:07,102 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:07,102 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:19:07,102 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:19:07,103 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:07,103 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:07,103 INFO L85 PathProgramCache]: Analyzing trace with hash 109526039, now seen corresponding path program 1 times [2023-11-23 21:19:07,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:07,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613112420] [2023-11-23 21:19:07,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:07,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:07,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:07,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:07,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:07,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613112420] [2023-11-23 21:19:07,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613112420] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:07,198 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:07,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:19:07,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463968013] [2023-11-23 21:19:07,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:07,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:07,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:07,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:07,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:07,204 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:07,268 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2023-11-23 21:19:07,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:07,269 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-23 21:19:07,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:07,271 INFO L225 Difference]: With dead ends: 24 [2023-11-23 21:19:07,271 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:19:07,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:07,275 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 43 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:07,276 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 11 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:07,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:19:07,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:19:07,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.8) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-11-23 21:19:07,295 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 5 [2023-11-23 21:19:07,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:07,295 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-11-23 21:19:07,295 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,295 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-11-23 21:19:07,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:19:07,296 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:07,296 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:19:07,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:19:07,297 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:07,297 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:07,298 INFO L85 PathProgramCache]: Analyzing trace with hash 109526040, now seen corresponding path program 1 times [2023-11-23 21:19:07,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:07,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918962872] [2023-11-23 21:19:07,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:07,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:07,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:07,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:07,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:07,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918962872] [2023-11-23 21:19:07,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918962872] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:07,470 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:07,470 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:19:07,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008085533] [2023-11-23 21:19:07,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:07,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:19:07,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:07,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:19:07,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:07,474 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:07,551 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2023-11-23 21:19:07,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:07,551 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-23 21:19:07,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:07,556 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:19:07,556 INFO L226 Difference]: Without dead ends: 34 [2023-11-23 21:19:07,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:19:07,559 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 82 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:07,561 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 21 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:07,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-23 21:19:07,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2023-11-23 21:19:07,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 27 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2023-11-23 21:19:07,573 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 5 [2023-11-23 21:19:07,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:07,573 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2023-11-23 21:19:07,573 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,574 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2023-11-23 21:19:07,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:19:07,574 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:07,574 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:19:07,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:19:07,575 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:07,577 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:07,577 INFO L85 PathProgramCache]: Analyzing trace with hash -899660727, now seen corresponding path program 1 times [2023-11-23 21:19:07,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:07,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121261338] [2023-11-23 21:19:07,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:07,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:07,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:07,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:07,745 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121261338] [2023-11-23 21:19:07,745 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121261338] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:07,746 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:07,746 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:07,746 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839840191] [2023-11-23 21:19:07,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:07,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:07,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:07,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:07,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:07,748 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:07,798 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2023-11-23 21:19:07,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:07,799 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:19:07,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:07,802 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:19:07,802 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:19:07,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:07,805 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 21 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:07,806 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 26 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:07,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:19:07,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:19:07,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.6875) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2023-11-23 21:19:07,811 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 6 [2023-11-23 21:19:07,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:07,812 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2023-11-23 21:19:07,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,812 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2023-11-23 21:19:07,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:19:07,813 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:07,813 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:19:07,813 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 21:19:07,813 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:07,814 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:07,814 INFO L85 PathProgramCache]: Analyzing trace with hash -899658563, now seen corresponding path program 1 times [2023-11-23 21:19:07,814 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:07,814 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337688360] [2023-11-23 21:19:07,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:07,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:07,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:07,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:07,863 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:07,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337688360] [2023-11-23 21:19:07,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337688360] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:07,863 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:07,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:19:07,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550617524] [2023-11-23 21:19:07,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:07,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:07,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:07,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:07,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:07,865 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:07,896 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2023-11-23 21:19:07,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:07,896 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:19:07,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:07,897 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:19:07,897 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:19:07,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:07,898 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:07,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 15 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:07,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:19:07,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:19:07,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.5625) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-11-23 21:19:07,901 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 6 [2023-11-23 21:19:07,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:07,902 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-11-23 21:19:07,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:07,902 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-11-23 21:19:07,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:19:07,903 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:07,903 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:19:07,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 21:19:07,903 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:07,904 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:07,904 INFO L85 PathProgramCache]: Analyzing trace with hash -899658562, now seen corresponding path program 1 times [2023-11-23 21:19:07,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:07,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317757894] [2023-11-23 21:19:07,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:07,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:07,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:08,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:08,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:08,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317757894] [2023-11-23 21:19:08,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317757894] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:08,070 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:08,070 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:19:08,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736859996] [2023-11-23 21:19:08,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:08,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:19:08,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:08,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:19:08,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:08,073 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:08,137 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2023-11-23 21:19:08,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:19:08,138 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:19:08,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:08,140 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:19:08,140 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:19:08,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:19:08,143 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 22 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:08,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 22 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:08,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:19:08,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:19:08,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.5) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-23 21:19:08,150 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 6 [2023-11-23 21:19:08,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:08,150 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-23 21:19:08,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,151 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-23 21:19:08,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:19:08,151 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:08,152 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:08,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 21:19:08,152 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:08,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:08,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1283451906, now seen corresponding path program 1 times [2023-11-23 21:19:08,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:08,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [729598266] [2023-11-23 21:19:08,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:08,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:08,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:08,217 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:08,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [729598266] [2023-11-23 21:19:08,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [729598266] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:08,218 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:08,218 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:19:08,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406609921] [2023-11-23 21:19:08,219 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:08,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:19:08,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:08,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:19:08,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:08,220 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:08,267 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2023-11-23 21:19:08,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:19:08,269 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:19:08,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:08,271 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:19:08,272 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 21:19:08,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:19:08,273 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 29 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:08,274 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 10 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:08,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 21:19:08,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-23 21:19:08,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.4375) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-11-23 21:19:08,288 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 8 [2023-11-23 21:19:08,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:08,289 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-11-23 21:19:08,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,289 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-11-23 21:19:08,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:19:08,290 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:08,290 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:08,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-23 21:19:08,290 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:08,291 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:08,291 INFO L85 PathProgramCache]: Analyzing trace with hash -1283451905, now seen corresponding path program 1 times [2023-11-23 21:19:08,291 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:08,292 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [395850213] [2023-11-23 21:19:08,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:08,292 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:08,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:08,449 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:08,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:08,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [395850213] [2023-11-23 21:19:08,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [395850213] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:08,449 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:08,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:19:08,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892326411] [2023-11-23 21:19:08,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:08,450 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:19:08,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:08,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:19:08,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:19:08,451 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:08,544 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2023-11-23 21:19:08,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:19:08,545 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:19:08,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:08,546 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:19:08,546 INFO L226 Difference]: Without dead ends: 27 [2023-11-23 21:19:08,546 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:19:08,547 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 55 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:08,547 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 11 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:08,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-23 21:19:08,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2023-11-23 21:19:08,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.411764705882353) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-23 21:19:08,550 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 8 [2023-11-23 21:19:08,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:08,551 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-23 21:19:08,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,551 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-23 21:19:08,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:19:08,552 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:08,552 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:08,552 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-23 21:19:08,552 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:08,553 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:08,553 INFO L85 PathProgramCache]: Analyzing trace with hash -1132312087, now seen corresponding path program 1 times [2023-11-23 21:19:08,553 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:08,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177945601] [2023-11-23 21:19:08,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:08,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:08,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:08,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:08,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:08,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177945601] [2023-11-23 21:19:08,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177945601] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:08,619 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:08,619 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:19:08,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214073614] [2023-11-23 21:19:08,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:08,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:19:08,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:08,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:19:08,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:19:08,621 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:08,647 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2023-11-23 21:19:08,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:19:08,648 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:19:08,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:08,649 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:19:08,649 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 21:19:08,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:08,650 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:08,650 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 17 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:08,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 21:19:08,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-23 21:19:08,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 21 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2023-11-23 21:19:08,653 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 9 [2023-11-23 21:19:08,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:08,653 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2023-11-23 21:19:08,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:08,654 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2023-11-23 21:19:08,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:19:08,654 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:08,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:08,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-23 21:19:08,655 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:08,655 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:08,656 INFO L85 PathProgramCache]: Analyzing trace with hash -1132312086, now seen corresponding path program 1 times [2023-11-23 21:19:08,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:08,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037700686] [2023-11-23 21:19:08,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:08,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:08,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:08,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:08,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:08,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037700686] [2023-11-23 21:19:08,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037700686] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:08,927 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:08,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:19:08,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549723593] [2023-11-23 21:19:08,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:08,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:19:08,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:08,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:19:08,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:19:08,931 INFO L87 Difference]: Start difference. First operand 22 states and 23 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) [2023-11-23 21:19:09,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:09,120 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2023-11-23 21:19:09,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:19:09,121 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.5) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:19:09,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:09,121 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:19:09,122 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:19:09,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:19:09,123 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 31 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:09,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 17 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:09,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:19:09,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 21. [2023-11-23 21:19:09,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.3125) internal successors, (21), 20 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:09,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2023-11-23 21:19:09,127 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 9 [2023-11-23 21:19:09,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:09,127 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2023-11-23 21:19:09,127 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) [2023-11-23 21:19:09,128 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2023-11-23 21:19:09,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:19:09,129 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:09,129 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:09,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-23 21:19:09,130 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:09,130 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:09,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1516816400, now seen corresponding path program 1 times [2023-11-23 21:19:09,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:09,131 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560441436] [2023-11-23 21:19:09,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:09,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:09,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:09,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:09,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:09,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560441436] [2023-11-23 21:19:09,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560441436] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:09,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [823611188] [2023-11-23 21:19:09,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:09,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:09,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:09,602 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:09,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:19:09,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:09,742 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-23 21:19:09,748 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:09,827 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-11-23 21:19:09,898 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-23 21:19:10,014 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 14 [2023-11-23 21:19:10,277 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:10,278 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 17 [2023-11-23 21:19:10,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:10,368 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:10,756 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:10,756 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-11-23 21:19:10,772 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:10,773 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 34 [2023-11-23 21:19:10,785 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:19:10,796 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:19:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:10,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [823611188] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:10,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291930650] [2023-11-23 21:19:10,899 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:10,899 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:10,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:10,910 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:10,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:16,374 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:18,515 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '862#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.base|) (= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (<= (select |#length| |ULTIMATE.start_cstrncmp_~s1#1.base|) |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 2 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet15#1| 2147483647))' at error location [2023-11-23 21:19:18,515 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:18,515 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:18,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 17 [2023-11-23 21:19:18,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923241311] [2023-11-23 21:19:18,516 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:18,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-23 21:19:18,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:18,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-23 21:19:18,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=706, Unknown=2, NotChecked=0, Total=812 [2023-11-23 21:19:18,518 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:19,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:19,083 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2023-11-23 21:19:19,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:19:19,084 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:19:19,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:19,085 INFO L225 Difference]: With dead ends: 29 [2023-11-23 21:19:19,085 INFO L226 Difference]: Without dead ends: 29 [2023-11-23 21:19:19,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=202, Invalid=1056, Unknown=2, NotChecked=0, Total=1260 [2023-11-23 21:19:19,086 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 114 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:19,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 19 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:19,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-23 21:19:19,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2023-11-23 21:19:19,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 22 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:19,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2023-11-23 21:19:19,089 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 11 [2023-11-23 21:19:19,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:19,089 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2023-11-23 21:19:19,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 18 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:19,090 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2023-11-23 21:19:19,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:19:19,090 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:19,090 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:19,112 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:19:19,303 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 21:19:19,304 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:19,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:19,304 INFO L85 PathProgramCache]: Analyzing trace with hash 223333350, now seen corresponding path program 1 times [2023-11-23 21:19:19,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:19,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536226053] [2023-11-23 21:19:19,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:19,306 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:19,828 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:19,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:19,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536226053] [2023-11-23 21:19:19,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536226053] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:19,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383170132] [2023-11-23 21:19:19,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:19,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:19,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:19,831 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:19,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:19:19,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:19,927 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 56 conjunts are in the unsatisfiable core [2023-11-23 21:19:19,930 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:19,986 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2023-11-23 21:19:20,379 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:19:20,396 INFO L349 Elim1Store]: treesize reduction 23, result has 30.3 percent of original size [2023-11-23 21:19:20,397 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 20 [2023-11-23 21:19:20,531 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:20,531 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:20,946 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:20,947 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 95 [2023-11-23 21:19:20,971 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:19:21,008 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 26 [2023-11-23 21:19:21,027 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:21,027 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 45 [2023-11-23 21:19:21,077 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:21,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383170132] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:21,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [196297445] [2023-11-23 21:19:21,081 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:21,082 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:21,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:21,082 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:21,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:25,110 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:27,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1030#(and (<= 2 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 2 |ULTIMATE.start_cstrncmp_#t~post3#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 (+ 2147483648 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 2 |ULTIMATE.start_cstrncmp_~s2#1.base|) (= 0 |ULTIMATE.start_cstrncmp_#in~s1#1.offset|) (<= 1 |ULTIMATE.start_cstrncmp_~s2#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrncmp_~n#1| 2147483647) (= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= 0 |ULTIMATE.start_cstrncmp_#in~s2#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= 2 |ULTIMATE.start_cstrncmp_#in~s1#1.base|) (<= 2 |ULTIMATE.start_cstrncmp_#in~s2#1.base|) (<= 2 |ULTIMATE.start_main_#t~malloc14#1.base|) (<= |ULTIMATE.start_cstrncmp_#in~n#1| 2147483647) (<= (select |#length| |ULTIMATE.start_cstrncmp_#t~post3#1.base|) |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 2 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 (+ |ULTIMATE.start_cstrncmp_#in~n#1| 2147483648)) (<= 2 |ULTIMATE.start_cstrncmp_~s1#1.base|) (<= 2 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 0 |ULTIMATE.start_cstrncmp_#t~post3#1.offset|) (<= 0 |ULTIMATE.start_cstrncmp_~s1#1.offset|) (= |ULTIMATE.start_main_#t~malloc14#1.offset| 0) (<= |ULTIMATE.start_main_#t~nondet15#1| 2147483647))' at error location [2023-11-23 21:19:27,322 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:27,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:27,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 24 [2023-11-23 21:19:27,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223415310] [2023-11-23 21:19:27,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:27,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-23 21:19:27,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:27,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-23 21:19:27,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1105, Unknown=1, NotChecked=0, Total=1260 [2023-11-23 21:19:27,325 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:28,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:28,085 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2023-11-23 21:19:28,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:19:28,092 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 21:19:28,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:28,092 INFO L225 Difference]: With dead ends: 25 [2023-11-23 21:19:28,092 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:19:28,094 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 421 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=259, Invalid=1720, Unknown=1, NotChecked=0, Total=1980 [2023-11-23 21:19:28,094 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 55 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:28,095 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 38 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:19:28,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:19:28,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2023-11-23 21:19:28,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.2) internal successors, (24), 23 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:28,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2023-11-23 21:19:28,097 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 12 [2023-11-23 21:19:28,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:28,097 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2023-11-23 21:19:28,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:28,097 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2023-11-23 21:19:28,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:19:28,098 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:28,098 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:28,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:28,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-23 21:19:28,317 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:28,317 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:28,317 INFO L85 PathProgramCache]: Analyzing trace with hash -125015769, now seen corresponding path program 1 times [2023-11-23 21:19:28,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:28,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144430552] [2023-11-23 21:19:28,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:28,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:28,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:28,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:28,446 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:28,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144430552] [2023-11-23 21:19:28,446 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144430552] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:28,446 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [428323500] [2023-11-23 21:19:28,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:28,447 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:28,447 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:28,448 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:28,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:19:28,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:28,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-23 21:19:28,560 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:28,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:28,591 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:28,636 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2023-11-23 21:19:28,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:28,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [428323500] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:28,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [51412800] [2023-11-23 21:19:28,677 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:28,677 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:28,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:28,678 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:28,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:32,618 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:38,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [51412800] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:38,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:38,115 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 5, 5] total 21 [2023-11-23 21:19:38,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964024152] [2023-11-23 21:19:38,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:38,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:19:38,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:38,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:19:38,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=366, Unknown=2, NotChecked=0, Total=462 [2023-11-23 21:19:38,117 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 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) [2023-11-23 21:19:42,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:42,566 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2023-11-23 21:19:42,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 21:19:42,566 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 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 14 [2023-11-23 21:19:42,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:42,567 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:19:42,567 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:19:42,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=180, Invalid=687, Unknown=3, NotChecked=0, Total=870 [2023-11-23 21:19:42,568 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 29 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:42,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 0 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 92 Invalid, 1 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 21:19:42,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:19:42,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:19:42,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:42,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2023-11-23 21:19:42,571 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 14 [2023-11-23 21:19:42,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:42,571 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2023-11-23 21:19:42,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.1) internal successors, (11), 10 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) [2023-11-23 21:19:42,572 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2023-11-23 21:19:42,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 21:19:42,572 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:42,573 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:42,589 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:42,785 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-23 21:19:42,785 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:42,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:42,785 INFO L85 PathProgramCache]: Analyzing trace with hash 419469762, now seen corresponding path program 1 times [2023-11-23 21:19:42,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:42,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631247582] [2023-11-23 21:19:42,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:42,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:42,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:43,064 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:43,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:43,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631247582] [2023-11-23 21:19:43,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631247582] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:43,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258427107] [2023-11-23 21:19:43,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:43,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:43,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:43,067 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:43,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:19:43,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:43,159 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 21:19:43,161 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:43,214 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:43,214 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:19:43,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258427107] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:43,214 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:19:43,215 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 10 [2023-11-23 21:19:43,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571513620] [2023-11-23 21:19:43,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:43,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:19:43,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:43,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:19:43,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:19:43,216 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 7 states, 6 states have (on average 2.5) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:43,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:43,293 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2023-11-23 21:19:43,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:19:43,301 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-23 21:19:43,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:43,302 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:19:43,302 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:19:43,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:19:43,304 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:43,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 24 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:43,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:19:43,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:19:43,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:43,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2023-11-23 21:19:43,307 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2023-11-23 21:19:43,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:43,307 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2023-11-23 21:19:43,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:43,307 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2023-11-23 21:19:43,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:19:43,308 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:43,308 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 21:19:43,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:43,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-23 21:19:43,534 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 12 more)] === [2023-11-23 21:19:43,534 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:43,534 INFO L85 PathProgramCache]: Analyzing trace with hash -608112184, now seen corresponding path program 2 times [2023-11-23 21:19:43,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:43,534 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975700794] [2023-11-23 21:19:43,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:43,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:43,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:44,183 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:44,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:44,184 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975700794] [2023-11-23 21:19:44,184 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975700794] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:44,184 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215166251] [2023-11-23 21:19:44,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:19:44,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:44,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:44,186 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:44,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f374570d-49b6-4ac8-93c3-adb800f5389f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:19:44,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:19:44,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:44,288 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 21:19:44,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:44,299 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2023-11-23 21:19:44,330 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:19:44,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-23 21:19:44,725 INFO L349 Elim1Store]: treesize reduction 4, result has 84.0 percent of original size [2023-11-23 21:19:44,725 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 31 [2023-11-23 21:19:44,823 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:44,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:45,490 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:45,490 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 34 [2023-11-23 21:19:45,515 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:45,515 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 58 treesize of output 69 [2023-11-23 21:19:45,529 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-23 21:19:45,546 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:19:45,546 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 25 [2023-11-23 21:19:45,657 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:45,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215166251] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:45,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [782469655] [2023-11-23 21:19:45,659 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:45,659 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:45,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:45,661 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:45,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:49,210 INFO L180 IcfgInterpreter]: Interpretation finished