./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff 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_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ --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 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:19:38,401 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:19:38,505 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 05:19:38,512 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:19:38,513 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:19:38,548 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:19:38,549 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:19:38,550 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:19:38,551 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:19:38,551 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:19:38,552 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:19:38,553 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:19:38,553 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:19:38,554 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:19:38,555 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:19:38,555 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:19:38,556 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:19:38,556 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:19:38,557 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:19:38,558 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:19:38,558 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:19:38,560 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:19:38,561 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 05:19:38,561 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 05:19:38,562 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:19:38,562 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:19:38,563 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:19:38,567 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:19:38,568 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:19:38,568 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 05:19:38,569 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 05:19:38,569 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 05:19:38,570 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:19:38,570 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 05:19:38,570 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 05:19:38,571 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:19:38,571 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:19:38,572 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:19:38,572 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:19:38,573 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:38,573 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:19:38,575 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:19:38,575 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:19:38,575 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:19:38,576 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:19:38,576 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:19:38,576 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_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8f9453cad2383b5119b308e041fed5f4a740e7abd43cb8ad7833872af20a8d57 [2023-11-19 05:19:38,997 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:19:39,032 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:19:39,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:19:39,039 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:19:39,041 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:19:39,042 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-19 05:19:42,684 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:19:43,038 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:19:43,039 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/sv-benchmarks/c/heap-manipulation/sll_to_dll_rev-2.i [2023-11-19 05:19:43,061 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/data/cddee03fa/a69890d3f813480baa7b7748a91fb4cf/FLAGca9cd00c4 [2023-11-19 05:19:43,080 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/data/cddee03fa/a69890d3f813480baa7b7748a91fb4cf [2023-11-19 05:19:43,088 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:19:43,090 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:19:43,091 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:43,091 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:19:43,106 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:19:43,107 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:43,109 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f373c77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43, skipping insertion in model container [2023-11-19 05:19:43,109 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:43,166 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:19:43,736 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:43,754 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:19:43,862 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:43,912 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:19:43,912 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43 WrapperNode [2023-11-19 05:19:43,913 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:43,914 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:43,915 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:19:43,915 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:19:43,949 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,010 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,069 INFO L138 Inliner]: procedures = 129, calls = 80, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 215 [2023-11-19 05:19:44,070 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:44,071 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:19:44,071 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:19:44,071 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:19:44,089 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,089 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,132 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,132 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,163 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,172 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,175 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,193 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,198 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:19:44,199 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:19:44,200 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:19:44,200 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:19:44,201 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (1/1) ... [2023-11-19 05:19:44,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:44,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:44,250 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:19:44,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:19:44,289 INFO L130 BoogieDeclarations]: Found specification of procedure fail [2023-11-19 05:19:44,290 INFO L138 BoogieDeclarations]: Found implementation of procedure fail [2023-11-19 05:19:44,290 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:19:44,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:19:44,291 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:19:44,291 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:19:44,291 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:19:44,292 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_prev [2023-11-19 05:19:44,294 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_prev [2023-11-19 05:19:44,295 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:19:44,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:19:44,296 INFO L130 BoogieDeclarations]: Found specification of procedure chain_node [2023-11-19 05:19:44,296 INFO L138 BoogieDeclarations]: Found implementation of procedure chain_node [2023-11-19 05:19:44,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:19:44,297 INFO L130 BoogieDeclarations]: Found specification of procedure check_seq_next [2023-11-19 05:19:44,297 INFO L138 BoogieDeclarations]: Found implementation of procedure check_seq_next [2023-11-19 05:19:44,297 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:19:44,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:19:44,502 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:19:44,505 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:19:45,380 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:19:45,504 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:19:45,505 INFO L302 CfgBuilder]: Removed 33 assume(true) statements. [2023-11-19 05:19:45,512 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:45 BoogieIcfgContainer [2023-11-19 05:19:45,513 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:19:45,516 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:19:45,516 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:19:45,520 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:19:45,520 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:19:43" (1/3) ... [2023-11-19 05:19:45,521 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@120b4905 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:45, skipping insertion in model container [2023-11-19 05:19:45,522 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:43" (2/3) ... [2023-11-19 05:19:45,522 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@120b4905 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:45, skipping insertion in model container [2023-11-19 05:19:45,522 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:45" (3/3) ... [2023-11-19 05:19:45,524 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-2.i [2023-11-19 05:19:45,546 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:19:45,546 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 83 error locations. [2023-11-19 05:19:45,605 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:19:45,612 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;@303b169e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:19:45,612 INFO L358 AbstractCegarLoop]: Starting to check reachability of 83 error locations. [2023-11-19 05:19:45,617 INFO L276 IsEmpty]: Start isEmpty. Operand has 197 states, 95 states have (on average 2.2842105263157895) internal successors, (217), 183 states have internal predecessors, (217), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-19 05:19:45,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-19 05:19:45,627 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:45,627 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-19 05:19:45,628 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:45,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:45,636 INFO L85 PathProgramCache]: Analyzing trace with hash 546325, now seen corresponding path program 1 times [2023-11-19 05:19:45,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:45,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96125928] [2023-11-19 05:19:45,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:45,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:45,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:45,852 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:45,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:45,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96125928] [2023-11-19 05:19:45,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96125928] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:45,854 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:45,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:19:45,857 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169501345] [2023-11-19 05:19:45,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:45,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:19:45,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:45,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:19:45,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:19:45,921 INFO L87 Difference]: Start difference. First operand has 197 states, 95 states have (on average 2.2842105263157895) internal successors, (217), 183 states have internal predecessors, (217), 17 states have call successors, (17), 4 states have call predecessors, (17), 4 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) Second operand has 2 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) [2023-11-19 05:19:46,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:46,071 INFO L93 Difference]: Finished difference Result 195 states and 216 transitions. [2023-11-19 05:19:46,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:19:46,076 INFO L78 Accepts]: Start accepts. Automaton has has 2 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 [2023-11-19 05:19:46,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:46,100 INFO L225 Difference]: With dead ends: 195 [2023-11-19 05:19:46,101 INFO L226 Difference]: Without dead ends: 194 [2023-11-19 05:19:46,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:19:46,108 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:46,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 186 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:46,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2023-11-19 05:19:46,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2023-11-19 05:19:46,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 91 states have (on average 2.076923076923077) internal successors, (189), 180 states have internal predecessors, (189), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:46,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 215 transitions. [2023-11-19 05:19:46,176 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 215 transitions. Word has length 3 [2023-11-19 05:19:46,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:46,178 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 215 transitions. [2023-11-19 05:19:46,178 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 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) [2023-11-19 05:19:46,178 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 215 transitions. [2023-11-19 05:19:46,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:19:46,180 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:46,181 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:19:46,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:19:46,183 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting chain_nodeErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:46,188 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:46,188 INFO L85 PathProgramCache]: Analyzing trace with hash 17239633, now seen corresponding path program 1 times [2023-11-19 05:19:46,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:46,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13960835] [2023-11-19 05:19:46,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:46,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:46,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:46,492 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:46,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13960835] [2023-11-19 05:19:46,492 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13960835] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:46,492 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:46,493 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:19:46,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679914162] [2023-11-19 05:19:46,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:46,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:46,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:46,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:46,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:46,496 INFO L87 Difference]: Start difference. First operand 194 states and 215 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:46,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:46,806 INFO L93 Difference]: Finished difference Result 192 states and 213 transitions. [2023-11-19 05:19:46,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:46,807 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-19 05:19:46,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:46,811 INFO L225 Difference]: With dead ends: 192 [2023-11-19 05:19:46,812 INFO L226 Difference]: Without dead ends: 192 [2023-11-19 05:19:46,818 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 [2023-11-19 05:19:46,820 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 3 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:46,822 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 302 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:19:46,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2023-11-19 05:19:46,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 192. [2023-11-19 05:19:46,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 91 states have (on average 2.0549450549450547) internal successors, (187), 178 states have internal predecessors, (187), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:46,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 213 transitions. [2023-11-19 05:19:46,863 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 213 transitions. Word has length 4 [2023-11-19 05:19:46,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:46,864 INFO L495 AbstractCegarLoop]: Abstraction has 192 states and 213 transitions. [2023-11-19 05:19:46,864 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:46,864 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 213 transitions. [2023-11-19 05:19:46,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-19 05:19:46,865 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:46,865 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-19 05:19:46,865 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:19:46,866 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting chain_nodeErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:46,866 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:46,866 INFO L85 PathProgramCache]: Analyzing trace with hash 17239634, now seen corresponding path program 1 times [2023-11-19 05:19:46,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:46,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618910486] [2023-11-19 05:19:46,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:46,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:46,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:47,065 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:47,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:47,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618910486] [2023-11-19 05:19:47,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618910486] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:47,066 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:47,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:19:47,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379804543] [2023-11-19 05:19:47,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:47,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:19:47,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:47,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:19:47,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:19:47,070 INFO L87 Difference]: Start difference. First operand 192 states and 213 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:47,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:47,257 INFO L93 Difference]: Finished difference Result 190 states and 211 transitions. [2023-11-19 05:19:47,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:19:47,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-19 05:19:47,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:47,260 INFO L225 Difference]: With dead ends: 190 [2023-11-19 05:19:47,260 INFO L226 Difference]: Without dead ends: 190 [2023-11-19 05:19:47,260 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 [2023-11-19 05:19:47,262 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 1 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:47,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 305 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:19:47,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2023-11-19 05:19:47,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 190. [2023-11-19 05:19:47,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 91 states have (on average 2.032967032967033) internal successors, (185), 176 states have internal predecessors, (185), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:47,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 211 transitions. [2023-11-19 05:19:47,279 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 211 transitions. Word has length 4 [2023-11-19 05:19:47,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:47,279 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 211 transitions. [2023-11-19 05:19:47,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:47,280 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 211 transitions. [2023-11-19 05:19:47,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:19:47,281 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:47,281 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:19:47,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:19:47,282 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting chain_nodeErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:47,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:47,283 INFO L85 PathProgramCache]: Analyzing trace with hash -612565891, now seen corresponding path program 1 times [2023-11-19 05:19:47,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:47,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245472002] [2023-11-19 05:19:47,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:47,284 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:47,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:47,524 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:47,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:47,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245472002] [2023-11-19 05:19:47,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245472002] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:47,525 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:47,525 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:19:47,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953574771] [2023-11-19 05:19:47,526 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:47,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:19:47,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:47,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:19:47,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:19:47,528 INFO L87 Difference]: Start difference. First operand 190 states and 211 transitions. Second operand has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:47,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:47,918 INFO L93 Difference]: Finished difference Result 185 states and 206 transitions. [2023-11-19 05:19:47,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:19:47,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 05:19:47,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:47,920 INFO L225 Difference]: With dead ends: 185 [2023-11-19 05:19:47,921 INFO L226 Difference]: Without dead ends: 185 [2023-11-19 05:19:47,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:19:47,933 INFO L413 NwaCegarLoop]: 162 mSDtfsCounter, 36 mSDsluCounter, 426 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:47,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 588 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:19:47,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2023-11-19 05:19:47,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 185. [2023-11-19 05:19:47,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 91 states have (on average 1.978021978021978) internal successors, (180), 171 states have internal predecessors, (180), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:47,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 206 transitions. [2023-11-19 05:19:47,954 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 206 transitions. Word has length 6 [2023-11-19 05:19:47,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:47,954 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 206 transitions. [2023-11-19 05:19:47,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:47,955 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 206 transitions. [2023-11-19 05:19:47,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:19:47,955 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:47,956 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:19:47,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:19:47,958 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting chain_nodeErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:47,959 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:47,959 INFO L85 PathProgramCache]: Analyzing trace with hash -612565890, now seen corresponding path program 1 times [2023-11-19 05:19:47,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:47,959 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347784977] [2023-11-19 05:19:47,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:47,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:47,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:48,341 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:48,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:48,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347784977] [2023-11-19 05:19:48,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347784977] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:48,343 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:48,343 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:48,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212604861] [2023-11-19 05:19:48,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:48,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:19:48,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:48,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:19:48,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:19:48,347 INFO L87 Difference]: Start difference. First operand 185 states and 206 transitions. Second operand has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:48,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:48,756 INFO L93 Difference]: Finished difference Result 180 states and 201 transitions. [2023-11-19 05:19:48,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:19:48,757 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 05:19:48,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:48,758 INFO L225 Difference]: With dead ends: 180 [2023-11-19 05:19:48,759 INFO L226 Difference]: Without dead ends: 180 [2023-11-19 05:19:48,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:19:48,761 INFO L413 NwaCegarLoop]: 159 mSDtfsCounter, 29 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 416 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:48,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 416 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:19:48,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2023-11-19 05:19:48,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 180. [2023-11-19 05:19:48,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 91 states have (on average 1.9230769230769231) internal successors, (175), 166 states have internal predecessors, (175), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:48,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2023-11-19 05:19:48,780 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 6 [2023-11-19 05:19:48,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:48,781 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2023-11-19 05:19:48,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:48,781 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2023-11-19 05:19:48,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:19:48,782 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:48,782 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:48,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:19:48,784 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting chain_nodeErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:48,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:48,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1809673295, now seen corresponding path program 1 times [2023-11-19 05:19:48,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:48,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397197181] [2023-11-19 05:19:48,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:48,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:48,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:48,889 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:48,889 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397197181] [2023-11-19 05:19:48,890 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397197181] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:48,891 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:48,894 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:48,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234195755] [2023-11-19 05:19:48,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:48,896 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:19:48,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:48,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:19:48,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:19:48,898 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:49,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:49,137 INFO L93 Difference]: Finished difference Result 179 states and 200 transitions. [2023-11-19 05:19:49,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:19:49,138 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:19:49,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:49,140 INFO L225 Difference]: With dead ends: 179 [2023-11-19 05:19:49,140 INFO L226 Difference]: Without dead ends: 179 [2023-11-19 05:19:49,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:19:49,142 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 3 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:49,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 392 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 201 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:19:49,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-11-19 05:19:49,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2023-11-19 05:19:49,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 91 states have (on average 1.9120879120879122) internal successors, (174), 165 states have internal predecessors, (174), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:49,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 200 transitions. [2023-11-19 05:19:49,152 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 200 transitions. Word has length 7 [2023-11-19 05:19:49,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:49,153 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 200 transitions. [2023-11-19 05:19:49,153 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:49,153 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 200 transitions. [2023-11-19 05:19:49,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:19:49,154 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:49,154 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:49,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 05:19:49,155 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting chain_nodeErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:49,155 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:49,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1809673294, now seen corresponding path program 1 times [2023-11-19 05:19:49,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:49,156 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535377237] [2023-11-19 05:19:49,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:49,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:49,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:49,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:49,316 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:49,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535377237] [2023-11-19 05:19:49,317 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535377237] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:49,317 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:49,317 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:19:49,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312409091] [2023-11-19 05:19:49,318 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:49,318 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:19:49,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:49,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:19:49,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:19:49,320 INFO L87 Difference]: Start difference. First operand 179 states and 200 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:49,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:49,576 INFO L93 Difference]: Finished difference Result 178 states and 199 transitions. [2023-11-19 05:19:49,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:19:49,577 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:19:49,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:49,579 INFO L225 Difference]: With dead ends: 178 [2023-11-19 05:19:49,579 INFO L226 Difference]: Without dead ends: 178 [2023-11-19 05:19:49,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:19:49,581 INFO L413 NwaCegarLoop]: 168 mSDtfsCounter, 2 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:49,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 398 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:19:49,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2023-11-19 05:19:49,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2023-11-19 05:19:49,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 91 states have (on average 1.901098901098901) internal successors, (173), 164 states have internal predecessors, (173), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:49,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 199 transitions. [2023-11-19 05:19:49,593 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 199 transitions. Word has length 7 [2023-11-19 05:19:49,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:49,593 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 199 transitions. [2023-11-19 05:19:49,594 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:19:49,594 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 199 transitions. [2023-11-19 05:19:49,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:19:49,595 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:49,595 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:49,595 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 05:19:49,596 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:49,596 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:49,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1128380518, now seen corresponding path program 1 times [2023-11-19 05:19:49,597 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:49,597 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61642979] [2023-11-19 05:19:49,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:49,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:49,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:49,962 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:49,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:49,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61642979] [2023-11-19 05:19:49,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61642979] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:49,963 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:49,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:19:49,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465645952] [2023-11-19 05:19:49,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:49,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:19:49,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:49,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:19:49,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:19:49,966 INFO L87 Difference]: Start difference. First operand 178 states and 199 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:50,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:50,481 INFO L93 Difference]: Finished difference Result 177 states and 198 transitions. [2023-11-19 05:19:50,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:19:50,482 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-11-19 05:19:50,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:50,484 INFO L225 Difference]: With dead ends: 177 [2023-11-19 05:19:50,484 INFO L226 Difference]: Without dead ends: 177 [2023-11-19 05:19:50,485 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:19:50,487 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 151 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:50,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 296 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 05:19:50,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2023-11-19 05:19:50,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 177. [2023-11-19 05:19:50,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 91 states have (on average 1.89010989010989) internal successors, (172), 163 states have internal predecessors, (172), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:50,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 198 transitions. [2023-11-19 05:19:50,498 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 198 transitions. Word has length 13 [2023-11-19 05:19:50,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:50,500 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 198 transitions. [2023-11-19 05:19:50,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:50,501 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 198 transitions. [2023-11-19 05:19:50,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:19:50,501 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:50,502 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:50,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-19 05:19:50,503 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:50,503 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:50,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1128380517, now seen corresponding path program 1 times [2023-11-19 05:19:50,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:50,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534813985] [2023-11-19 05:19:50,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:50,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:50,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:50,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:50,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:50,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534813985] [2023-11-19 05:19:50,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1534813985] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:50,933 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:50,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:19:50,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543050469] [2023-11-19 05:19:50,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:50,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:19:50,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:50,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:19:50,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:19:50,938 INFO L87 Difference]: Start difference. First operand 177 states and 198 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:51,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:51,476 INFO L93 Difference]: Finished difference Result 176 states and 197 transitions. [2023-11-19 05:19:51,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:19:51,477 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-11-19 05:19:51,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:51,479 INFO L225 Difference]: With dead ends: 176 [2023-11-19 05:19:51,479 INFO L226 Difference]: Without dead ends: 176 [2023-11-19 05:19:51,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:19:51,480 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 96 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 406 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 406 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:51,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [96 Valid, 305 Invalid, 434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 406 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 05:19:51,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2023-11-19 05:19:51,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 176. [2023-11-19 05:19:51,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 176 states, 91 states have (on average 1.879120879120879) internal successors, (171), 162 states have internal predecessors, (171), 17 states have call successors, (17), 4 states have call predecessors, (17), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:19:51,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 197 transitions. [2023-11-19 05:19:51,489 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 197 transitions. Word has length 13 [2023-11-19 05:19:51,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:51,490 INFO L495 AbstractCegarLoop]: Abstraction has 176 states and 197 transitions. [2023-11-19 05:19:51,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:51,490 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 197 transitions. [2023-11-19 05:19:51,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 05:19:51,491 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:51,491 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:51,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-19 05:19:51,492 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [failErr0ASSERT_VIOLATIONMEMORY_LEAK, check_seq_nextErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, check_seq_nextErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 80 more)] === [2023-11-19 05:19:51,493 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:51,493 INFO L85 PathProgramCache]: Analyzing trace with hash 409232331, now seen corresponding path program 1 times [2023-11-19 05:19:51,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:51,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052339865] [2023-11-19 05:19:51,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:51,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:51,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:52,272 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:19:52,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:52,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052339865] [2023-11-19 05:19:52,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052339865] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:52,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644933570] [2023-11-19 05:19:52,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:52,274 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:52,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:52,277 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:52,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b0da9e25-eb0c-4d82-83f0-87879000ff04/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:19:52,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:52,497 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 05:19:52,506 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:52,604 INFO L349 Elim1Store]: treesize reduction 28, result has 30.0 percent of original size [2023-11-19 05:19:52,605 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 12 [2023-11-19 05:19:52,641 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-19 05:19:52,642 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 9 [2023-11-19 05:19:52,690 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_alloc_node_~ptr~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |chain_node_alloc_node_~ptr~0#1.base| 1))) is different from true [2023-11-19 05:19:52,740 INFO L349 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-11-19 05:19:52,741 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 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 19 treesize of output 25 [2023-11-19 05:19:53,074 WARN L876 $PredicateComparison]: unable to prove that (exists ((|chain_node_~node~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |chain_node_~node~0#1.base| 1))) is different from true [2023-11-19 05:19:53,318 INFO L349 Elim1Store]: treesize reduction 50, result has 71.6 percent of original size [2023-11-19 05:19:53,318 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 44 treesize of output 156 [2023-11-19 05:20:25,271 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 6 not checked. [2023-11-19 05:20:25,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:25,845 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:20:25,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644933570] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:20:25,846 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [648543922] [2023-11-19 05:20:25,875 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:20:25,875 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:20:25,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:20:25,888 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:20:25,889 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs