./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memcleanup.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (memcleanup) 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_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/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_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/config/svcomp-MemCleanup-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/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-memcleanup) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 68e1c5cf050539b3ee8f058d38ff7af5aea2a400d05e41e0185e4509f45301e0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:33:52,333 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:33:52,461 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/config/svcomp-MemCleanup-32bit-Taipan_Default.epf [2023-11-06 20:33:52,475 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:33:52,476 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:33:52,518 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:33:52,519 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:33:52,520 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:33:52,521 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:33:52,526 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:33:52,527 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:33:52,528 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:33:52,528 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:33:52,530 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:33:52,531 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:33:52,531 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:33:52,532 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:33:52,532 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:33:52,532 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:33:52,533 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:33:52,533 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:33:52,534 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:33:52,535 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 20:33:52,535 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 20:33:52,536 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:33:52,536 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:33:52,536 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:33:52,537 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:33:52,537 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:33:52,538 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 20:33:52,539 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 20:33:52,539 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:33:52,546 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 20:33:52,546 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 20:33:52,546 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:33:52,547 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:33:52,547 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:33:52,547 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:33:52,548 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:33:52,548 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:33:52,548 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:33:52,549 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:33:52,549 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:33:52,549 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:33:52,550 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:33:52,550 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_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-memcleanup) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68e1c5cf050539b3ee8f058d38ff7af5aea2a400d05e41e0185e4509f45301e0 [2023-11-06 20:33:52,922 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:33:52,958 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:33:52,961 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:33:52,962 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:33:52,963 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:33:52,966 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i [2023-11-06 20:33:56,445 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:33:56,790 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:33:56,793 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-2.i [2023-11-06 20:33:56,814 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/data/7c87e07f1/ebfcbf6c399c42738f16a31e010c812c/FLAG7b859adf2 [2023-11-06 20:33:56,830 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/data/7c87e07f1/ebfcbf6c399c42738f16a31e010c812c [2023-11-06 20:33:56,833 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:33:56,834 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:33:56,836 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:33:56,836 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:33:56,844 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:33:56,845 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:33:56" (1/1) ... [2023-11-06 20:33:56,847 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c6fdfbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:56, skipping insertion in model container [2023-11-06 20:33:56,847 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:33:56" (1/1) ... [2023-11-06 20:33:56,913 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:33:57,373 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:33:57,387 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:33:57,457 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:33:57,493 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:33:57,493 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57 WrapperNode [2023-11-06 20:33:57,494 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:33:57,495 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:33:57,495 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:33:57,495 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:33:57,502 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,516 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,547 INFO L138 Inliner]: procedures = 129, calls = 41, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 193 [2023-11-06 20:33:57,548 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:33:57,548 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:33:57,548 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:33:57,549 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:33:57,560 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,561 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,566 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,566 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,577 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,583 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,586 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,588 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,593 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:33:57,594 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:33:57,594 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:33:57,594 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:33:57,595 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (1/1) ... [2023-11-06 20:33:57,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:33:57,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:33:57,636 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:33:57,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-06 20:33:57,689 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 20:33:57,689 INFO L130 BoogieDeclarations]: Found specification of procedure sll_append [2023-11-06 20:33:57,690 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_append [2023-11-06 20:33:57,690 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 20:33:57,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:33:57,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-06 20:33:57,690 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:33:57,690 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:33:57,690 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:33:57,837 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:33:57,839 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:33:57,868 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-06 20:33:58,238 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:33:58,350 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:33:58,350 INFO L302 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-06 20:33:58,353 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:33:58 BoogieIcfgContainer [2023-11-06 20:33:58,353 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:33:58,356 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:33:58,356 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:33:58,360 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:33:58,360 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:33:56" (1/3) ... [2023-11-06 20:33:58,361 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@81849e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:33:58, skipping insertion in model container [2023-11-06 20:33:58,361 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:33:57" (2/3) ... [2023-11-06 20:33:58,362 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@81849e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:33:58, skipping insertion in model container [2023-11-06 20:33:58,362 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:33:58" (3/3) ... [2023-11-06 20:33:58,364 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-2.i [2023-11-06 20:33:58,385 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:33:58,385 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2023-11-06 20:33:58,441 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:33:58,449 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;@641a21eb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:33:58,449 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2023-11-06 20:33:58,455 INFO L276 IsEmpty]: Start isEmpty. Operand has 102 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 97 states have internal predecessors, (115), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-06 20:33:58,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:33:58,463 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:58,464 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:58,465 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:33:58,471 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:58,472 INFO L85 PathProgramCache]: Analyzing trace with hash -321710013, now seen corresponding path program 1 times [2023-11-06 20:33:58,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:58,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404399696] [2023-11-06 20:33:58,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:58,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:58,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:58,938 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 20:33:58,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:58,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404399696] [2023-11-06 20:33:58,940 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404399696] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:58,941 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:33:58,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:33:58,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797760922] [2023-11-06 20:33:58,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:58,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:33:58,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:59,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:33:59,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:33:59,049 INFO L87 Difference]: Start difference. First operand has 102 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 97 states have internal predecessors, (115), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 20:33:59,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:59,236 INFO L93 Difference]: Finished difference Result 107 states and 124 transitions. [2023-11-06 20:33:59,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:33:59,239 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 8 [2023-11-06 20:33:59,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:59,252 INFO L225 Difference]: With dead ends: 107 [2023-11-06 20:33:59,252 INFO L226 Difference]: Without dead ends: 102 [2023-11-06 20:33:59,254 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 20:33:59,259 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 5 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:59,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 173 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:33:59,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-06 20:33:59,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 97. [2023-11-06 20:33:59,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 52 states have (on average 2.0384615384615383) internal successors, (106), 93 states have internal predecessors, (106), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-06 20:33:59,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 110 transitions. [2023-11-06 20:33:59,330 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 110 transitions. Word has length 8 [2023-11-06 20:33:59,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:59,330 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 110 transitions. [2023-11-06 20:33:59,331 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 20:33:59,331 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 110 transitions. [2023-11-06 20:33:59,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 20:33:59,332 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:59,332 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:59,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:33:59,334 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:33:59,335 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:59,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1075801393, now seen corresponding path program 1 times [2023-11-06 20:33:59,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:59,336 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1296688295] [2023-11-06 20:33:59,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:59,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:33:59,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:59,659 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 20:33:59,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:33:59,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1296688295] [2023-11-06 20:33:59,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1296688295] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:33:59,660 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:33:59,660 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:33:59,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328035052] [2023-11-06 20:33:59,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:33:59,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:33:59,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:33:59,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:33:59,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:33:59,663 INFO L87 Difference]: Start difference. First operand 97 states and 110 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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 20:33:59,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:33:59,931 INFO L93 Difference]: Finished difference Result 143 states and 160 transitions. [2023-11-06 20:33:59,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:33:59,932 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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 10 [2023-11-06 20:33:59,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:33:59,938 INFO L225 Difference]: With dead ends: 143 [2023-11-06 20:33:59,939 INFO L226 Difference]: Without dead ends: 143 [2023-11-06 20:33:59,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-11-06 20:33:59,946 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 66 mSDsluCounter, 391 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 497 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:33:59,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 497 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:33:59,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-11-06 20:33:59,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 120. [2023-11-06 20:33:59,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 73 states have (on average 2.041095890410959) internal successors, (149), 114 states have internal predecessors, (149), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:33:59,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 155 transitions. [2023-11-06 20:33:59,970 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 155 transitions. Word has length 10 [2023-11-06 20:33:59,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:33:59,971 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 155 transitions. [2023-11-06 20:33:59,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 4 states have internal predecessors, (9), 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 20:33:59,971 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 155 transitions. [2023-11-06 20:33:59,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:33:59,972 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:33:59,972 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:33:59,973 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:33:59,973 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:33:59,976 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:33:59,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1010167519, now seen corresponding path program 1 times [2023-11-06 20:33:59,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:33:59,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224374777] [2023-11-06 20:33:59,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:33:59,979 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:00,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:00,173 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 20:34:00,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:00,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224374777] [2023-11-06 20:34:00,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224374777] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:00,175 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:00,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:34:00,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150534876] [2023-11-06 20:34:00,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:00,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:34:00,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:00,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:34:00,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:00,180 INFO L87 Difference]: Start difference. First operand 120 states and 155 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 20:34:00,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:00,338 INFO L93 Difference]: Finished difference Result 119 states and 153 transitions. [2023-11-06 20:34:00,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:34:00,339 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 11 [2023-11-06 20:34:00,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:00,341 INFO L225 Difference]: With dead ends: 119 [2023-11-06 20:34:00,342 INFO L226 Difference]: Without dead ends: 119 [2023-11-06 20:34:00,343 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 20:34:00,351 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 1 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:00,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 145 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:00,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-11-06 20:34:00,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-11-06 20:34:00,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 73 states have (on average 2.0136986301369864) internal successors, (147), 113 states have internal predecessors, (147), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:34:00,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 153 transitions. [2023-11-06 20:34:00,375 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 153 transitions. Word has length 11 [2023-11-06 20:34:00,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:00,376 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 153 transitions. [2023-11-06 20:34:00,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 20:34:00,376 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 153 transitions. [2023-11-06 20:34:00,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-06 20:34:00,378 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:00,379 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:00,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 20:34:00,379 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:00,380 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:00,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1010167520, now seen corresponding path program 1 times [2023-11-06 20:34:00,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:00,380 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311242504] [2023-11-06 20:34:00,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:00,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:00,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:00,482 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 20:34:00,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:00,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311242504] [2023-11-06 20:34:00,483 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311242504] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:00,483 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:00,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:34:00,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016674886] [2023-11-06 20:34:00,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:00,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:34:00,485 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:00,485 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:34:00,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:00,486 INFO L87 Difference]: Start difference. First operand 119 states and 153 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 20:34:00,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:00,593 INFO L93 Difference]: Finished difference Result 118 states and 151 transitions. [2023-11-06 20:34:00,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:34:00,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 11 [2023-11-06 20:34:00,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:00,595 INFO L225 Difference]: With dead ends: 118 [2023-11-06 20:34:00,595 INFO L226 Difference]: Without dead ends: 118 [2023-11-06 20:34:00,595 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 20:34:00,608 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:00,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 140 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:00,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-11-06 20:34:00,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2023-11-06 20:34:00,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 73 states have (on average 1.9863013698630136) internal successors, (145), 112 states have internal predecessors, (145), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:34:00,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 151 transitions. [2023-11-06 20:34:00,629 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 151 transitions. Word has length 11 [2023-11-06 20:34:00,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:00,629 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 151 transitions. [2023-11-06 20:34:00,629 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 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 20:34:00,631 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 151 transitions. [2023-11-06 20:34:00,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 20:34:00,632 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:00,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:00,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 20:34:00,633 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:00,634 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:00,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1504455159, now seen corresponding path program 1 times [2023-11-06 20:34:00,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:00,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541179406] [2023-11-06 20:34:00,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:00,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:00,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:00,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:00,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:00,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541179406] [2023-11-06 20:34:00,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541179406] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:00,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269961035] [2023-11-06 20:34:00,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:00,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:00,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:00,837 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:00,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:34:00,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:00,962 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-06 20:34:00,968 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:01,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:01,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:01,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:01,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269961035] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:34:01,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405668757] [2023-11-06 20:34:01,205 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-06 20:34:01,205 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:01,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:01,218 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:01,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:01,948 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 28 for LOIs [2023-11-06 20:34:02,003 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:02,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1405668757] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:02,454 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:34:02,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [6, 3, 3] total 17 [2023-11-06 20:34:02,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059453403] [2023-11-06 20:34:02,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:02,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 20:34:02,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:02,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 20:34:02,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:34:02,456 INFO L87 Difference]: Start difference. First operand 118 states and 151 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 20:34:02,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:02,911 INFO L93 Difference]: Finished difference Result 135 states and 171 transitions. [2023-11-06 20:34:02,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:34:02,911 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 12 [2023-11-06 20:34:02,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:02,913 INFO L225 Difference]: With dead ends: 135 [2023-11-06 20:34:02,913 INFO L226 Difference]: Without dead ends: 135 [2023-11-06 20:34:02,913 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:34:02,914 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 69 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:02,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 216 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:34:02,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-11-06 20:34:02,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 122. [2023-11-06 20:34:02,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 77 states have (on average 1.9350649350649352) internal successors, (149), 115 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:34:02,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 155 transitions. [2023-11-06 20:34:02,924 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 155 transitions. Word has length 12 [2023-11-06 20:34:02,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:02,925 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 155 transitions. [2023-11-06 20:34:02,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 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 20:34:02,930 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 155 transitions. [2023-11-06 20:34:02,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-06 20:34:02,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:02,932 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:02,940 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-06 20:34:03,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:03,140 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:03,141 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:03,141 INFO L85 PathProgramCache]: Analyzing trace with hash -108128078, now seen corresponding path program 1 times [2023-11-06 20:34:03,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:03,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960413493] [2023-11-06 20:34:03,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:03,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:03,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:03,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:03,281 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:03,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960413493] [2023-11-06 20:34:03,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960413493] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:03,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225211681] [2023-11-06 20:34:03,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:03,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:03,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:03,284 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:03,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:34:03,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:03,393 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:34:03,395 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:03,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:03,438 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:03,510 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:03,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225211681] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:34:03,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689171759] [2023-11-06 20:34:03,514 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-06 20:34:03,514 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:03,514 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:03,515 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:03,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:03,637 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 77 for LOIs [2023-11-06 20:34:05,003 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:06,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1490#(and (= |sll_append_node_create_with_sublist_#t~ret6#1.offset| 0) (= 3 |sll_append_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |sll_append_node_create_with_sublist_~new_node~0#1.base|) 1)) (= 3 |sll_append_#in~sublist_length#1|) (= 3 |sll_append_node_create_with_sublist_~sublist_length#1|) (<= 2 |sll_append_#in~head#1.base|) (= |sll_append_#in~head#1.offset| 0) (= 3 |sll_append_~sublist_length#1|) (= |sll_append_~head#1.offset| 0) (= |sll_append_sll_create_#res#1.base| |sll_append_node_create_with_sublist_#t~ret6#1.base|) (= |sll_append_sll_create_#res#1.offset| 0) (<= 2 |sll_append_~head#1.base|) (= |sll_append_node_create_with_sublist_~new_node~0#1.offset| 0))' at error location [2023-11-06 20:34:06,215 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:34:06,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:34:06,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-06 20:34:06,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1257523705] [2023-11-06 20:34:06,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:34:06,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-06 20:34:06,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:06,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-06 20:34:06,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2023-11-06 20:34:06,218 INFO L87 Difference]: Start difference. First operand 122 states and 155 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:34:06,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:06,606 INFO L93 Difference]: Finished difference Result 216 states and 258 transitions. [2023-11-06 20:34:06,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-06 20:34:06,607 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-06 20:34:06,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:06,609 INFO L225 Difference]: With dead ends: 216 [2023-11-06 20:34:06,609 INFO L226 Difference]: Without dead ends: 216 [2023-11-06 20:34:06,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=133, Invalid=517, Unknown=0, NotChecked=0, Total=650 [2023-11-06 20:34:06,610 INFO L413 NwaCegarLoop]: 139 mSDtfsCounter, 167 mSDsluCounter, 884 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 1023 SdHoareTripleChecker+Invalid, 420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:06,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 1023 Invalid, 420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 414 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 20:34:06,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2023-11-06 20:34:06,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 121. [2023-11-06 20:34:06,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 77 states have (on average 1.922077922077922) internal successors, (148), 116 states have internal predecessors, (148), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-06 20:34:06,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 152 transitions. [2023-11-06 20:34:06,624 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 152 transitions. Word has length 13 [2023-11-06 20:34:06,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:06,624 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 152 transitions. [2023-11-06 20:34:06,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 9 states have internal predecessors, (27), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:34:06,624 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 152 transitions. [2023-11-06 20:34:06,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-06 20:34:06,625 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:06,625 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:06,634 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-06 20:34:06,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:34:06,826 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:06,827 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:06,827 INFO L85 PathProgramCache]: Analyzing trace with hash -1501372198, now seen corresponding path program 1 times [2023-11-06 20:34:06,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:06,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570904636] [2023-11-06 20:34:06,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:06,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:06,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:06,913 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:34:06,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:06,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570904636] [2023-11-06 20:34:06,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570904636] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:06,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664830139] [2023-11-06 20:34:06,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:06,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:06,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:06,916 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:06,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:34:07,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:07,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-06 20:34:07,021 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:07,058 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:34:07,058 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:07,079 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:34:07,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [664830139] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:34:07,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149235352] [2023-11-06 20:34:07,083 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 20:34:07,083 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:07,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:07,084 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:07,084 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:07,357 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 28 for LOIs [2023-11-06 20:34:07,932 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:08,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1936#(and (= |sll_append_node_create_with_sublist_#t~ret6#1.offset| 0) (= 3 |sll_append_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |sll_append_node_create_with_sublist_~new_node~0#1.base|) 1)) (= 3 |sll_append_#in~sublist_length#1|) (= 3 |sll_append_node_create_with_sublist_~sublist_length#1|) (<= 2 |sll_append_#in~head#1.base|) (= |sll_append_#in~head#1.offset| 0) (= 3 |sll_append_~sublist_length#1|) (= |sll_append_~head#1.offset| 0) (= |sll_append_sll_create_#res#1.base| |sll_append_node_create_with_sublist_#t~ret6#1.base|) (= |sll_append_sll_create_#res#1.offset| 0) (<= 2 |sll_append_~head#1.base|) (= |sll_append_node_create_with_sublist_~new_node~0#1.offset| 0))' at error location [2023-11-06 20:34:08,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:34:08,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:34:08,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-06 20:34:08,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813644421] [2023-11-06 20:34:08,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:34:08,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:34:08,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:08,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:34:08,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:34:08,571 INFO L87 Difference]: Start difference. First operand 121 states and 152 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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 20:34:08,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:08,693 INFO L93 Difference]: Finished difference Result 169 states and 205 transitions. [2023-11-06 20:34:08,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:34:08,694 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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 15 [2023-11-06 20:34:08,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:08,695 INFO L225 Difference]: With dead ends: 169 [2023-11-06 20:34:08,695 INFO L226 Difference]: Without dead ends: 169 [2023-11-06 20:34:08,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-06 20:34:08,697 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 71 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:08,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 268 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:08,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2023-11-06 20:34:08,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 136. [2023-11-06 20:34:08,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 90 states have (on average 1.8222222222222222) internal successors, (164), 129 states have internal predecessors, (164), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:34:08,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 172 transitions. [2023-11-06 20:34:08,706 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 172 transitions. Word has length 15 [2023-11-06 20:34:08,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:08,707 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 172 transitions. [2023-11-06 20:34:08,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 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 20:34:08,707 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 172 transitions. [2023-11-06 20:34:08,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:34:08,708 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:08,709 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:08,722 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-06 20:34:08,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:08,924 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:08,924 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:08,925 INFO L85 PathProgramCache]: Analyzing trace with hash -807634862, now seen corresponding path program 2 times [2023-11-06 20:34:08,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:08,925 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282162945] [2023-11-06 20:34:08,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:08,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:08,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:09,145 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:34:09,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:09,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282162945] [2023-11-06 20:34:09,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282162945] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:09,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299542511] [2023-11-06 20:34:09,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:34:09,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:09,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:09,148 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:09,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:34:09,265 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 20:34:09,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:34:09,268 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-06 20:34:09,270 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:09,297 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 20:34:09,328 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-06 20:34:09,329 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-06 20:34:09,351 INFO L322 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-06 20:34:09,351 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 20:34:09,404 INFO L322 Elim1Store]: treesize reduction 32, result has 37.3 percent of original size [2023-11-06 20:34:09,405 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 3 case distinctions, treesize of input 19 treesize of output 25 [2023-11-06 20:34:09,452 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:34:09,452 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:09,571 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:34:09,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299542511] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:34:09,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713592313] [2023-11-06 20:34:09,575 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-06 20:34:09,575 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:09,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:09,576 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:09,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:09,664 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 77 for LOIs [2023-11-06 20:34:10,629 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:11,742 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2369#(and (= |sll_append_node_create_with_sublist_#t~ret6#1.offset| 0) (= 3 |sll_append_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |sll_append_node_create_with_sublist_~new_node~0#1.base|) 1)) (= 3 |sll_append_#in~sublist_length#1|) (= 3 |sll_append_node_create_with_sublist_~sublist_length#1|) (<= 2 |sll_append_#in~head#1.base|) (= |sll_append_#in~head#1.offset| 0) (= 3 |sll_append_~sublist_length#1|) (= |sll_append_~head#1.offset| 0) (= |sll_append_sll_create_#res#1.base| |sll_append_node_create_with_sublist_#t~ret6#1.base|) (= |sll_append_sll_create_#res#1.offset| 0) (<= 2 |sll_append_~head#1.base|) (= |sll_append_node_create_with_sublist_~new_node~0#1.offset| 0))' at error location [2023-11-06 20:34:11,742 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:34:11,743 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:34:11,743 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 8 [2023-11-06 20:34:11,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979488362] [2023-11-06 20:34:11,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:34:11,744 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 20:34:11,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:11,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 20:34:11,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2023-11-06 20:34:11,745 INFO L87 Difference]: Start difference. First operand 136 states and 172 transitions. Second operand has 9 states, 8 states have (on average 3.625) internal successors, (29), 9 states have internal predecessors, (29), 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 20:34:11,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:11,978 INFO L93 Difference]: Finished difference Result 136 states and 170 transitions. [2023-11-06 20:34:11,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:34:11,983 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 9 states have internal predecessors, (29), 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 19 [2023-11-06 20:34:11,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:11,984 INFO L225 Difference]: With dead ends: 136 [2023-11-06 20:34:11,984 INFO L226 Difference]: Without dead ends: 136 [2023-11-06 20:34:11,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2023-11-06 20:34:11,986 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 7 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:11,986 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 290 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:34:11,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-11-06 20:34:11,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 134. [2023-11-06 20:34:11,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 90 states have (on average 1.7777777777777777) internal successors, (160), 127 states have internal predecessors, (160), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:34:11,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 168 transitions. [2023-11-06 20:34:11,993 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 168 transitions. Word has length 19 [2023-11-06 20:34:11,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:11,994 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 168 transitions. [2023-11-06 20:34:11,994 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 9 states have internal predecessors, (29), 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 20:34:11,994 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 168 transitions. [2023-11-06 20:34:11,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:34:11,995 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:11,995 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:12,006 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-06 20:34:12,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:12,204 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting sll_appendErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:12,204 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:12,205 INFO L85 PathProgramCache]: Analyzing trace with hash -807634861, now seen corresponding path program 1 times [2023-11-06 20:34:12,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:12,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134744799] [2023-11-06 20:34:12,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:12,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:12,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:12,529 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:34:12,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:12,529 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134744799] [2023-11-06 20:34:12,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134744799] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:12,530 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747982603] [2023-11-06 20:34:12,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:12,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:12,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:12,531 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:12,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:34:12,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:12,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-06 20:34:12,659 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:12,670 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 20:34:12,677 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 20:34:12,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:34:12,717 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 20:34:12,736 INFO L322 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-06 20:34:12,737 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 17 treesize of output 21 [2023-11-06 20:34:12,842 INFO L322 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2023-11-06 20:34:12,842 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 22 treesize of output 33 [2023-11-06 20:34:12,852 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 20:34:12,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:34:12,966 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 3 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 20:34:12,990 INFO L322 Elim1Store]: treesize reduction 12, result has 52.0 percent of original size [2023-11-06 20:34:12,991 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 21 treesize of output 25 [2023-11-06 20:34:13,018 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:13,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:13,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747982603] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:34:13,618 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785489875] [2023-11-06 20:34:13,620 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-06 20:34:13,620 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:13,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:13,621 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:13,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:13,718 INFO L197 IcfgInterpreter]: Interpreting procedure sll_append with input of size 77 for LOIs [2023-11-06 20:34:14,553 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:15,548 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2772#(and (= |sll_append_node_create_with_sublist_#t~ret6#1.offset| 0) (= 3 |sll_append_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |sll_append_#in~sublist_length#1|) (= 3 |sll_append_node_create_with_sublist_~sublist_length#1|) (<= 2 |sll_append_#in~head#1.base|) (= |sll_append_#in~head#1.offset| 0) (= 3 |sll_append_~sublist_length#1|) (= |sll_append_~head#1.offset| 0) (<= (select |#length| |sll_append_node_create_with_sublist_~new_node~0#1.base|) 7) (= |sll_append_sll_create_#res#1.base| |sll_append_node_create_with_sublist_#t~ret6#1.base|) (= |sll_append_sll_create_#res#1.offset| 0) (<= 2 |sll_append_~head#1.base|) (= |sll_append_node_create_with_sublist_~new_node~0#1.offset| 0))' at error location [2023-11-06 20:34:15,549 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:34:15,549 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:34:15,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 5] total 12 [2023-11-06 20:34:15,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204628580] [2023-11-06 20:34:15,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:34:15,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-06 20:34:15,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:15,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-06 20:34:15,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2023-11-06 20:34:15,551 INFO L87 Difference]: Start difference. First operand 134 states and 168 transitions. Second operand has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 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 20:34:15,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:15,921 INFO L93 Difference]: Finished difference Result 137 states and 170 transitions. [2023-11-06 20:34:15,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:34:15,921 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 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 19 [2023-11-06 20:34:15,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:15,922 INFO L225 Difference]: With dead ends: 137 [2023-11-06 20:34:15,922 INFO L226 Difference]: Without dead ends: 137 [2023-11-06 20:34:15,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=149, Invalid=553, Unknown=0, NotChecked=0, Total=702 [2023-11-06 20:34:15,924 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 16 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:15,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 177 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:34:15,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-11-06 20:34:15,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 132. [2023-11-06 20:34:15,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 90 states have (on average 1.7333333333333334) internal successors, (156), 125 states have internal predecessors, (156), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:34:15,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 164 transitions. [2023-11-06 20:34:15,929 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 164 transitions. Word has length 19 [2023-11-06 20:34:15,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:15,930 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 164 transitions. [2023-11-06 20:34:15,930 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 13 states have internal predecessors, (43), 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 20:34:15,930 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 164 transitions. [2023-11-06 20:34:15,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-06 20:34:15,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:15,931 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:15,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:34:16,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-06 20:34:16,132 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting sll_appendErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:16,132 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:16,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1252232321, now seen corresponding path program 1 times [2023-11-06 20:34:16,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:16,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622076666] [2023-11-06 20:34:16,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:16,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:16,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:16,210 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:34:16,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:16,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622076666] [2023-11-06 20:34:16,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622076666] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:16,211 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:16,211 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:34:16,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748711437] [2023-11-06 20:34:16,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:16,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 20:34:16,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:16,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 20:34:16,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:34:16,213 INFO L87 Difference]: Start difference. First operand 132 states and 164 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 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 20:34:16,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:16,330 INFO L93 Difference]: Finished difference Result 131 states and 162 transitions. [2023-11-06 20:34:16,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:34:16,331 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 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 21 [2023-11-06 20:34:16,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:16,333 INFO L225 Difference]: With dead ends: 131 [2023-11-06 20:34:16,333 INFO L226 Difference]: Without dead ends: 131 [2023-11-06 20:34:16,333 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:34:16,334 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 27 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:16,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 160 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:16,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-11-06 20:34:16,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2023-11-06 20:34:16,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 90 states have (on average 1.711111111111111) internal successors, (154), 124 states have internal predecessors, (154), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:34:16,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 162 transitions. [2023-11-06 20:34:16,340 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 162 transitions. Word has length 21 [2023-11-06 20:34:16,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:16,341 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 162 transitions. [2023-11-06 20:34:16,341 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 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 20:34:16,341 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 162 transitions. [2023-11-06 20:34:16,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-06 20:34:16,342 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:16,343 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:16,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-06 20:34:16,343 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting sll_appendErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:16,344 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:16,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1252232322, now seen corresponding path program 1 times [2023-11-06 20:34:16,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:16,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692500970] [2023-11-06 20:34:16,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:16,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:16,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:16,522 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:34:16,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:16,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692500970] [2023-11-06 20:34:16,523 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692500970] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:16,523 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:16,523 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 20:34:16,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594356877] [2023-11-06 20:34:16,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:16,524 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-06 20:34:16,524 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:16,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-06 20:34:16,525 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:34:16,525 INFO L87 Difference]: Start difference. First operand 131 states and 162 transitions. Second operand has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 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 20:34:16,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:16,654 INFO L93 Difference]: Finished difference Result 130 states and 160 transitions. [2023-11-06 20:34:16,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 20:34:16,654 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 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 21 [2023-11-06 20:34:16,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:16,656 INFO L225 Difference]: With dead ends: 130 [2023-11-06 20:34:16,656 INFO L226 Difference]: Without dead ends: 130 [2023-11-06 20:34:16,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 20:34:16,657 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 26 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:16,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 235 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:16,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-06 20:34:16,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2023-11-06 20:34:16,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 90 states have (on average 1.6888888888888889) internal successors, (152), 123 states have internal predecessors, (152), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:34:16,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 160 transitions. [2023-11-06 20:34:16,662 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 160 transitions. Word has length 21 [2023-11-06 20:34:16,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:16,662 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 160 transitions. [2023-11-06 20:34:16,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.5) internal successors, (14), 5 states have internal predecessors, (14), 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 20:34:16,662 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 160 transitions. [2023-11-06 20:34:16,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 20:34:16,664 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:16,664 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:16,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-06 20:34:16,665 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting sll_appendErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [sll_appendErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, sll_appendErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-06 20:34:16,665 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:16,665 INFO L85 PathProgramCache]: Analyzing trace with hash 164496310, now seen corresponding path program 1 times [2023-11-06 20:34:16,666 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:16,666 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736963492] [2023-11-06 20:34:16,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:16,666 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:16,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:17,080 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:34:17,081 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:17,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736963492] [2023-11-06 20:34:17,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736963492] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:17,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857486393] [2023-11-06 20:34:17,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:17,082 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:17,082 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:17,083 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:17,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7a40960d-b9aa-4a1a-b9dd-a6b0d11d964c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:34:17,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:17,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-06 20:34:17,239 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:17,244 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 20:34:17,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:34:17,282 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 20:34:17,316 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-06 20:34:17,317 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 20:34:17,359 INFO L322 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-06 20:34:17,359 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 20:34:17,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:34:17,394 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 20:34:17,407 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:34:17,407 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:19,485 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_377 Int) (|v_sll_append_sll_create_~new_head~0#1.base_58| Int) (|v_sll_append_sll_create_~new_head~0#1.base_59| Int)) (or (< |c_#StackHeapBarrier| (+ |v_sll_append_sll_create_~new_head~0#1.base_58| 1)) (= (select (store (store |c_#valid| |v_sll_append_sll_create_~new_head~0#1.base_59| 1) |v_sll_append_sll_create_~new_head~0#1.base_58| v_ArrVal_377) |c_sll_append_~head#1.base|) 1))) is different from false [2023-11-06 20:34:21,515 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_377 Int) (|v_sll_append_sll_create_~new_head~0#1.base_60| Int) (|v_sll_append_sll_create_~new_head~0#1.base_58| Int) (|v_sll_append_sll_create_~new_head~0#1.base_59| Int)) (or (< |c_#StackHeapBarrier| (+ |v_sll_append_sll_create_~new_head~0#1.base_58| 1)) (= (select (store (store (store |c_#valid| |v_sll_append_sll_create_~new_head~0#1.base_60| 1) |v_sll_append_sll_create_~new_head~0#1.base_59| 1) |v_sll_append_sll_create_~new_head~0#1.base_58| v_ArrVal_377) |c_sll_append_~head#1.base|) 1))) is different from false [2023-11-06 20:34:23,549 WARN L839 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_377 Int) (v_ArrVal_374 Int) (|v_sll_append_sll_create_~new_head~0#1.base_60| Int) (|v_sll_append_sll_create_~new_head~0#1.base_58| Int) (|v_sll_append_node_create_with_sublist_~new_node~0#1.base_28| Int) (|v_sll_append_sll_create_~new_head~0#1.base_59| Int)) (or (< |c_#StackHeapBarrier| (+ |v_sll_append_node_create_with_sublist_~new_node~0#1.base_28| 1)) (= (select (store (store (store (store |c_#valid| |v_sll_append_node_create_with_sublist_~new_node~0#1.base_28| v_ArrVal_374) |v_sll_append_sll_create_~new_head~0#1.base_60| 1) |v_sll_append_sll_create_~new_head~0#1.base_59| 1) |v_sll_append_sll_create_~new_head~0#1.base_58| v_ArrVal_377) |c_sll_append_#in~head#1.base|) 1) (< |c_#StackHeapBarrier| (+ |v_sll_append_sll_create_~new_head~0#1.base_58| 1)))) is different from false