./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire --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 d0e99b579c23cc22a276a70c2363ed9ed20405eb8e4be0ab38c77cda92397cf4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:34:41,164 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:34:41,291 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:34:41,299 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:34:41,300 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:34:41,342 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:34:41,343 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:34:41,344 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:34:41,345 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:34:41,350 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:34:41,351 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:34:41,352 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:34:41,353 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:34:41,355 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:34:41,355 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:34:41,356 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:34:41,356 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:34:41,357 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:34:41,357 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:34:41,358 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:34:41,358 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:34:41,359 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:34:41,360 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:34:41,361 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:34:41,362 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:34:41,362 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:34:41,363 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:34:41,363 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:34:41,364 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:34:41,364 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:34:41,366 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:34:41,366 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:34:41,366 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:34:41,367 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:34:41,367 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:34:41,367 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:34:41,368 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:34:41,368 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:34:41,369 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:34:41,369 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:34:41,370 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:34:41,370 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:34:41,371 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:34:41,371 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:34:41,372 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:34:41,372 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:34:41,372 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:34:41,373 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_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d0e99b579c23cc22a276a70c2363ed9ed20405eb8e4be0ab38c77cda92397cf4 [2023-11-23 20:34:41,689 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:34:41,730 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:34:41,733 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:34:41,734 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:34:41,735 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:34:41,736 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c [2023-11-23 20:34:44,922 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:34:45,129 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:34:45,130 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c [2023-11-23 20:34:45,138 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/data/c5b3c7afd/7de874e9c12f4bf887da2f496debb44b/FLAGa0333f9db [2023-11-23 20:34:45,155 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/data/c5b3c7afd/7de874e9c12f4bf887da2f496debb44b [2023-11-23 20:34:45,158 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:34:45,160 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:34:45,162 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:34:45,162 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:34:45,168 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:34:45,169 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,170 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ba0168f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45, skipping insertion in model container [2023-11-23 20:34:45,171 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,201 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:34:45,430 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_92bd1aa2-c288-437b-8c02-11855df8d757/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c[458,471] [2023-11-23 20:34:45,460 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:34:45,474 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:34:45,492 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_92bd1aa2-c288-437b-8c02-11855df8d757/sv-benchmarks/c/nla-digbench-scaling/ps4-ll_unwindbound2.c[458,471] [2023-11-23 20:34:45,513 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:34:45,530 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:34:45,531 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45 WrapperNode [2023-11-23 20:34:45,531 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:34:45,532 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:34:45,533 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:34:45,533 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:34:45,541 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,571 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,590 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 39 [2023-11-23 20:34:45,591 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:34:45,591 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:34:45,591 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:34:45,592 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:34:45,602 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,602 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,616 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,617 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,620 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,632 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,633 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,634 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,636 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:34:45,637 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:34:45,637 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:34:45,637 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:34:45,638 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (1/1) ... [2023-11-23 20:34:45,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:34:45,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:45,680 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:34:45,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:34:45,724 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:34:45,724 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:34:45,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:34:45,724 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:34:45,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 20:34:45,725 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 20:34:45,793 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:34:45,798 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:34:45,952 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:34:45,979 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:34:45,979 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 20:34:45,981 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:34:45 BoogieIcfgContainer [2023-11-23 20:34:45,981 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:34:45,985 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:34:45,985 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:34:45,989 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:34:45,989 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:34:45" (1/3) ... [2023-11-23 20:34:45,990 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48847aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:34:45, skipping insertion in model container [2023-11-23 20:34:45,991 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:45" (2/3) ... [2023-11-23 20:34:45,991 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48847aa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:34:45, skipping insertion in model container [2023-11-23 20:34:45,992 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:34:45" (3/3) ... [2023-11-23 20:34:45,993 INFO L112 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound2.c [2023-11-23 20:34:46,017 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:34:46,017 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:34:46,074 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:34:46,081 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;@24b6508, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:34:46,082 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:34:46,086 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:46,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 20:34:46,096 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:46,097 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 20:34:46,097 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:46,103 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:46,103 INFO L85 PathProgramCache]: Analyzing trace with hash -2070802916, now seen corresponding path program 1 times [2023-11-23 20:34:46,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:46,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989923921] [2023-11-23 20:34:46,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:46,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:46,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:46,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:46,243 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989923921] [2023-11-23 20:34:46,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-23 20:34:46,245 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1481313848] [2023-11-23 20:34:46,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:46,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:46,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:46,251 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:46,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:34:46,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:46,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 20:34:46,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:46,384 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:46,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1481313848] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:46,386 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:46,386 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:34:46,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436815194] [2023-11-23 20:34:46,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:46,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-23 20:34:46,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:46,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-23 20:34:46,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 20:34:46,458 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2023-11-23 20:34:46,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:46,511 INFO L93 Difference]: Finished difference Result 29 states and 42 transitions. [2023-11-23 20:34:46,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-23 20:34:46,514 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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 6 [2023-11-23 20:34:46,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:46,524 INFO L225 Difference]: With dead ends: 29 [2023-11-23 20:34:46,524 INFO L226 Difference]: Without dead ends: 13 [2023-11-23 20:34:46,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 20:34:46,533 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:46,534 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:34:46,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-23 20:34:46,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-23 20:34:46,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:46,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-23 20:34:46,584 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6 [2023-11-23 20:34:46,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:46,584 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-23 20:34:46,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 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) [2023-11-23 20:34:46,586 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-23 20:34:46,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 20:34:46,588 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:46,588 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:46,603 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 20:34:46,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-23 20:34:46,791 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:46,792 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:46,793 INFO L85 PathProgramCache]: Analyzing trace with hash -170804699, now seen corresponding path program 1 times [2023-11-23 20:34:46,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:46,793 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239928549] [2023-11-23 20:34:46,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:46,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:46,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:46,838 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:46,838 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239928549] [2023-11-23 20:34:46,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-23 20:34:46,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052010995] [2023-11-23 20:34:46,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:46,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:46,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:46,842 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:46,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:34:46,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:46,905 INFO L262 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:34:46,907 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:46,965 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:46,965 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:46,966 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052010995] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:46,966 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:46,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:46,967 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946648707] [2023-11-23 20:34:46,967 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:46,968 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:34:46,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:46,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:34:46,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:34:46,970 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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) [2023-11-23 20:34:46,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:46,993 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2023-11-23 20:34:46,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:34:46,994 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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 [2023-11-23 20:34:46,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:46,996 INFO L225 Difference]: With dead ends: 23 [2023-11-23 20:34:46,996 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 20:34:46,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:34:46,999 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:47,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:34:47,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 20:34:47,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-23 20:34:47,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:47,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-23 20:34:47,007 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2023-11-23 20:34:47,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:47,008 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-23 20:34:47,009 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 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) [2023-11-23 20:34:47,009 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-23 20:34:47,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 20:34:47,010 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:47,010 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:47,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:47,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:47,224 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:47,225 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:47,225 INFO L85 PathProgramCache]: Analyzing trace with hash -169017239, now seen corresponding path program 1 times [2023-11-23 20:34:47,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:47,225 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243971618] [2023-11-23 20:34:47,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:47,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:47,250 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:34:47,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1312283445] [2023-11-23 20:34:47,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:47,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:47,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:47,269 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:47,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:34:47,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:47,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 20:34:47,350 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:47,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:47,434 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:47,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:47,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243971618] [2023-11-23 20:34:47,434 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:34:47,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312283445] [2023-11-23 20:34:47,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312283445] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:47,435 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:47,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:34:47,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613655957] [2023-11-23 20:34:47,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:47,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:34:47,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:47,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:34:47,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:34:47,438 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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) [2023-11-23 20:34:47,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:47,495 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2023-11-23 20:34:47,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:34:47,496 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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 [2023-11-23 20:34:47,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:47,497 INFO L225 Difference]: With dead ends: 25 [2023-11-23 20:34:47,497 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 20:34:47,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:47,499 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 6 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:47,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 45 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:34:47,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 20:34:47,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-23 20:34:47,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:47,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-11-23 20:34:47,510 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 7 [2023-11-23 20:34:47,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:47,511 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-11-23 20:34:47,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 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) [2023-11-23 20:34:47,511 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-11-23 20:34:47,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 20:34:47,512 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:47,513 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:47,541 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:47,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:47,732 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:47,733 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:47,733 INFO L85 PathProgramCache]: Analyzing trace with hash 867499275, now seen corresponding path program 1 times [2023-11-23 20:34:47,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:47,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203502032] [2023-11-23 20:34:47,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:47,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:47,760 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:34:47,761 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [72775881] [2023-11-23 20:34:47,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:47,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:47,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:47,762 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:47,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:34:47,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:47,846 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 20:34:47,847 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:47,904 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:47,905 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:47,966 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:47,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:47,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203502032] [2023-11-23 20:34:47,967 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:34:47,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72775881] [2023-11-23 20:34:47,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72775881] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:47,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136923852] [2023-11-23 20:34:47,992 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:34:47,992 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:47,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:48,002 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:48,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:49,708 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 77 for LOIs [2023-11-23 20:34:49,961 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:51,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '345#(and (or (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_10| Int)) (and (exists ((|v_ULTIMATE.start_main_#t~post5#1_22| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| 32768)) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_22|) (<= |v_ULTIMATE.start_main_#t~post5#1_22| 1) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_10| 32767) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_10|))) (not (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) (* (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_11|) 2)))))) (exists ((|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| Int)) (and (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_7|) (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| 32767) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| 32768)) (not (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|) (* |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_7| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_8|)))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 20:34:51,197 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:51,197 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:34:51,197 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2023-11-23 20:34:51,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966095101] [2023-11-23 20:34:51,198 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:51,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:34:51,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:51,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:34:51,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2023-11-23 20:34:51,200 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:34:51,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:51,240 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2023-11-23 20:34:51,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:34:51,241 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 15 [2023-11-23 20:34:51,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:51,243 INFO L225 Difference]: With dead ends: 31 [2023-11-23 20:34:51,244 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 20:34:51,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2023-11-23 20:34:51,254 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:51,255 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 42 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:34:51,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 20:34:51,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 20:34:51,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:51,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-23 20:34:51,268 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 15 [2023-11-23 20:34:51,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:51,268 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-23 20:34:51,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:34:51,270 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-23 20:34:51,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 20:34:51,272 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:51,272 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:51,300 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:51,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:51,500 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:51,500 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:51,501 INFO L85 PathProgramCache]: Analyzing trace with hash 869286735, now seen corresponding path program 1 times [2023-11-23 20:34:51,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:51,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269992788] [2023-11-23 20:34:51,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:51,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:51,515 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:34:51,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [485840768] [2023-11-23 20:34:51,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:51,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:51,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:51,524 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:51,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:34:51,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:51,586 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 20:34:51,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:51,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:51,685 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:51,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:51,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269992788] [2023-11-23 20:34:51,786 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:34:51,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485840768] [2023-11-23 20:34:51,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [485840768] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:51,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1806930118] [2023-11-23 20:34:51,790 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 20:34:51,790 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:51,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:51,791 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:51,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:52,665 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 50 for LOIs [2023-11-23 20:34:52,773 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:53,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '526#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23| Int) (|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| Int)) (and (not (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|))))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_27| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| 32768)) (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_19| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_19|) (<= |v_ULTIMATE.start_main_#t~post5#1_27| 1) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_23|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_23|) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_27|) (<= 1 ~counter~0))))))' at error location [2023-11-23 20:34:53,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:53,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:34:53,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2023-11-23 20:34:53,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137657460] [2023-11-23 20:34:53,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:53,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:34:53,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:53,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:34:53,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2023-11-23 20:34:53,981 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:54,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:54,103 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-11-23 20:34:54,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:34:54,104 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 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 15 [2023-11-23 20:34:54,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:54,105 INFO L225 Difference]: With dead ends: 33 [2023-11-23 20:34:54,106 INFO L226 Difference]: Without dead ends: 27 [2023-11-23 20:34:54,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2023-11-23 20:34:54,108 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:54,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 70 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:54,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-23 20:34:54,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2023-11-23 20:34:54,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:54,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-11-23 20:34:54,116 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 15 [2023-11-23 20:34:54,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:54,117 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-11-23 20:34:54,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:54,117 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-11-23 20:34:54,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 20:34:54,118 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:54,119 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:54,147 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:54,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:54,334 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:54,334 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:54,335 INFO L85 PathProgramCache]: Analyzing trace with hash 24753612, now seen corresponding path program 1 times [2023-11-23 20:34:54,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:54,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283370370] [2023-11-23 20:34:54,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:54,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:54,345 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:34:54,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1045086582] [2023-11-23 20:34:54,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:54,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:54,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:54,348 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:54,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:34:54,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:54,405 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 20:34:54,407 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:54,541 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:34:54,541 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:54,820 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:34:54,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:54,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283370370] [2023-11-23 20:34:54,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 20:34:54,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045086582] [2023-11-23 20:34:54,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045086582] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:54,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031474949] [2023-11-23 20:34:54,824 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:34:54,824 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:54,825 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:54,825 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:54,825 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:55,674 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 86 for LOIs [2023-11-23 20:34:55,955 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:35:04,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '752#(and (or (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_35| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_33| Int)) (and (not (= (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|) (* 2 (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|)) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|)) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_35| 4))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_33| Int)) (and (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| 32768)) (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|) (<= 1 ~counter~0) (<= |v_ULTIMATE.start_main_#t~post5#1_33| 1) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_32| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_33|) (<= 0 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_35|) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_33|))))) (exists ((|v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_34| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| Int) (|v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32| Int)) (and (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32|) (= (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_34| 4) (+ (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) (* (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) 2) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|))) (not (= (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31|) (* |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37| |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|))) (exists ((|v_ULTIMATE.start_main_#t~post5#1_33| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| 32767) (<= 0 |v_ULTIMATE.start_main_~c~0#1_BEFORE_CALL_32|) (<= 0 (+ |v_ULTIMATE.start_main_~k~0#1_BEFORE_CALL_31| 32768)) (<= 1 ~counter~0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_37|) (<= |v_ULTIMATE.start_main_#t~post5#1_33| 1) (<= 0 |v_ULTIMATE.start_main_#t~post5#1_33|)))))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 20:35:04,710 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:35:04,710 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:35:04,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2023-11-23 20:35:04,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290885247] [2023-11-23 20:35:04,710 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:35:04,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-23 20:35:04,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:04,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-23 20:35:04,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=471, Unknown=1, NotChecked=0, Total=552 [2023-11-23 20:35:04,714 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:35:05,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:05,011 INFO L93 Difference]: Finished difference Result 43 states and 51 transitions. [2023-11-23 20:35:05,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:35:05,012 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-11-23 20:35:05,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:05,013 INFO L225 Difference]: With dead ends: 43 [2023-11-23 20:35:05,014 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 20:35:05,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=129, Invalid=740, Unknown=1, NotChecked=0, Total=870 [2023-11-23 20:35:05,016 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 27 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:05,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 66 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:05,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 20:35:05,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2023-11-23 20:35:05,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 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) [2023-11-23 20:35:05,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-11-23 20:35:05,031 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 21 [2023-11-23 20:35:05,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:05,032 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-11-23 20:35:05,032 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-23 20:35:05,032 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-11-23 20:35:05,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 20:35:05,034 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:05,034 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 20:35:05,066 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-23 20:35:05,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:35:05,248 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:05,248 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:05,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1196295695, now seen corresponding path program 2 times [2023-11-23 20:35:05,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:05,248 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368646785] [2023-11-23 20:35:05,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:05,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:05,258 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 20:35:05,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1180603860] [2023-11-23 20:35:05,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:05,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:05,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:05,261 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:05,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92bd1aa2-c288-437b-8c02-11855df8d757/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process