./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/uthash-2.0.2/uthash_SFH_nondet_test3-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 30e01a73 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_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/config/KojakReach.xml -i ../../sv-benchmarks/c/uthash-2.0.2/uthash_SFH_nondet_test3-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/config/svcomp-Overflow-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Kojak --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash be29e8161f6a6b8e8b181f151bf5388e6a9e3237ae426f572d4ceda403cee9b8 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:22:23,513 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:22:23,643 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/config/svcomp-Overflow-32bit-Kojak_Default.epf [2023-11-23 20:22:23,651 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:22:23,652 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.Interpolating solver [2023-11-23 20:22:23,705 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:22:23,706 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:22:23,707 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2023-11-23 20:22:23,708 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 20:22:23,713 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 20:22:23,714 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:22:23,715 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:22:23,715 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:22:23,717 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:22:23,717 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:22:23,718 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:22:23,718 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:22:23,719 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:22:23,719 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:22:23,720 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-23 20:22:23,720 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 20:22:23,721 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:22:23,721 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:22:23,722 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:22:23,722 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2023-11-23 20:22:23,723 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2023-11-23 20:22:23,723 INFO L153 SettingsManager]: * Theory for external solver=ALL [2023-11-23 20:22:23,724 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:22:23,724 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2023-11-23 20:22:23,725 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:22:23,726 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:22:23,726 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:22:23,727 INFO L153 SettingsManager]: * Trace refinement strategy=PENGUIN [2023-11-23 20:22:23,727 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:22:23,727 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:22:23,727 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be29e8161f6a6b8e8b181f151bf5388e6a9e3237ae426f572d4ceda403cee9b8 [2023-11-23 20:22:24,048 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:22:24,081 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:22:24,084 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:22:24,085 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:22:24,086 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:22:24,088 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/../../sv-benchmarks/c/uthash-2.0.2/uthash_SFH_nondet_test3-2.i [2023-11-23 20:22:27,160 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:22:27,635 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:22:27,635 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/sv-benchmarks/c/uthash-2.0.2/uthash_SFH_nondet_test3-2.i [2023-11-23 20:22:27,654 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/data/dc734b9ae/94855cd5313a44878094314d6817dc86/FLAG05ad2b1dc [2023-11-23 20:22:27,670 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/data/dc734b9ae/94855cd5313a44878094314d6817dc86 [2023-11-23 20:22:27,673 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:22:27,674 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:22:27,676 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:22:27,676 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:22:27,682 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:22:27,683 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:22:27" (1/1) ... [2023-11-23 20:22:27,684 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79f857 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:27, skipping insertion in model container [2023-11-23 20:22:27,684 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:22:27" (1/1) ... [2023-11-23 20:22:27,793 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:22:28,165 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 20:22:28,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:22:28,534 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:22:28,556 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 20:22:28,663 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:22:28,709 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 20:22:28,709 WARN L675 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 20:22:28,717 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:22:28,718 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28 WrapperNode [2023-11-23 20:22:28,718 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:22:28,720 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:22:28,720 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:22:28,720 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:22:28,729 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:28,799 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:28,914 INFO L138 Inliner]: procedures = 178, calls = 334, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1514 [2023-11-23 20:22:28,914 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:22:28,915 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:22:28,915 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:22:28,931 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:22:28,945 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:28,946 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:28,957 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:28,957 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,026 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,047 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,063 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,073 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,098 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:22:29,099 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:22:29,100 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:22:29,100 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:22:29,101 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:28" (1/1) ... [2023-11-23 20:22:29,107 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2023-11-23 20:22:29,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/z3 [2023-11-23 20:22:29,140 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2023-11-23 20:22:29,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0276d635-ce12-4f7f-a468-542af353e01f/bin/ukojak-verify-1t5iHCbJaC/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2023-11-23 20:22:29,180 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 20:22:29,182 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 20:22:29,182 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 20:22:29,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:22:29,183 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2023-11-23 20:22:29,183 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2023-11-23 20:22:29,183 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 20:22:29,183 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:22:29,184 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 20:22:29,184 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 20:22:29,184 INFO L130 BoogieDeclarations]: Found specification of procedure memcmp [2023-11-23 20:22:29,184 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 20:22:29,184 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:22:29,185 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:22:29,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:22:29,187 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:22:29,523 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:22:29,529 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:22:31,269 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:22:33,018 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:22:33,018 INFO L309 CfgBuilder]: Removed 72 assume(true) statements. [2023-11-23 20:22:33,020 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:22:33 BoogieIcfgContainer [2023-11-23 20:22:33,020 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:22:33,021 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2023-11-23 20:22:33,021 INFO L270 PluginConnector]: Initializing CodeCheck... [2023-11-23 20:22:33,031 INFO L274 PluginConnector]: CodeCheck initialized [2023-11-23 20:22:33,031 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:22:33" (1/1) ... [2023-11-23 20:22:33,040 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:22:33,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:33,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 146 states and 240 transitions. [2023-11-23 20:22:33,102 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 240 transitions. [2023-11-23 20:22:33,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 20:22:33,104 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:33,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:33,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:33,337 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-23 20:22:33,344 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:33,409 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 [2023-11-23 20:22:33,441 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:22:33,507 INFO L160 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:22:33,508 INFO L165 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2023-11-23 20:22:33,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:22:33,516 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-11-23 20:22:33,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:33,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:33,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 149 states and 245 transitions. [2023-11-23 20:22:33,603 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 245 transitions. [2023-11-23 20:22:33,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 20:22:33,603 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:33,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:33,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:33,707 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-23 20:22:33,711 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:33,715 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 [2023-11-23 20:22:33,725 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:22:33,783 INFO L160 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:22:33,784 INFO L165 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2023-11-23 20:22:33,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:22:33,792 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2023-11-23 20:22:33,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:33,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:33,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 150 states and 246 transitions. [2023-11-23 20:22:33,889 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 246 transitions. [2023-11-23 20:22:33,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 20:22:33,890 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:33,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:33,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:33,980 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:22:33,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:33,985 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:33,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:33,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 150 states and 244 transitions. [2023-11-23 20:22:33,993 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 244 transitions. [2023-11-23 20:22:33,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 20:22:34,000 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:22:34,098 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:34,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:34,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:34,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 150 states and 240 transitions. [2023-11-23 20:22:34,109 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 240 transitions. [2023-11-23 20:22:34,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 20:22:34,113 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,188 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:34,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:34,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 150 states and 235 transitions. [2023-11-23 20:22:34,211 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 235 transitions. [2023-11-23 20:22:34,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 20:22:34,213 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:34,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:34,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 150 states and 231 transitions. [2023-11-23 20:22:34,307 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 231 transitions. [2023-11-23 20:22:34,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 20:22:34,311 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,435 INFO L262 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:22:34,438 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:34,441 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:34,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:34,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 150 states and 225 transitions. [2023-11-23 20:22:34,447 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 225 transitions. [2023-11-23 20:22:34,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:22:34,449 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:34,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:34,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 150 states and 223 transitions. [2023-11-23 20:22:34,509 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 223 transitions. [2023-11-23 20:22:34,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 20:22:34,511 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:34,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:34,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:34,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:36,169 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.52s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:22:36,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:36,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 150 states and 221 transitions. [2023-11-23 20:22:36,184 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 221 transitions. [2023-11-23 20:22:36,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 20:22:36,185 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:36,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:36,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:36,575 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:36,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:36,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 150 states and 220 transitions. [2023-11-23 20:22:36,609 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 220 transitions. [2023-11-23 20:22:36,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 20:22:36,610 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:36,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:36,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:36,816 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:22:36,819 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:36,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:46,844 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:22:46,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:46,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 150 states and 214 transitions. [2023-11-23 20:22:46,915 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 214 transitions. [2023-11-23 20:22:46,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 20:22:46,916 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:46,916 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:46,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:47,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:47,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:47,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 154 states and 218 transitions. [2023-11-23 20:22:47,097 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 218 transitions. [2023-11-23 20:22:47,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-11-23 20:22:47,099 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:47,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:47,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:47,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:47,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:22:47,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 154 states and 214 transitions. [2023-11-23 20:22:47,201 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 214 transitions. [2023-11-23 20:22:47,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:22:47,205 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:22:47,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:22:47,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:22:47,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 20:22:47,479 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:22:47,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:22:57,999 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:23:08,039 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.04s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:23:18,048 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:23:28,058 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 20:23:28,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:23:28,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 169 states and 233 transitions. [2023-11-23 20:23:28,082 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 233 transitions. [2023-11-23 20:23:28,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:23:28,083 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:23:28,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:23:28,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:23:28,284 INFO L262 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:23:28,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:23:28,302 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:23:28,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:23:28,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 169 states and 231 transitions. [2023-11-23 20:23:28,312 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 231 transitions. [2023-11-23 20:23:28,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 20:23:28,313 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:23:28,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:23:28,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:23:28,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 316 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:23:28,601 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:23:28,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:23:28,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-23 20:23:28,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 169 states and 229 transitions. [2023-11-23 20:23:28,615 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 229 transitions. [2023-11-23 20:23:28,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-23 20:23:28,616 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-23 20:23:28,616 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:23:28,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:23:28,858 INFO L262 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:23:28,861 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:23:28,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.