./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:32:32,604 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:32:32,726 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:32:32,735 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:32:32,736 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:32:32,779 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:32:32,780 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:32:32,780 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:32:32,781 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:32:32,787 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:32:32,788 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:32:32,789 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:32:32,790 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:32:32,792 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:32:32,792 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:32:32,793 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:32:32,793 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:32:32,794 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:32:32,796 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:32:32,796 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:32:32,797 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:32:32,798 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:32:32,798 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:32:32,799 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:32:32,800 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:32:32,801 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:32:32,801 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:32:32,802 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:32:32,802 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:32:32,803 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:32:32,804 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:32:32,804 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:32:32,805 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:32:32,805 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:32:32,805 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:32:32,805 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:32:32,806 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:32:32,806 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:32:32,806 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:32:32,806 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:32:32,807 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:32:32,807 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:32:32,807 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:32:32,808 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:32:32,808 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:32:32,809 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:32:32,809 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:32:32,809 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:32:32,809 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_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2023-11-23 21:32:33,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:32:33,195 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:32:33,199 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:32:33,200 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:32:33,200 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:32:33,202 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2023-11-23 21:32:36,333 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:32:36,614 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:32:36,616 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2023-11-23 21:32:36,637 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/data/cc01468bc/b5294215bf484f0ab09be8f6fa883778/FLAGc1c826967 [2023-11-23 21:32:36,657 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/data/cc01468bc/b5294215bf484f0ab09be8f6fa883778 [2023-11-23 21:32:36,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:32:36,665 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:32:36,667 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:32:36,667 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:32:36,674 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:32:36,674 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:32:36" (1/1) ... [2023-11-23 21:32:36,676 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7625bb17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:36, skipping insertion in model container [2023-11-23 21:32:36,677 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:32:36" (1/1) ... [2023-11-23 21:32:36,758 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:32:37,150 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:32:37,169 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:32:37,272 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:32:37,318 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:32:37,318 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37 WrapperNode [2023-11-23 21:32:37,319 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:32:37,320 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:32:37,320 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:32:37,321 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:32:37,330 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,349 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,388 INFO L138 Inliner]: procedures = 126, calls = 31, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 112 [2023-11-23 21:32:37,389 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:32:37,390 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:32:37,390 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:32:37,390 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:32:37,401 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,402 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,416 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,424 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,433 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,437 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,439 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,441 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,445 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:32:37,446 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:32:37,446 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:32:37,447 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:32:37,448 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (1/1) ... [2023-11-23 21:32:37,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:32:37,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:37,493 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:32:37,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:32:37,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:32:37,552 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:32:37,552 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:32:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:32:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:32:37,553 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:32:37,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:32:37,555 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:32:37,556 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:32:37,556 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:32:37,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:32:37,689 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:32:37,692 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:32:38,040 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:32:38,110 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:32:38,111 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 21:32:38,113 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:32:38 BoogieIcfgContainer [2023-11-23 21:32:38,113 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:32:38,116 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:32:38,116 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:32:38,120 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:32:38,120 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:32:36" (1/3) ... [2023-11-23 21:32:38,121 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f86efaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:32:38, skipping insertion in model container [2023-11-23 21:32:38,121 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:37" (2/3) ... [2023-11-23 21:32:38,122 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f86efaf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:32:38, skipping insertion in model container [2023-11-23 21:32:38,122 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:32:38" (3/3) ... [2023-11-23 21:32:38,123 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2023-11-23 21:32:38,164 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:32:38,165 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2023-11-23 21:32:38,242 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:32:38,253 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;@39e08cb6, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:32:38,253 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2023-11-23 21:32:38,257 INFO L276 IsEmpty]: Start isEmpty. Operand has 64 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:38,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:32:38,263 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:38,264 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:32:38,264 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:38,270 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:38,271 INFO L85 PathProgramCache]: Analyzing trace with hash 5148869, now seen corresponding path program 1 times [2023-11-23 21:32:38,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:38,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372132264] [2023-11-23 21:32:38,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:38,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:38,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:38,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:38,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:38,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372132264] [2023-11-23 21:32:38,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372132264] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:38,560 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:38,561 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:32:38,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904408176] [2023-11-23 21:32:38,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:38,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:32:38,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:38,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:32:38,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:32:38,631 INFO L87 Difference]: Start difference. First operand has 64 states, 31 states have (on average 2.2903225806451615) internal successors, (71), 63 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:38,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:38,721 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2023-11-23 21:32:38,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:32:38,724 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:32:38,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:38,736 INFO L225 Difference]: With dead ends: 75 [2023-11-23 21:32:38,736 INFO L226 Difference]: Without dead ends: 72 [2023-11-23 21:32:38,738 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 [2023-11-23 21:32:38,745 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 12 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:38,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:38,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-23 21:32:38,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2023-11-23 21:32:38,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 61 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:38,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2023-11-23 21:32:38,800 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 4 [2023-11-23 21:32:38,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:38,800 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2023-11-23 21:32:38,801 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:38,801 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2023-11-23 21:32:38,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:32:38,802 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:38,802 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:32:38,802 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:32:38,803 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:38,804 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:38,805 INFO L85 PathProgramCache]: Analyzing trace with hash 5015013, now seen corresponding path program 1 times [2023-11-23 21:32:38,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:38,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465339001] [2023-11-23 21:32:38,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:38,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:38,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:38,918 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:38,919 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:38,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465339001] [2023-11-23 21:32:38,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465339001] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:38,919 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:38,920 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:32:38,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507385137] [2023-11-23 21:32:38,920 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:38,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:32:38,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:38,927 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:32:38,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:32:38,928 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:39,054 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-11-23 21:32:39,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:32:39,055 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:32:39,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:39,061 INFO L225 Difference]: With dead ends: 60 [2023-11-23 21:32:39,062 INFO L226 Difference]: Without dead ends: 60 [2023-11-23 21:32:39,064 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 [2023-11-23 21:32:39,068 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 3 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:39,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 74 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:39,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-23 21:32:39,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-11-23 21:32:39,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 30 states have (on average 2.1) internal successors, (63), 59 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2023-11-23 21:32:39,078 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 4 [2023-11-23 21:32:39,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:39,078 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2023-11-23 21:32:39,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,079 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2023-11-23 21:32:39,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:32:39,079 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:39,080 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:32:39,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:32:39,080 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:39,081 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:39,081 INFO L85 PathProgramCache]: Analyzing trace with hash 5015014, now seen corresponding path program 1 times [2023-11-23 21:32:39,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:39,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861271251] [2023-11-23 21:32:39,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:39,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:39,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:39,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:39,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:39,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861271251] [2023-11-23 21:32:39,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861271251] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:39,239 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:39,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:32:39,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210819262] [2023-11-23 21:32:39,240 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:39,240 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:32:39,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:39,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:32:39,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:32:39,242 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:39,295 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2023-11-23 21:32:39,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:32:39,296 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:32:39,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:39,297 INFO L225 Difference]: With dead ends: 58 [2023-11-23 21:32:39,297 INFO L226 Difference]: Without dead ends: 58 [2023-11-23 21:32:39,298 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 [2023-11-23 21:32:39,299 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 1 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:39,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 80 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:39,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-23 21:32:39,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-11-23 21:32:39,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 30 states have (on average 2.033333333333333) internal successors, (61), 57 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2023-11-23 21:32:39,307 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 4 [2023-11-23 21:32:39,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:39,307 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2023-11-23 21:32:39,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,308 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2023-11-23 21:32:39,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:32:39,308 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:39,309 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:32:39,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:32:39,309 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:39,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:39,310 INFO L85 PathProgramCache]: Analyzing trace with hash 524463697, now seen corresponding path program 1 times [2023-11-23 21:32:39,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:39,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1228482042] [2023-11-23 21:32:39,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:39,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:39,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:39,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:39,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:39,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1228482042] [2023-11-23 21:32:39,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1228482042] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:39,392 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:39,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:32:39,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504980597] [2023-11-23 21:32:39,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:39,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:32:39,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:39,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:32:39,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:32:39,394 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:39,490 INFO L93 Difference]: Finished difference Result 60 states and 63 transitions. [2023-11-23 21:32:39,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:32:39,491 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:32:39,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:39,492 INFO L225 Difference]: With dead ends: 60 [2023-11-23 21:32:39,492 INFO L226 Difference]: Without dead ends: 60 [2023-11-23 21:32:39,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:39,494 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:39,495 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 95 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:39,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-23 21:32:39,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 57. [2023-11-23 21:32:39,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 30 states have (on average 2.0) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2023-11-23 21:32:39,501 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 6 [2023-11-23 21:32:39,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:39,501 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2023-11-23 21:32:39,502 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,502 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2023-11-23 21:32:39,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:32:39,502 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:39,503 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:32:39,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:32:39,503 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:39,504 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:39,504 INFO L85 PathProgramCache]: Analyzing trace with hash 524463698, now seen corresponding path program 1 times [2023-11-23 21:32:39,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:39,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279236991] [2023-11-23 21:32:39,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:39,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:39,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:39,645 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:39,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:39,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279236991] [2023-11-23 21:32:39,646 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279236991] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:39,646 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:39,646 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:32:39,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124088873] [2023-11-23 21:32:39,647 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:39,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:39,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:39,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:39,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:39,648 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:39,722 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2023-11-23 21:32:39,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:32:39,723 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:32:39,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:39,724 INFO L225 Difference]: With dead ends: 59 [2023-11-23 21:32:39,724 INFO L226 Difference]: Without dead ends: 59 [2023-11-23 21:32:39,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:32:39,725 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 4 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:39,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 123 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:39,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-23 21:32:39,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2023-11-23 21:32:39,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 55 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2023-11-23 21:32:39,731 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 6 [2023-11-23 21:32:39,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:39,732 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2023-11-23 21:32:39,732 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:39,732 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2023-11-23 21:32:39,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:32:39,733 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:39,733 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:39,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:32:39,733 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:32:39,734 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:39,734 INFO L85 PathProgramCache]: Analyzing trace with hash -789544948, now seen corresponding path program 1 times [2023-11-23 21:32:39,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:39,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745687509] [2023-11-23 21:32:39,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:39,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:39,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:39,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:39,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:39,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745687509] [2023-11-23 21:32:39,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745687509] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:39,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353999937] [2023-11-23 21:32:39,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:39,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:39,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:39,856 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:39,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:32:39,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:39,976 INFO L262 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:32:39,981 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:40,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:40,041 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:40,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:40,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353999937] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:40,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986218980] [2023-11-23 21:32:40,095 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-23 21:32:40,101 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:40,108 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:40,114 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:40,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:42,672 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:58,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [986218980] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:58,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:32:58,053 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-11-23 21:32:58,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671227045] [2023-11-23 21:32:58,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:58,055 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:32:58,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:58,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:32:58,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=79, Unknown=4, NotChecked=0, Total=110 [2023-11-23 21:32:58,056 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:00,452 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-23 21:33:05,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:33:05,294 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2023-11-23 21:33:05,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:33:05,295 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:33:05,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:33:05,296 INFO L225 Difference]: With dead ends: 86 [2023-11-23 21:33:05,296 INFO L226 Difference]: Without dead ends: 86 [2023-11-23 21:33:05,297 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=27, Invalid=79, Unknown=4, NotChecked=0, Total=110 [2023-11-23 21:33:05,298 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 31 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:33:05,298 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 82 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 312 Invalid, 3 Unknown, 0 Unchecked, 7.2s Time] [2023-11-23 21:33:05,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2023-11-23 21:33:05,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 57. [2023-11-23 21:33:05,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 31 states have (on average 1.935483870967742) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:05,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2023-11-23 21:33:05,304 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 9 [2023-11-23 21:33:05,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:33:05,304 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2023-11-23 21:33:05,304 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:05,304 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2023-11-23 21:33:05,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:33:05,305 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:33:05,305 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:33:05,333 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:33:05,505 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:33:05,506 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:33:05,506 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:33:05,506 INFO L85 PathProgramCache]: Analyzing trace with hash -789548110, now seen corresponding path program 1 times [2023-11-23 21:33:05,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:33:05,506 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030513778] [2023-11-23 21:33:05,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:33:05,507 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:33:05,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:33:05,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:05,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:33:05,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030513778] [2023-11-23 21:33:05,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030513778] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:33:05,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946120021] [2023-11-23 21:33:05,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:33:05,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:33:05,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:33:05,592 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:33:05,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:33:05,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:33:05,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:33:05,698 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:33:05,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:05,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:33:05,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:05,742 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946120021] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:33:05,742 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873452415] [2023-11-23 21:33:05,748 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-23 21:33:05,748 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:33:05,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:33:05,749 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:33:05,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:33:07,311 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:33:24,495 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [873452415] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:33:24,496 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:33:24,496 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 11 [2023-11-23 21:33:24,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158628698] [2023-11-23 21:33:24,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:33:24,497 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:33:24,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:33:24,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:33:24,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=97, Unknown=5, NotChecked=0, Total=132 [2023-11-23 21:33:24,500 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:26,970 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-23 21:33:32,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:33:32,978 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2023-11-23 21:33:32,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:33:32,979 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:33:32,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:33:32,980 INFO L225 Difference]: With dead ends: 80 [2023-11-23 21:33:32,980 INFO L226 Difference]: Without dead ends: 80 [2023-11-23 21:33:32,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 17.2s TimeCoverageRelationStatistics Valid=30, Invalid=97, Unknown=5, NotChecked=0, Total=132 [2023-11-23 21:33:32,983 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 47 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 5 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:33:32,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 88 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 307 Invalid, 3 Unknown, 0 Unchecked, 8.5s Time] [2023-11-23 21:33:32,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-23 21:33:32,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 62. [2023-11-23 21:33:32,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 36 states have (on average 1.8888888888888888) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:32,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-11-23 21:33:33,001 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 9 [2023-11-23 21:33:33,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:33:33,002 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-11-23 21:33:33,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:33:33,002 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-11-23 21:33:33,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:33:33,003 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:33:33,003 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:33:33,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:33:33,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:33:33,220 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2023-11-23 21:33:33,220 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:33:33,221 INFO L85 PathProgramCache]: Analyzing trace with hash 1293812386, now seen corresponding path program 1 times [2023-11-23 21:33:33,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:33:33,221 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905447731] [2023-11-23 21:33:33,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:33:33,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:33:33,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:33:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:33,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:33:33,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905447731] [2023-11-23 21:33:33,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905447731] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:33:33,338 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064150250] [2023-11-23 21:33:33,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:33:33,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:33:33,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:33:33,340 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:33:33,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349a7c33-69e4-445e-80cd-d0dd2142ea49/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:33:33,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:33:33,465 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:33:33,466 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:33:33,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:33,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:33:33,531 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:33:33,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064150250] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:33:33,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1758977936] [2023-11-23 21:33:33,534 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:33:33,534 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:33:33,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:33:33,534 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:33:33,534 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:33:35,264 INFO L180 IcfgInterpreter]: Interpretation finished