./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/divbin2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench/divbin2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx --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 c7e3f11d23b462949b18ec2057853f57240b0651aa6fb66cf591585739df9d3e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 22:28:49,105 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 22:28:49,220 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-21 22:28:49,228 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 22:28:49,229 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 22:28:49,267 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 22:28:49,269 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 22:28:49,270 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 22:28:49,271 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-21 22:28:49,276 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-21 22:28:49,276 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 22:28:49,278 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 22:28:49,279 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 22:28:49,280 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 22:28:49,281 INFO L153 SettingsManager]: * Use SBE=true [2023-11-21 22:28:49,281 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 22:28:49,282 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 22:28:49,282 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 22:28:49,283 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 22:28:49,284 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 22:28:49,284 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 22:28:49,285 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 22:28:49,285 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 22:28:49,286 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 22:28:49,286 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 22:28:49,287 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 22:28:49,287 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 22:28:49,288 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 22:28:49,289 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-21 22:28:49,289 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 22:28:49,290 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 22:28:49,291 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:28:49,291 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 22:28:49,291 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 22:28:49,292 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 22:28:49,292 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-21 22:28:49,292 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 22:28:49,293 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 22:28:49,293 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-21 22:28:49,293 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 22:28:49,294 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-21 22:28:49,294 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 22:28:49,294 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_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c7e3f11d23b462949b18ec2057853f57240b0651aa6fb66cf591585739df9d3e [2023-11-21 22:28:49,599 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 22:28:49,629 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 22:28:49,634 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 22:28:49,635 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 22:28:49,636 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 22:28:49,637 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/nla-digbench/divbin2.i [2023-11-21 22:28:52,851 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 22:28:53,082 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 22:28:53,083 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/sv-benchmarks/c/nla-digbench/divbin2.i [2023-11-21 22:28:53,093 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/data/f5c2572cb/182e519ae7794934b4a22fdbd6aa7b0b/FLAGadd6fe4ea [2023-11-21 22:28:53,108 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/data/f5c2572cb/182e519ae7794934b4a22fdbd6aa7b0b [2023-11-21 22:28:53,111 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 22:28:53,113 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 22:28:53,115 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 22:28:53,115 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 22:28:53,122 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 22:28:53,123 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,125 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d28b2ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53, skipping insertion in model container [2023-11-21 22:28:53,125 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,153 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 22:28:53,326 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_ddac9722-7779-41fc-a0db-e5cefcc93e96/sv-benchmarks/c/nla-digbench/divbin2.i[951,964] [2023-11-21 22:28:53,343 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:28:53,356 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 22:28:53,372 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_ddac9722-7779-41fc-a0db-e5cefcc93e96/sv-benchmarks/c/nla-digbench/divbin2.i[951,964] [2023-11-21 22:28:53,378 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 22:28:53,395 INFO L206 MainTranslator]: Completed translation [2023-11-21 22:28:53,396 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53 WrapperNode [2023-11-21 22:28:53,396 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 22:28:53,398 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 22:28:53,398 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 22:28:53,399 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 22:28:53,406 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,414 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,431 INFO L138 Inliner]: procedures = 16, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2023-11-21 22:28:53,432 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 22:28:53,432 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 22:28:53,433 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 22:28:53,433 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 22:28:53,445 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,445 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,446 INFO L184 PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,456 INFO L187 HeapSplitter]: Split 2 memory accesses to 1 slices as follows [2] [2023-11-21 22:28:53,457 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,457 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,461 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,465 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,467 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,468 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,470 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 22:28:53,471 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 22:28:53,471 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 22:28:53,471 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 22:28:53,472 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (1/1) ... [2023-11-21 22:28:53,480 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 22:28:53,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:28:53,523 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 22:28:53,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 22:28:53,578 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 22:28:53,579 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-21 22:28:53,579 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 22:28:53,579 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 22:28:53,579 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-21 22:28:53,579 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-21 22:28:53,660 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 22:28:53,663 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 22:28:53,899 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 22:28:53,973 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 22:28:53,973 INFO L308 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-21 22:28:53,975 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:28:53 BoogieIcfgContainer [2023-11-21 22:28:53,975 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 22:28:53,981 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 22:28:53,981 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 22:28:53,985 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 22:28:53,985 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 10:28:53" (1/3) ... [2023-11-21 22:28:53,986 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15cc9141 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:28:53, skipping insertion in model container [2023-11-21 22:28:53,987 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 10:28:53" (2/3) ... [2023-11-21 22:28:53,990 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15cc9141 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 10:28:53, skipping insertion in model container [2023-11-21 22:28:53,990 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 10:28:53" (3/3) ... [2023-11-21 22:28:53,993 INFO L112 eAbstractionObserver]: Analyzing ICFG divbin2.i [2023-11-21 22:28:54,015 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 22:28:54,016 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 22:28:54,092 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 22:28:54,104 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;@517e1831, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 22:28:54,104 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 22:28:54,110 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:28:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 22:28:54,119 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:28:54,120 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:28:54,121 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:28:54,130 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:28:54,130 INFO L85 PathProgramCache]: Analyzing trace with hash 394474291, now seen corresponding path program 1 times [2023-11-21 22:28:54,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:28:54,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294541047] [2023-11-21 22:28:54,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:54,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:28:54,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:28:54,258 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:28:54,258 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294541047] [2023-11-21 22:28:54,259 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-21 22:28:54,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594387953] [2023-11-21 22:28:54,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:54,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:54,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:28:54,261 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:28:54,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 22:28:54,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:28:54,315 INFO L262 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-21 22:28:54,320 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:28:54,338 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:28:54,339 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:28:54,339 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594387953] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:28:54,339 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:28:54,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 22:28:54,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338197212] [2023-11-21 22:28:54,343 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:28:54,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-21 22:28:54,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:28:54,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-21 22:28:54,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 22:28:54,390 INFO L87 Difference]: Start difference. First operand has 15 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 22:28:54,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:28:54,429 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2023-11-21 22:28:54,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-21 22:28:54,432 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 22:28:54,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:28:54,438 INFO L225 Difference]: With dead ends: 27 [2023-11-21 22:28:54,439 INFO L226 Difference]: Without dead ends: 13 [2023-11-21 22:28:54,442 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 22:28:54,446 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:28:54,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 22:28:54,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-21 22:28:54,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-21 22:28:54,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:28:54,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-11-21 22:28:54,488 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2023-11-21 22:28:54,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:28:54,489 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-11-21 22:28:54,489 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 22:28:54,489 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-11-21 22:28:54,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 22:28:54,490 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:28:54,490 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:28:54,507 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 22:28:54,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-21 22:28:54,695 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:28:54,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:28:54,696 INFO L85 PathProgramCache]: Analyzing trace with hash -336588208, now seen corresponding path program 1 times [2023-11-21 22:28:54,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:28:54,697 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051627431] [2023-11-21 22:28:54,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:54,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:28:54,716 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:28:54,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [252750324] [2023-11-21 22:28:54,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:54,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:54,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:28:54,719 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:28:54,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 22:28:54,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:28:54,783 INFO L262 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-21 22:28:54,786 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:28:54,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:28:54,946 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:28:54,946 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:28:54,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051627431] [2023-11-21 22:28:54,946 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:28:54,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252750324] [2023-11-21 22:28:54,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252750324] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:28:54,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:28:54,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 22:28:54,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588300060] [2023-11-21 22:28:54,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:28:54,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 22:28:54,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:28:54,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 22:28:54,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 22:28:54,951 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 22:28:55,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:28:55,067 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-11-21 22:28:55,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 22:28:55,068 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 22:28:55,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:28:55,069 INFO L225 Difference]: With dead ends: 23 [2023-11-21 22:28:55,069 INFO L226 Difference]: Without dead ends: 20 [2023-11-21 22:28:55,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 22:28:55,071 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 22:28:55,072 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 30 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 22:28:55,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-21 22:28:55,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-21 22:28:55,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:28:55,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-21 22:28:55,081 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 8 [2023-11-21 22:28:55,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:28:55,081 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-21 22:28:55,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 22:28:55,082 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-21 22:28:55,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 22:28:55,083 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:28:55,083 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:28:55,105 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 22:28:55,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:55,284 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:28:55,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:28:55,285 INFO L85 PathProgramCache]: Analyzing trace with hash -610399175, now seen corresponding path program 1 times [2023-11-21 22:28:55,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:28:55,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264056320] [2023-11-21 22:28:55,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:55,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:28:55,300 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:28:55,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1540325039] [2023-11-21 22:28:55,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:55,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:55,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:28:55,302 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:28:55,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 22:28:55,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:28:55,374 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 22:28:55,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:28:55,419 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:28:55,419 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 22:28:55,419 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:28:55,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264056320] [2023-11-21 22:28:55,420 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:28:55,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540325039] [2023-11-21 22:28:55,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540325039] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 22:28:55,420 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 22:28:55,420 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 22:28:55,421 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088973229] [2023-11-21 22:28:55,421 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 22:28:55,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 22:28:55,421 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:28:55,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 22:28:55,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 22:28:55,423 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:28:55,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:28:55,451 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2023-11-21 22:28:55,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 22:28:55,452 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-11-21 22:28:55,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:28:55,453 INFO L225 Difference]: With dead ends: 35 [2023-11-21 22:28:55,453 INFO L226 Difference]: Without dead ends: 22 [2023-11-21 22:28:55,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 22:28:55,455 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 22:28:55,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 22:28:55,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-21 22:28:55,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-21 22:28:55,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:28:55,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-11-21 22:28:55,470 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2023-11-21 22:28:55,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:28:55,470 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-11-21 22:28:55,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 22:28:55,471 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-11-21 22:28:55,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 22:28:55,473 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:28:55,474 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 22:28:55,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 22:28:55,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:55,695 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:28:55,695 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:28:55,695 INFO L85 PathProgramCache]: Analyzing trace with hash -1053414114, now seen corresponding path program 1 times [2023-11-21 22:28:55,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:28:55,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670205643] [2023-11-21 22:28:55,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:55,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:28:55,709 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:28:55,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [78392574] [2023-11-21 22:28:55,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:28:55,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:28:55,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:28:55,715 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:28:55,734 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 22:28:55,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 22:28:55,824 INFO L262 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 22:28:55,828 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:28:56,154 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:28:56,154 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:29:00,939 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 22:29:00,940 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:29:00,940 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670205643] [2023-11-21 22:29:00,940 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:29:00,941 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78392574] [2023-11-21 22:29:00,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78392574] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 22:29:00,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:29:00,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2023-11-21 22:29:00,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995370475] [2023-11-21 22:29:00,942 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:29:00,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-21 22:29:00,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:29:00,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-21 22:29:00,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2023-11-21 22:29:00,949 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 13 states have internal predecessors, (24), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:29:03,663 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-21 22:29:06,129 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-11-21 22:29:07,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 22:29:07,569 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2023-11-21 22:29:07,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 22:29:07,570 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 13 states have internal predecessors, (24), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-11-21 22:29:07,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 22:29:07,572 INFO L225 Difference]: With dead ends: 55 [2023-11-21 22:29:07,572 INFO L226 Difference]: Without dead ends: 37 [2023-11-21 22:29:07,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2023-11-21 22:29:07,574 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 29 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 22 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.8s IncrementalHoareTripleChecker+Time [2023-11-21 22:29:07,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 68 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 96 Invalid, 2 Unknown, 0 Unchecked, 5.8s Time] [2023-11-21 22:29:07,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-21 22:29:07,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2023-11-21 22:29:07,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 22:29:07,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2023-11-21 22:29:07,587 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 17 [2023-11-21 22:29:07,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 22:29:07,588 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2023-11-21 22:29:07,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 13 states have internal predecessors, (24), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-21 22:29:07,588 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2023-11-21 22:29:07,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 22:29:07,589 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 22:29:07,589 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1] [2023-11-21 22:29:07,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 22:29:07,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:29:07,795 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 22:29:07,796 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 22:29:07,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1164517786, now seen corresponding path program 2 times [2023-11-21 22:29:07,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-21 22:29:07,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75046641] [2023-11-21 22:29:07,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 22:29:07,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 22:29:07,828 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-21 22:29:07,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1938218303] [2023-11-21 22:29:07,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-21 22:29:07,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 22:29:07,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 [2023-11-21 22:29:07,833 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 22:29:07,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ddac9722-7779-41fc-a0db-e5cefcc93e96/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 22:29:08,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-21 22:29:08,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 22:29:08,068 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-21 22:29:08,071 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 22:29:08,561 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 22:29:08,561 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 22:29:15,293 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 22:29:15,293 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-21 22:29:15,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75046641] [2023-11-21 22:29:15,293 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-21 22:29:15,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938218303] [2023-11-21 22:29:15,294 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938218303] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 22:29:15,294 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 22:29:15,294 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2023-11-21 22:29:15,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273346252] [2023-11-21 22:29:15,295 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 22:29:15,296 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-21 22:29:15,296 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-21 22:29:15,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-21 22:29:15,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2023-11-21 22:29:15,298 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4)