./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/prod4br-ll_valuebound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/config/KojakReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/prod4br-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/config/svcomp-Overflow-32bit-Kojak_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2 --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 d6a7b66d62d8261743d542694624b328b551f76289ee08b3039b7ca01c3c317e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 18:37:55,448 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 18:37:55,517 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/config/svcomp-Overflow-32bit-Kojak_Default.epf [2023-11-21 18:37:55,522 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 18:37:55,523 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.plugins.generator.codecheck.Interpolating solver [2023-11-21 18:37:55,548 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 18:37:55,549 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 18:37:55,550 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ALWAYS [2023-11-21 18:37:55,551 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 18:37:55,551 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 18:37:55,552 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 18:37:55,553 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 18:37:55,553 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 18:37:55,554 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 18:37:55,554 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 18:37:55,555 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 18:37:55,556 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 18:37:55,556 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 18:37:55,557 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 18:37:55,557 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-21 18:37:55,558 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 18:37:55,558 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 18:37:55,559 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 18:37:55,559 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 18:37:55,560 INFO L151 SettingsManager]: Preferences of CodeCheck differ from their defaults: [2023-11-21 18:37:55,560 INFO L153 SettingsManager]: * Timeout in seconds=1000000 [2023-11-21 18:37:55,561 INFO L153 SettingsManager]: * Theory for external solver=ALL [2023-11-21 18:37:55,561 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 18:37:55,561 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2023-11-21 18:37:55,562 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 18:37:55,562 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 18:37:55,563 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 18:37:55,563 INFO L153 SettingsManager]: * Trace refinement strategy=PENGUIN [2023-11-21 18:37:55,564 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 18:37:55,564 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 18:37:55,565 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_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Kojak Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d6a7b66d62d8261743d542694624b328b551f76289ee08b3039b7ca01c3c317e [2023-11-21 18:37:55,868 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 18:37:55,901 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 18:37:55,904 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 18:37:55,906 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 18:37:55,907 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 18:37:55,908 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/../../sv-benchmarks/c/nla-digbench-scaling/prod4br-ll_valuebound20.c [2023-11-21 18:37:59,324 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 18:37:59,531 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 18:37:59,531 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/sv-benchmarks/c/nla-digbench-scaling/prod4br-ll_valuebound20.c [2023-11-21 18:37:59,541 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/data/1c0347991/36bf3d0f199140c283775124ff2e23c2/FLAGb9c93e77a [2023-11-21 18:37:59,565 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/data/1c0347991/36bf3d0f199140c283775124ff2e23c2 [2023-11-21 18:37:59,570 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 18:37:59,572 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 18:37:59,576 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 18:37:59,576 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 18:37:59,583 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 18:37:59,587 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,589 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a970ffb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59, skipping insertion in model container [2023-11-21 18:37:59,589 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,619 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 18:37:59,851 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 18:37:59,864 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 18:37:59,889 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 18:37:59,903 INFO L206 MainTranslator]: Completed translation [2023-11-21 18:37:59,903 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59 WrapperNode [2023-11-21 18:37:59,903 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 18:37:59,905 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 18:37:59,905 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 18:37:59,905 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 18:37:59,914 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,924 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,954 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 102 [2023-11-21 18:37:59,955 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 18:37:59,956 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 18:37:59,956 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 18:37:59,957 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 18:37:59,969 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,969 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,971 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,972 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,978 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,983 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,985 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,986 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,989 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 18:37:59,991 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 18:37:59,991 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 18:37:59,991 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 18:37:59,992 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 06:37:59" (1/1) ... [2023-11-21 18:37:59,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 [2023-11-21 18:38:00,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/z3 [2023-11-21 18:38:00,032 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (exit command is (exit), workingDir is null) [2023-11-21 18:38:00,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52713e89-a97e-411c-8930-2ff35d581401/bin/ukojak-verify-i0I2FZA1j2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:10000 (1)] Waiting until timeout for monitored process [2023-11-21 18:38:00,092 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 18:38:00,093 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-21 18:38:00,093 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-21 18:38:00,093 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 18:38:00,094 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 18:38:00,095 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 18:38:00,095 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 18:38:00,096 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 18:38:00,181 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 18:38:00,183 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 18:38:00,685 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 18:38:00,767 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 18:38:00,767 INFO L308 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-21 18:38:00,770 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 06:38:00 BoogieIcfgContainer [2023-11-21 18:38:00,770 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 18:38:00,771 INFO L112 PluginConnector]: ------------------------CodeCheck---------------------------- [2023-11-21 18:38:00,771 INFO L270 PluginConnector]: Initializing CodeCheck... [2023-11-21 18:38:00,783 INFO L274 PluginConnector]: CodeCheck initialized [2023-11-21 18:38:00,783 INFO L184 PluginConnector]: Executing the observer CodeCheckObserver from plugin CodeCheck for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 06:38:00" (1/1) ... [2023-11-21 18:38:00,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 18:38:00,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:00,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 104 states and 112 transitions. [2023-11-21 18:38:00,853 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2023-11-21 18:38:00,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 18:38:00,859 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:00,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:01,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:01,015 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-21 18:38:01,021 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:01,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 18:38:01,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:01,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 106 states and 117 transitions. [2023-11-21 18:38:01,475 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 117 transitions. [2023-11-21 18:38:01,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 18:38:01,476 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:01,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:01,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:01,535 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-21 18:38:01,538 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:01,751 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:02,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:02,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 109 states and 125 transitions. [2023-11-21 18:38:02,190 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 125 transitions. [2023-11-21 18:38:02,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-21 18:38:02,191 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:02,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:02,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:02,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-21 18:38:02,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:02,348 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 18:38:02,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:02,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 113 states and 134 transitions. [2023-11-21 18:38:02,705 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 134 transitions. [2023-11-21 18:38:02,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 18:38:02,706 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:02,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:02,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:02,785 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-21 18:38:02,787 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:02,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:03,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:03,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 118 states and 144 transitions. [2023-11-21 18:38:03,614 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 144 transitions. [2023-11-21 18:38:03,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-21 18:38:03,615 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:03,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:03,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:03,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:03,669 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:03,773 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:04,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:04,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 124 states and 156 transitions. [2023-11-21 18:38:04,514 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 156 transitions. [2023-11-21 18:38:04,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 18:38:04,515 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:04,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:04,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:04,555 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:04,557 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:04,793 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:05,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:05,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 131 states and 170 transitions. [2023-11-21 18:38:05,964 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 170 transitions. [2023-11-21 18:38:05,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 18:38:05,965 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:05,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:05,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:05,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-21 18:38:05,995 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:06,118 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:07,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:07,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 139 states and 186 transitions. [2023-11-21 18:38:07,933 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 186 transitions. [2023-11-21 18:38:07,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 18:38:07,934 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:07,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:07,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:07,973 INFO L262 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-21 18:38:07,977 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:08,114 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:08,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:08,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 140 states and 187 transitions. [2023-11-21 18:38:08,162 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 187 transitions. [2023-11-21 18:38:08,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 18:38:08,163 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:08,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:08,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:08,211 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 18:38:08,213 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:08,407 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:08,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:08,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 143 states and 192 transitions. [2023-11-21 18:38:08,495 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 192 transitions. [2023-11-21 18:38:08,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-21 18:38:08,497 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:08,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:08,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:08,549 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 18:38:08,559 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:08,631 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:08,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:08,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 142 states and 191 transitions. [2023-11-21 18:38:08,815 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 191 transitions. [2023-11-21 18:38:08,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-21 18:38:08,816 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:08,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:08,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:08,850 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:08,852 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:08,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:11,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:11,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 151 states and 209 transitions. [2023-11-21 18:38:11,323 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 209 transitions. [2023-11-21 18:38:11,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-21 18:38:11,331 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:11,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:11,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:11,383 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 18:38:11,385 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:11,455 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:11,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:11,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 150 states and 208 transitions. [2023-11-21 18:38:11,545 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 208 transitions. [2023-11-21 18:38:11,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-21 18:38:11,546 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:11,547 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:11,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:11,577 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-21 18:38:11,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:11,816 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:35,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:35,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 161 states and 230 transitions. [2023-11-21 18:38:35,532 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 230 transitions. [2023-11-21 18:38:35,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-21 18:38:35,533 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:35,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:35,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:35,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:35,581 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:35,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:35,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:35,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 164 states and 234 transitions. [2023-11-21 18:38:35,692 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 234 transitions. [2023-11-21 18:38:35,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-21 18:38:35,693 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:35,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:35,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:35,723 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 18:38:35,729 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:35,841 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:35,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:35,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 163 states and 233 transitions. [2023-11-21 18:38:35,954 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 233 transitions. [2023-11-21 18:38:35,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-21 18:38:35,955 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:35,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:35,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:35,990 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:35,992 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:36,039 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:36,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:36,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 166 states and 237 transitions. [2023-11-21 18:38:36,638 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 237 transitions. [2023-11-21 18:38:36,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-21 18:38:36,638 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:36,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:36,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:36,682 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 18:38:36,690 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:37,087 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:41,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:41,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 177 states and 259 transitions. [2023-11-21 18:38:41,497 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 259 transitions. [2023-11-21 18:38:41,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-21 18:38:41,498 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:41,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:41,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:41,537 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-21 18:38:41,539 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:41,735 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-21 18:38:56,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:56,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 182 states and 269 transitions. [2023-11-21 18:38:56,161 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 269 transitions. [2023-11-21 18:38:56,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-21 18:38:56,162 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:56,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:56,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:56,193 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 18:38:56,194 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:56,236 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 18:38:56,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand no size info available [2023-11-21 18:38:56,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 185 states and 273 transitions. [2023-11-21 18:38:56,316 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 273 transitions. [2023-11-21 18:38:56,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-21 18:38:56,317 INFO L423 CodeCheckObserver]: Error Path is FOUND. [2023-11-21 18:38:56,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 18:38:56,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 18:38:56,359 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-21 18:38:56,362 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 18:38:56,779 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.