./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability 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_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/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_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/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 ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5bf92ba2f935aadbe2c0ae3d366f72b4144ff6b8b5ce7c503e628d249b478be5 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:28:02,367 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:28:02,493 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:28:02,506 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:28:02,508 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:28:02,553 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:28:02,554 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:28:02,555 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:28:02,556 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:28:02,556 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:28:02,557 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:28:02,558 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:28:02,558 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:28:02,559 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:28:02,559 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:28:02,560 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:28:02,561 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:28:02,561 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:28:02,562 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:28:02,563 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:28:02,563 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:28:02,564 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:28:02,565 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:28:02,566 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:28:02,566 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:28:02,567 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:28:02,568 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:28:02,568 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:28:02,569 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:28:02,569 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:28:02,570 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:28:02,570 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:28:02,571 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:28:02,571 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:28:02,572 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:28:02,573 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:28:02,573 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:28:02,574 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:28:02,574 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:28:02,574 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:28:02,574 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:28:02,575 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:28:02,575 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:28:02,575 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:28:02,575 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:28:02,576 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5bf92ba2f935aadbe2c0ae3d366f72b4144ff6b8b5ce7c503e628d249b478be5 [2023-11-06 20:28:02,819 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:28:02,844 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:28:02,847 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:28:02,849 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:28:02,850 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:28:02,851 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i [2023-11-06 20:28:06,023 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:28:06,385 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:28:06,386 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i [2023-11-06 20:28:06,401 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/data/0b7cb2b13/28a2265aa4ae4c20bf9d21fd74c0a7fb/FLAG0f1cd635d [2023-11-06 20:28:06,415 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/data/0b7cb2b13/28a2265aa4ae4c20bf9d21fd74c0a7fb [2023-11-06 20:28:06,418 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:28:06,420 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:28:06,421 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:28:06,422 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:28:06,433 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:28:06,436 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:28:06" (1/1) ... [2023-11-06 20:28:06,438 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c5eb5dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:06, skipping insertion in model container [2023-11-06 20:28:06,438 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:28:06" (1/1) ... [2023-11-06 20:28:06,508 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:28:06,898 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i[24494,24507] [2023-11-06 20:28:06,913 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:28:06,927 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:28:06,985 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/sv-benchmarks/c/list-ext3-properties/sll_nondet_insert-2.i[24494,24507] [2023-11-06 20:28:06,986 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:28:07,023 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:28:07,024 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07 WrapperNode [2023-11-06 20:28:07,024 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:28:07,026 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:28:07,026 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:28:07,026 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:28:07,035 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,063 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,106 INFO L138 Inliner]: procedures = 129, calls = 33, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 131 [2023-11-06 20:28:07,107 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:28:07,107 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:28:07,108 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:28:07,108 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:28:07,119 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,120 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,130 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,130 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,144 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,161 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,163 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,165 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,169 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:28:07,176 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:28:07,176 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:28:07,176 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:28:07,178 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (1/1) ... [2023-11-06 20:28:07,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:28:07,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:07,215 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:28:07,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:28:07,264 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-06 20:28:07,265 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-06 20:28:07,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 20:28:07,265 INFO L130 BoogieDeclarations]: Found specification of procedure _get_nondet_int [2023-11-06 20:28:07,265 INFO L138 BoogieDeclarations]: Found implementation of procedure _get_nondet_int [2023-11-06 20:28:07,266 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:28:07,268 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:28:07,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 20:28:07,269 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 20:28:07,269 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:28:07,269 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-06 20:28:07,270 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:28:07,270 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:28:07,270 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:28:07,452 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:28:07,465 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:28:07,515 INFO L771 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-06 20:28:07,811 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:28:07,894 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:28:07,894 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-06 20:28:07,897 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:28:07 BoogieIcfgContainer [2023-11-06 20:28:07,897 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:28:07,900 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:28:07,900 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:28:07,904 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:28:07,905 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:28:06" (1/3) ... [2023-11-06 20:28:07,906 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41b3594c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:28:07, skipping insertion in model container [2023-11-06 20:28:07,906 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:28:07" (2/3) ... [2023-11-06 20:28:07,906 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41b3594c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:28:07, skipping insertion in model container [2023-11-06 20:28:07,907 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:28:07" (3/3) ... [2023-11-06 20:28:07,908 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_nondet_insert-2.i [2023-11-06 20:28:07,931 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:28:07,931 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:28:07,990 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:28:07,998 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=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, 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;@21ec128b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:28:07,999 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:28:08,004 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:28:08,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:28:08,014 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:08,015 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:08,016 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:08,023 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:08,023 INFO L85 PathProgramCache]: Analyzing trace with hash -523683457, now seen corresponding path program 1 times [2023-11-06 20:28:08,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:08,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154944316] [2023-11-06 20:28:08,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:08,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:08,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:08,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:28:08,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:08,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154944316] [2023-11-06 20:28:08,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154944316] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:08,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804358160] [2023-11-06 20:28:08,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:08,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:08,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:08,257 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:08,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:28:08,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:08,418 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-06 20:28:08,425 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:08,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:28:08,455 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:28:08,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804358160] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:28:08,457 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:28:08,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2023-11-06 20:28:08,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523877146] [2023-11-06 20:28:08,461 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:28:08,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-06 20:28:08,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:08,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-06 20:28:08,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 20:28:08,517 INFO L87 Difference]: Start difference. First operand has 34 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-06 20:28:08,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:08,565 INFO L93 Difference]: Finished difference Result 66 states and 94 transitions. [2023-11-06 20:28:08,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-06 20:28:08,568 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2023-11-06 20:28:08,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:08,577 INFO L225 Difference]: With dead ends: 66 [2023-11-06 20:28:08,577 INFO L226 Difference]: Without dead ends: 27 [2023-11-06 20:28:08,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-06 20:28:08,585 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:08,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:28:08,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-06 20:28:08,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-06 20:28:08,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:28:08,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2023-11-06 20:28:08,630 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 19 [2023-11-06 20:28:08,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:08,630 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2023-11-06 20:28:08,630 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-06 20:28:08,631 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2023-11-06 20:28:08,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-06 20:28:08,633 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:08,633 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:08,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:28:08,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-06 20:28:08,840 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:08,841 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:08,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1462078373, now seen corresponding path program 1 times [2023-11-06 20:28:08,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:08,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711582923] [2023-11-06 20:28:08,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:08,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:08,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:09,284 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:28:09,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:09,285 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711582923] [2023-11-06 20:28:09,285 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711582923] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:09,285 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478034610] [2023-11-06 20:28:09,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:09,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:09,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:09,287 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:09,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:28:09,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:09,410 INFO L262 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-06 20:28:09,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:09,532 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:28:09,532 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:28:09,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478034610] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:28:09,533 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:28:09,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-11-06 20:28:09,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609654747] [2023-11-06 20:28:09,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:28:09,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:28:09,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:09,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:28:09,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:28:09,539 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 20:28:09,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:09,708 INFO L93 Difference]: Finished difference Result 49 states and 60 transitions. [2023-11-06 20:28:09,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:28:09,710 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) Word has length 22 [2023-11-06 20:28:09,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:09,712 INFO L225 Difference]: With dead ends: 49 [2023-11-06 20:28:09,712 INFO L226 Difference]: Without dead ends: 29 [2023-11-06 20:28:09,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2023-11-06 20:28:09,715 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 1 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:09,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 104 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:28:09,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-06 20:28:09,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-06 20:28:09,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 24 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:28:09,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-11-06 20:28:09,732 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 22 [2023-11-06 20:28:09,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:09,734 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-11-06 20:28:09,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 20:28:09,735 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-11-06 20:28:09,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-06 20:28:09,736 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:09,736 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:09,753 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:28:09,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:09,943 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:09,943 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:09,944 INFO L85 PathProgramCache]: Analyzing trace with hash -1154701630, now seen corresponding path program 1 times [2023-11-06 20:28:09,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:09,944 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91978998] [2023-11-06 20:28:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:09,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:09,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:10,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:28:10,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:10,254 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91978998] [2023-11-06 20:28:10,254 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91978998] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:28:10,254 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:28:10,254 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 20:28:10,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156844553] [2023-11-06 20:28:10,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:28:10,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:28:10,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:10,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:28:10,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:28:10,257 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 20:28:10,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:10,400 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2023-11-06 20:28:10,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:28:10,401 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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) Word has length 26 [2023-11-06 20:28:10,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:10,404 INFO L225 Difference]: With dead ends: 47 [2023-11-06 20:28:10,404 INFO L226 Difference]: Without dead ends: 44 [2023-11-06 20:28:10,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-06 20:28:10,409 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 15 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:10,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 98 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:28:10,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-06 20:28:10,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 31. [2023-11-06 20:28:10,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 26 states have internal predecessors, (32), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:28:10,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2023-11-06 20:28:10,433 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 26 [2023-11-06 20:28:10,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:10,434 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2023-11-06 20:28:10,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 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 20:28:10,434 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2023-11-06 20:28:10,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 20:28:10,436 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:10,436 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:10,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 20:28:10,437 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:10,438 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:10,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1437635682, now seen corresponding path program 1 times [2023-11-06 20:28:10,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:10,443 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088080359] [2023-11-06 20:28:10,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:10,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:10,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:28:10,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:10,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088080359] [2023-11-06 20:28:10,756 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088080359] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:10,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274636256] [2023-11-06 20:28:10,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:10,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:10,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:10,764 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:10,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:28:10,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:10,877 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-06 20:28:10,880 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:10,973 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:28:10,973 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:28:11,192 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-06 20:28:11,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274636256] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:28:11,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1713271430] [2023-11-06 20:28:11,219 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-06 20:28:11,219 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:28:11,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:28:11,230 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:28:11,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:28:12,690 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 47 for LOIs [2023-11-06 20:28:12,799 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:28:14,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '710#(and (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 (+ |ULTIMATE.start_sll_length_#res#1| 2147483648)) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (exists ((|v_ULTIMATE.start_sll_length_#in~head#1.offset_11| Int) (|v_ULTIMATE.start_main_#t~mem20#1.offset_14| Int)) (and (= |ULTIMATE.start_main_~len~2#1| 2) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_sll_length_#res#1|) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |v_ULTIMATE.start_main_#t~mem20#1.offset_14| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |v_ULTIMATE.start_sll_length_#in~head#1.offset_11| 0))))' at error location [2023-11-06 20:28:14,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:28:14,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:28:14,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 15 [2023-11-06 20:28:14,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011291286] [2023-11-06 20:28:14,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:28:14,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-06 20:28:14,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:14,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-06 20:28:14,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=834, Unknown=0, NotChecked=0, Total=930 [2023-11-06 20:28:14,514 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:28:14,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:14,899 INFO L93 Difference]: Finished difference Result 71 states and 89 transitions. [2023-11-06 20:28:14,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 20:28:14,901 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2023-11-06 20:28:14,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:14,903 INFO L225 Difference]: With dead ends: 71 [2023-11-06 20:28:14,903 INFO L226 Difference]: Without dead ends: 49 [2023-11-06 20:28:14,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=144, Invalid=1188, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 20:28:14,905 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 10 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:14,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 199 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:28:14,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-06 20:28:14,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 35. [2023-11-06 20:28:14,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-06 20:28:14,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2023-11-06 20:28:14,913 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 27 [2023-11-06 20:28:14,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:14,914 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2023-11-06 20:28:14,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 13 states have internal predecessors, (38), 2 states have call successors, (3), 2 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-06 20:28:14,914 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2023-11-06 20:28:14,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-06 20:28:14,915 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:14,915 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:14,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:28:15,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:15,117 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:15,117 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:15,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1028628887, now seen corresponding path program 2 times [2023-11-06 20:28:15,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:15,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285862094] [2023-11-06 20:28:15,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:15,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:15,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:15,430 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:28:15,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:15,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285862094] [2023-11-06 20:28:15,430 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285862094] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:15,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812441223] [2023-11-06 20:28:15,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:28:15,431 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:15,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:15,435 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:15,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:28:15,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-06 20:28:15,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:28:15,554 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-06 20:28:15,557 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:15,620 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-06 20:28:15,772 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-06 20:28:15,819 INFO L322 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-06 20:28:15,819 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 23 [2023-11-06 20:28:15,823 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:28:15,823 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:28:15,847 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2023-11-06 20:28:15,941 INFO L322 Elim1Store]: treesize reduction 11, result has 64.5 percent of original size [2023-11-06 20:28:15,942 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 133 treesize of output 132 [2023-11-06 20:28:15,998 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:28:15,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812441223] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:28:15,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [507948765] [2023-11-06 20:28:16,002 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-06 20:28:16,002 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:28:16,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:28:16,003 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:28:16,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:28:16,863 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 47 for LOIs [2023-11-06 20:28:16,954 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:28:18,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1085#(and (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 (+ |ULTIMATE.start_sll_length_#res#1| 2147483648)) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (exists ((|v_ULTIMATE.start_sll_length_#in~head#1.offset_14| Int) (|v_ULTIMATE.start_main_#t~mem20#1.offset_17| Int)) (and (= |ULTIMATE.start_main_~len~2#1| 2) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_sll_length_#res#1|) (= |v_ULTIMATE.start_main_#t~mem20#1.offset_17| 0) (= |v_ULTIMATE.start_sll_length_#in~head#1.offset_14| 0) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))))' at error location [2023-11-06 20:28:18,536 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:28:18,536 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:28:18,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 8] total 14 [2023-11-06 20:28:18,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544666913] [2023-11-06 20:28:18,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:28:18,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-06 20:28:18,537 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:18,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-06 20:28:18,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=794, Unknown=0, NotChecked=0, Total=870 [2023-11-06 20:28:18,538 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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 20:28:19,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:19,015 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2023-11-06 20:28:19,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-06 20:28:19,015 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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) Word has length 31 [2023-11-06 20:28:19,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:19,016 INFO L225 Difference]: With dead ends: 62 [2023-11-06 20:28:19,017 INFO L226 Difference]: Without dead ends: 59 [2023-11-06 20:28:19,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2023-11-06 20:28:19,019 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 55 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:19,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 239 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-06 20:28:19,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-06 20:28:19,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 42. [2023-11-06 20:28:19,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-06 20:28:19,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2023-11-06 20:28:19,028 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 31 [2023-11-06 20:28:19,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:19,028 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2023-11-06 20:28:19,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 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 20:28:19,029 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2023-11-06 20:28:19,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-06 20:28:19,030 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:19,030 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:19,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:28:19,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:19,236 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:19,236 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:19,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1821100905, now seen corresponding path program 3 times [2023-11-06 20:28:19,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:19,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993850842] [2023-11-06 20:28:19,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:19,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:19,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:19,588 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-06 20:28:19,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:19,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993850842] [2023-11-06 20:28:19,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993850842] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:19,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707026030] [2023-11-06 20:28:19,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:28:19,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:19,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:19,594 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:19,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:28:19,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:28:19,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:28:19,705 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-06 20:28:19,708 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:19,768 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-06 20:28:19,768 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:28:20,023 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-06 20:28:20,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707026030] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:28:20,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336752484] [2023-11-06 20:28:20,026 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-06 20:28:20,026 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:28:20,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:28:20,027 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:28:20,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:28:20,752 INFO L197 IcfgInterpreter]: Interpreting procedure _get_nondet_int with input of size 47 for LOIs [2023-11-06 20:28:20,848 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:28:22,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1473#(and (<= |ULTIMATE.start_sll_length_#res#1| 2147483647) (<= 0 (+ |ULTIMATE.start_sll_length_#res#1| 2147483648)) (not (= (+ |ULTIMATE.start_main_~len~2#1| |ULTIMATE.start_main_~k~0#1|) |ULTIMATE.start_sll_length_#res#1|)) (exists ((|v_ULTIMATE.start_main_#t~mem20#1.offset_20| Int) (|v_ULTIMATE.start_sll_length_#in~head#1.offset_17| Int)) (and (= |ULTIMATE.start_main_~len~2#1| 2) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |v_ULTIMATE.start_main_#t~mem20#1.offset_20| 0) (<= 0 |ULTIMATE.start_sll_length_#res#1|) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |v_ULTIMATE.start_sll_length_#in~head#1.offset_17| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))))' at error location [2023-11-06 20:28:22,491 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:28:22,491 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:28:22,492 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 14] total 22 [2023-11-06 20:28:22,492 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245959564] [2023-11-06 20:28:22,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:28:22,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-06 20:28:22,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:28:22,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-06 20:28:22,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2023-11-06 20:28:22,495 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 20:28:22,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:28:22,998 INFO L93 Difference]: Finished difference Result 110 states and 143 transitions. [2023-11-06 20:28:22,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-06 20:28:23,000 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 32 [2023-11-06 20:28:23,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:28:23,001 INFO L225 Difference]: With dead ends: 110 [2023-11-06 20:28:23,001 INFO L226 Difference]: Without dead ends: 107 [2023-11-06 20:28:23,003 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 71 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2023-11-06 20:28:23,004 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 55 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-06 20:28:23,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 279 Invalid, 423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-06 20:28:23,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-06 20:28:23,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 77. [2023-11-06 20:28:23,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 68 states have internal predecessors, (80), 7 states have call successors, (7), 2 states have call predecessors, (7), 4 states have return successors, (14), 6 states have call predecessors, (14), 7 states have call successors, (14) [2023-11-06 20:28:23,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 101 transitions. [2023-11-06 20:28:23,023 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 101 transitions. Word has length 32 [2023-11-06 20:28:23,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:28:23,024 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 101 transitions. [2023-11-06 20:28:23,024 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 1.736842105263158) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-06 20:28:23,025 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 101 transitions. [2023-11-06 20:28:23,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-06 20:28:23,026 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:28:23,027 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:28:23,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 20:28:23,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:23,238 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:28:23,238 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:28:23,238 INFO L85 PathProgramCache]: Analyzing trace with hash 617929687, now seen corresponding path program 4 times [2023-11-06 20:28:23,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:28:23,238 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233852420] [2023-11-06 20:28:23,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:28:23,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:28:23,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:24,044 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-06 20:28:24,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:28:24,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233852420] [2023-11-06 20:28:24,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233852420] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:28:24,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1383462616] [2023-11-06 20:28:24,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:28:24,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:28:24,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:28:24,047 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:28:24,069 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ec09ab7-d3e2-4a22-be2c-1f49aa06466b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:28:24,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:28:24,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-06 20:28:24,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:28:24,180 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 20:28:24,225 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2023-11-06 20:28:24,246 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 11 treesize of output 7 [2023-11-06 20:28:24,297 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-06 20:28:24,298 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-06 20:28:24,353 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-11-06 20:28:24,359 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2023-11-06 20:28:24,905 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:28:24,905 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:28:25,541 INFO L322 Elim1Store]: treesize reduction 11, result has 81.0 percent of original size [2023-11-06 20:28:25,541 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 1572 treesize of output 1554 [2023-11-06 20:28:30,064 INFO L322 Elim1Store]: treesize reduction 1303, result has 39.2 percent of original size [2023-11-06 20:28:30,066 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 21 select indices, 21 select index equivalence classes, 0 disjoint index pairs (out of 210 index pairs), introduced 24 new quantified variables, introduced 210 case distinctions, treesize of input 8927 treesize of output 8762