./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/dll2n_insert_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/dll2n_insert_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --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 93d1510274ba16ddd1276e8e93ff0a644bf6fb4a262c4c9dde32fe8591d5ce8c --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:19:26,543 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:19:26,664 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:19:26,675 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:19:26,676 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:19:26,715 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:19:26,716 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:19:26,717 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:19:26,718 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:19:26,725 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:19:26,725 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:19:26,726 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:19:26,726 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:19:26,728 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:19:26,728 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:19:26,729 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:19:26,729 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:19:26,729 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:19:26,730 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:19:26,731 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:19:26,731 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:19:26,731 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:19:26,733 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:19:26,733 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:19:26,733 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:19:26,734 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:19:26,734 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:19:26,735 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:19:26,735 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:19:26,735 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:19:26,737 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:19:26,737 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:19:26,737 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:19:26,737 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:19:26,738 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:19:26,738 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:19:26,738 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:19:26,738 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:26,739 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:19:26,739 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:19:26,739 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:19:26,740 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:19:26,740 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:19:26,740 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:19:26,741 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:19:26,741 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:19:26,741 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:19:26,741 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_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93d1510274ba16ddd1276e8e93ff0a644bf6fb4a262c4c9dde32fe8591d5ce8c [2023-11-23 21:19:27,025 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:19:27,069 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:19:27,072 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:19:27,074 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:19:27,075 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:19:27,076 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/dll2n_insert_equal.i [2023-11-23 21:19:30,454 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:19:30,774 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:19:30,777 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/sv-benchmarks/c/list-simple/dll2n_insert_equal.i [2023-11-23 21:19:30,799 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/data/c466b672f/7f6fddf9bbb746399da3fbe38750dca3/FLAGfa20be43c [2023-11-23 21:19:30,821 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/data/c466b672f/7f6fddf9bbb746399da3fbe38750dca3 [2023-11-23 21:19:30,827 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:19:30,829 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:19:30,831 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:30,831 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:19:30,837 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:19:30,838 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,839 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54688fe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30, skipping insertion in model container [2023-11-23 21:19:30,839 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,901 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:19:31,365 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_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/sv-benchmarks/c/list-simple/dll2n_insert_equal.i[24706,24719] [2023-11-23 21:19:31,372 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:31,383 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:19:31,466 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_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/sv-benchmarks/c/list-simple/dll2n_insert_equal.i[24706,24719] [2023-11-23 21:19:31,467 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:31,507 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:19:31,508 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31 WrapperNode [2023-11-23 21:19:31,508 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:31,509 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:31,510 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:19:31,510 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:19:31,518 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,533 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,562 INFO L138 Inliner]: procedures = 127, calls = 44, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 138 [2023-11-23 21:19:31,562 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:31,563 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:19:31,563 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:19:31,563 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:19:31,576 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,577 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,594 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,594 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,604 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,609 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,618 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,620 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,632 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:19:31,633 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:19:31,634 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:19:31,634 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:19:31,635 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (1/1) ... [2023-11-23 21:19:31,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:31,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:31,670 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:19:31,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:19:31,707 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-23 21:19:31,707 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-23 21:19:31,708 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:19:31,708 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:19:31,708 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:19:31,708 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:19:31,708 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:19:31,709 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:19:31,710 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:19:31,842 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:19:31,844 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:19:31,884 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-23 21:19:32,179 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:19:32,404 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:19:32,404 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:19:32,409 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:32 BoogieIcfgContainer [2023-11-23 21:19:32,409 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:19:32,419 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:19:32,419 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:19:32,423 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:19:32,423 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:19:30" (1/3) ... [2023-11-23 21:19:32,424 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e78728a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:32, skipping insertion in model container [2023-11-23 21:19:32,424 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:31" (2/3) ... [2023-11-23 21:19:32,424 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e78728a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:32, skipping insertion in model container [2023-11-23 21:19:32,424 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:32" (3/3) ... [2023-11-23 21:19:32,426 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_insert_equal.i [2023-11-23 21:19:32,446 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:19:32,446 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:19:32,507 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:19:32,518 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=LoopHeads, 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;@674ca84e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:19:32,519 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:19:32,524 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:32,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:19:32,533 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:32,534 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:32,535 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:32,543 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:32,543 INFO L85 PathProgramCache]: Analyzing trace with hash -2125079006, now seen corresponding path program 1 times [2023-11-23 21:19:32,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:32,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1140236572] [2023-11-23 21:19:32,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:32,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:32,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:33,187 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:33,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:33,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1140236572] [2023-11-23 21:19:33,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1140236572] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:33,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:33,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:33,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387610262] [2023-11-23 21:19:33,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:33,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:33,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:33,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:33,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:33,235 INFO L87 Difference]: Start difference. First operand has 19 states, 15 states have (on average 1.6) internal successors, (24), 17 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:33,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:33,876 INFO L93 Difference]: Finished difference Result 37 states and 51 transitions. [2023-11-23 21:19:33,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:33,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:19:33,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:33,885 INFO L225 Difference]: With dead ends: 37 [2023-11-23 21:19:33,886 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 21:19:33,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:33,893 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 3 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:33,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 30 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:19:33,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 21:19:33,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2023-11-23 21:19:33,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:33,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-23 21:19:33,928 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2023-11-23 21:19:33,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:33,929 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-23 21:19:33,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:33,929 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-23 21:19:33,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:19:33,930 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:33,930 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:33,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:19:33,931 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:33,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:33,932 INFO L85 PathProgramCache]: Analyzing trace with hash -176029679, now seen corresponding path program 1 times [2023-11-23 21:19:33,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:33,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662222969] [2023-11-23 21:19:33,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:33,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:33,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:34,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:34,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662222969] [2023-11-23 21:19:34,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662222969] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:34,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646699894] [2023-11-23 21:19:34,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:34,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:34,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:34,140 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:34,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:19:34,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:34,372 INFO L262 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:19:34,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:34,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:34,432 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:34,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:19:34,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646699894] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:34,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [810064990] [2023-11-23 21:19:34,492 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:34,492 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:34,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:34,502 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:34,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:35,893 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:36,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [810064990] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:36,545 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:36,545 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 3] total 8 [2023-11-23 21:19:36,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296191486] [2023-11-23 21:19:36,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:36,547 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:19:36,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:36,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:19:36,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:19:36,549 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:37,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:37,986 INFO L93 Difference]: Finished difference Result 19 states and 24 transitions. [2023-11-23 21:19:37,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:19:37,987 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:19:37,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:37,988 INFO L225 Difference]: With dead ends: 19 [2023-11-23 21:19:37,988 INFO L226 Difference]: Without dead ends: 14 [2023-11-23 21:19:37,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:19:37,990 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:37,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-11-23 21:19:37,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-23 21:19:37,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-23 21:19:38,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:38,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-23 21:19:38,002 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 11 [2023-11-23 21:19:38,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:38,002 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-23 21:19:38,003 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:38,004 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-23 21:19:38,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:19:38,009 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:38,009 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:38,033 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:19:38,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:38,231 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:38,232 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:38,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1241017517, now seen corresponding path program 1 times [2023-11-23 21:19:38,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:38,232 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256506494] [2023-11-23 21:19:38,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:38,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:38,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:38,414 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:19:38,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:38,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256506494] [2023-11-23 21:19:38,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256506494] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:38,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367289871] [2023-11-23 21:19:38,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:38,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:38,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:38,417 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:38,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f39fcee7-fe1d-4fff-a32b-a394d342fb8e/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:19:38,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:38,615 INFO L262 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:19:38,619 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:38,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:19:38,639 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:38,675 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:19:38,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367289871] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:38,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418577985] [2023-11-23 21:19:38,679 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:19:38,679 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:38,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:38,680 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:38,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:40,732 INFO L180 IcfgInterpreter]: Interpretation finished