./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 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_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5 --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 27783f29349ebae8401558a8bc17fafd87092d54a86e2af0abb3d67f703ff6c0 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:45:24,787 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:45:24,864 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:45:24,868 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:45:24,869 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:45:24,895 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:45:24,896 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:45:24,897 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:45:24,898 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:45:24,898 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:45:24,899 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:45:24,900 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:45:24,900 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:45:24,901 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:45:24,902 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:45:24,902 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:45:24,903 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:45:24,904 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:45:24,904 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:45:24,905 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:45:24,906 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:45:24,907 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:45:24,908 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:45:24,908 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:45:24,909 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:45:24,909 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:45:24,910 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:45:24,911 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:45:24,911 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:45:24,912 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:45:24,912 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:45:24,913 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:45:24,914 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:45:24,914 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:45:24,915 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:45:24,915 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:45:24,916 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:45:24,916 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:24,917 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:45:24,917 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:45:24,918 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:45:24,919 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:45:24,919 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:45:24,919 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:45:24,920 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:45:24,920 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:45:24,921 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:45:24,921 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_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 27783f29349ebae8401558a8bc17fafd87092d54a86e2af0abb3d67f703ff6c0 [2023-11-21 19:45:25,201 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:45:25,227 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:45:25,230 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:45:25,232 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:45:25,233 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:45:25,235 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c [2023-11-21 19:45:28,497 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:45:28,806 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:45:28,806 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c [2023-11-21 19:45:28,815 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/data/06a20dfc7/6d7c98fbca604ab884451ec83a00a0a4/FLAG85291391d [2023-11-21 19:45:28,831 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/data/06a20dfc7/6d7c98fbca604ab884451ec83a00a0a4 [2023-11-21 19:45:28,835 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:45:28,837 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:45:28,838 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:28,839 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:45:28,845 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:45:28,846 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:28" (1/1) ... [2023-11-21 19:45:28,847 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a67f6bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:28, skipping insertion in model container [2023-11-21 19:45:28,848 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:28" (1/1) ... [2023-11-21 19:45:28,875 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:45:29,030 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_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c[1080,1093] [2023-11-21 19:45:29,057 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:29,073 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:45:29,086 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_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/sv-benchmarks/c/recursified_nla-digbench/recursified_hard-u.c[1080,1093] [2023-11-21 19:45:29,101 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:29,118 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:45:29,118 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29 WrapperNode [2023-11-21 19:45:29,118 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:29,120 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:29,120 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:45:29,120 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:45:29,128 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,138 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,163 INFO L138 Inliner]: procedures = 17, calls = 84, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 77 [2023-11-21 19:45:29,164 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:29,165 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:45:29,165 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:45:29,165 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:45:29,173 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,174 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,177 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,178 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,188 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,191 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,198 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,209 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,213 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:45:29,214 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:45:29,214 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:45:29,214 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:45:29,215 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (1/1) ... [2023-11-21 19:45:29,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:29,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:29,275 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:45:29,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:45:29,324 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:45:29,325 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:45:29,325 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_41_to_51_0 [2023-11-21 19:45:29,326 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_41_to_51_0 [2023-11-21 19:45:29,326 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 19:45:29,326 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_31_to_38_0 [2023-11-21 19:45:29,326 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_31_to_38_0 [2023-11-21 19:45:29,326 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:45:29,326 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:45:29,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:45:29,327 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:45:29,327 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 19:45:29,327 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 19:45:29,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:45:29,428 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:45:29,430 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:45:29,806 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:45:29,942 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:45:29,942 INFO L308 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-21 19:45:29,944 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:29 BoogieIcfgContainer [2023-11-21 19:45:29,944 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:45:29,949 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:45:29,949 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:45:29,953 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:45:29,953 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:45:28" (1/3) ... [2023-11-21 19:45:29,954 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477469eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:29, skipping insertion in model container [2023-11-21 19:45:29,962 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:29" (2/3) ... [2023-11-21 19:45:29,962 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477469eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:29, skipping insertion in model container [2023-11-21 19:45:29,962 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:29" (3/3) ... [2023-11-21 19:45:29,964 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_hard-u.c [2023-11-21 19:45:29,984 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:45:29,985 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:45:30,036 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:45:30,043 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;@5fbb9687, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:45:30,044 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:45:30,048 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 24 states have internal predecessors, (27), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-21 19:45:30,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 19:45:30,055 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:30,056 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:30,056 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:30,061 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:30,061 INFO L85 PathProgramCache]: Analyzing trace with hash -446774543, now seen corresponding path program 1 times [2023-11-21 19:45:30,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:30,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451230106] [2023-11-21 19:45:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:30,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:30,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:31,007 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:31,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:31,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451230106] [2023-11-21 19:45:31,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451230106] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:31,009 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:31,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-21 19:45:31,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664116676] [2023-11-21 19:45:31,012 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:31,017 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:45:31,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:31,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:45:31,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:31,053 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 24 states have internal predecessors, (27), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:45:31,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:31,356 INFO L93 Difference]: Finished difference Result 81 states and 119 transitions. [2023-11-21 19:45:31,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-21 19:45:31,359 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 19:45:31,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:31,369 INFO L225 Difference]: With dead ends: 81 [2023-11-21 19:45:31,369 INFO L226 Difference]: Without dead ends: 44 [2023-11-21 19:45:31,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:31,378 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 20 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:31,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 171 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:31,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-21 19:45:31,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 39. [2023-11-21 19:45:31,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 26 states have internal predecessors, (26), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-21 19:45:31,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2023-11-21 19:45:31,427 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 8 [2023-11-21 19:45:31,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:31,427 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2023-11-21 19:45:31,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:45:31,428 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2023-11-21 19:45:31,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:45:31,429 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:31,429 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:31,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:45:31,430 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:31,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:31,431 INFO L85 PathProgramCache]: Analyzing trace with hash -1156065846, now seen corresponding path program 1 times [2023-11-21 19:45:31,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:31,431 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584833360] [2023-11-21 19:45:31,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:31,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:31,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:32,603 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:32,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:32,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584833360] [2023-11-21 19:45:32,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584833360] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:32,605 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:32,606 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 19:45:32,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574142868] [2023-11-21 19:45:32,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:32,608 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:45:32,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:32,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:45:32,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:45:32,610 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:45:32,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:32,904 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2023-11-21 19:45:32,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:45:32,905 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-21 19:45:32,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:32,908 INFO L225 Difference]: With dead ends: 57 [2023-11-21 19:45:32,908 INFO L226 Difference]: Without dead ends: 55 [2023-11-21 19:45:32,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:32,910 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 16 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:32,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 200 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:32,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-21 19:45:32,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2023-11-21 19:45:32,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 33 states have (on average 1.121212121212121) internal successors, (37), 36 states have internal predecessors, (37), 14 states have call successors, (14), 6 states have call predecessors, (14), 6 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-11-21 19:45:32,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2023-11-21 19:45:32,942 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 14 [2023-11-21 19:45:32,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:32,942 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2023-11-21 19:45:32,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:45:32,943 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2023-11-21 19:45:32,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:45:32,944 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:32,944 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:32,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:45:32,945 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:32,948 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:32,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1393923359, now seen corresponding path program 1 times [2023-11-21 19:45:32,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:32,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764461986] [2023-11-21 19:45:32,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:32,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:32,990 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:32,990 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1262693108] [2023-11-21 19:45:32,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:32,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:32,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:33,000 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:33,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:45:33,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:33,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 71 conjunts are in the unsatisfiable core [2023-11-21 19:45:33,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:33,458 INFO L349 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2023-11-21 19:45:33,462 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 202 treesize of output 81 [2023-11-21 19:45:33,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:33,625 INFO L349 Elim1Store]: treesize reduction 76, result has 31.5 percent of original size [2023-11-21 19:45:33,625 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 10 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 47 treesize of output 76 [2023-11-21 19:45:33,702 INFO L349 Elim1Store]: treesize reduction 48, result has 2.0 percent of original size [2023-11-21 19:45:33,703 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 165 treesize of output 157 [2023-11-21 19:45:33,957 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 12 treesize of output 11 [2023-11-21 19:45:34,095 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 [2023-11-21 19:45:34,869 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 13 [2023-11-21 19:45:34,942 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:45:34,942 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:35,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:35,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:35,784 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764461986] [2023-11-21 19:45:35,784 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:35,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262693108] [2023-11-21 19:45:35,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262693108] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:35,785 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:45:35,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 17 [2023-11-21 19:45:35,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199249684] [2023-11-21 19:45:35,786 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:35,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:45:35,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:35,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:45:35,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:35,788 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:39,206 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2023-11-21 19:45:39,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:39,978 INFO L93 Difference]: Finished difference Result 61 states and 72 transitions. [2023-11-21 19:45:39,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:45:39,979 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-11-21 19:45:39,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:39,981 INFO L225 Difference]: With dead ends: 61 [2023-11-21 19:45:39,981 INFO L226 Difference]: Without dead ends: 59 [2023-11-21 19:45:39,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2023-11-21 19:45:39,983 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 15 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:39,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 200 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 119 Invalid, 1 Unknown, 0 Unchecked, 2.9s Time] [2023-11-21 19:45:39,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-21 19:45:40,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2023-11-21 19:45:40,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 39 states have internal predecessors, (40), 14 states have call successors, (14), 7 states have call predecessors, (14), 7 states have return successors, (14), 13 states have call predecessors, (14), 13 states have call successors, (14) [2023-11-21 19:45:40,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2023-11-21 19:45:40,022 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 20 [2023-11-21 19:45:40,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:40,023 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2023-11-21 19:45:40,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-21 19:45:40,023 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2023-11-21 19:45:40,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-21 19:45:40,024 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:40,025 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:40,048 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-21 19:45:40,245 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:40,246 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:40,247 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:40,247 INFO L85 PathProgramCache]: Analyzing trace with hash -885012426, now seen corresponding path program 1 times [2023-11-21 19:45:40,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:40,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920688946] [2023-11-21 19:45:40,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:40,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:40,293 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:45:40,294 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1970308998] [2023-11-21 19:45:40,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:40,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:40,294 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:40,296 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:40,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:45:40,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:40,508 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 92 conjunts are in the unsatisfiable core [2023-11-21 19:45:40,515 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:40,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,572 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 257 treesize of output 46 [2023-11-21 19:45:40,662 INFO L349 Elim1Store]: treesize reduction 74, result has 8.6 percent of original size [2023-11-21 19:45:40,662 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 494 treesize of output 488 [2023-11-21 19:45:40,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:45:40,778 INFO L349 Elim1Store]: treesize reduction 26, result has 44.7 percent of original size [2023-11-21 19:45:40,779 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 2 case distinctions, treesize of input 37 treesize of output 63 [2023-11-21 19:45:41,551 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 9 treesize of output 7 [2023-11-21 19:45:41,578 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-11-21 19:45:41,579 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 31 [2023-11-21 19:45:41,907 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 13 [2023-11-21 19:45:41,962 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 19:45:41,962 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:43,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:43,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920688946] [2023-11-21 19:45:43,067 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 19:45:43,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970308998] [2023-11-21 19:45:43,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970308998] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:43,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [106270933] [2023-11-21 19:45:43,099 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-21 19:45:43,100 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:43,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:45:43,112 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:45:43,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:45:44,141 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_41_to_51_0 with input of size 129 for LOIs [2023-11-21 19:45:44,421 INFO L197 IcfgInterpreter]: Interpreting procedure func_to_recursive_line_31_to_38_0 with input of size 135 for LOIs [2023-11-21 19:45:46,518 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-21 19:45:46,524 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:46:17,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-21 19:46:17,684 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:46:17,684 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:46:17,684 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2023-11-21 19:46:17,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454486853] [2023-11-21 19:46:17,686 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-21 19:46:17,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:46:17,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:46:17,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:46:17,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=986, Unknown=7, NotChecked=0, Total=1122 [2023-11-21 19:46:17,688 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 19:46:18,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:46:18,491 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2023-11-21 19:46:18,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-21 19:46:18,495 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2023-11-21 19:46:18,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:46:18,498 INFO L225 Difference]: With dead ends: 82 [2023-11-21 19:46:18,498 INFO L226 Difference]: Without dead ends: 80 [2023-11-21 19:46:18,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=180, Invalid=1453, Unknown=7, NotChecked=0, Total=1640 [2023-11-21 19:46:18,501 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 42 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:46:18,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 107 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:46:18,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-21 19:46:18,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2023-11-21 19:46:18,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 50 states have internal predecessors, (52), 17 states have call successors, (17), 9 states have call predecessors, (17), 11 states have return successors, (21), 16 states have call predecessors, (21), 16 states have call successors, (21) [2023-11-21 19:46:18,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 90 transitions. [2023-11-21 19:46:18,519 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 90 transitions. Word has length 32 [2023-11-21 19:46:18,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:46:18,520 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 90 transitions. [2023-11-21 19:46:18,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.9) internal successors, (19), 11 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-21 19:46:18,520 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 90 transitions. [2023-11-21 19:46:18,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-21 19:46:18,522 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:46:18,522 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:46:18,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:46:18,736 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:18,736 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:46:18,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:46:18,737 INFO L85 PathProgramCache]: Analyzing trace with hash -481527494, now seen corresponding path program 1 times [2023-11-21 19:46:18,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:46:18,737 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042482533] [2023-11-21 19:46:18,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:18,738 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:46:18,763 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 19:46:18,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1715638536] [2023-11-21 19:46:18,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:46:18,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:46:18,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:46:18,765 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:46:18,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d8d7ed7b-f5f2-49cd-87cc-eaa093d6d517/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:46:18,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:46:18,942 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 89 conjunts are in the unsatisfiable core [2023-11-21 19:46:18,949 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:46:18,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:18,986 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 42 [2023-11-21 19:46:19,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:46:19,032 INFO L349 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2023-11-21 19:46:19,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 82 treesize of output 72 [2023-11-21 19:46:19,053 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 15 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2023-11-21 19:46:21,379 WARN L876 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main_~#d~0#1.offset| Int) (v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_20 Int) (v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_16 Int) (|ULTIMATE.start_main_~#B~0#1.offset| Int) (v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_19 Int) (v_func_to_recursive_line_31_to_38_0_~A.offset_BEFORE_CALL_16 Int) (|ULTIMATE.start_main_~#B~0#1.base| Int) (v_func_to_recursive_line_31_to_38_0_~r.offset_BEFORE_CALL_19 Int)) (and (not (= v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_20 v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_16)) (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_16)) (not (= v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_19 v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_20)) (= (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_16) v_func_to_recursive_line_31_to_38_0_~A.offset_BEFORE_CALL_16) (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_19) v_func_to_recursive_line_31_to_38_0_~r.offset_BEFORE_CALL_19)) (= (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_20) |ULTIMATE.start_main_~#d~0#1.offset|) (select (select |c_#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) |ULTIMATE.start_main_~#B~0#1.offset|)) (not (= v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_19 v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_16)) (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_20)) (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_19)))) is different from true [2023-11-21 19:46:23,680 WARN L876 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main_~#d~0#1.offset| Int) (v_func_to_recursive_line_31_to_38_0_~r.offset_BEFORE_CALL_20 Int) (v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_20 Int) (v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_17 Int) (|ULTIMATE.start_main_~#B~0#1.offset| Int) (|ULTIMATE.start_main_~#B~0#1.base| Int) (v_func_to_recursive_line_31_to_38_0_~A.offset_BEFORE_CALL_17 Int) (v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_21 Int)) (and (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_20)) (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_17)) (not (= v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_20 v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_21)) (= (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_17) v_func_to_recursive_line_31_to_38_0_~A.offset_BEFORE_CALL_17) (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_20) v_func_to_recursive_line_31_to_38_0_~r.offset_BEFORE_CALL_20)) (not (= v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_21 v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_17)) (not (= v_func_to_recursive_line_31_to_38_0_~r.base_BEFORE_CALL_20 v_func_to_recursive_line_31_to_38_0_~A.base_BEFORE_CALL_17)) (not (= |ULTIMATE.start_main_~#B~0#1.base| v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_21)) (= (select (select |c_#memory_int| v_func_to_recursive_line_31_to_38_0_~d.base_BEFORE_CALL_21) |ULTIMATE.start_main_~#d~0#1.offset|) (select (select |c_#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) |ULTIMATE.start_main_~#B~0#1.offset|)))) is different from true