./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 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_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ --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 36da946a83103a61b88f0f1db9af94484aad5eefbde5313f974f53b267bd14bf --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 22:25:11,922 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 22:25:12,078 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-23 22:25:12,088 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 22:25:12,090 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 22:25:12,136 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 22:25:12,137 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 22:25:12,137 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 22:25:12,139 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-23 22:25:12,145 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-23 22:25:12,145 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 22:25:12,146 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 22:25:12,147 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 22:25:12,149 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 22:25:12,149 INFO L153 SettingsManager]: * Use SBE=true [2023-11-23 22:25:12,150 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 22:25:12,151 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 22:25:12,151 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 22:25:12,152 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 22:25:12,152 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 22:25:12,153 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 22:25:12,157 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 22:25:12,157 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 22:25:12,158 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 22:25:12,158 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 22:25:12,159 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 22:25:12,159 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 22:25:12,160 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 22:25:12,161 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-23 22:25:12,161 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 22:25:12,163 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 22:25:12,164 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 22:25:12,164 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 22:25:12,164 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 22:25:12,165 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 22:25:12,165 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-23 22:25:12,165 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 22:25:12,165 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 22:25:12,166 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-23 22:25:12,166 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 22:25:12,166 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-23 22:25:12,167 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 22:25:12,167 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_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 36da946a83103a61b88f0f1db9af94484aad5eefbde5313f974f53b267bd14bf [2023-11-23 22:25:12,526 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 22:25:12,567 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 22:25:12,570 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 22:25:12,572 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 22:25:12,573 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 22:25:12,574 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/../../sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c [2023-11-23 22:25:15,717 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 22:25:15,931 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 22:25:15,932 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c [2023-11-23 22:25:15,942 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/data/04faa781f/4044d18c49584815969532564781591b/FLAG8f06e293a [2023-11-23 22:25:15,962 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/data/04faa781f/4044d18c49584815969532564781591b [2023-11-23 22:25:15,970 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 22:25:15,972 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 22:25:15,981 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 22:25:15,981 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 22:25:15,990 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 22:25:15,991 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:25:15" (1/1) ... [2023-11-23 22:25:15,992 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@360babe3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:15, skipping insertion in model container [2023-11-23 22:25:15,992 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:25:15" (1/1) ... [2023-11-23 22:25:16,021 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 22:25:16,244 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_44e1633a-290d-4eea-a127-5e5cfd942a89/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c[524,537] [2023-11-23 22:25:16,277 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 22:25:16,291 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 22:25:16,312 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_44e1633a-290d-4eea-a127-5e5cfd942a89/sv-benchmarks/c/nla-digbench-scaling/fermat2-ll_unwindbound100.c[524,537] [2023-11-23 22:25:16,340 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 22:25:16,361 INFO L206 MainTranslator]: Completed translation [2023-11-23 22:25:16,362 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16 WrapperNode [2023-11-23 22:25:16,362 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 22:25:16,364 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 22:25:16,364 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 22:25:16,365 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 22:25:16,374 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,385 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,414 INFO L138 Inliner]: procedures = 14, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 47 [2023-11-23 22:25:16,415 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 22:25:16,415 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 22:25:16,416 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 22:25:16,416 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 22:25:16,429 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,430 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,440 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,462 INFO L189 HeapSplitter]: Split 2 memory accesses to 1 slices as follows [2] [2023-11-23 22:25:16,463 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,463 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,476 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,480 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,487 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,488 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,490 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 22:25:16,503 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 22:25:16,503 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 22:25:16,503 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 22:25:16,504 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (1/1) ... [2023-11-23 22:25:16,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 22:25:16,527 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:16,545 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 22:25:16,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 22:25:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 22:25:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 22:25:16,603 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 22:25:16,603 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-23 22:25:16,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 22:25:16,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 22:25:16,604 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 22:25:16,606 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 22:25:16,704 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 22:25:16,707 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 22:25:16,917 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 22:25:16,959 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 22:25:16,959 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 22:25:16,960 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:25:16 BoogieIcfgContainer [2023-11-23 22:25:16,960 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 22:25:16,964 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 22:25:16,964 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 22:25:16,968 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 22:25:16,969 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 10:25:15" (1/3) ... [2023-11-23 22:25:16,970 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5121e1d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:25:16, skipping insertion in model container [2023-11-23 22:25:16,970 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:25:16" (2/3) ... [2023-11-23 22:25:16,971 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5121e1d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:25:16, skipping insertion in model container [2023-11-23 22:25:16,971 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:25:16" (3/3) ... [2023-11-23 22:25:16,972 INFO L112 eAbstractionObserver]: Analyzing ICFG fermat2-ll_unwindbound100.c [2023-11-23 22:25:16,997 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 22:25:16,998 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 22:25:17,067 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 22:25:17,074 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;@56ecebbf, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 22:25:17,086 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 22:25:17,097 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 22:25:17,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 22:25:17,105 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:17,106 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:17,107 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:17,112 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:17,112 INFO L85 PathProgramCache]: Analyzing trace with hash -1060579028, now seen corresponding path program 1 times [2023-11-23 22:25:17,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:17,123 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719584709] [2023-11-23 22:25:17,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:17,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:17,223 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:17,224 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [637373193] [2023-11-23 22:25:17,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:17,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:17,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:17,227 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:17,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 22:25:17,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 22:25:17,352 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 22:25:17,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:17,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 22:25:17,380 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 22:25:17,380 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:17,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719584709] [2023-11-23 22:25:17,381 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:17,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637373193] [2023-11-23 22:25:17,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637373193] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 22:25:17,382 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 22:25:17,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 22:25:17,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418248701] [2023-11-23 22:25:17,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 22:25:17,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-23 22:25:17,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:17,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-23 22:25:17,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 22:25:17,423 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 22:25:17,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:17,451 INFO L93 Difference]: Finished difference Result 42 states and 59 transitions. [2023-11-23 22:25:17,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-23 22:25:17,454 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-11-23 22:25:17,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:17,462 INFO L225 Difference]: With dead ends: 42 [2023-11-23 22:25:17,462 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 22:25:17,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 22:25:17,469 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:17,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 22:25:17,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 22:25:17,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 22:25:17,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 22:25:17,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-23 22:25:17,541 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 17 [2023-11-23 22:25:17,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:17,542 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-23 22:25:17,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 22:25:17,543 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-23 22:25:17,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 22:25:17,545 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:17,545 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:17,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:17,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:17,749 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:17,750 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:17,750 INFO L85 PathProgramCache]: Analyzing trace with hash -778881514, now seen corresponding path program 1 times [2023-11-23 22:25:17,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:17,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598146600] [2023-11-23 22:25:17,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:17,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:17,767 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:17,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [135225678] [2023-11-23 22:25:17,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:17,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:17,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:17,770 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:17,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 22:25:17,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 22:25:17,864 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 22:25:17,866 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:17,951 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 22:25:17,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:17,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598146600] [2023-11-23 22:25:17,952 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:17,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135225678] [2023-11-23 22:25:17,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135225678] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 22:25:17,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 22:25:17,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 22:25:17,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287280080] [2023-11-23 22:25:17,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 22:25:17,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 22:25:17,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:17,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 22:25:17,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 22:25:17,958 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 22:25:17,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:17,987 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-11-23 22:25:17,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 22:25:17,988 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-11-23 22:25:17,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:17,991 INFO L225 Difference]: With dead ends: 29 [2023-11-23 22:25:17,992 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 22:25:17,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 22:25:17,999 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:18,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 54 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 22:25:18,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 22:25:18,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-23 22:25:18,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 22:25:18,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2023-11-23 22:25:18,018 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2023-11-23 22:25:18,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:18,019 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2023-11-23 22:25:18,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 22:25:18,019 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2023-11-23 22:25:18,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 22:25:18,020 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:18,020 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:18,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:18,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:18,221 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:18,222 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:18,222 INFO L85 PathProgramCache]: Analyzing trace with hash -777094054, now seen corresponding path program 1 times [2023-11-23 22:25:18,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:18,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971767635] [2023-11-23 22:25:18,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:18,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:18,237 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:18,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [980164592] [2023-11-23 22:25:18,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:18,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:18,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:18,239 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:18,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 22:25:18,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 22:25:18,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 22:25:18,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:18,572 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:18,573 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 22:25:18,573 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:18,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971767635] [2023-11-23 22:25:18,573 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:18,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980164592] [2023-11-23 22:25:18,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980164592] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 22:25:18,574 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 22:25:18,575 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 22:25:18,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777859365] [2023-11-23 22:25:18,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 22:25:18,576 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 22:25:18,576 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:18,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 22:25:18,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 22:25:18,577 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 22:25:20,686 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-23 22:25:20,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:20,720 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2023-11-23 22:25:20,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 22:25:20,721 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2023-11-23 22:25:20,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:20,723 INFO L225 Difference]: With dead ends: 32 [2023-11-23 22:25:20,723 INFO L226 Difference]: Without dead ends: 30 [2023-11-23 22:25:20,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 22:25:20,726 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 7 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:20,726 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 62 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2023-11-23 22:25:20,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-23 22:25:20,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 27. [2023-11-23 22:25:20,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 20 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 22:25:20,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2023-11-23 22:25:20,737 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 18 [2023-11-23 22:25:20,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:20,738 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2023-11-23 22:25:20,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 22:25:20,739 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2023-11-23 22:25:20,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 22:25:20,740 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:20,740 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:20,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:20,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:20,973 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:20,973 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:20,973 INFO L85 PathProgramCache]: Analyzing trace with hash -331201790, now seen corresponding path program 1 times [2023-11-23 22:25:20,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:20,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217902390] [2023-11-23 22:25:20,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:20,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:20,986 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:20,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1981274362] [2023-11-23 22:25:20,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:20,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:20,987 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:20,988 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:20,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 22:25:21,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 22:25:21,060 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 22:25:21,062 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:21,210 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:21,211 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:21,390 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:21,391 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:21,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217902390] [2023-11-23 22:25:21,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:21,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981274362] [2023-11-23 22:25:21,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981274362] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:21,392 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:21,392 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2023-11-23 22:25:21,392 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995341802] [2023-11-23 22:25:21,392 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:21,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 22:25:21,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:21,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 22:25:21,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2023-11-23 22:25:21,394 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-23 22:25:21,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:21,556 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2023-11-23 22:25:21,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 22:25:21,558 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) Word has length 24 [2023-11-23 22:25:21,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:21,563 INFO L225 Difference]: With dead ends: 34 [2023-11-23 22:25:21,563 INFO L226 Difference]: Without dead ends: 29 [2023-11-23 22:25:21,565 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-11-23 22:25:21,567 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:21,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 80 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 22:25:21,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-23 22:25:21,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 24. [2023-11-23 22:25:21,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 22:25:21,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-11-23 22:25:21,587 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 24 [2023-11-23 22:25:21,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:21,587 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-11-23 22:25:21,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-23 22:25:21,588 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-11-23 22:25:21,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 22:25:21,589 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:21,589 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:21,612 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:21,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-23 22:25:21,805 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:21,805 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:21,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1584280999, now seen corresponding path program 1 times [2023-11-23 22:25:21,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:21,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129402522] [2023-11-23 22:25:21,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:21,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:21,819 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:21,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [582621759] [2023-11-23 22:25:21,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:21,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:21,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:21,822 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:21,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 22:25:21,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 22:25:21,890 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 22:25:21,897 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:21,972 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:22,025 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:22,026 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:22,026 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129402522] [2023-11-23 22:25:22,031 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:22,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582621759] [2023-11-23 22:25:22,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582621759] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:22,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:22,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-23 22:25:22,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709171918] [2023-11-23 22:25:22,032 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:22,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 22:25:22,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:22,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 22:25:22,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-11-23 22:25:22,036 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 22:25:22,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:22,156 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2023-11-23 22:25:22,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 22:25:22,157 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 27 [2023-11-23 22:25:22,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:22,161 INFO L225 Difference]: With dead ends: 56 [2023-11-23 22:25:22,161 INFO L226 Difference]: Without dead ends: 51 [2023-11-23 22:25:22,162 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2023-11-23 22:25:22,166 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 15 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:22,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 100 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 22:25:22,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-23 22:25:22,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-23 22:25:22,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 38 states have (on average 1.131578947368421) internal successors, (43), 38 states have internal predecessors, (43), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 22:25:22,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2023-11-23 22:25:22,211 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 27 [2023-11-23 22:25:22,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:22,212 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2023-11-23 22:25:22,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 5 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 22:25:22,212 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2023-11-23 22:25:22,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-23 22:25:22,216 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:22,217 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:22,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:22,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:22,433 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:22,433 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:22,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1262136106, now seen corresponding path program 2 times [2023-11-23 22:25:22,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:22,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198793574] [2023-11-23 22:25:22,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:22,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:22,448 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:22,448 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1590970816] [2023-11-23 22:25:22,448 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-23 22:25:22,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:22,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:22,450 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:22,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 22:25:22,526 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-23 22:25:22,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 22:25:22,528 INFO L262 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 22:25:22,532 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:22,659 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 62 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:22,660 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:22,826 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 22:25:22,826 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:22,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198793574] [2023-11-23 22:25:22,826 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:22,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590970816] [2023-11-23 22:25:22,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590970816] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:22,827 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:22,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14 [2023-11-23 22:25:22,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205373599] [2023-11-23 22:25:22,827 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:22,828 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 22:25:22,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:22,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 22:25:22,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2023-11-23 22:25:22,830 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-11-23 22:25:23,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:23,099 INFO L93 Difference]: Finished difference Result 110 states and 126 transitions. [2023-11-23 22:25:23,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 22:25:23,100 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) Word has length 54 [2023-11-23 22:25:23,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:23,104 INFO L225 Difference]: With dead ends: 110 [2023-11-23 22:25:23,104 INFO L226 Difference]: Without dead ends: 105 [2023-11-23 22:25:23,105 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2023-11-23 22:25:23,107 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 46 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:23,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 121 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 22:25:23,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-23 22:25:23,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2023-11-23 22:25:23,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 80 states have (on average 1.1375) internal successors, (91), 80 states have internal predecessors, (91), 13 states have call successors, (13), 12 states have call predecessors, (13), 11 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2023-11-23 22:25:23,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 116 transitions. [2023-11-23 22:25:23,151 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 116 transitions. Word has length 54 [2023-11-23 22:25:23,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:23,151 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 116 transitions. [2023-11-23 22:25:23,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.571428571428571) internal successors, (64), 14 states have internal predecessors, (64), 11 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (12), 10 states have call predecessors, (12), 10 states have call successors, (12) [2023-11-23 22:25:23,152 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 116 transitions. [2023-11-23 22:25:23,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-23 22:25:23,154 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:23,154 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:23,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-23 22:25:23,370 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:23,370 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:23,371 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:23,371 INFO L85 PathProgramCache]: Analyzing trace with hash -254685450, now seen corresponding path program 3 times [2023-11-23 22:25:23,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:23,371 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [517916985] [2023-11-23 22:25:23,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:23,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:23,388 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:23,388 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [569347526] [2023-11-23 22:25:23,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 22:25:23,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:23,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:23,389 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:23,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 22:25:23,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-11-23 22:25:23,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 22:25:23,614 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 22:25:23,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:23,956 INFO L134 CoverageAnalysis]: Checked inductivity of 449 backedges. 20 proven. 425 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:23,956 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:24,351 INFO L134 CoverageAnalysis]: Checked inductivity of 449 backedges. 20 proven. 245 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2023-11-23 22:25:24,351 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:24,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [517916985] [2023-11-23 22:25:24,352 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:24,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569347526] [2023-11-23 22:25:24,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569347526] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:24,352 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:24,352 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 26 [2023-11-23 22:25:24,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512816272] [2023-11-23 22:25:24,353 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:24,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-23 22:25:24,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:24,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-23 22:25:24,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=369, Unknown=0, NotChecked=0, Total=650 [2023-11-23 22:25:24,356 INFO L87 Difference]: Start difference. First operand 105 states and 116 transitions. Second operand has 26 states, 26 states have (on average 5.0) internal successors, (130), 26 states have internal predecessors, (130), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2023-11-23 22:25:24,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:24,981 INFO L93 Difference]: Finished difference Result 218 states and 252 transitions. [2023-11-23 22:25:24,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-11-23 22:25:24,982 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.0) internal successors, (130), 26 states have internal predecessors, (130), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) Word has length 108 [2023-11-23 22:25:24,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:24,985 INFO L225 Difference]: With dead ends: 218 [2023-11-23 22:25:24,985 INFO L226 Difference]: Without dead ends: 213 [2023-11-23 22:25:24,987 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=796, Invalid=1366, Unknown=0, NotChecked=0, Total=2162 [2023-11-23 22:25:24,988 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 131 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:24,988 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [131 Valid, 216 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 22:25:24,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2023-11-23 22:25:25,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2023-11-23 22:25:25,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 164 states have (on average 1.1402439024390243) internal successors, (187), 164 states have internal predecessors, (187), 25 states have call successors, (25), 24 states have call predecessors, (25), 23 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-23 22:25:25,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 236 transitions. [2023-11-23 22:25:25,066 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 236 transitions. Word has length 108 [2023-11-23 22:25:25,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:25,067 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 236 transitions. [2023-11-23 22:25:25,067 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.0) internal successors, (130), 26 states have internal predecessors, (130), 23 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2023-11-23 22:25:25,067 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 236 transitions. [2023-11-23 22:25:25,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2023-11-23 22:25:25,070 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:25,071 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 22, 22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:25,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:25,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:25,277 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:25,277 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:25,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1987984182, now seen corresponding path program 4 times [2023-11-23 22:25:25,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:25,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353125943] [2023-11-23 22:25:25,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:25,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:25,314 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:25,315 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1533038091] [2023-11-23 22:25:25,315 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 22:25:25,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:25,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:25,316 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:25,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 22:25:25,478 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 22:25:25,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 22:25:25,482 INFO L262 TraceCheckSpWp]: Trace formula consists of 505 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 22:25:25,491 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:26,109 INFO L134 CoverageAnalysis]: Checked inductivity of 2171 backedges. 44 proven. 2123 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:26,109 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:27,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2171 backedges. 44 proven. 1199 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2023-11-23 22:25:27,275 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:27,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353125943] [2023-11-23 22:25:27,275 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:27,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533038091] [2023-11-23 22:25:27,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533038091] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:27,276 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:27,276 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26] total 50 [2023-11-23 22:25:27,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633806331] [2023-11-23 22:25:27,276 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:27,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-11-23 22:25:27,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:27,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-11-23 22:25:27,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=1317, Unknown=0, NotChecked=0, Total=2450 [2023-11-23 22:25:27,283 INFO L87 Difference]: Start difference. First operand 213 states and 236 transitions. Second operand has 50 states, 50 states have (on average 5.24) internal successors, (262), 50 states have internal predecessors, (262), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-11-23 22:25:29,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:29,238 INFO L93 Difference]: Finished difference Result 434 states and 504 transitions. [2023-11-23 22:25:29,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2023-11-23 22:25:29,239 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.24) internal successors, (262), 50 states have internal predecessors, (262), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) Word has length 216 [2023-11-23 22:25:29,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:29,251 INFO L225 Difference]: With dead ends: 434 [2023-11-23 22:25:29,251 INFO L226 Difference]: Without dead ends: 429 [2023-11-23 22:25:29,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 382 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1288 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3316, Invalid=5614, Unknown=0, NotChecked=0, Total=8930 [2023-11-23 22:25:29,258 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 361 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:29,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 337 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 22:25:29,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2023-11-23 22:25:29,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 429. [2023-11-23 22:25:29,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 332 states have (on average 1.141566265060241) internal successors, (379), 332 states have internal predecessors, (379), 49 states have call successors, (49), 48 states have call predecessors, (49), 47 states have return successors, (48), 48 states have call predecessors, (48), 48 states have call successors, (48) [2023-11-23 22:25:29,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 476 transitions. [2023-11-23 22:25:29,357 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 476 transitions. Word has length 216 [2023-11-23 22:25:29,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:29,359 INFO L495 AbstractCegarLoop]: Abstraction has 429 states and 476 transitions. [2023-11-23 22:25:29,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.24) internal successors, (262), 50 states have internal predecessors, (262), 47 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-11-23 22:25:29,359 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 476 transitions. [2023-11-23 22:25:29,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2023-11-23 22:25:29,376 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:29,376 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 46, 46, 46, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:29,402 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:29,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:29,593 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:29,593 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:29,593 INFO L85 PathProgramCache]: Analyzing trace with hash 1235022774, now seen corresponding path program 5 times [2023-11-23 22:25:29,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:29,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506568329] [2023-11-23 22:25:29,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:29,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:29,630 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:29,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [410875646] [2023-11-23 22:25:29,630 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-23 22:25:29,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:29,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:29,631 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:29,634 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 22:25:31,195 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 47 check-sat command(s) [2023-11-23 22:25:31,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 22:25:31,206 INFO L262 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 95 conjunts are in the unsatisfiable core [2023-11-23 22:25:31,219 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 22:25:32,995 INFO L134 CoverageAnalysis]: Checked inductivity of 9503 backedges. 92 proven. 9407 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 22:25:32,996 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 22:25:36,914 INFO L134 CoverageAnalysis]: Checked inductivity of 9503 backedges. 92 proven. 5267 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2023-11-23 22:25:36,915 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-23 22:25:36,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506568329] [2023-11-23 22:25:36,915 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 22:25:36,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410875646] [2023-11-23 22:25:36,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410875646] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 22:25:36,916 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 22:25:36,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 50] total 98 [2023-11-23 22:25:36,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650767772] [2023-11-23 22:25:36,917 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 22:25:36,918 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2023-11-23 22:25:36,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-23 22:25:36,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2023-11-23 22:25:36,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4565, Invalid=4941, Unknown=0, NotChecked=0, Total=9506 [2023-11-23 22:25:36,928 INFO L87 Difference]: Start difference. First operand 429 states and 476 transitions. Second operand has 98 states, 98 states have (on average 5.36734693877551) internal successors, (526), 98 states have internal predecessors, (526), 95 states have call successors, (97), 49 states have call predecessors, (97), 48 states have return successors, (96), 94 states have call predecessors, (96), 94 states have call successors, (96) [2023-11-23 22:25:44,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 22:25:44,191 INFO L93 Difference]: Finished difference Result 866 states and 1008 transitions. [2023-11-23 22:25:44,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 190 states. [2023-11-23 22:25:44,192 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 5.36734693877551) internal successors, (526), 98 states have internal predecessors, (526), 95 states have call successors, (97), 49 states have call predecessors, (97), 48 states have return successors, (96), 94 states have call predecessors, (96), 94 states have call successors, (96) Word has length 432 [2023-11-23 22:25:44,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 22:25:44,201 INFO L225 Difference]: With dead ends: 866 [2023-11-23 22:25:44,201 INFO L226 Difference]: Without dead ends: 861 [2023-11-23 22:25:44,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 955 GetRequests, 766 SyntacticMatches, 0 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5452 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=13540, Invalid=22750, Unknown=0, NotChecked=0, Total=36290 [2023-11-23 22:25:44,217 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1163 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1163 SdHoareTripleChecker+Valid, 636 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 22:25:44,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1163 Valid, 636 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 22:25:44,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2023-11-23 22:25:44,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 861. [2023-11-23 22:25:44,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 668 states have (on average 1.1422155688622755) internal successors, (763), 668 states have internal predecessors, (763), 97 states have call successors, (97), 96 states have call predecessors, (97), 95 states have return successors, (96), 96 states have call predecessors, (96), 96 states have call successors, (96) [2023-11-23 22:25:44,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 956 transitions. [2023-11-23 22:25:44,358 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 956 transitions. Word has length 432 [2023-11-23 22:25:44,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 22:25:44,360 INFO L495 AbstractCegarLoop]: Abstraction has 861 states and 956 transitions. [2023-11-23 22:25:44,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 5.36734693877551) internal successors, (526), 98 states have internal predecessors, (526), 95 states have call successors, (97), 49 states have call predecessors, (97), 48 states have return successors, (96), 94 states have call predecessors, (96), 94 states have call successors, (96) [2023-11-23 22:25:44,361 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 956 transitions. [2023-11-23 22:25:44,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 865 [2023-11-23 22:25:44,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 22:25:44,390 INFO L195 NwaCegarLoop]: trace histogram [95, 95, 94, 94, 94, 94, 94, 94, 94, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 22:25:44,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 22:25:44,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:44,599 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 22:25:44,599 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 22:25:44,599 INFO L85 PathProgramCache]: Analyzing trace with hash -1364073290, now seen corresponding path program 6 times [2023-11-23 22:25:44,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-23 22:25:44,599 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271473815] [2023-11-23 22:25:44,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 22:25:44,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 22:25:44,657 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 22:25:44,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1291449445] [2023-11-23 22:25:44,658 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-11-23 22:25:44,658 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 22:25:44,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 [2023-11-23 22:25:44,659 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 22:25:44,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44e1633a-290d-4eea-a127-5e5cfd942a89/bin/uautomizer-verify-zZY32mL2XJ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process