./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91 --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 dea78793c7130d873f751539350d9a84f129d659be765f9ed3f85c683976c43a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:48:43,135 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:48:43,256 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:48:43,264 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:48:43,265 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:48:43,304 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:48:43,305 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:48:43,306 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:48:43,307 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:48:43,312 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:48:43,313 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:48:43,313 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:48:43,314 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:48:43,316 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:48:43,316 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:48:43,317 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:48:43,317 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:48:43,318 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:48:43,318 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:48:43,319 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:48:43,319 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:48:43,320 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:48:43,321 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:48:43,322 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:48:43,322 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:48:43,323 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:48:43,323 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:48:43,324 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:48:43,324 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:48:43,325 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:48:43,326 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:48:43,327 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:48:43,327 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:48:43,327 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:48:43,328 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:48:43,328 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:48:43,328 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:48:43,329 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:48:43,329 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:48:43,329 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:48:43,330 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:48:43,330 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:48:43,330 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:48:43,331 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:48:43,331 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:48:43,332 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:48:43,332 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:48:43,332 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_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> dea78793c7130d873f751539350d9a84f129d659be765f9ed3f85c683976c43a [2023-11-24 23:48:43,731 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:48:43,764 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:48:43,767 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:48:43,769 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:48:43,770 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:48:43,771 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c [2023-11-24 23:48:46,805 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:48:47,070 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:48:47,071 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c [2023-11-24 23:48:47,081 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/data/b74a960ad/bbc212e230bc40139c499d52774eae19/FLAG55840cbf4 [2023-11-24 23:48:47,099 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/data/b74a960ad/bbc212e230bc40139c499d52774eae19 [2023-11-24 23:48:47,104 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:48:47,106 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:48:47,109 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:48:47,110 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:48:47,115 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:48:47,116 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,117 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@691bbb63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47, skipping insertion in model container [2023-11-24 23:48:47,118 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,155 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:48:47,410 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_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c[1440,1453] [2023-11-24 23:48:47,434 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:48:47,446 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:48:47,461 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_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/sv-benchmarks/c/recursified_loop-simple/recursified_deep-nested.c[1440,1453] [2023-11-24 23:48:47,478 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:48:47,494 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:48:47,495 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47 WrapperNode [2023-11-24 23:48:47,495 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:48:47,496 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:48:47,497 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:48:47,497 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:48:47,505 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,515 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,535 INFO L138 Inliner]: procedures = 16, calls = 71, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 44 [2023-11-24 23:48:47,536 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:48:47,537 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:48:47,537 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:48:47,537 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:48:47,546 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,546 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,550 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,550 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,574 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,577 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,580 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,581 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,586 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:48:47,587 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:48:47,587 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:48:47,587 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:48:47,588 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (1/1) ... [2023-11-24 23:48:47,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:48:47,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:48:47,623 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:48:47,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:48:47,690 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_12_to_13_0 [2023-11-24 23:48:47,690 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_12_to_13_0 [2023-11-24 23:48:47,690 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:48:47,692 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_13_to_14_0 [2023-11-24 23:48:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_13_to_14_0 [2023-11-24 23:48:47,693 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_11_to_12_0 [2023-11-24 23:48:47,694 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_11_to_12_0 [2023-11-24 23:48:47,695 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:48:47,695 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_14_to_16_0 [2023-11-24 23:48:47,695 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_14_to_16_0 [2023-11-24 23:48:47,696 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_10_to_11_0 [2023-11-24 23:48:47,696 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_10_to_11_0 [2023-11-24 23:48:47,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:48:47,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:48:47,696 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:48:47,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:48:47,697 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:48:47,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:48:47,847 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:48:47,849 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:48:48,277 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:48:48,395 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:48:48,395 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-24 23:48:48,397 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:48:48 BoogieIcfgContainer [2023-11-24 23:48:48,397 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:48:48,400 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:48:48,400 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:48:48,404 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:48:48,404 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:48:47" (1/3) ... [2023-11-24 23:48:48,405 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3376500d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:48:48, skipping insertion in model container [2023-11-24 23:48:48,406 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:48:47" (2/3) ... [2023-11-24 23:48:48,406 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3376500d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:48:48, skipping insertion in model container [2023-11-24 23:48:48,406 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:48:48" (3/3) ... [2023-11-24 23:48:48,408 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_deep-nested.c [2023-11-24 23:48:48,430 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:48:48,430 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:48:48,489 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:48:48,495 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;@4428b31e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:48:48,495 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:48:48,501 INFO L276 IsEmpty]: Start isEmpty. Operand has 41 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 30 states have internal predecessors, (31), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-24 23:48:48,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-24 23:48:48,511 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:48:48,512 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:48:48,514 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION === [func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:48:48,522 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:48:48,522 INFO L85 PathProgramCache]: Analyzing trace with hash -2117252113, now seen corresponding path program 1 times [2023-11-24 23:48:48,536 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:48:48,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555468043] [2023-11-24 23:48:48,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:48:48,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:48:49,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:48:52,292 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:48:52,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:48:52,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555468043] [2023-11-24 23:48:52,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555468043] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:48:52,295 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:48:52,295 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2023-11-24 23:48:52,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984444487] [2023-11-24 23:48:52,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:48:52,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-24 23:48:52,308 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:48:52,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-24 23:48:52,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:48:52,357 INFO L87 Difference]: Start difference. First operand has 41 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 30 states have internal predecessors, (31), 10 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 16 states, 13 states have (on average 1.0) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:48:53,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:48:53,228 INFO L93 Difference]: Finished difference Result 111 states and 154 transitions. [2023-11-24 23:48:53,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-24 23:48:53,231 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 13 states have (on average 1.0) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-24 23:48:53,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:48:53,243 INFO L225 Difference]: With dead ends: 111 [2023-11-24 23:48:53,244 INFO L226 Difference]: Without dead ends: 65 [2023-11-24 23:48:53,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=445, Unknown=0, NotChecked=0, Total=506 [2023-11-24 23:48:53,255 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 25 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-24 23:48:53,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 292 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-24 23:48:53,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-24 23:48:53,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2023-11-24 23:48:53,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 45 states have internal predecessors, (46), 14 states have call successors, (14), 10 states have call predecessors, (14), 8 states have return successors, (16), 8 states have call predecessors, (16), 12 states have call successors, (16) [2023-11-24 23:48:53,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2023-11-24 23:48:53,301 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 18 [2023-11-24 23:48:53,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:48:53,302 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2023-11-24 23:48:53,302 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 13 states have (on average 1.0) internal successors, (13), 10 states have internal predecessors, (13), 5 states have call successors, (5), 5 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:48:53,302 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2023-11-24 23:48:53,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-24 23:48:53,305 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:48:53,305 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:48:53,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:48:53,306 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION === [func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:48:53,306 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:48:53,307 INFO L85 PathProgramCache]: Analyzing trace with hash 200392441, now seen corresponding path program 1 times [2023-11-24 23:48:53,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:48:53,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670062381] [2023-11-24 23:48:53,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:48:53,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:48:53,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:48:55,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:48:55,117 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:48:55,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670062381] [2023-11-24 23:48:55,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670062381] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:48:55,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828972468] [2023-11-24 23:48:55,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:48:55,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:48:55,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:48:55,123 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:48:55,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:48:55,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:48:55,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 142 conjunts are in the unsatisfiable core [2023-11-24 23:48:55,444 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:48:55,555 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:48:55,561 INFO L378 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 2841 treesize of output 2813 [2023-11-24 23:48:56,187 INFO L378 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 11 treesize of output 7 [2023-11-24 23:48:56,373 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-11-24 23:48:56,374 INFO L378 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-11-24 23:48:56,618 INFO L349 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2023-11-24 23:48:56,619 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 28 [2023-11-24 23:48:57,003 INFO L349 Elim1Store]: treesize reduction 37, result has 28.8 percent of original size [2023-11-24 23:48:57,003 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 39 [2023-11-24 23:48:57,581 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-24 23:48:57,582 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 9 case distinctions, treesize of input 131 treesize of output 211 [2023-11-24 23:48:57,679 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:48:57,680 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:49:08,720 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-11-24 23:49:08,721 INFO L378 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 463 treesize of output 446 [2023-11-24 23:49:09,264 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:49:09,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828972468] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:49:09,265 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1165706636] [2023-11-24 23:49:09,285 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-24 23:49:09,285 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:49:09,290 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-24 23:49:09,293 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:49:09,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 18] total 52 [2023-11-24 23:49:09,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694224930] [2023-11-24 23:49:09,294 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:49:09,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-11-24 23:49:09,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:49:09,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-11-24 23:49:09,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=2617, Unknown=3, NotChecked=0, Total=2756 [2023-11-24 23:49:09,299 INFO L87 Difference]: Start difference. First operand 60 states and 76 transitions. Second operand has 53 states, 40 states have (on average 1.175) internal successors, (47), 34 states have internal predecessors, (47), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:49:16,022 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse14 (select |c_#memory_int| c_func_to_recursive_line_14_to_16_0_~e.base)) (.cse3 (select |c_#memory_int| |c_func_to_recursive_line_14_to_16_0_#in~e.base|))) (let ((.cse5 (select .cse3 |c_func_to_recursive_line_14_to_16_0_#in~e.offset|)) (.cse8 (select .cse14 c_func_to_recursive_line_14_to_16_0_~e.offset))) (and (let ((.cse4 (+ .cse5 1))) (let ((.cse2 (mod .cse4 4294967296)) (.cse0 (store |c_#memory_int| |c_func_to_recursive_line_14_to_16_0_#in~e.base| (store .cse3 |c_func_to_recursive_line_14_to_16_0_#in~e.offset| .cse4)))) (or (forall ((func_to_recursive_line_14_to_16_0_~d.base Int) (func_to_recursive_line_14_to_16_0_~d.offset Int)) (let ((.cse1 (mod (select (select .cse0 func_to_recursive_line_14_to_16_0_~d.base) func_to_recursive_line_14_to_16_0_~d.offset) 4294967296))) (or (not (= (mod (select (select .cse0 |c_func_to_recursive_line_14_to_16_0_#in~c.base|) |c_func_to_recursive_line_14_to_16_0_#in~c.offset|) 4294967296) .cse1)) (not (= .cse2 .cse1))))) (forall ((func_to_recursive_line_14_to_16_0_~uint32_max.offset Int) (func_to_recursive_line_14_to_16_0_~uint32_max.base Int)) (not (= .cse2 (mod (+ (select (select .cse0 func_to_recursive_line_14_to_16_0_~uint32_max.base) func_to_recursive_line_14_to_16_0_~uint32_max.offset) 4294967294) 4294967296))))))) (let ((.cse6 (mod .cse8 4294967296))) (or (forall ((func_to_recursive_line_14_to_16_0_~uint32_max.offset Int) (func_to_recursive_line_14_to_16_0_~uint32_max.base Int)) (not (= (mod (+ (select (select |c_#memory_int| func_to_recursive_line_14_to_16_0_~uint32_max.base) func_to_recursive_line_14_to_16_0_~uint32_max.offset) 4294967294) 4294967296) .cse6))) (forall ((func_to_recursive_line_14_to_16_0_~d.base Int) (func_to_recursive_line_14_to_16_0_~d.offset Int)) (let ((.cse7 (mod (select (select |c_#memory_int| func_to_recursive_line_14_to_16_0_~d.base) func_to_recursive_line_14_to_16_0_~d.offset) 4294967296))) (or (not (= (mod (select (select |c_#memory_int| c_func_to_recursive_line_14_to_16_0_~c.base) c_func_to_recursive_line_14_to_16_0_~c.offset) 4294967296) .cse7)) (not (= .cse7 .cse6))))))) (let ((.cse9 (mod .cse5 4294967296))) (or (forall ((func_to_recursive_line_14_to_16_0_~uint32_max.offset Int) (func_to_recursive_line_14_to_16_0_~uint32_max.base Int)) (not (= .cse9 (mod (+ (select (select |c_#memory_int| func_to_recursive_line_14_to_16_0_~uint32_max.base) func_to_recursive_line_14_to_16_0_~uint32_max.offset) 4294967294) 4294967296)))) (forall ((func_to_recursive_line_14_to_16_0_~d.base Int) (func_to_recursive_line_14_to_16_0_~d.offset Int)) (let ((.cse10 (mod (select (select |c_#memory_int| func_to_recursive_line_14_to_16_0_~d.base) func_to_recursive_line_14_to_16_0_~d.offset) 4294967296))) (or (not (= (mod (select (select |c_#memory_int| |c_func_to_recursive_line_14_to_16_0_#in~c.base|) |c_func_to_recursive_line_14_to_16_0_#in~c.offset|) 4294967296) .cse10)) (not (= .cse9 .cse10))))))) (let ((.cse15 (+ .cse8 1))) (let ((.cse11 (mod .cse15 4294967296)) (.cse12 (store |c_#memory_int| c_func_to_recursive_line_14_to_16_0_~e.base (store .cse14 c_func_to_recursive_line_14_to_16_0_~e.offset .cse15)))) (or (forall ((func_to_recursive_line_14_to_16_0_~uint32_max.offset Int) (func_to_recursive_line_14_to_16_0_~uint32_max.base Int)) (not (= .cse11 (mod (+ (select (select .cse12 func_to_recursive_line_14_to_16_0_~uint32_max.base) func_to_recursive_line_14_to_16_0_~uint32_max.offset) 4294967294) 4294967296)))) (forall ((func_to_recursive_line_14_to_16_0_~d.base Int) (func_to_recursive_line_14_to_16_0_~d.offset Int)) (let ((.cse13 (mod (select (select .cse12 func_to_recursive_line_14_to_16_0_~d.base) func_to_recursive_line_14_to_16_0_~d.offset) 4294967296))) (or (not (= .cse13 (mod (select (select .cse12 c_func_to_recursive_line_14_to_16_0_~c.base) c_func_to_recursive_line_14_to_16_0_~c.offset) 4294967296))) (not (= .cse11 .cse13))))))))))) is different from false [2023-11-24 23:49:20,734 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-11-24 23:49:24,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:49:24,580 INFO L93 Difference]: Finished difference Result 123 states and 156 transitions. [2023-11-24 23:49:24,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-24 23:49:24,581 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 40 states have (on average 1.175) internal successors, (47), 34 states have internal predecessors, (47), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-24 23:49:24,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:49:24,585 INFO L225 Difference]: With dead ends: 123 [2023-11-24 23:49:24,585 INFO L226 Difference]: Without dead ends: 121 [2023-11-24 23:49:24,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 954 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=387, Invalid=6583, Unknown=6, NotChecked=164, Total=7140 [2023-11-24 23:49:24,591 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 160 mSDsluCounter, 811 mSDsCounter, 0 mSdLazyCounter, 1307 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 840 SdHoareTripleChecker+Invalid, 1522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 1307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:49:24,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 840 Invalid, 1522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 1307 Invalid, 0 Unknown, 155 Unchecked, 4.7s Time] [2023-11-24 23:49:24,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2023-11-24 23:49:24,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 107. [2023-11-24 23:49:24,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 83 states have internal predecessors, (88), 20 states have call successors, (20), 18 states have call predecessors, (20), 17 states have return successors, (32), 10 states have call predecessors, (32), 18 states have call successors, (32) [2023-11-24 23:49:24,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 140 transitions. [2023-11-24 23:49:24,625 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 140 transitions. Word has length 23 [2023-11-24 23:49:24,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:49:24,630 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 140 transitions. [2023-11-24 23:49:24,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 40 states have (on average 1.175) internal successors, (47), 34 states have internal predecessors, (47), 18 states have call successors, (18), 18 states have call predecessors, (18), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:49:24,631 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 140 transitions. [2023-11-24 23:49:24,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-24 23:49:24,634 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:49:24,635 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:49:24,649 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:49:24,842 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:49:24,843 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION === [func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:49:24,843 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:49:24,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1001565442, now seen corresponding path program 1 times [2023-11-24 23:49:24,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:49:24,844 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654885484] [2023-11-24 23:49:24,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:49:24,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:49:24,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:49:28,115 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:49:28,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:49:28,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654885484] [2023-11-24 23:49:28,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654885484] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:49:28,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129037033] [2023-11-24 23:49:28,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:49:28,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:49:28,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:49:28,125 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:49:28,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:49:28,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:49:28,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 112 conjunts are in the unsatisfiable core [2023-11-24 23:49:28,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:49:28,362 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 73 [2023-11-24 23:49:28,395 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 32 [2023-11-24 23:49:28,408 INFO L378 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 24 treesize of output 1 [2023-11-24 23:49:28,425 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-11-24 23:49:28,432 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 17 [2023-11-24 23:49:28,437 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-24 23:49:28,978 INFO L349 Elim1Store]: treesize reduction 40, result has 40.3 percent of original size [2023-11-24 23:49:28,982 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 92 treesize of output 105 [2023-11-24 23:49:29,023 INFO L378 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 [2023-11-24 23:49:29,045 INFO L378 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 [2023-11-24 23:49:29,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:49:29,058 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 1 [2023-11-24 23:49:29,236 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 42 [2023-11-24 23:49:29,520 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2023-11-24 23:49:29,789 INFO L378 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 [2023-11-24 23:49:30,065 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:49:30,065 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-24 23:49:30,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129037033] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:49:30,066 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-24 23:49:30,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [23] total 35 [2023-11-24 23:49:30,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484947393] [2023-11-24 23:49:30,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:49:30,067 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-24 23:49:30,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:49:30,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-24 23:49:30,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1173, Unknown=0, NotChecked=0, Total=1260 [2023-11-24 23:49:30,069 INFO L87 Difference]: Start difference. First operand 107 states and 140 transitions. Second operand has 15 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:49:32,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-24 23:49:33,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:49:33,406 INFO L93 Difference]: Finished difference Result 201 states and 262 transitions. [2023-11-24 23:49:33,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-24 23:49:33,408 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2023-11-24 23:49:33,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:49:33,410 INFO L225 Difference]: With dead ends: 201 [2023-11-24 23:49:33,410 INFO L226 Difference]: Without dead ends: 117 [2023-11-24 23:49:33,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=135, Invalid=1757, Unknown=0, NotChecked=0, Total=1892 [2023-11-24 23:49:33,419 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 32 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 18 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2023-11-24 23:49:33,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 204 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 371 Invalid, 6 Unknown, 0 Unchecked, 2.7s Time] [2023-11-24 23:49:33,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-24 23:49:33,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 113. [2023-11-24 23:49:33,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 72 states have (on average 1.25) internal successors, (90), 85 states have internal predecessors, (90), 20 states have call successors, (20), 18 states have call predecessors, (20), 20 states have return successors, (37), 10 states have call predecessors, (37), 18 states have call successors, (37) [2023-11-24 23:49:33,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 147 transitions. [2023-11-24 23:49:33,478 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 147 transitions. Word has length 27 [2023-11-24 23:49:33,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:49:33,478 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 147 transitions. [2023-11-24 23:49:33,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (7), 5 states have call predecessors, (7), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-24 23:49:33,479 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 147 transitions. [2023-11-24 23:49:33,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-24 23:49:33,483 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:49:33,483 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-24 23:49:33,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:49:33,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:49:33,690 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION === [func_to_recursive_line_14_to_16_0Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:49:33,690 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:49:33,690 INFO L85 PathProgramCache]: Analyzing trace with hash -53924427, now seen corresponding path program 1 times [2023-11-24 23:49:33,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:49:33,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365035649] [2023-11-24 23:49:33,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:49:33,691 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:49:33,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:49:36,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:49:36,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:49:36,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365035649] [2023-11-24 23:49:36,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365035649] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:49:36,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874107359] [2023-11-24 23:49:36,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:49:36,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:49:36,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:49:36,913 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:49:36,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_77a9f3ea-cf88-4880-b56f-2ec6a36472b7/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:49:37,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:49:37,262 INFO L262 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 112 conjunts are in the unsatisfiable core [2023-11-24 23:49:37,270 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:49:37,281 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1998 treesize of output 1966 [2023-11-24 23:49:37,307 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-11-24 23:49:37,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-24 23:49:37,329 INFO L378 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 18 treesize of output 7 [2023-11-24 23:49:37,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-24 23:49:37,336 INFO L378 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 11 treesize of output 1