./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a0a808cbaf75e35690b91e29e30a5a3e0888859a17f932e1ee324e5b23ddf983 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:45:54,203 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:45:54,324 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-12 00:45:54,332 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:45:54,333 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:45:54,369 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:45:54,370 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:45:54,371 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:45:54,371 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:45:54,372 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:45:54,373 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:45:54,373 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:45:54,374 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:45:54,374 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:45:54,375 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:45:54,375 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:45:54,376 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:45:54,377 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:45:54,377 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:45:54,378 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:45:54,378 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:45:54,379 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:45:54,380 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-12 00:45:54,380 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-12 00:45:54,381 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:45:54,381 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:45:54,382 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:45:54,382 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:45:54,383 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:45:54,383 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-12 00:45:54,383 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-12 00:45:54,384 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-12 00:45:54,384 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:45:54,389 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-12 00:45:54,390 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-12 00:45:54,390 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:45:54,390 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:45:54,391 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:45:54,391 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:45:54,391 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:54,391 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:45:54,392 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:45:54,392 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:45:54,392 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:45:54,393 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:45:54,393 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:45:54,393 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_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a0a808cbaf75e35690b91e29e30a5a3e0888859a17f932e1ee324e5b23ddf983 [2023-11-12 00:45:54,651 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:45:54,682 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:45:54,684 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:45:54,685 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:45:54,687 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:45:54,688 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i [2023-11-12 00:45:57,815 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:45:58,138 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:45:58,138 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/sv-benchmarks/c/list-simple/dll2n_prepend_unequal.i [2023-11-12 00:45:58,152 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/data/b0599bd71/cbcc233442054744bbb695fe38db7657/FLAG0c045e61d [2023-11-12 00:45:58,165 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/data/b0599bd71/cbcc233442054744bbb695fe38db7657 [2023-11-12 00:45:58,168 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:45:58,169 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:45:58,171 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:58,171 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:45:58,176 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:45:58,177 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,178 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ea3d4fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58, skipping insertion in model container [2023-11-12 00:45:58,178 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,221 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:45:58,514 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:58,529 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:45:58,607 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:45:58,645 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:45:58,645 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58 WrapperNode [2023-11-12 00:45:58,646 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:45:58,647 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:58,647 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:45:58,647 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:45:58,655 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,689 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,726 INFO L138 Inliner]: procedures = 127, calls = 41, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 131 [2023-11-12 00:45:58,726 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:45:58,727 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:45:58,727 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:45:58,728 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:45:58,736 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,737 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,756 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,756 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,765 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,783 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,787 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,798 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,801 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:45:58,802 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:45:58,802 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:45:58,802 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:45:58,803 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (1/1) ... [2023-11-12 00:45:58,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:45:58,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:45:58,846 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:45:58,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:45:58,880 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-12 00:45:58,880 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-12 00:45:58,880 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:45:58,880 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:45:58,881 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:45:58,881 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:45:58,881 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:45:58,881 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-12 00:45:58,882 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-12 00:45:58,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:45:58,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-12 00:45:58,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:45:58,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:45:58,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:45:59,018 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:45:59,020 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:45:59,058 INFO L770 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-12 00:45:59,453 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:45:59,572 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:45:59,572 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:45:59,576 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:59 BoogieIcfgContainer [2023-11-12 00:45:59,576 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:45:59,580 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:45:59,580 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:45:59,584 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:45:59,585 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:45:58" (1/3) ... [2023-11-12 00:45:59,586 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f309273 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:59, skipping insertion in model container [2023-11-12 00:45:59,586 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:45:58" (2/3) ... [2023-11-12 00:45:59,589 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f309273 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:45:59, skipping insertion in model container [2023-11-12 00:45:59,590 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:45:59" (3/3) ... [2023-11-12 00:45:59,591 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_prepend_unequal.i [2023-11-12 00:45:59,611 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:45:59,611 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 45 error locations. [2023-11-12 00:45:59,663 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:45:59,671 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;@7f29da2e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:45:59,671 INFO L358 AbstractCegarLoop]: Starting to check reachability of 45 error locations. [2023-11-12 00:45:59,676 INFO L276 IsEmpty]: Start isEmpty. Operand has 90 states, 42 states have (on average 2.3333333333333335) internal successors, (98), 88 states have internal predecessors, (98), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:45:59,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:45:59,693 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:45:59,694 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:45:59,695 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:45:59,703 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:45:59,703 INFO L85 PathProgramCache]: Analyzing trace with hash 6599894, now seen corresponding path program 1 times [2023-11-12 00:45:59,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:45:59,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177322994] [2023-11-12 00:45:59,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:45:59,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:45:59,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:00,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:00,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:00,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177322994] [2023-11-12 00:46:00,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177322994] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:00,046 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:46:00,047 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:46:00,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11033045] [2023-11-12 00:46:00,049 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:00,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:46:00,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:00,089 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:46:00,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,092 INFO L87 Difference]: Start difference. First operand has 90 states, 42 states have (on average 2.3333333333333335) internal successors, (98), 88 states have internal predecessors, (98), 2 states have call successors, (2), 1 states have call predecessors, (2), 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 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:00,219 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2023-11-12 00:46:00,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:46:00,222 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:46:00,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:00,231 INFO L225 Difference]: With dead ends: 86 [2023-11-12 00:46:00,231 INFO L226 Difference]: Without dead ends: 81 [2023-11-12 00:46:00,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,237 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 12 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:00,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 107 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:46:00,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-12 00:46:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-12 00:46:00,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 39 states have (on average 2.230769230769231) internal successors, (87), 80 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 87 transitions. [2023-11-12 00:46:00,275 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 87 transitions. Word has length 4 [2023-11-12 00:46:00,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:00,276 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 87 transitions. [2023-11-12 00:46:00,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,276 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 87 transitions. [2023-11-12 00:46:00,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:46:00,277 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:00,277 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:46:00,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:46:00,278 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:46:00,278 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:00,279 INFO L85 PathProgramCache]: Analyzing trace with hash 6599895, now seen corresponding path program 1 times [2023-11-12 00:46:00,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:00,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121955666] [2023-11-12 00:46:00,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:00,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:00,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:00,422 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:00,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:00,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121955666] [2023-11-12 00:46:00,423 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121955666] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:00,424 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:46:00,424 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:46:00,424 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183466837] [2023-11-12 00:46:00,424 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:00,425 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:46:00,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:00,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:46:00,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,428 INFO L87 Difference]: Start difference. First operand 81 states and 87 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:00,551 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2023-11-12 00:46:00,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:46:00,552 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:46:00,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:00,553 INFO L225 Difference]: With dead ends: 78 [2023-11-12 00:46:00,553 INFO L226 Difference]: Without dead ends: 78 [2023-11-12 00:46:00,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,555 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 8 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:00,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 101 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:46:00,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-12 00:46:00,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2023-11-12 00:46:00,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 39 states have (on average 2.1538461538461537) internal successors, (84), 77 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2023-11-12 00:46:00,567 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 4 [2023-11-12 00:46:00,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:00,568 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2023-11-12 00:46:00,568 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,568 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2023-11-12 00:46:00,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 00:46:00,569 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:00,569 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 00:46:00,569 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:46:00,570 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:46:00,570 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:00,571 INFO L85 PathProgramCache]: Analyzing trace with hash 6778703, now seen corresponding path program 1 times [2023-11-12 00:46:00,571 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:00,571 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174699072] [2023-11-12 00:46:00,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:00,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:00,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:00,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:00,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:00,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1174699072] [2023-11-12 00:46:00,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1174699072] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:00,677 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:46:00,678 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:46:00,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362155503] [2023-11-12 00:46:00,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:00,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:46:00,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:00,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:46:00,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,686 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:00,753 INFO L93 Difference]: Finished difference Result 88 states and 95 transitions. [2023-11-12 00:46:00,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:46:00,755 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 00:46:00,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:00,760 INFO L225 Difference]: With dead ends: 88 [2023-11-12 00:46:00,760 INFO L226 Difference]: Without dead ends: 88 [2023-11-12 00:46:00,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,762 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 10 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:00,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 138 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:46:00,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-11-12 00:46:00,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2023-11-12 00:46:00,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 40 states have (on average 2.125) internal successors, (85), 78 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 85 transitions. [2023-11-12 00:46:00,770 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 85 transitions. Word has length 4 [2023-11-12 00:46:00,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:00,771 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 85 transitions. [2023-11-12 00:46:00,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,771 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 85 transitions. [2023-11-12 00:46:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:46:00,772 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:00,772 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:46:00,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-12 00:46:00,772 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:46:00,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:00,773 INFO L85 PathProgramCache]: Analyzing trace with hash 582024538, now seen corresponding path program 1 times [2023-11-12 00:46:00,773 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:00,773 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007534001] [2023-11-12 00:46:00,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:00,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:00,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:00,862 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:00,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:00,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007534001] [2023-11-12 00:46:00,863 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007534001] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:00,863 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:46:00,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:46:00,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333089913] [2023-11-12 00:46:00,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:00,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:46:00,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:00,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:46:00,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,865 INFO L87 Difference]: Start difference. First operand 79 states and 85 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:00,920 INFO L93 Difference]: Finished difference Result 85 states and 91 transitions. [2023-11-12 00:46:00,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:46:00,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 00:46:00,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:00,924 INFO L225 Difference]: With dead ends: 85 [2023-11-12 00:46:00,924 INFO L226 Difference]: Without dead ends: 85 [2023-11-12 00:46:00,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:46:00,935 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 1 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:00,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 133 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:46:00,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2023-11-12 00:46:00,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2023-11-12 00:46:00,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 45 states have (on average 2.0) internal successors, (90), 83 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2023-11-12 00:46:00,943 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 8 [2023-11-12 00:46:00,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:00,943 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2023-11-12 00:46:00,944 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:00,944 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2023-11-12 00:46:00,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:46:00,944 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:00,945 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:46:00,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-12 00:46:00,948 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:46:00,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:00,948 INFO L85 PathProgramCache]: Analyzing trace with hash 314999058, now seen corresponding path program 1 times [2023-11-12 00:46:00,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:00,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237302663] [2023-11-12 00:46:00,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:00,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:01,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:01,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:01,167 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:01,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237302663] [2023-11-12 00:46:01,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237302663] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:46:01,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99386297] [2023-11-12 00:46:01,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:01,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:46:01,168 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:46:01,172 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:46:01,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:46:01,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:01,299 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:46:01,304 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:46:01,363 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:01,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:46:01,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:01,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99386297] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:46:01,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1896410918] [2023-11-12 00:46:01,421 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:46:01,421 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:46:01,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:46:01,432 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:46:01,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:46:03,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:46:15,348 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1896410918] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:15,348 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:46:15,348 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-11-12 00:46:15,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972045528] [2023-11-12 00:46:15,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:15,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-12 00:46:15,350 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:15,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-12 00:46:15,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=67, Unknown=8, NotChecked=0, Total=110 [2023-11-12 00:46:15,351 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:17,838 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:19,993 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:22,006 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:26,995 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:30,175 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:32,183 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:34,744 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-12 00:46:38,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:46:38,296 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2023-11-12 00:46:38,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:46:38,297 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:46:38,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:46:38,298 INFO L225 Difference]: With dead ends: 95 [2023-11-12 00:46:38,298 INFO L226 Difference]: Without dead ends: 95 [2023-11-12 00:46:38,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=44, Invalid=78, Unknown=10, NotChecked=0, Total=132 [2023-11-12 00:46:38,300 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 6 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 282 mSolverCounterSat, 4 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 282 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:46:38,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 146 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 282 Invalid, 13 Unknown, 0 Unchecked, 19.9s Time] [2023-11-12 00:46:38,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-12 00:46:38,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2023-11-12 00:46:38,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 52 states have (on average 1.8846153846153846) internal successors, (98), 90 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:38,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2023-11-12 00:46:38,309 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 11 [2023-11-12 00:46:38,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:46:38,310 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2023-11-12 00:46:38,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:38,310 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2023-11-12 00:46:38,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:46:38,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:46:38,311 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-12 00:46:38,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:46:38,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:46:38,518 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 42 more)] === [2023-11-12 00:46:38,518 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:46:38,518 INFO L85 PathProgramCache]: Analyzing trace with hash -405047907, now seen corresponding path program 1 times [2023-11-12 00:46:38,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:46:38,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755082562] [2023-11-12 00:46:38,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:38,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:46:38,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:38,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:38,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:46:38,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755082562] [2023-11-12 00:46:38,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755082562] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:46:38,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500961618] [2023-11-12 00:46:38,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:46:38,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:46:38,770 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:46:38,786 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:46:38,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_37b31507-dea1-4ebd-9aaa-8a1892ca569c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:46:38,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:46:38,909 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-12 00:46:38,914 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:46:38,948 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-12 00:46:39,043 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-12 00:46:39,044 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-12 00:46:39,074 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:39,074 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:46:39,290 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:46:39,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500961618] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:46:39,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119460448] [2023-11-12 00:46:39,294 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-12 00:46:39,294 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:46:39,295 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:46:39,295 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:46:39,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:46:40,688 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:46:57,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1119460448] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:46:57,228 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:46:57,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 3, 4] total 13 [2023-11-12 00:46:57,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600565520] [2023-11-12 00:46:57,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:46:57,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:46:57,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:46:57,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:46:57,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=126, Unknown=9, NotChecked=0, Total=182 [2023-11-12 00:46:57,231 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:46:59,910 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0]