./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_insert_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b 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_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_insert_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 b7b415e0519ab150e9247d3d9d0133f92cfd07c34f9918f9ebd19cf8109bf4e7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:03:27,424 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:03:27,507 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 21:03:27,513 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:03:27,514 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:03:27,542 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:03:27,543 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:03:27,544 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:03:27,545 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:03:27,546 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:03:27,547 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:03:27,547 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:03:27,548 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:03:27,549 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:03:27,549 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:03:27,550 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:03:27,551 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:03:27,551 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:03:27,552 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:03:27,553 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:03:27,553 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:03:27,554 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:03:27,555 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 21:03:27,556 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 21:03:27,556 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:03:27,557 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:03:27,557 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:03:27,558 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:03:27,559 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:03:27,559 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 21:03:27,560 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 21:03:27,560 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 21:03:27,560 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:03:27,561 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 21:03:27,561 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 21:03:27,561 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:03:27,562 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:03:27,562 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:03:27,562 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:03:27,563 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:03:27,563 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:03:27,564 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:03:27,564 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:03:27,564 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:03:27,565 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:03:27,565 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:03:27,565 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_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b7b415e0519ab150e9247d3d9d0133f92cfd07c34f9918f9ebd19cf8109bf4e7 [2023-11-06 21:03:27,936 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:03:27,957 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:03:27,960 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:03:27,962 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:03:27,962 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:03:27,964 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-simple/sll2c_insert_unequal.i [2023-11-06 21:03:31,104 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:03:31,437 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:03:31,437 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/sv-benchmarks/c/list-simple/sll2c_insert_unequal.i [2023-11-06 21:03:31,456 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/data/e47d07c0e/9cc94c76f0b545688b10db271e1d87d2/FLAG7ccdb08bc [2023-11-06 21:03:31,486 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/data/e47d07c0e/9cc94c76f0b545688b10db271e1d87d2 [2023-11-06 21:03:31,493 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:03:31,495 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:03:31,496 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:03:31,496 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:03:31,501 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:03:31,502 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:03:31" (1/1) ... [2023-11-06 21:03:31,503 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3326ccd9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:31, skipping insertion in model container [2023-11-06 21:03:31,503 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:03:31" (1/1) ... [2023-11-06 21:03:31,559 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:03:31,963 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:03:31,974 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:03:32,022 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:03:32,053 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:03:32,054 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32 WrapperNode [2023-11-06 21:03:32,054 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:03:32,055 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:03:32,055 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:03:32,055 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:03:32,063 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,079 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,111 INFO L138 Inliner]: procedures = 127, calls = 49, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 183 [2023-11-06 21:03:32,112 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:03:32,112 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:03:32,113 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:03:32,113 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:03:32,123 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,128 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,133 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,135 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,158 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,172 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,175 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,178 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,183 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:03:32,191 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:03:32,191 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:03:32,191 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:03:32,192 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (1/1) ... [2023-11-06 21:03:32,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:03:32,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:32,250 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:03:32,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:03:32,295 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 21:03:32,295 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 21:03:32,295 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-06 21:03:32,295 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-06 21:03:32,295 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 21:03:32,295 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:03:32,296 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:03:32,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:03:32,448 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:03:32,450 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:03:32,946 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:03:33,052 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:03:33,052 INFO L302 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-06 21:03:33,056 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:03:33 BoogieIcfgContainer [2023-11-06 21:03:33,057 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:03:33,061 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:03:33,061 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:03:33,065 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:03:33,065 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:03:31" (1/3) ... [2023-11-06 21:03:33,067 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@223b967b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:03:33, skipping insertion in model container [2023-11-06 21:03:33,068 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:32" (2/3) ... [2023-11-06 21:03:33,070 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@223b967b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:03:33, skipping insertion in model container [2023-11-06 21:03:33,070 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:03:33" (3/3) ... [2023-11-06 21:03:33,072 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_insert_unequal.i [2023-11-06 21:03:33,093 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:03:33,093 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 62 error locations. [2023-11-06 21:03:33,167 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:03:33,174 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;@5adfb12f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:03:33,174 INFO L358 AbstractCegarLoop]: Starting to check reachability of 62 error locations. [2023-11-06 21:03:33,178 INFO L276 IsEmpty]: Start isEmpty. Operand has 126 states, 59 states have (on average 2.3220338983050848) internal successors, (137), 121 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:33,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 21:03:33,186 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:33,187 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 21:03:33,187 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:33,193 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:33,193 INFO L85 PathProgramCache]: Analyzing trace with hash 271590832, now seen corresponding path program 1 times [2023-11-06 21:03:33,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:33,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909983255] [2023-11-06 21:03:33,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:33,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:33,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:33,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:03:33,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:33,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909983255] [2023-11-06 21:03:33,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909983255] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:33,623 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:33,623 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:03:33,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75895009] [2023-11-06 21:03:33,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:33,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:33,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:33,679 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:33,680 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:03:33,684 INFO L87 Difference]: Start difference. First operand has 126 states, 59 states have (on average 2.3220338983050848) internal successors, (137), 121 states have internal predecessors, (137), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 21:03:33,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:33,913 INFO L93 Difference]: Finished difference Result 123 states and 136 transitions. [2023-11-06 21:03:33,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:33,916 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-06 21:03:33,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:33,927 INFO L225 Difference]: With dead ends: 123 [2023-11-06 21:03:33,927 INFO L226 Difference]: Without dead ends: 121 [2023-11-06 21:03:33,929 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 [2023-11-06 21:03:33,933 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:33,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 176 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:03:33,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2023-11-06 21:03:33,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2023-11-06 21:03:33,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 57 states have (on average 2.2280701754385963) internal successors, (127), 116 states have internal predecessors, (127), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:33,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 133 transitions. [2023-11-06 21:03:33,995 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 133 transitions. Word has length 5 [2023-11-06 21:03:33,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:33,997 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 133 transitions. [2023-11-06 21:03:33,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 21:03:33,998 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 133 transitions. [2023-11-06 21:03:33,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 21:03:33,998 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:33,998 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 21:03:33,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:03:34,000 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:34,001 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:34,002 INFO L85 PathProgramCache]: Analyzing trace with hash 271590833, now seen corresponding path program 1 times [2023-11-06 21:03:34,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:34,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269106312] [2023-11-06 21:03:34,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:34,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:34,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:34,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:03:34,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:34,117 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269106312] [2023-11-06 21:03:34,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269106312] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:34,118 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:34,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 21:03:34,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895248129] [2023-11-06 21:03:34,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:34,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:34,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:34,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:34,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:03:34,121 INFO L87 Difference]: Start difference. First operand 121 states and 133 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 21:03:34,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:34,242 INFO L93 Difference]: Finished difference Result 119 states and 131 transitions. [2023-11-06 21:03:34,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:34,243 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-06 21:03:34,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:34,245 INFO L225 Difference]: With dead ends: 119 [2023-11-06 21:03:34,245 INFO L226 Difference]: Without dead ends: 119 [2023-11-06 21:03:34,245 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 [2023-11-06 21:03:34,247 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 2 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:34,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 181 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:34,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-11-06 21:03:34,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-11-06 21:03:34,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 57 states have (on average 2.192982456140351) internal successors, (125), 114 states have internal predecessors, (125), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:34,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 131 transitions. [2023-11-06 21:03:34,259 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 131 transitions. Word has length 5 [2023-11-06 21:03:34,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:34,259 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 131 transitions. [2023-11-06 21:03:34,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 21:03:34,260 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 131 transitions. [2023-11-06 21:03:34,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 21:03:34,260 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:34,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:34,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 21:03:34,261 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:34,261 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:34,262 INFO L85 PathProgramCache]: Analyzing trace with hash -366380054, now seen corresponding path program 1 times [2023-11-06 21:03:34,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:34,262 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951960752] [2023-11-06 21:03:34,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:34,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:34,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:34,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:03:34,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:34,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951960752] [2023-11-06 21:03:34,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951960752] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:34,396 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:34,397 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 21:03:34,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463808938] [2023-11-06 21:03:34,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:34,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:34,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:34,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:34,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:03:34,399 INFO L87 Difference]: Start difference. First operand 119 states and 131 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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) [2023-11-06 21:03:34,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:34,447 INFO L93 Difference]: Finished difference Result 120 states and 132 transitions. [2023-11-06 21:03:34,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:34,447 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 10 [2023-11-06 21:03:34,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:34,454 INFO L225 Difference]: With dead ends: 120 [2023-11-06 21:03:34,454 INFO L226 Difference]: Without dead ends: 120 [2023-11-06 21:03:34,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 21:03:34,456 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 4 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:34,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 218 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 21:03:34,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-11-06 21:03:34,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2023-11-06 21:03:34,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 58 states have (on average 2.1724137931034484) internal successors, (126), 115 states have internal predecessors, (126), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:34,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 132 transitions. [2023-11-06 21:03:34,468 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 132 transitions. Word has length 10 [2023-11-06 21:03:34,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:34,470 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 132 transitions. [2023-11-06 21:03:34,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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) [2023-11-06 21:03:34,470 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 132 transitions. [2023-11-06 21:03:34,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 21:03:34,471 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:34,471 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:34,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 21:03:34,472 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:34,472 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:34,473 INFO L85 PathProgramCache]: Analyzing trace with hash -544533673, now seen corresponding path program 1 times [2023-11-06 21:03:34,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:34,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052561842] [2023-11-06 21:03:34,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:34,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:34,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:34,677 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 21:03:34,677 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:34,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052561842] [2023-11-06 21:03:34,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052561842] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:34,678 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:34,678 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 21:03:34,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628451995] [2023-11-06 21:03:34,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:34,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 21:03:34,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:34,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 21:03:34,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 21:03:34,682 INFO L87 Difference]: Start difference. First operand 120 states and 132 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 21:03:34,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:34,976 INFO L93 Difference]: Finished difference Result 119 states and 131 transitions. [2023-11-06 21:03:34,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:03:34,977 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-06 21:03:34,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:34,978 INFO L225 Difference]: With dead ends: 119 [2023-11-06 21:03:34,978 INFO L226 Difference]: Without dead ends: 119 [2023-11-06 21:03:34,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-06 21:03:34,981 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 3 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 286 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:34,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 356 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 286 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 21:03:34,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-11-06 21:03:34,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-11-06 21:03:34,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 114 states have internal predecessors, (125), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:34,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 131 transitions. [2023-11-06 21:03:34,992 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 131 transitions. Word has length 17 [2023-11-06 21:03:34,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:34,993 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 131 transitions. [2023-11-06 21:03:34,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 21:03:34,993 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 131 transitions. [2023-11-06 21:03:34,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 21:03:34,994 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:34,994 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:34,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 21:03:34,995 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:34,995 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:34,996 INFO L85 PathProgramCache]: Analyzing trace with hash -544533672, now seen corresponding path program 1 times [2023-11-06 21:03:34,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:34,996 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988857256] [2023-11-06 21:03:34,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:34,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:35,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:35,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:35,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:35,231 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988857256] [2023-11-06 21:03:35,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988857256] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:35,232 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:35,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 21:03:35,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069047558] [2023-11-06 21:03:35,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:35,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 21:03:35,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:35,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 21:03:35,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 21:03:35,235 INFO L87 Difference]: Start difference. First operand 119 states and 131 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 21:03:35,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:35,469 INFO L93 Difference]: Finished difference Result 118 states and 130 transitions. [2023-11-06 21:03:35,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 21:03:35,470 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-06 21:03:35,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:35,471 INFO L225 Difference]: With dead ends: 118 [2023-11-06 21:03:35,471 INFO L226 Difference]: Without dead ends: 118 [2023-11-06 21:03:35,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-06 21:03:35,473 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 1 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:35,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 380 Invalid, 258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:03:35,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-11-06 21:03:35,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2023-11-06 21:03:35,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 58 states have (on average 2.1379310344827585) internal successors, (124), 113 states have internal predecessors, (124), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:35,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 130 transitions. [2023-11-06 21:03:35,482 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 130 transitions. Word has length 17 [2023-11-06 21:03:35,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:35,483 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 130 transitions. [2023-11-06 21:03:35,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 21:03:35,484 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 130 transitions. [2023-11-06 21:03:35,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 21:03:35,484 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:35,484 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:35,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 21:03:35,485 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:35,485 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:35,486 INFO L85 PathProgramCache]: Analyzing trace with hash 689394167, now seen corresponding path program 1 times [2023-11-06 21:03:35,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:35,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916242714] [2023-11-06 21:03:35,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:35,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:35,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:35,765 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:35,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:35,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916242714] [2023-11-06 21:03:35,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916242714] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:35,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106049062] [2023-11-06 21:03:35,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:35,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:35,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:35,776 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:35,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:03:35,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:35,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-06 21:03:35,937 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:35,990 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-06 21:03:36,087 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-06 21:03:36,088 INFO L351 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 14 treesize of output 13 [2023-11-06 21:03:36,175 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:36,175 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:03:36,589 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:36,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106049062] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:03:36,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196383284] [2023-11-06 21:03:36,609 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:03:36,609 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:03:36,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:03:36,619 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:03:36,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:03:38,431 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-06 21:03:38,572 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:03:40,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1476#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-06 21:03:40,769 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:03:40,769 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:03:40,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 17 [2023-11-06 21:03:40,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069968758] [2023-11-06 21:03:40,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:03:40,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-06 21:03:40,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:40,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-06 21:03:40,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=748, Unknown=1, NotChecked=0, Total=870 [2023-11-06 21:03:40,772 INFO L87 Difference]: Start difference. First operand 118 states and 130 transitions. Second operand has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:03:41,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:41,444 INFO L93 Difference]: Finished difference Result 117 states and 129 transitions. [2023-11-06 21:03:41,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:03:41,445 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 19 [2023-11-06 21:03:41,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:41,446 INFO L225 Difference]: With dead ends: 117 [2023-11-06 21:03:41,446 INFO L226 Difference]: Without dead ends: 117 [2023-11-06 21:03:41,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=133, Invalid=796, Unknown=1, NotChecked=0, Total=930 [2023-11-06 21:03:41,448 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 4 mSDsluCounter, 702 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 806 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:41,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 806 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-06 21:03:41,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-06 21:03:41,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2023-11-06 21:03:41,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 112 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:41,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 129 transitions. [2023-11-06 21:03:41,457 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 129 transitions. Word has length 19 [2023-11-06 21:03:41,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:41,457 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 129 transitions. [2023-11-06 21:03:41,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 21:03:41,458 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 129 transitions. [2023-11-06 21:03:41,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 21:03:41,459 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:41,459 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:41,471 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:41,665 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:41,666 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:41,666 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:41,666 INFO L85 PathProgramCache]: Analyzing trace with hash 689394168, now seen corresponding path program 1 times [2023-11-06 21:03:41,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:41,667 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136667367] [2023-11-06 21:03:41,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:41,667 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:41,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:42,078 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:42,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:42,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136667367] [2023-11-06 21:03:42,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [136667367] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:42,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408451492] [2023-11-06 21:03:42,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:42,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:42,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:42,084 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:42,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:03:42,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:42,216 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-06 21:03:42,224 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:42,239 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-06 21:03:42,245 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-06 21:03:42,414 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-06 21:03:42,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:03:42,451 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-06 21:03:42,463 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-06 21:03:42,464 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-06 21:03:42,499 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2023-11-06 21:03:42,499 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:03:42,655 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408451492] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:42,655 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705237407] [2023-11-06 21:03:42,657 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 21:03:42,658 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:03:42,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:03:42,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:03:42,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:03:43,644 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-06 21:03:43,762 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:03:45,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1811#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-06 21:03:45,864 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:03:45,864 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 21:03:45,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2023-11-06 21:03:45,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666665804] [2023-11-06 21:03:45,865 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 21:03:45,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-06 21:03:45,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:45,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-06 21:03:45,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=721, Unknown=1, NotChecked=54, Total=870 [2023-11-06 21:03:45,867 INFO L87 Difference]: Start difference. First operand 117 states and 129 transitions. Second operand has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-06 21:03:46,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:46,624 INFO L93 Difference]: Finished difference Result 117 states and 130 transitions. [2023-11-06 21:03:46,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 21:03:46,625 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-11-06 21:03:46,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:46,627 INFO L225 Difference]: With dead ends: 117 [2023-11-06 21:03:46,628 INFO L226 Difference]: Without dead ends: 117 [2023-11-06 21:03:46,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=125, Invalid=934, Unknown=1, NotChecked=62, Total=1122 [2023-11-06 21:03:46,630 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 3 mSDsluCounter, 567 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:46,631 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 671 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 699 Invalid, 0 Unknown, 126 Unchecked, 0.6s Time] [2023-11-06 21:03:46,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-06 21:03:46,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2023-11-06 21:03:46,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 58 states have (on average 2.103448275862069) internal successors, (122), 111 states have internal predecessors, (122), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:46,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 128 transitions. [2023-11-06 21:03:46,650 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 128 transitions. Word has length 19 [2023-11-06 21:03:46,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:46,651 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 128 transitions. [2023-11-06 21:03:46,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-06 21:03:46,651 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 128 transitions. [2023-11-06 21:03:46,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 21:03:46,653 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:46,653 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:46,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:46,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:46,864 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:46,864 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:46,865 INFO L85 PathProgramCache]: Analyzing trace with hash -227971471, now seen corresponding path program 1 times [2023-11-06 21:03:46,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:46,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404873483] [2023-11-06 21:03:46,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:46,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:46,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:47,676 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 21:03:47,676 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:47,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404873483] [2023-11-06 21:03:47,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404873483] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:47,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1082742329] [2023-11-06 21:03:47,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:47,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:47,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:47,680 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:47,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:03:47,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:47,849 INFO L262 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-06 21:03:47,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:47,855 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-06 21:03:47,892 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-06 21:03:47,892 INFO L351 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 14 treesize of output 13 [2023-11-06 21:03:47,943 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-06 21:03:47,966 INFO L322 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2023-11-06 21:03:47,966 INFO L351 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 16 treesize of output 22 [2023-11-06 21:03:48,083 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-06 21:03:48,084 INFO L351 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 12 treesize of output 14 [2023-11-06 21:03:48,108 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 8 not checked. [2023-11-06 21:03:48,109 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:03:48,713 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 21:03:48,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1082742329] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 21:03:48,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1524141617] [2023-11-06 21:03:48,716 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-06 21:03:48,716 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:03:48,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:03:48,717 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:03:48,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 21:03:49,948 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-06 21:03:49,971 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 21:03:52,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2243#(and (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~mid_index~0#1| 1) (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.offset| 0) (= |ULTIMATE.start_sll_circular_insert_#in~index#1| 1) (= |ULTIMATE.start_sll_circular_insert_~index#1| 1) (or (and (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 1) (exists ((|v_#memory_$Pointer$.offset_142| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#memory_int_114| (Array Int (Array Int Int))) (|v_#memory_int_113| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) |v_#memory_int_114|) (= |#memory_int| (store |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 5))))) (exists ((|v_#length_140| (Array Int Int))) (= |#length| (store |v_#length_140| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (exists ((|v_#valid_169| (Array Int Int))) (and (= (select |v_#valid_169| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_169| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|))) (<= 8 (select |#length| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|)) (exists ((|v_#memory_$Pointer$.base_142| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (exists ((|v_old(#valid)_AFTER_CALL_30| (Array Int Int)) (|v_#memory_int_117| (Array Int (Array Int Int))) (|v_old(#length)_AFTER_CALL_30| (Array Int Int)) (|v_#memory_$Pointer$.base_146| (Array Int (Array Int Int))) (|v_#memory_int_BEFORE_CALL_50| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_146| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (= (select (select (store |v_#memory_$Pointer$.base_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (<= 4 (select |v_old(#length)_AFTER_CALL_30| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (= (select (select (store |v_#memory_$Pointer$.offset_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (store |v_#memory_int_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |v_#memory_int_BEFORE_CALL_50| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0))) |v_#memory_int_BEFORE_CALL_50|) (= (select |v_old(#valid)_AFTER_CALL_30| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 1))) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|)) (and (not (= |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 1) (exists ((|v_old(#valid)_AFTER_CALL_31| (Array Int Int)) (|v_#memory_int_117| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_146| (Array Int (Array Int Int))) (|v_#length_BEFORE_CALL_54| (Array Int Int)) (|v_#memory_$Pointer$.offset_146| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_31| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (= (select (select (store |v_#memory_$Pointer$.base_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= (select (select (store |v_#memory_$Pointer$.offset_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= 1 (select |v_old(#valid)_AFTER_CALL_31| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (<= 4 (select |v_#length_BEFORE_CALL_54| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (= |v_old(#memory_int)_AFTER_CALL_31| (store |v_#memory_int_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_31| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0)))))) (exists ((|v_#memory_$Pointer$.offset_142| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_insert_~head#1.base| |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (exists ((|v_#memory_int_114| (Array Int (Array Int Int))) (|v_#memory_int_113| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_113| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 (select (select |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0))) |v_#memory_int_114|) (= |#memory_int| (store |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (select |v_#memory_int_114| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4 5))))) (exists ((|v_#length_140| (Array Int Int))) (= |#length| (store |v_#length_140| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 8))) (exists ((|v_#valid_169| (Array Int Int))) (and (= (select |v_#valid_169| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_169| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| 1) |#valid|))) (<= 8 (select |#length| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|)) (exists ((|v_#memory_$Pointer$.base_142| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_142| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_insert_~new_node~0#1.base|) 4))) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_sll_circular_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|))) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~uneq~0#1| 5) (= 5 |ULTIMATE.start_sll_circular_insert_~data#1|) (= |ULTIMATE.start_sll_circular_insert_~snd_to_last~0#1.base| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_insert_~head#1.offset| 0) (<= 2 |ULTIMATE.start_sll_circular_insert_#in~head#1.base|) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_sll_circular_insert_~head#1.base|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_insert_~head#1.base|) 1)) (= |ULTIMATE.start_sll_circular_insert_#in~data#1| 5) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-06 21:03:52,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 21:03:52,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 21:03:52,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 21 [2023-11-06 21:03:52,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595189534] [2023-11-06 21:03:52,701 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 21:03:52,702 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 21:03:52,702 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:52,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 21:03:52,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1191, Unknown=4, NotChecked=70, Total=1406 [2023-11-06 21:03:52,705 INFO L87 Difference]: Start difference. First operand 116 states and 128 transitions. Second operand has 23 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 20 states have internal predecessors, (50), 4 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) [2023-11-06 21:03:53,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:53,509 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2023-11-06 21:03:53,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:03:53,510 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 20 states have internal predecessors, (50), 4 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) Word has length 27 [2023-11-06 21:03:53,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:53,512 INFO L225 Difference]: With dead ends: 124 [2023-11-06 21:03:53,512 INFO L226 Difference]: Without dead ends: 124 [2023-11-06 21:03:53,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 50 SyntacticMatches, 8 SemanticMatches, 39 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 491 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=178, Invalid=1380, Unknown=6, NotChecked=76, Total=1640 [2023-11-06 21:03:53,514 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 238 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 132 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:53,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 389 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 567 Invalid, 0 Unknown, 132 Unchecked, 0.6s Time] [2023-11-06 21:03:53,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-11-06 21:03:53,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 107. [2023-11-06 21:03:53,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 58 states have (on average 1.9482758620689655) internal successors, (113), 102 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:53,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 119 transitions. [2023-11-06 21:03:53,522 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 119 transitions. Word has length 27 [2023-11-06 21:03:53,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:53,523 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 119 transitions. [2023-11-06 21:03:53,524 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 17 states have (on average 2.9411764705882355) internal successors, (50), 20 states have internal predecessors, (50), 4 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 6 states have call predecessors, (9), 4 states have call successors, (9) [2023-11-06 21:03:53,524 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 119 transitions. [2023-11-06 21:03:53,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 21:03:53,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:53,525 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:53,541 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-06 21:03:53,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:53,733 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:53,733 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:53,734 INFO L85 PathProgramCache]: Analyzing trace with hash -227971470, now seen corresponding path program 1 times [2023-11-06 21:03:53,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:53,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602862885] [2023-11-06 21:03:53,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:53,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:53,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:54,610 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:54,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:54,610 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1602862885] [2023-11-06 21:03:54,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1602862885] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:54,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321357418] [2023-11-06 21:03:54,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:54,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:54,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:54,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:54,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:03:54,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:54,782 INFO L262 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-06 21:03:54,787 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:54,796 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-06 21:03:54,806 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 21:03:54,815 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-06 21:03:54,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:03:54,849 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-06 21:03:54,876 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 21:03:54,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:03:54,910 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-06 21:03:54,971 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-06 21:03:55,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:03:55,014 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-06 21:03:55,022 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-06 21:03:55,022 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:55,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321357418] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:55,022 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:55,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12] total 14 [2023-11-06 21:03:55,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724786450] [2023-11-06 21:03:55,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:55,024 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 21:03:55,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:55,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 21:03:55,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=168, Unknown=1, NotChecked=26, Total=240 [2023-11-06 21:03:55,025 INFO L87 Difference]: Start difference. First operand 107 states and 119 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:03:55,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:55,284 INFO L93 Difference]: Finished difference Result 102 states and 114 transitions. [2023-11-06 21:03:55,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 21:03:55,285 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-11-06 21:03:55,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:55,286 INFO L225 Difference]: With dead ends: 102 [2023-11-06 21:03:55,286 INFO L226 Difference]: Without dead ends: 102 [2023-11-06 21:03:55,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=192, Unknown=1, NotChecked=28, Total=272 [2023-11-06 21:03:55,287 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 30 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 135 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:55,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 275 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 219 Invalid, 0 Unknown, 135 Unchecked, 0.2s Time] [2023-11-06 21:03:55,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-06 21:03:55,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2023-11-06 21:03:55,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 58 states have (on average 1.8620689655172413) internal successors, (108), 97 states have internal predecessors, (108), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 21:03:55,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 114 transitions. [2023-11-06 21:03:55,292 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 114 transitions. Word has length 27 [2023-11-06 21:03:55,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:55,293 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 114 transitions. [2023-11-06 21:03:55,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 21:03:55,293 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 114 transitions. [2023-11-06 21:03:55,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-06 21:03:55,294 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:55,294 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:55,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:55,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:55,503 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 59 more)] === [2023-11-06 21:03:55,503 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:55,503 INFO L85 PathProgramCache]: Analyzing trace with hash -37031049, now seen corresponding path program 1 times [2023-11-06 21:03:55,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:55,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804435289] [2023-11-06 21:03:55,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:55,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:55,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:56,149 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 21:03:56,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:56,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804435289] [2023-11-06 21:03:56,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804435289] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:56,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807111055] [2023-11-06 21:03:56,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:56,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:56,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:56,151 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:56,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_827269cf-0ed1-4964-ae88-bcc2ddb1ddf4/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:03:56,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:56,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-06 21:03:56,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:56,368 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-06 21:03:56,528 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2023-11-06 21:03:56,647 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-06 21:03:56,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 21:03:56,659 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 13 [2023-11-06 21:03:56,680 INFO L322 Elim1Store]: treesize reduction 32, result has 36.0 percent of original size [2023-11-06 21:03:56,681 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 24 [2023-11-06 21:03:56,718 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-06 21:03:56,722 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-06 21:03:56,722 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 21:03:56,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807111055] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:56,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [160964268] [2023-11-06 21:03:56,847 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-06 21:03:56,848 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 21:03:56,848 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 21:03:56,848 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 21:03:56,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs