./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 07:48:13,742 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 07:48:13,871 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-19 07:48:13,879 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 07:48:13,880 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 07:48:13,919 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 07:48:13,920 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 07:48:13,921 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 07:48:13,922 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 07:48:13,927 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 07:48:13,929 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 07:48:13,930 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 07:48:13,930 INFO L153 SettingsManager]: * Use SBE=true [2023-11-19 07:48:13,932 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 07:48:13,933 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 07:48:13,933 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 07:48:13,934 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 07:48:13,934 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 07:48:13,935 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 07:48:13,935 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 07:48:13,936 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 07:48:13,936 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 07:48:13,937 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 07:48:13,937 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 07:48:13,938 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 07:48:13,939 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 07:48:13,939 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 07:48:13,940 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 07:48:13,940 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:48:13,941 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 07:48:13,942 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 07:48:13,943 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 07:48:13,943 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-19 07:48:13,943 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 07:48:13,944 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-19 07:48:13,944 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 07:48:13,944 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-19 07:48:13,944 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 07:48:13,945 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-19 07:48:13,945 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fc71ae13b1bed24e074eb2de07c8f2064aa903343708c3aabf1b928078c9e7f6 [2023-11-19 07:48:14,248 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 07:48:14,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 07:48:14,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 07:48:14,311 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 07:48:14,312 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 07:48:14,313 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2023-11-19 07:48:17,483 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 07:48:17,676 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 07:48:17,678 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c [2023-11-19 07:48:17,686 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/data/8aa23993c/c3a91cd3277c477986c5c7e09fde59a1/FLAG2bd7aa04b [2023-11-19 07:48:17,701 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/data/8aa23993c/c3a91cd3277c477986c5c7e09fde59a1 [2023-11-19 07:48:17,704 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 07:48:17,706 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 07:48:17,707 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 07:48:17,707 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 07:48:17,713 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 07:48:17,714 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:17,715 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6aa7ba5b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17, skipping insertion in model container [2023-11-19 07:48:17,716 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:17,743 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 07:48:17,891 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_78f0a0b2-50dd-45cc-8fe0-fab882714730/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2023-11-19 07:48:17,915 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:48:17,926 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 07:48:17,936 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_78f0a0b2-50dd-45cc-8fe0-fab882714730/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound50.c[490,503] [2023-11-19 07:48:17,948 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:48:17,964 INFO L206 MainTranslator]: Completed translation [2023-11-19 07:48:17,964 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17 WrapperNode [2023-11-19 07:48:17,965 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 07:48:17,966 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 07:48:17,966 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 07:48:17,967 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 07:48:17,975 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:17,983 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,006 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 79 [2023-11-19 07:48:18,007 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 07:48:18,007 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 07:48:18,008 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 07:48:18,008 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 07:48:18,018 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,018 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,020 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,020 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,024 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,029 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,030 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,031 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,034 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 07:48:18,035 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 07:48:18,035 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 07:48:18,035 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 07:48:18,037 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (1/1) ... [2023-11-19 07:48:18,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:48:18,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:18,086 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 07:48:18,089 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 07:48:18,117 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 07:48:18,118 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 07:48:18,118 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 07:48:18,118 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 07:48:18,122 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 07:48:18,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 07:48:18,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 07:48:18,122 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 07:48:18,183 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 07:48:18,186 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 07:48:18,378 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 07:48:18,400 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 07:48:18,401 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 07:48:18,407 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:48:18 BoogieIcfgContainer [2023-11-19 07:48:18,408 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 07:48:18,412 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 07:48:18,412 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 07:48:18,415 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 07:48:18,416 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:48:17" (1/3) ... [2023-11-19 07:48:18,417 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47a631e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:48:18, skipping insertion in model container [2023-11-19 07:48:18,417 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:48:17" (2/3) ... [2023-11-19 07:48:18,418 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47a631e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:48:18, skipping insertion in model container [2023-11-19 07:48:18,418 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:48:18" (3/3) ... [2023-11-19 07:48:18,419 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound50.c [2023-11-19 07:48:18,440 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 07:48:18,440 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 07:48:18,511 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 07:48:18,521 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=PETRI_NET, 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;@1ade5af1, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-19 07:48:18,522 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 07:48:18,527 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 21 states have internal predecessors, (28), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-19 07:48:18,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-19 07:48:18,539 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:18,539 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:18,540 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:18,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:18,551 INFO L85 PathProgramCache]: Analyzing trace with hash -1146169762, now seen corresponding path program 1 times [2023-11-19 07:48:18,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:18,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713225538] [2023-11-19 07:48:18,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:18,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:18,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:18,773 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:18,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713225538] [2023-11-19 07:48:18,774 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 07:48:18,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019237006] [2023-11-19 07:48:18,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:18,806 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:18,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:18,810 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:18,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 07:48:18,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:18,911 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 07:48:18,918 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:18,952 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-11-19 07:48:18,952 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:48:18,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019237006] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:48:18,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:48:18,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 07:48:18,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158327682] [2023-11-19 07:48:18,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:18,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 07:48:18,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:18,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 07:48:18,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 07:48:18,998 INFO L87 Difference]: Start difference. First operand has 35 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 21 states have internal predecessors, (28), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 07:48:19,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:19,024 INFO L93 Difference]: Finished difference Result 67 states and 112 transitions. [2023-11-19 07:48:19,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 07:48:19,026 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) Word has length 39 [2023-11-19 07:48:19,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:19,035 INFO L225 Difference]: With dead ends: 67 [2023-11-19 07:48:19,035 INFO L226 Difference]: Without dead ends: 31 [2023-11-19 07:48:19,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 07:48:19,043 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:19,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:48:19,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-19 07:48:19,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-19 07:48:19,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 16 states have (on average 1.1875) internal successors, (19), 18 states have internal predecessors, (19), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-19 07:48:19,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 42 transitions. [2023-11-19 07:48:19,091 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 42 transitions. Word has length 39 [2023-11-19 07:48:19,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:19,092 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 42 transitions. [2023-11-19 07:48:19,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 07:48:19,093 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 42 transitions. [2023-11-19 07:48:19,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-19 07:48:19,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:19,095 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:19,120 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:19,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:19,317 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:19,318 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:19,318 INFO L85 PathProgramCache]: Analyzing trace with hash 846808023, now seen corresponding path program 1 times [2023-11-19 07:48:19,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:19,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073789629] [2023-11-19 07:48:19,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:19,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:19,369 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:19,369 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1637901947] [2023-11-19 07:48:19,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:19,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:19,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:19,371 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:19,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 07:48:19,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:19,454 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-19 07:48:19,459 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:19,725 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 07:48:19,725 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:19,871 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:19,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073789629] [2023-11-19 07:48:19,871 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:19,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637901947] [2023-11-19 07:48:19,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637901947] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:48:19,872 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:48:19,872 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-11-19 07:48:19,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961169050] [2023-11-19 07:48:19,873 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:19,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 07:48:19,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:19,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 07:48:19,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-19 07:48:19,876 INFO L87 Difference]: Start difference. First operand 31 states and 42 transitions. Second operand has 9 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-19 07:48:20,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:20,094 INFO L93 Difference]: Finished difference Result 48 states and 65 transitions. [2023-11-19 07:48:20,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 07:48:20,095 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2023-11-19 07:48:20,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:20,097 INFO L225 Difference]: With dead ends: 48 [2023-11-19 07:48:20,097 INFO L226 Difference]: Without dead ends: 46 [2023-11-19 07:48:20,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2023-11-19 07:48:20,099 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 20 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:20,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 162 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:48:20,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-19 07:48:20,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2023-11-19 07:48:20,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 17 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-11-19 07:48:20,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 61 transitions. [2023-11-19 07:48:20,117 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 61 transitions. Word has length 40 [2023-11-19 07:48:20,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:20,118 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 61 transitions. [2023-11-19 07:48:20,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-19 07:48:20,119 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 61 transitions. [2023-11-19 07:48:20,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-19 07:48:20,120 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:20,121 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:20,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:20,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-19 07:48:20,334 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:20,335 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:20,335 INFO L85 PathProgramCache]: Analyzing trace with hash 481927254, now seen corresponding path program 1 times [2023-11-19 07:48:20,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:20,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851986018] [2023-11-19 07:48:20,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:20,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:20,367 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:20,369 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [787703331] [2023-11-19 07:48:20,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:20,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:20,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:20,373 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:20,397 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 07:48:20,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:20,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 07:48:20,445 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:20,482 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-19 07:48:20,483 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:48:20,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:20,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851986018] [2023-11-19 07:48:20,483 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:20,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787703331] [2023-11-19 07:48:20,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787703331] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:48:20,484 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:48:20,484 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 07:48:20,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206674114] [2023-11-19 07:48:20,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:20,485 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 07:48:20,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:20,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 07:48:20,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 07:48:20,487 INFO L87 Difference]: Start difference. First operand 44 states and 61 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 07:48:20,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:20,562 INFO L93 Difference]: Finished difference Result 63 states and 89 transitions. [2023-11-19 07:48:20,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 07:48:20,563 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 41 [2023-11-19 07:48:20,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:20,568 INFO L225 Difference]: With dead ends: 63 [2023-11-19 07:48:20,568 INFO L226 Difference]: Without dead ends: 61 [2023-11-19 07:48:20,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 07:48:20,573 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:20,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 142 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:48:20,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-19 07:48:20,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2023-11-19 07:48:20,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 32 states have internal predecessors, (33), 19 states have call successors, (19), 4 states have call predecessors, (19), 4 states have return successors, (18), 15 states have call predecessors, (18), 18 states have call successors, (18) [2023-11-19 07:48:20,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 70 transitions. [2023-11-19 07:48:20,611 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 70 transitions. Word has length 41 [2023-11-19 07:48:20,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:20,611 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 70 transitions. [2023-11-19 07:48:20,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 07:48:20,612 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 70 transitions. [2023-11-19 07:48:20,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-19 07:48:20,614 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:20,614 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:20,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:20,835 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:20,835 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:20,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:20,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1261948650, now seen corresponding path program 1 times [2023-11-19 07:48:20,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:20,836 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942435534] [2023-11-19 07:48:20,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:20,836 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:20,864 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:20,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462551454] [2023-11-19 07:48:20,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:20,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:20,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:20,868 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:20,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 07:48:20,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:20,941 INFO L262 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-19 07:48:20,948 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:21,190 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 07:48:21,191 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:21,338 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-11-19 07:48:21,339 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:21,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942435534] [2023-11-19 07:48:21,339 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:21,339 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462551454] [2023-11-19 07:48:21,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462551454] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 07:48:21,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:48:21,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2023-11-19 07:48:21,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155695854] [2023-11-19 07:48:21,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:21,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 07:48:21,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:21,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 07:48:21,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-11-19 07:48:21,346 INFO L87 Difference]: Start difference. First operand 52 states and 70 transitions. Second operand has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-19 07:48:21,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:21,489 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2023-11-19 07:48:21,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 07:48:21,490 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2023-11-19 07:48:21,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:21,491 INFO L225 Difference]: With dead ends: 60 [2023-11-19 07:48:21,492 INFO L226 Difference]: Without dead ends: 56 [2023-11-19 07:48:21,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2023-11-19 07:48:21,493 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 12 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:21,494 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 165 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:48:21,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2023-11-19 07:48:21,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2023-11-19 07:48:21,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 34 states have internal predecessors, (35), 18 states have call successors, (18), 5 states have call predecessors, (18), 5 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-19 07:48:21,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2023-11-19 07:48:21,514 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 45 [2023-11-19 07:48:21,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:21,515 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2023-11-19 07:48:21,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-19 07:48:21,515 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2023-11-19 07:48:21,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-19 07:48:21,517 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:21,517 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:21,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:21,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:21,734 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:21,735 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:21,735 INFO L85 PathProgramCache]: Analyzing trace with hash -670274197, now seen corresponding path program 1 times [2023-11-19 07:48:21,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:21,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846325019] [2023-11-19 07:48:21,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:21,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:21,754 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:21,754 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1431734089] [2023-11-19 07:48:21,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:21,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:21,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:21,756 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:21,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 07:48:21,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:21,852 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 07:48:21,864 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:22,075 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-11-19 07:48:22,076 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:48:22,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:22,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846325019] [2023-11-19 07:48:22,077 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:22,077 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1431734089] [2023-11-19 07:48:22,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1431734089] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:48:22,077 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:48:22,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 07:48:22,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845639539] [2023-11-19 07:48:22,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:22,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 07:48:22,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:22,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 07:48:22,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 07:48:22,080 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 07:48:22,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:22,150 INFO L93 Difference]: Finished difference Result 62 states and 76 transitions. [2023-11-19 07:48:22,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 07:48:22,150 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2023-11-19 07:48:22,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:22,152 INFO L225 Difference]: With dead ends: 62 [2023-11-19 07:48:22,152 INFO L226 Difference]: Without dead ends: 60 [2023-11-19 07:48:22,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 07:48:22,153 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 7 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:22,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 132 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:48:22,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-19 07:48:22,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2023-11-19 07:48:22,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 37 states have internal predecessors, (38), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-19 07:48:22,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 73 transitions. [2023-11-19 07:48:22,172 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 73 transitions. Word has length 56 [2023-11-19 07:48:22,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:22,173 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 73 transitions. [2023-11-19 07:48:22,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 07:48:22,173 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 73 transitions. [2023-11-19 07:48:22,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-19 07:48:22,175 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:22,175 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:22,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:22,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:22,390 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:22,391 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:22,391 INFO L85 PathProgramCache]: Analyzing trace with hash 815241237, now seen corresponding path program 1 times [2023-11-19 07:48:22,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:22,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775594920] [2023-11-19 07:48:22,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:22,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:22,412 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:22,412 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [800253930] [2023-11-19 07:48:22,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:22,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:22,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:22,414 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:22,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 07:48:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:22,494 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 07:48:22,498 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:22,569 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-11-19 07:48:22,569 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:22,640 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2023-11-19 07:48:22,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:22,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775594920] [2023-11-19 07:48:22,641 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:22,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800253930] [2023-11-19 07:48:22,641 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800253930] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 07:48:22,641 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:48:22,641 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-11-19 07:48:22,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219935870] [2023-11-19 07:48:22,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:22,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 07:48:22,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:22,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 07:48:22,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:48:22,643 INFO L87 Difference]: Start difference. First operand 59 states and 73 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-19 07:48:22,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:22,704 INFO L93 Difference]: Finished difference Result 65 states and 78 transitions. [2023-11-19 07:48:22,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 07:48:22,705 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 63 [2023-11-19 07:48:22,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:22,707 INFO L225 Difference]: With dead ends: 65 [2023-11-19 07:48:22,707 INFO L226 Difference]: Without dead ends: 63 [2023-11-19 07:48:22,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 07:48:22,708 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 6 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:22,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 130 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:48:22,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-19 07:48:22,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2023-11-19 07:48:22,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 32 states have (on average 1.125) internal successors, (36), 33 states have internal predecessors, (36), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2023-11-19 07:48:22,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 67 transitions. [2023-11-19 07:48:22,727 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 67 transitions. Word has length 63 [2023-11-19 07:48:22,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:22,728 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 67 transitions. [2023-11-19 07:48:22,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-19 07:48:22,728 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 67 transitions. [2023-11-19 07:48:22,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2023-11-19 07:48:22,729 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:22,730 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:22,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:22,947 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:22,947 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:22,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:22,947 INFO L85 PathProgramCache]: Analyzing trace with hash -759965185, now seen corresponding path program 1 times [2023-11-19 07:48:22,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:22,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358671316] [2023-11-19 07:48:22,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:22,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:22,971 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:22,971 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2078324607] [2023-11-19 07:48:22,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:22,971 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:22,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:22,973 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:22,998 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 07:48:23,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:23,049 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 07:48:23,051 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:23,117 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2023-11-19 07:48:23,118 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:23,230 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 14 proven. 11 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2023-11-19 07:48:23,231 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:23,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358671316] [2023-11-19 07:48:23,232 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:23,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078324607] [2023-11-19 07:48:23,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078324607] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:48:23,232 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:48:23,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2023-11-19 07:48:23,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421450038] [2023-11-19 07:48:23,233 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:23,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 07:48:23,234 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:23,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 07:48:23,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-11-19 07:48:23,237 INFO L87 Difference]: Start difference. First operand 55 states and 67 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-19 07:48:23,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:23,441 INFO L93 Difference]: Finished difference Result 102 states and 142 transitions. [2023-11-19 07:48:23,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 07:48:23,442 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 65 [2023-11-19 07:48:23,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:23,445 INFO L225 Difference]: With dead ends: 102 [2023-11-19 07:48:23,446 INFO L226 Difference]: Without dead ends: 94 [2023-11-19 07:48:23,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 117 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2023-11-19 07:48:23,449 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 36 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:23,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 221 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:48:23,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-19 07:48:23,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 85. [2023-11-19 07:48:23,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 47 states have internal predecessors, (55), 32 states have call successors, (32), 6 states have call predecessors, (32), 6 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-11-19 07:48:23,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 118 transitions. [2023-11-19 07:48:23,508 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 118 transitions. Word has length 65 [2023-11-19 07:48:23,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:23,510 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 118 transitions. [2023-11-19 07:48:23,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-19 07:48:23,511 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 118 transitions. [2023-11-19 07:48:23,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-19 07:48:23,513 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:23,513 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:23,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:23,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:23,738 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:23,739 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:23,739 INFO L85 PathProgramCache]: Analyzing trace with hash -696294669, now seen corresponding path program 1 times [2023-11-19 07:48:23,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:23,739 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552445653] [2023-11-19 07:48:23,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:23,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:23,755 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:23,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [259131588] [2023-11-19 07:48:23,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:23,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:23,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:23,756 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:23,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 07:48:23,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:23,837 INFO L262 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-19 07:48:23,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:24,312 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 19 proven. 23 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-11-19 07:48:24,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:24,570 INFO L134 CoverageAnalysis]: Checked inductivity of 115 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-19 07:48:24,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:24,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552445653] [2023-11-19 07:48:24,571 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:24,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259131588] [2023-11-19 07:48:24,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259131588] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:48:24,572 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:48:24,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 17 [2023-11-19 07:48:24,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590967974] [2023-11-19 07:48:24,572 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:24,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 07:48:24,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:24,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 07:48:24,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2023-11-19 07:48:24,575 INFO L87 Difference]: Start difference. First operand 85 states and 118 transitions. Second operand has 17 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 9 states have call successors, (21) [2023-11-19 07:48:25,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:25,711 INFO L93 Difference]: Finished difference Result 120 states and 169 transitions. [2023-11-19 07:48:25,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-11-19 07:48:25,714 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 9 states have call successors, (21) Word has length 71 [2023-11-19 07:48:25,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:25,718 INFO L225 Difference]: With dead ends: 120 [2023-11-19 07:48:25,718 INFO L226 Difference]: Without dead ends: 117 [2023-11-19 07:48:25,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 123 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=147, Invalid=503, Unknown=0, NotChecked=0, Total=650 [2023-11-19 07:48:25,721 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 66 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:25,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 330 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 07:48:25,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-19 07:48:25,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 114. [2023-11-19 07:48:25,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 61 states have (on average 1.2131147540983607) internal successors, (74), 63 states have internal predecessors, (74), 45 states have call successors, (45), 7 states have call predecessors, (45), 7 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2023-11-19 07:48:25,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 162 transitions. [2023-11-19 07:48:25,792 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 162 transitions. Word has length 71 [2023-11-19 07:48:25,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:25,792 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 162 transitions. [2023-11-19 07:48:25,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.2) internal successors, (33), 13 states have internal predecessors, (33), 9 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 10 states have call predecessors, (21), 9 states have call successors, (21) [2023-11-19 07:48:25,793 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 162 transitions. [2023-11-19 07:48:25,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-11-19 07:48:25,797 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:25,797 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:25,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:26,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:26,010 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:26,011 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:26,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1352497678, now seen corresponding path program 2 times [2023-11-19 07:48:26,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:26,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918810679] [2023-11-19 07:48:26,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:26,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:26,033 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:26,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1217851674] [2023-11-19 07:48:26,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-19 07:48:26,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:26,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:26,040 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:26,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 07:48:26,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-19 07:48:26,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 07:48:26,128 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-19 07:48:26,131 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:26,681 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 18 proven. 24 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-11-19 07:48:26,681 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:26,945 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2023-11-19 07:48:26,946 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:26,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918810679] [2023-11-19 07:48:26,946 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:26,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217851674] [2023-11-19 07:48:26,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217851674] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:48:26,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:48:26,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 16 [2023-11-19 07:48:26,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123224120] [2023-11-19 07:48:26,949 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:26,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 07:48:26,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:26,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 07:48:26,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2023-11-19 07:48:26,954 INFO L87 Difference]: Start difference. First operand 114 states and 162 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 8 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 9 states have call predecessors, (24), 8 states have call successors, (24) [2023-11-19 07:48:28,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:28,229 INFO L93 Difference]: Finished difference Result 239 states and 361 transitions. [2023-11-19 07:48:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-19 07:48:28,230 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 8 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 9 states have call predecessors, (24), 8 states have call successors, (24) Word has length 76 [2023-11-19 07:48:28,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:28,233 INFO L225 Difference]: With dead ends: 239 [2023-11-19 07:48:28,233 INFO L226 Difference]: Without dead ends: 237 [2023-11-19 07:48:28,234 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2023-11-19 07:48:28,235 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 96 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 271 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:28,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 289 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 271 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 07:48:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2023-11-19 07:48:28,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 206. [2023-11-19 07:48:28,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 111 states have (on average 1.2522522522522523) internal successors, (139), 113 states have internal predecessors, (139), 85 states have call successors, (85), 9 states have call predecessors, (85), 9 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) [2023-11-19 07:48:28,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 307 transitions. [2023-11-19 07:48:28,333 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 307 transitions. Word has length 76 [2023-11-19 07:48:28,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:28,333 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 307 transitions. [2023-11-19 07:48:28,334 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 8 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 9 states have call predecessors, (24), 8 states have call successors, (24) [2023-11-19 07:48:28,334 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 307 transitions. [2023-11-19 07:48:28,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-11-19 07:48:28,335 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:28,335 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:28,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:28,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:28,561 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:28,561 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:28,561 INFO L85 PathProgramCache]: Analyzing trace with hash -421153901, now seen corresponding path program 3 times [2023-11-19 07:48:28,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:28,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579881783] [2023-11-19 07:48:28,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:28,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:28,577 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:28,578 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1671235230] [2023-11-19 07:48:28,578 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 07:48:28,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:28,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:28,579 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:28,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 07:48:28,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 07:48:28,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 07:48:28,695 INFO L262 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 44 conjunts are in the unsatisfiable core [2023-11-19 07:48:28,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:29,713 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 43 proven. 20 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-19 07:48:29,713 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:30,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:30,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579881783] [2023-11-19 07:48:30,748 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:30,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671235230] [2023-11-19 07:48:30,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671235230] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 07:48:30,748 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-19 07:48:30,748 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2023-11-19 07:48:30,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256812657] [2023-11-19 07:48:30,749 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:30,749 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 07:48:30,749 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:30,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 07:48:30,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2023-11-19 07:48:30,751 INFO L87 Difference]: Start difference. First operand 206 states and 307 transitions. Second operand has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2023-11-19 07:48:31,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:31,454 INFO L93 Difference]: Finished difference Result 217 states and 316 transitions. [2023-11-19 07:48:31,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 07:48:31,454 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) Word has length 81 [2023-11-19 07:48:31,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:31,457 INFO L225 Difference]: With dead ends: 217 [2023-11-19 07:48:31,457 INFO L226 Difference]: Without dead ends: 215 [2023-11-19 07:48:31,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=111, Invalid=645, Unknown=0, NotChecked=0, Total=756 [2023-11-19 07:48:31,458 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 42 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:31,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 330 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 07:48:31,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2023-11-19 07:48:31,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2023-11-19 07:48:31,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 117 states have (on average 1.2393162393162394) internal successors, (145), 119 states have internal predecessors, (145), 85 states have call successors, (85), 11 states have call predecessors, (85), 11 states have return successors, (83), 83 states have call predecessors, (83), 83 states have call successors, (83) [2023-11-19 07:48:31,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 313 transitions. [2023-11-19 07:48:31,528 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 313 transitions. Word has length 81 [2023-11-19 07:48:31,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:31,529 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 313 transitions. [2023-11-19 07:48:31,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2023-11-19 07:48:31,530 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 313 transitions. [2023-11-19 07:48:31,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-19 07:48:31,531 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:31,531 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:31,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:31,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 07:48:31,735 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:31,735 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:31,735 INFO L85 PathProgramCache]: Analyzing trace with hash -1712962370, now seen corresponding path program 1 times [2023-11-19 07:48:31,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:31,735 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325888304] [2023-11-19 07:48:31,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:31,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:31,751 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:31,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [209850154] [2023-11-19 07:48:31,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:31,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:31,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:31,752 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:31,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 07:48:31,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:31,844 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-19 07:48:31,848 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:32,526 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 22 proven. 17 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2023-11-19 07:48:32,527 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:48:33,357 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2023-11-19 07:48:33,358 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:33,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325888304] [2023-11-19 07:48:33,359 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:33,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209850154] [2023-11-19 07:48:33,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209850154] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:48:33,359 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:48:33,359 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 21 [2023-11-19 07:48:33,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354590708] [2023-11-19 07:48:33,359 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:48:33,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-19 07:48:33,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:33,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-19 07:48:33,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2023-11-19 07:48:33,362 INFO L87 Difference]: Start difference. First operand 214 states and 313 transitions. Second operand has 21 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-11-19 07:48:37,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:37,060 INFO L93 Difference]: Finished difference Result 340 states and 514 transitions. [2023-11-19 07:48:37,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-19 07:48:37,061 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 87 [2023-11-19 07:48:37,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:37,064 INFO L225 Difference]: With dead ends: 340 [2023-11-19 07:48:37,064 INFO L226 Difference]: Without dead ends: 336 [2023-11-19 07:48:37,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=309, Invalid=1413, Unknown=0, NotChecked=0, Total=1722 [2023-11-19 07:48:37,067 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 98 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 523 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 491 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 523 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:37,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 491 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 523 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-11-19 07:48:37,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2023-11-19 07:48:37,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 332. [2023-11-19 07:48:37,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 175 states have (on average 1.2685714285714285) internal successors, (222), 178 states have internal predecessors, (222), 142 states have call successors, (142), 14 states have call predecessors, (142), 14 states have return successors, (140), 139 states have call predecessors, (140), 140 states have call successors, (140) [2023-11-19 07:48:37,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 504 transitions. [2023-11-19 07:48:37,286 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 504 transitions. Word has length 87 [2023-11-19 07:48:37,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:37,286 INFO L495 AbstractCegarLoop]: Abstraction has 332 states and 504 transitions. [2023-11-19 07:48:37,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2023-11-19 07:48:37,287 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 504 transitions. [2023-11-19 07:48:37,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-11-19 07:48:37,288 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:37,288 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 6, 6, 6, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:37,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:37,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-19 07:48:37,502 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:37,502 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:37,502 INFO L85 PathProgramCache]: Analyzing trace with hash 1006372811, now seen corresponding path program 4 times [2023-11-19 07:48:37,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:37,503 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311270034] [2023-11-19 07:48:37,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:37,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:37,516 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:37,516 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1101362732] [2023-11-19 07:48:37,516 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 07:48:37,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:37,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:37,517 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:37,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 07:48:37,597 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 07:48:37,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 07:48:37,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 07:48:37,601 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:37,645 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2023-11-19 07:48:37,645 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 07:48:37,646 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:48:37,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311270034] [2023-11-19 07:48:37,646 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:48:37,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101362732] [2023-11-19 07:48:37,646 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101362732] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:48:37,646 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:48:37,646 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 07:48:37,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202293665] [2023-11-19 07:48:37,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:48:37,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 07:48:37,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:48:37,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 07:48:37,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 07:48:37,648 INFO L87 Difference]: Start difference. First operand 332 states and 504 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 07:48:37,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:48:37,823 INFO L93 Difference]: Finished difference Result 401 states and 605 transitions. [2023-11-19 07:48:37,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 07:48:37,825 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 96 [2023-11-19 07:48:37,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:48:37,827 INFO L225 Difference]: With dead ends: 401 [2023-11-19 07:48:37,828 INFO L226 Difference]: Without dead ends: 230 [2023-11-19 07:48:37,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:48:37,831 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 7 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:48:37,831 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 168 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:48:37,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2023-11-19 07:48:37,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 218. [2023-11-19 07:48:37,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 113 states have (on average 1.1858407079646018) internal successors, (134), 116 states have internal predecessors, (134), 90 states have call successors, (90), 14 states have call predecessors, (90), 14 states have return successors, (88), 87 states have call predecessors, (88), 88 states have call successors, (88) [2023-11-19 07:48:37,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 312 transitions. [2023-11-19 07:48:37,980 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 312 transitions. Word has length 96 [2023-11-19 07:48:37,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:48:37,981 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 312 transitions. [2023-11-19 07:48:37,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2023-11-19 07:48:37,982 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 312 transitions. [2023-11-19 07:48:37,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-19 07:48:37,984 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:48:37,984 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:48:38,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 07:48:38,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 07:48:38,196 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:48:38,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:48:38,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1899970478, now seen corresponding path program 1 times [2023-11-19 07:48:38,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:48:38,196 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423238152] [2023-11-19 07:48:38,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:38,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:48:38,208 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 07:48:38,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1621007667] [2023-11-19 07:48:38,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:48:38,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 07:48:38,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:48:38,210 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 07:48:38,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78f0a0b2-50dd-45cc-8fe0-fab882714730/bin/uautomizer-verify-uCwYo4JHxu/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-19 07:48:38,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:48:38,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 56 conjunts are in the unsatisfiable core [2023-11-19 07:48:38,299 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 07:48:39,530 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 74 proven. 35 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2023-11-19 07:48:39,531 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 07:49:08,487 INFO L134 CoverageAnalysis]: Checked inductivity of 320 backedges. 68 proven. 26 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2023-11-19 07:49:08,487 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:49:08,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423238152] [2023-11-19 07:49:08,488 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 07:49:08,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621007667] [2023-11-19 07:49:08,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621007667] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 07:49:08,488 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 07:49:08,488 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 25 [2023-11-19 07:49:08,489 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454182792] [2023-11-19 07:49:08,489 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 07:49:08,489 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 07:49:08,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:49:08,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 07:49:08,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=487, Unknown=1, NotChecked=0, Total=600 [2023-11-19 07:49:08,491 INFO L87 Difference]: Start difference. First operand 218 states and 312 transitions. Second operand has 25 states, 24 states have (on average 1.8333333333333333) internal successors, (44), 21 states have internal predecessors, (44), 11 states have call successors, (33), 3 states have call predecessors, (33), 3 states have return successors, (32), 12 states have call predecessors, (32), 10 states have call successors, (32) [2023-11-19 07:49:14,258 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []