./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 87db985859a6b034137d18f88e4077536120341f1ad0cccc5267e9ee4379ce7a --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:47:48,158 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:47:48,269 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:47:48,278 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:47:48,279 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:47:48,329 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:47:48,330 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:47:48,330 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:47:48,331 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:47:48,332 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:47:48,332 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:47:48,333 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:47:48,333 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:47:48,334 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:47:48,334 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:47:48,335 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:47:48,336 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:47:48,336 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:47:48,336 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:47:48,337 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:47:48,337 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:47:48,339 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:47:48,340 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:47:48,341 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:47:48,342 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:47:48,342 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:47:48,342 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:47:48,343 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:47:48,343 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:47:48,344 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:47:48,345 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:47:48,345 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:47:48,346 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:47:48,346 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:47:48,359 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:47:48,359 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:47:48,360 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:47:48,360 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:47:48,360 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:47:48,360 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:47:48,361 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:47:48,361 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:47:48,361 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:47:48,361 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:47:48,362 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:47:48,362 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 87db985859a6b034137d18f88e4077536120341f1ad0cccc5267e9ee4379ce7a [2023-11-12 00:47:48,748 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:47:48,781 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:47:48,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:47:48,785 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:47:48,786 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:47:48,788 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c [2023-11-12 00:47:51,946 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:47:52,222 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:47:52,223 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c [2023-11-12 00:47:52,232 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/data/88c8d5e7c/87a84371f1bc474fabf24a45ee7e8932/FLAGed242f43c [2023-11-12 00:47:52,247 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/data/88c8d5e7c/87a84371f1bc474fabf24a45ee7e8932 [2023-11-12 00:47:52,250 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:47:52,252 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:47:52,254 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:47:52,254 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:47:52,260 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:47:52,261 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,262 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30232bb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52, skipping insertion in model container [2023-11-12 00:47:52,262 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,284 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:47:52,476 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_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c[537,550] [2023-11-12 00:47:52,505 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:47:52,519 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:47:52,538 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_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/sv-benchmarks/c/nla-digbench-scaling/lcm2_unwindbound1.c[537,550] [2023-11-12 00:47:52,556 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:47:52,575 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:47:52,575 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52 WrapperNode [2023-11-12 00:47:52,576 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:47:52,577 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:47:52,577 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:47:52,578 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:47:52,586 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,597 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,625 INFO L138 Inliner]: procedures = 14, calls = 20, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 56 [2023-11-12 00:47:52,625 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:47:52,626 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:47:52,627 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:47:52,627 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:47:52,637 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,638 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,649 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,650 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,658 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,667 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,669 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,671 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,673 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:47:52,678 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:47:52,678 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:47:52,678 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:47:52,679 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (1/1) ... [2023-11-12 00:47:52,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:47:52,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:47:52,719 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:47:52,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:47:52,768 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:47:52,768 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-12 00:47:52,769 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-12 00:47:52,769 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:47:52,769 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:47:52,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:47:52,771 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-12 00:47:52,772 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-12 00:47:52,934 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:47:52,936 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:47:53,140 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:47:53,205 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:47:53,205 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-12 00:47:53,208 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:47:53 BoogieIcfgContainer [2023-11-12 00:47:53,209 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:47:53,212 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:47:53,213 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:47:53,217 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:47:53,218 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:47:52" (1/3) ... [2023-11-12 00:47:53,219 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd2a377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:47:53, skipping insertion in model container [2023-11-12 00:47:53,220 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:47:52" (2/3) ... [2023-11-12 00:47:53,222 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cd2a377 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:47:53, skipping insertion in model container [2023-11-12 00:47:53,222 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:47:53" (3/3) ... [2023-11-12 00:47:53,225 INFO L112 eAbstractionObserver]: Analyzing ICFG lcm2_unwindbound1.c [2023-11-12 00:47:53,246 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:47:53,246 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:47:53,313 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:47:53,320 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=FINITE_AUTOMATA, 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;@1960216a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:47:53,320 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:47:53,325 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:47:53,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:47:53,333 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:47:53,333 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:47:53,334 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:47:53,339 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:47:53,339 INFO L85 PathProgramCache]: Analyzing trace with hash 263857554, now seen corresponding path program 1 times [2023-11-12 00:47:53,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:47:53,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779126660] [2023-11-12 00:47:53,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:53,351 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:47:53,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:47:53,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:47:53,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779126660] [2023-11-12 00:47:53,599 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-12 00:47:53,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259390989] [2023-11-12 00:47:53,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:53,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:47:53,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:47:53,607 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:47:53,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:47:53,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:47:53,738 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-12 00:47:53,746 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:47:53,780 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:47:53,780 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:47:53,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259390989] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:47:53,782 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:47:53,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:47:53,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537982175] [2023-11-12 00:47:53,787 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:47:53,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-12 00:47:53,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:47:53,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-12 00:47:53,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:47:53,838 INFO L87 Difference]: Start difference. First operand has 21 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-12 00:47:53,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:47:53,878 INFO L93 Difference]: Finished difference Result 34 states and 47 transitions. [2023-11-12 00:47:53,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-12 00:47:53,881 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2023-11-12 00:47:53,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:47:53,890 INFO L225 Difference]: With dead ends: 34 [2023-11-12 00:47:53,890 INFO L226 Difference]: Without dead ends: 19 [2023-11-12 00:47:53,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-12 00:47:53,899 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:47:53,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:47:53,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-12 00:47:53,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-12 00:47:53,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:47:53,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2023-11-12 00:47:53,949 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 19 [2023-11-12 00:47:53,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:47:53,952 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2023-11-12 00:47:53,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-12 00:47:53,953 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2023-11-12 00:47:53,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:47:53,956 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:47:53,956 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:47:53,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:47:54,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:47:54,162 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:47:54,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:47:54,163 INFO L85 PathProgramCache]: Analyzing trace with hash -999917202, now seen corresponding path program 1 times [2023-11-12 00:47:54,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:47:54,164 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761441581] [2023-11-12 00:47:54,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:54,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:47:54,187 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 00:47:54,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [918094201] [2023-11-12 00:47:54,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:54,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:47:54,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:47:54,190 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:47:54,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:47:54,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:47:54,325 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-12 00:47:54,329 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:47:54,580 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:47:54,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:47:54,722 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:47:54,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:47:54,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761441581] [2023-11-12 00:47:54,723 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 00:47:54,723 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918094201] [2023-11-12 00:47:54,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918094201] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-12 00:47:54,724 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:47:54,724 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7] total 10 [2023-11-12 00:47:54,724 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363779944] [2023-11-12 00:47:54,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:47:54,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:47:54,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:47:54,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:47:54,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:47:54,729 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-12 00:47:56,793 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 [] [2023-11-12 00:47:56,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:47:56,874 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2023-11-12 00:47:56,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:47:56,875 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2023-11-12 00:47:56,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:47:56,876 INFO L225 Difference]: With dead ends: 30 [2023-11-12 00:47:56,876 INFO L226 Difference]: Without dead ends: 27 [2023-11-12 00:47:56,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2023-11-12 00:47:56,879 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 8 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:47:56,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 65 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2023-11-12 00:47:56,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-12 00:47:56,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-12 00:47:56,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:47:56,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2023-11-12 00:47:56,889 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 20 [2023-11-12 00:47:56,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:47:56,902 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2023-11-12 00:47:56,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2023-11-12 00:47:56,902 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2023-11-12 00:47:56,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:47:56,903 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:47:56,904 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:47:56,915 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:47:57,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:47:57,109 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:47:57,110 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:47:57,110 INFO L85 PathProgramCache]: Analyzing trace with hash 1224321740, now seen corresponding path program 1 times [2023-11-12 00:47:57,111 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:47:57,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910350115] [2023-11-12 00:47:57,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:57,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:47:57,155 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 00:47:57,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [618918572] [2023-11-12 00:47:57,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:47:57,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:47:57,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:47:57,163 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:47:57,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:47:57,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:47:57,251 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:47:57,256 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:47:57,352 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:47:57,352 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:47:57,435 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:47:57,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:47:57,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910350115] [2023-11-12 00:47:57,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-12 00:47:57,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618918572] [2023-11-12 00:47:57,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618918572] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:47:57,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1517275649] [2023-11-12 00:47:57,466 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-12 00:47:57,467 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:47:57,471 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:47:57,477 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:47:57,477 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:47:59,082 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 73 for LOIs [2023-11-12 00:47:59,155 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2023-11-12 00:47:59,157 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:48:00,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1517275649] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:48:00,461 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-12 00:48:00,461 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [4, 5] total 17 [2023-11-12 00:48:00,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254084114] [2023-11-12 00:48:00,462 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:48:00,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:48:00,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:48:00,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:48:00,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2023-11-12 00:48:00,464 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:48:00,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:48:00,939 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2023-11-12 00:48:00,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:48:00,940 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 28 [2023-11-12 00:48:00,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:48:00,942 INFO L225 Difference]: With dead ends: 34 [2023-11-12 00:48:00,942 INFO L226 Difference]: Without dead ends: 29 [2023-11-12 00:48:00,942 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:48:00,944 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 5 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:48:00,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 30 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:48:00,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-12 00:48:00,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2023-11-12 00:48:00,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:48:00,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-12 00:48:00,958 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 28 [2023-11-12 00:48:00,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:48:00,959 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-12 00:48:00,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 7 states have internal predecessors, (11), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-12 00:48:00,959 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-12 00:48:00,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:48:00,960 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:48:00,960 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:48:00,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:48:01,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:48:01,167 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:48:01,167 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:48:01,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1222534280, now seen corresponding path program 1 times [2023-11-12 00:48:01,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:48:01,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598876724] [2023-11-12 00:48:01,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:48:01,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:48:01,185 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-12 00:48:01,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [225586822] [2023-11-12 00:48:01,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:48:01,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:48:01,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:48:01,187 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:48:01,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7ab4cebd-9f21-4a9c-93c4-dd0df96ea367/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process