./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/in-de31.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_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/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_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/in-de31.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/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_99653940-8fd4-498d-b850-097297b11c54/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 28f1f7a35f3c64149ac63836a12126d2f43ea1d4c4384507ba9d3ae156113818 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:10:43,087 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:10:43,157 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:10:43,163 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:10:43,164 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:10:43,192 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:10:43,192 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:10:43,193 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:10:43,194 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:10:43,195 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:10:43,196 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:10:43,196 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:10:43,197 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:10:43,198 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:10:43,199 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:10:43,199 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:10:43,200 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:10:43,201 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:10:43,202 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:10:43,202 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:10:43,203 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:10:43,204 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:10:43,205 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:10:43,206 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:10:43,207 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:10:43,207 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:10:43,208 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:10:43,209 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:10:43,209 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:10:43,210 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:10:43,210 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:10:43,211 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:10:43,212 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:10:43,212 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:10:43,212 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:10:43,213 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:10:43,213 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:10:43,214 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:10:43,214 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:10:43,215 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:10:43,215 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:10:43,216 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:10:43,216 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:10:43,216 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:10:43,216 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:10:43,217 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:10:43,217 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:10:43,217 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_99653940-8fd4-498d-b850-097297b11c54/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 28f1f7a35f3c64149ac63836a12126d2f43ea1d4c4384507ba9d3ae156113818 [2023-11-23 21:10:43,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:10:43,562 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:10:43,565 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:10:43,568 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:10:43,568 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:10:43,569 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/loops-crafted-1/in-de31.c [2023-11-23 21:10:46,708 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:10:46,914 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:10:46,914 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/sv-benchmarks/c/loops-crafted-1/in-de31.c [2023-11-23 21:10:46,922 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/data/297bfa864/4dbc60334a014fd792e3c8a4ec6a04f5/FLAG9ed4bd548 [2023-11-23 21:10:46,941 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/data/297bfa864/4dbc60334a014fd792e3c8a4ec6a04f5 [2023-11-23 21:10:46,948 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:10:46,949 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:10:46,953 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:10:46,954 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:10:46,959 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:10:46,962 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:10:46" (1/1) ... [2023-11-23 21:10:46,963 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@782efa50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:46, skipping insertion in model container [2023-11-23 21:10:46,963 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:10:46" (1/1) ... [2023-11-23 21:10:46,988 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:10:47,144 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_99653940-8fd4-498d-b850-097297b11c54/sv-benchmarks/c/loops-crafted-1/in-de31.c[368,381] [2023-11-23 21:10:47,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:10:47,176 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:10:47,188 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_99653940-8fd4-498d-b850-097297b11c54/sv-benchmarks/c/loops-crafted-1/in-de31.c[368,381] [2023-11-23 21:10:47,192 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:10:47,206 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:10:47,207 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47 WrapperNode [2023-11-23 21:10:47,207 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:10:47,209 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:10:47,209 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:10:47,209 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:10:47,217 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,224 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,242 INFO L138 Inliner]: procedures = 13, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 55 [2023-11-23 21:10:47,243 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:10:47,243 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:10:47,244 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:10:47,244 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:10:47,250 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,251 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,252 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,252 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,255 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,259 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,260 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,261 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,262 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:10:47,265 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:10:47,265 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:10:47,266 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:10:47,266 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (1/1) ... [2023-11-23 21:10:47,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:10:47,284 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:47,299 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:10:47,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:10:47,342 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:10:47,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:10:47,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:10:47,343 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:10:47,428 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:10:47,430 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:10:47,627 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:10:47,672 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:10:47,673 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 21:10:47,674 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:10:47 BoogieIcfgContainer [2023-11-23 21:10:47,675 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:10:47,677 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:10:47,677 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:10:47,681 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:10:47,681 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:10:46" (1/3) ... [2023-11-23 21:10:47,682 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@705a558 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:10:47, skipping insertion in model container [2023-11-23 21:10:47,682 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:10:47" (2/3) ... [2023-11-23 21:10:47,683 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@705a558 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:10:47, skipping insertion in model container [2023-11-23 21:10:47,683 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:10:47" (3/3) ... [2023-11-23 21:10:47,684 INFO L112 eAbstractionObserver]: Analyzing ICFG in-de31.c [2023-11-23 21:10:47,705 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:10:47,705 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:10:47,755 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:10:47,762 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;@2b2b5ebb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:10:47,762 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:10:47,767 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:47,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:10:47,774 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:47,774 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:10:47,775 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:47,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:47,781 INFO L85 PathProgramCache]: Analyzing trace with hash -1774769397, now seen corresponding path program 1 times [2023-11-23 21:10:47,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:47,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82536185] [2023-11-23 21:10:47,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:47,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:47,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:48,483 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 21:10:48,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:48,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82536185] [2023-11-23 21:10:48,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82536185] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:10:48,485 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:10:48,486 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:10:48,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620236872] [2023-11-23 21:10:48,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:10:48,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:10:48,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:48,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:10:48,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:10:48,541 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:48,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:48,695 INFO L93 Difference]: Finished difference Result 21 states and 30 transitions. [2023-11-23 21:10:48,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:10:48,699 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 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 21:10:48,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:48,707 INFO L225 Difference]: With dead ends: 21 [2023-11-23 21:10:48,707 INFO L226 Difference]: Without dead ends: 8 [2023-11-23 21:10:48,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:10:48,715 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 7 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:48,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:10:48,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2023-11-23 21:10:48,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2023-11-23 21:10:48,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:48,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2023-11-23 21:10:48,751 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2023-11-23 21:10:48,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:48,753 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2023-11-23 21:10:48,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:48,753 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2023-11-23 21:10:48,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:10:48,754 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:48,755 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:48,755 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:10:48,755 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:48,756 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:48,756 INFO L85 PathProgramCache]: Analyzing trace with hash -611083188, now seen corresponding path program 1 times [2023-11-23 21:10:48,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:48,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608221934] [2023-11-23 21:10:48,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:48,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:48,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:48,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:48,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:48,968 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608221934] [2023-11-23 21:10:48,968 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608221934] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:48,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815228510] [2023-11-23 21:10:48,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:48,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:48,971 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:48,975 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:48,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:10:49,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:49,031 INFO L262 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:10:49,035 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:49,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:49,068 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:49,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:49,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815228510] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:49,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509752560] [2023-11-23 21:10:49,132 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:49,132 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:49,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:49,142 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:49,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:49,355 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:49,549 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107#(and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:49,550 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:49,550 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:49,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2023-11-23 21:10:49,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210220770] [2023-11-23 21:10:49,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:49,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:10:49,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:49,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:10:49,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:10:49,557 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:49,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:49,725 INFO L93 Difference]: Finished difference Result 29 states and 44 transitions. [2023-11-23 21:10:49,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:10:49,726 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 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 21:10:49,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:49,728 INFO L225 Difference]: With dead ends: 29 [2023-11-23 21:10:49,729 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:10:49,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:10:49,734 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 24 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:49,735 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:10:49,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:10:49,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2023-11-23 21:10:49,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:49,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 25 transitions. [2023-11-23 21:10:49,748 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 25 transitions. Word has length 7 [2023-11-23 21:10:49,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:49,748 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 25 transitions. [2023-11-23 21:10:49,749 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:49,749 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 25 transitions. [2023-11-23 21:10:49,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:10:49,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:49,750 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:49,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:49,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:49,966 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:49,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:49,967 INFO L85 PathProgramCache]: Analyzing trace with hash 212774083, now seen corresponding path program 1 times [2023-11-23 21:10:49,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:49,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853460012] [2023-11-23 21:10:49,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:49,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:50,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:50,439 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:50,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:50,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853460012] [2023-11-23 21:10:50,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853460012] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:50,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235961445] [2023-11-23 21:10:50,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:50,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:50,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:50,447 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:50,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:10:50,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:50,496 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 21:10:50,498 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:50,719 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:50,719 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:50,905 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:50,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235961445] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:50,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [402877217] [2023-11-23 21:10:50,910 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:50,911 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:50,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:50,912 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:50,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:51,112 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:51,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '263#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:51,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:51,263 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:51,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 14 [2023-11-23 21:10:51,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671775029] [2023-11-23 21:10:51,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:51,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-23 21:10:51,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:51,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-23 21:10:51,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2023-11-23 21:10:51,266 INFO L87 Difference]: Start difference. First operand 18 states and 25 transitions. Second operand has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:51,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:51,750 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2023-11-23 21:10:51,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 21:10:51,750 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:10:51,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:51,751 INFO L225 Difference]: With dead ends: 35 [2023-11-23 21:10:51,751 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:10:51,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:10:51,753 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 15 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:51,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 17 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:10:51,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:10:51,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2023-11-23 21:10:51,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:51,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 22 transitions. [2023-11-23 21:10:51,765 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 22 transitions. Word has length 9 [2023-11-23 21:10:51,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:51,766 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 22 transitions. [2023-11-23 21:10:51,766 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:51,766 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 22 transitions. [2023-11-23 21:10:51,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:10:51,767 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:51,767 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:51,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:51,987 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:51,988 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:51,988 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:51,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1114239819, now seen corresponding path program 2 times [2023-11-23 21:10:51,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:51,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557671971] [2023-11-23 21:10:51,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:51,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:52,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:52,091 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:52,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:52,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557671971] [2023-11-23 21:10:52,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557671971] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:52,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241965704] [2023-11-23 21:10:52,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:10:52,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:52,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:52,094 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:52,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:10:52,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:10:52,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:10:52,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-23 21:10:52,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:52,167 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:52,168 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:52,288 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:52,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241965704] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:52,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1376622447] [2023-11-23 21:10:52,293 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:52,293 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:52,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:52,294 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:52,294 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:52,422 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:52,596 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '438#(and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:52,596 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:52,596 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:52,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-23 21:10:52,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522171403] [2023-11-23 21:10:52,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:52,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-23 21:10:52,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:52,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-23 21:10:52,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:10:52,599 INFO L87 Difference]: Start difference. First operand 16 states and 22 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:53,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:53,306 INFO L93 Difference]: Finished difference Result 62 states and 102 transitions. [2023-11-23 21:10:53,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-23 21:10:53,307 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-23 21:10:53,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:53,308 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:10:53,308 INFO L226 Difference]: Without dead ends: 58 [2023-11-23 21:10:53,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=321, Invalid=939, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 21:10:53,309 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 142 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:53,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 17 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:10:53,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-23 21:10:53,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 32. [2023-11-23 21:10:53,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.4838709677419355) internal successors, (46), 31 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:53,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 46 transitions. [2023-11-23 21:10:53,334 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 46 transitions. Word has length 10 [2023-11-23 21:10:53,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:53,334 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 46 transitions. [2023-11-23 21:10:53,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:53,335 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 46 transitions. [2023-11-23 21:10:53,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:10:53,336 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:53,336 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:53,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:53,572 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:53,573 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:53,573 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:53,573 INFO L85 PathProgramCache]: Analyzing trace with hash -60019915, now seen corresponding path program 2 times [2023-11-23 21:10:53,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:53,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971680514] [2023-11-23 21:10:53,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:53,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:53,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:53,669 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:10:53,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:53,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971680514] [2023-11-23 21:10:53,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971680514] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:53,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261739347] [2023-11-23 21:10:53,670 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:10:53,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:53,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:53,672 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:53,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:10:53,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:10:53,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:10:53,719 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-23 21:10:53,720 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:53,751 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:10:53,752 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:53,825 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:10:53,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261739347] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:53,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582747979] [2023-11-23 21:10:53,830 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:53,830 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:53,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:53,830 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:53,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:53,971 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:54,057 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '722#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:54,058 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:54,058 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:54,058 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2023-11-23 21:10:54,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766802789] [2023-11-23 21:10:54,059 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:54,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 21:10:54,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:54,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 21:10:54,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:10:54,061 INFO L87 Difference]: Start difference. First operand 32 states and 46 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:54,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:54,246 INFO L93 Difference]: Finished difference Result 62 states and 84 transitions. [2023-11-23 21:10:54,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:10:54,247 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:10:54,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:54,251 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:10:54,251 INFO L226 Difference]: Without dead ends: 53 [2023-11-23 21:10:54,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:10:54,254 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 16 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:54,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 22 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:10:54,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-23 21:10:54,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2023-11-23 21:10:54,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:54,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 57 transitions. [2023-11-23 21:10:54,291 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 57 transitions. Word has length 11 [2023-11-23 21:10:54,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:54,291 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 57 transitions. [2023-11-23 21:10:54,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:54,292 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 57 transitions. [2023-11-23 21:10:54,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:10:54,292 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:54,293 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:54,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:54,506 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:54,506 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:54,507 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:54,507 INFO L85 PathProgramCache]: Analyzing trace with hash -454325109, now seen corresponding path program 3 times [2023-11-23 21:10:54,507 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:54,507 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095951607] [2023-11-23 21:10:54,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:54,508 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:54,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:54,964 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:54,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:54,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095951607] [2023-11-23 21:10:54,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095951607] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:54,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892843003] [2023-11-23 21:10:54,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:10:54,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:54,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:54,967 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:54,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:10:55,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:10:55,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:10:55,032 INFO L262 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-23 21:10:55,034 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:55,276 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:55,277 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:55,561 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:55,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892843003] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:55,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [661512623] [2023-11-23 21:10:55,564 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:55,564 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:55,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:55,564 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:55,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:55,683 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:55,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1005#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:55,846 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:55,846 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:55,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 8] total 21 [2023-11-23 21:10:55,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314417030] [2023-11-23 21:10:55,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:55,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-23 21:10:55,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:55,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-23 21:10:55,848 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=566, Unknown=0, NotChecked=0, Total=650 [2023-11-23 21:10:55,848 INFO L87 Difference]: Start difference. First operand 39 states and 57 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:56,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:56,777 INFO L93 Difference]: Finished difference Result 73 states and 95 transitions. [2023-11-23 21:10:56,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:10:56,777 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 21:10:56,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:56,778 INFO L225 Difference]: With dead ends: 73 [2023-11-23 21:10:56,778 INFO L226 Difference]: Without dead ends: 55 [2023-11-23 21:10:56,779 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=178, Invalid=1082, Unknown=0, NotChecked=0, Total=1260 [2023-11-23 21:10:56,780 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 26 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:56,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 32 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:10:56,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-23 21:10:56,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 39. [2023-11-23 21:10:56,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.4736842105263157) internal successors, (56), 38 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:56,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 56 transitions. [2023-11-23 21:10:56,815 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 56 transitions. Word has length 12 [2023-11-23 21:10:56,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:56,816 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 56 transitions. [2023-11-23 21:10:56,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:56,816 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 56 transitions. [2023-11-23 21:10:56,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:10:56,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:56,817 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:56,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:57,039 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:57,039 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:57,039 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:57,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1692990645, now seen corresponding path program 4 times [2023-11-23 21:10:57,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:57,040 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640241898] [2023-11-23 21:10:57,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:57,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:57,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:57,237 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:10:57,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:57,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640241898] [2023-11-23 21:10:57,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640241898] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:57,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520955602] [2023-11-23 21:10:57,238 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:10:57,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:57,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:57,240 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:57,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:10:57,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:57,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-23 21:10:57,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:57,373 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:10:57,374 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:57,459 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:10:57,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520955602] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:57,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603778861] [2023-11-23 21:10:57,461 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:57,461 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:57,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:57,462 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:57,462 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:57,567 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:57,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1329#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:57,664 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:57,664 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:57,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 6] total 17 [2023-11-23 21:10:57,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292488658] [2023-11-23 21:10:57,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:57,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:10:57,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:57,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:10:57,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:10:57,669 INFO L87 Difference]: Start difference. First operand 39 states and 56 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:57,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:57,945 INFO L93 Difference]: Finished difference Result 70 states and 98 transitions. [2023-11-23 21:10:57,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-23 21:10:57,947 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 21:10:57,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:57,948 INFO L225 Difference]: With dead ends: 70 [2023-11-23 21:10:57,948 INFO L226 Difference]: Without dead ends: 61 [2023-11-23 21:10:57,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2023-11-23 21:10:57,950 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 33 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:57,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 13 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:10:57,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-23 21:10:57,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 47. [2023-11-23 21:10:57,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.4130434782608696) internal successors, (65), 46 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:57,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 65 transitions. [2023-11-23 21:10:57,989 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 65 transitions. Word has length 14 [2023-11-23 21:10:57,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:57,990 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 65 transitions. [2023-11-23 21:10:57,990 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:57,990 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 65 transitions. [2023-11-23 21:10:57,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:10:57,991 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:57,991 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:58,018 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:58,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:10:58,206 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:58,206 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:58,207 INFO L85 PathProgramCache]: Analyzing trace with hash -1197854901, now seen corresponding path program 5 times [2023-11-23 21:10:58,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:58,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539081549] [2023-11-23 21:10:58,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:58,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:58,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:58,327 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:10:58,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:58,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539081549] [2023-11-23 21:10:58,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539081549] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:58,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045050711] [2023-11-23 21:10:58,328 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:10:58,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:58,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:58,329 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:58,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:10:58,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:10:58,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:10:58,389 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-23 21:10:58,390 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:58,409 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:10:58,410 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:58,514 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:10:58,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045050711] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:58,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573544073] [2023-11-23 21:10:58,516 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:10:58,516 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:58,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:58,517 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:58,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:58,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:58,727 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1659#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:10:58,727 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:58,727 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:58,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2023-11-23 21:10:58,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235642852] [2023-11-23 21:10:58,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:58,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:10:58,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:58,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:10:58,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:10:58,729 INFO L87 Difference]: Start difference. First operand 47 states and 65 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:00,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:00,089 INFO L93 Difference]: Finished difference Result 89 states and 113 transitions. [2023-11-23 21:11:00,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-11-23 21:11:00,090 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 21:11:00,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:00,090 INFO L225 Difference]: With dead ends: 89 [2023-11-23 21:11:00,090 INFO L226 Difference]: Without dead ends: 77 [2023-11-23 21:11:00,092 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=538, Invalid=2324, Unknown=0, NotChecked=0, Total=2862 [2023-11-23 21:11:00,093 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 109 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:00,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 41 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:11:00,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-23 21:11:00,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 51. [2023-11-23 21:11:00,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.4) internal successors, (70), 50 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:00,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2023-11-23 21:11:00,143 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 14 [2023-11-23 21:11:00,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:00,143 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2023-11-23 21:11:00,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:00,144 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2023-11-23 21:11:00,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 21:11:00,145 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:00,145 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:00,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:00,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:00,362 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:00,363 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:00,363 INFO L85 PathProgramCache]: Analyzing trace with hash -2107416637, now seen corresponding path program 6 times [2023-11-23 21:11:00,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:00,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359176165] [2023-11-23 21:11:00,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:00,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:00,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:01,080 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:01,080 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:01,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359176165] [2023-11-23 21:11:01,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359176165] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:01,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583383864] [2023-11-23 21:11:01,081 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:11:01,081 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:01,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:01,082 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:01,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:11:01,154 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:11:01,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:11:01,156 WARN L260 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-23 21:11:01,157 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:01,714 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:01,714 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:02,168 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:02,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583383864] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:02,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1548440070] [2023-11-23 21:11:02,170 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:02,170 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:02,171 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:02,171 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:02,171 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:02,278 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:02,445 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2102#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:02,445 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:02,445 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:02,445 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 10] total 28 [2023-11-23 21:11:02,445 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377753405] [2023-11-23 21:11:02,446 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:02,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-23 21:11:02,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:02,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-23 21:11:02,447 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2023-11-23 21:11:02,447 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:04,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:04,089 INFO L93 Difference]: Finished difference Result 83 states and 105 transitions. [2023-11-23 21:11:04,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-23 21:11:04,089 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-23 21:11:04,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:04,090 INFO L225 Difference]: With dead ends: 83 [2023-11-23 21:11:04,090 INFO L226 Difference]: Without dead ends: 63 [2023-11-23 21:11:04,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=244, Invalid=1648, Unknown=0, NotChecked=0, Total=1892 [2023-11-23 21:11:04,092 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 25 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:04,092 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 34 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:11:04,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-23 21:11:04,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 46. [2023-11-23 21:11:04,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.4) internal successors, (63), 45 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:04,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 63 transitions. [2023-11-23 21:11:04,136 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 63 transitions. Word has length 15 [2023-11-23 21:11:04,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:04,136 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 63 transitions. [2023-11-23 21:11:04,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 28 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:04,136 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 63 transitions. [2023-11-23 21:11:04,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:11:04,137 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:04,137 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:04,159 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:04,358 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:04,359 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:04,359 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:04,359 INFO L85 PathProgramCache]: Analyzing trace with hash 49456043, now seen corresponding path program 3 times [2023-11-23 21:11:04,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:04,359 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603118833] [2023-11-23 21:11:04,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:04,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:04,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:04,554 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:04,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:04,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603118833] [2023-11-23 21:11:04,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603118833] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:04,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569051906] [2023-11-23 21:11:04,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:11:04,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:04,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:04,557 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:04,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:11:04,615 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:11:04,615 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:11:04,616 INFO L262 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 21:11:04,617 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:04,655 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:04,656 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:05,004 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:05,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569051906] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:05,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1123854257] [2023-11-23 21:11:05,006 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:05,006 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:05,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:05,006 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:05,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:05,090 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:05,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2487#(and (= |ULTIMATE.start_main_~y~0#1| |ULTIMATE.start_main_~z~0#1|) (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~x~0#1| 4294967296) 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:05,335 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:05,335 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:05,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-11-23 21:11:05,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981510243] [2023-11-23 21:11:05,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:05,336 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-23 21:11:05,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:05,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-23 21:11:05,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=768, Unknown=0, NotChecked=0, Total=992 [2023-11-23 21:11:05,338 INFO L87 Difference]: Start difference. First operand 46 states and 63 transitions. Second operand has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:09,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:09,972 INFO L93 Difference]: Finished difference Result 190 states and 288 transitions. [2023-11-23 21:11:09,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-11-23 21:11:09,972 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-23 21:11:09,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:09,974 INFO L225 Difference]: With dead ends: 190 [2023-11-23 21:11:09,974 INFO L226 Difference]: Without dead ends: 178 [2023-11-23 21:11:09,977 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1207 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1350, Invalid=3480, Unknown=0, NotChecked=0, Total=4830 [2023-11-23 21:11:09,978 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 564 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 253 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 253 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:09,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 21 Invalid, 862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [253 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-23 21:11:09,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2023-11-23 21:11:10,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 73. [2023-11-23 21:11:10,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.4583333333333333) internal successors, (105), 72 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:10,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 105 transitions. [2023-11-23 21:11:10,037 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 105 transitions. Word has length 16 [2023-11-23 21:11:10,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:10,037 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 105 transitions. [2023-11-23 21:11:10,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:10,038 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 105 transitions. [2023-11-23 21:11:10,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:11:10,039 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:10,039 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:10,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:10,239 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:11:10,240 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:10,240 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:10,240 INFO L85 PathProgramCache]: Analyzing trace with hash -850230411, now seen corresponding path program 7 times [2023-11-23 21:11:10,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:10,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483845675] [2023-11-23 21:11:10,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:10,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:10,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:10,396 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:11:10,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:10,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483845675] [2023-11-23 21:11:10,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483845675] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:10,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [899283323] [2023-11-23 21:11:10,397 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:11:10,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:10,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:10,398 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:10,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:11:10,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:10,458 INFO L262 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-23 21:11:10,459 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:10,536 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:11:10,536 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:10,731 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:11:10,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [899283323] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:10,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1326143966] [2023-11-23 21:11:10,733 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:10,734 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:10,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:10,734 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:10,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:10,839 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:11,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3199#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:11,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:11,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:11,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 23 [2023-11-23 21:11:11,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207087498] [2023-11-23 21:11:11,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:11,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-23 21:11:11,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:11,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-23 21:11:11,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=595, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:11:11,006 INFO L87 Difference]: Start difference. First operand 73 states and 105 transitions. Second operand has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:11,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:11,469 INFO L93 Difference]: Finished difference Result 148 states and 199 transitions. [2023-11-23 21:11:11,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-23 21:11:11,470 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-23 21:11:11,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:11,471 INFO L225 Difference]: With dead ends: 148 [2023-11-23 21:11:11,471 INFO L226 Difference]: Without dead ends: 113 [2023-11-23 21:11:11,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2023-11-23 21:11:11,473 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 25 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:11,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 34 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:11:11,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-23 21:11:11,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 91. [2023-11-23 21:11:11,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.4555555555555555) internal successors, (131), 90 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:11,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 131 transitions. [2023-11-23 21:11:11,541 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 131 transitions. Word has length 17 [2023-11-23 21:11:11,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:11,541 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 131 transitions. [2023-11-23 21:11:11,542 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 23 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:11,542 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 131 transitions. [2023-11-23 21:11:11,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:11:11,543 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:11,543 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:11,563 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:11,750 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:11,750 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:11,750 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:11,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1384460789, now seen corresponding path program 8 times [2023-11-23 21:11:11,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:11,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756117515] [2023-11-23 21:11:11,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:11,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:11,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:12,573 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:12,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:12,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756117515] [2023-11-23 21:11:12,573 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756117515] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:12,573 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714225265] [2023-11-23 21:11:12,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:11:12,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:12,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:12,575 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:12,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 21:11:12,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:11:12,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:11:12,688 WARN L260 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-23 21:11:12,690 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:13,370 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:14,251 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:14,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714225265] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:14,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1032491363] [2023-11-23 21:11:14,254 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:14,254 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:14,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:14,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:14,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:14,345 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:14,547 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3814#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:14,548 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:14,548 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:14,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13] total 35 [2023-11-23 21:11:14,548 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298322468] [2023-11-23 21:11:14,548 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:14,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-11-23 21:11:14,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:14,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-11-23 21:11:14,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 21:11:14,551 INFO L87 Difference]: Start difference. First operand 91 states and 131 transitions. Second operand has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:17,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:17,832 INFO L93 Difference]: Finished difference Result 155 states and 198 transitions. [2023-11-23 21:11:17,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-23 21:11:17,833 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-23 21:11:17,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:17,834 INFO L225 Difference]: With dead ends: 155 [2023-11-23 21:11:17,834 INFO L226 Difference]: Without dead ends: 132 [2023-11-23 21:11:17,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=347, Invalid=2623, Unknown=0, NotChecked=0, Total=2970 [2023-11-23 21:11:17,836 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 44 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:17,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 74 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 21:11:17,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-23 21:11:17,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 82. [2023-11-23 21:11:17,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.4691358024691359) internal successors, (119), 81 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:17,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 119 transitions. [2023-11-23 21:11:17,899 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 119 transitions. Word has length 18 [2023-11-23 21:11:17,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:17,899 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 119 transitions. [2023-11-23 21:11:17,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 35 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:17,900 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 119 transitions. [2023-11-23 21:11:17,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:11:17,901 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:17,901 INFO L195 NwaCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:17,916 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:18,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:18,103 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:18,103 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:18,104 INFO L85 PathProgramCache]: Analyzing trace with hash 1491660835, now seen corresponding path program 9 times [2023-11-23 21:11:18,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:18,104 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410278723] [2023-11-23 21:11:18,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:18,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:18,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:18,421 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:11:18,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:18,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410278723] [2023-11-23 21:11:18,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410278723] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:18,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364679075] [2023-11-23 21:11:18,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:11:18,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:18,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:18,426 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:18,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-23 21:11:18,491 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:11:18,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:11:18,493 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-23 21:11:18,494 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:18,535 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:11:18,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:18,911 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 67 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:11:18,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364679075] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:18,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69567175] [2023-11-23 21:11:18,915 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:18,915 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:18,916 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:18,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:18,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:19,035 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:19,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4443#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:19,186 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:19,186 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:19,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2023-11-23 21:11:19,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276768009] [2023-11-23 21:11:19,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:19,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-23 21:11:19,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:19,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-23 21:11:19,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=947, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 21:11:19,197 INFO L87 Difference]: Start difference. First operand 82 states and 119 transitions. Second operand has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:33,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:33,515 INFO L93 Difference]: Finished difference Result 257 states and 365 transitions. [2023-11-23 21:11:33,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2023-11-23 21:11:33,516 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-23 21:11:33,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:33,518 INFO L225 Difference]: With dead ends: 257 [2023-11-23 21:11:33,518 INFO L226 Difference]: Without dead ends: 239 [2023-11-23 21:11:33,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=4082, Invalid=11668, Unknown=0, NotChecked=0, Total=15750 [2023-11-23 21:11:33,525 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 678 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 394 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 678 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 1159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 394 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:33,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [678 Valid, 59 Invalid, 1159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [394 Valid, 765 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-11-23 21:11:33,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2023-11-23 21:11:33,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 92. [2023-11-23 21:11:33,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.4395604395604396) internal successors, (131), 91 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:33,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 131 transitions. [2023-11-23 21:11:33,604 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 131 transitions. Word has length 19 [2023-11-23 21:11:33,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:33,604 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 131 transitions. [2023-11-23 21:11:33,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:33,604 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 131 transitions. [2023-11-23 21:11:33,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:11:33,605 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:33,605 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:33,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:33,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:33,806 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:33,806 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:33,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1857574261, now seen corresponding path program 10 times [2023-11-23 21:11:33,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:33,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424570352] [2023-11-23 21:11:33,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:33,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:33,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:34,008 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:11:34,009 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:34,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424570352] [2023-11-23 21:11:34,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424570352] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:34,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817555217] [2023-11-23 21:11:34,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:11:34,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:34,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:34,011 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:34,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-23 21:11:34,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:34,068 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 32 conjunts are in the unsatisfiable core [2023-11-23 21:11:34,069 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:34,168 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:11:34,169 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:34,488 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:11:34,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1817555217] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:34,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511291828] [2023-11-23 21:11:34,491 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:34,491 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:34,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:34,491 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:34,492 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:34,597 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:34,739 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5452#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:34,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:34,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:34,740 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 28 [2023-11-23 21:11:34,740 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515282819] [2023-11-23 21:11:34,740 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:34,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-23 21:11:34,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:34,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-23 21:11:34,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=853, Unknown=0, NotChecked=0, Total=992 [2023-11-23 21:11:34,743 INFO L87 Difference]: Start difference. First operand 92 states and 131 transitions. Second operand has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:35,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:11:35,570 INFO L93 Difference]: Finished difference Result 172 states and 227 transitions. [2023-11-23 21:11:35,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-23 21:11:35,571 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-23 21:11:35,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:11:35,572 INFO L225 Difference]: With dead ends: 172 [2023-11-23 21:11:35,572 INFO L226 Difference]: Without dead ends: 131 [2023-11-23 21:11:35,574 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=208, Invalid=1274, Unknown=0, NotChecked=0, Total=1482 [2023-11-23 21:11:35,574 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 30 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:11:35,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 48 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:11:35,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-11-23 21:11:35,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 106. [2023-11-23 21:11:35,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.4095238095238096) internal successors, (148), 105 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:35,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 148 transitions. [2023-11-23 21:11:35,651 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 148 transitions. Word has length 20 [2023-11-23 21:11:35,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:11:35,651 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 148 transitions. [2023-11-23 21:11:35,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:11:35,652 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 148 transitions. [2023-11-23 21:11:35,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 21:11:35,652 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:11:35,652 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1] [2023-11-23 21:11:35,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-11-23 21:11:35,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 21:11:35,853 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:11:35,854 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:11:35,854 INFO L85 PathProgramCache]: Analyzing trace with hash -670240061, now seen corresponding path program 11 times [2023-11-23 21:11:35,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:11:35,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200487843] [2023-11-23 21:11:35,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:11:35,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:11:35,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:11:36,776 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:36,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:11:36,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200487843] [2023-11-23 21:11:36,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200487843] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:11:36,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064009599] [2023-11-23 21:11:36,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:11:36,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:11:36,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:11:36,778 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:11:36,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_99653940-8fd4-498d-b850-097297b11c54/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-11-23 21:11:36,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-23 21:11:36,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:11:36,878 WARN L260 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 56 conjunts are in the unsatisfiable core [2023-11-23 21:11:36,879 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:11:37,479 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:37,479 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:11:38,305 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:11:38,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064009599] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:11:38,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70961437] [2023-11-23 21:11:38,307 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-23 21:11:38,307 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:11:38,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:11:38,308 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:11:38,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:11:38,406 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:11:38,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6167#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod |ULTIMATE.start_main_~n~0#1| 4294967296) (mod |ULTIMATE.start_main_~z~0#1| 4294967296))) (<= (mod |ULTIMATE.start_main_~y~0#1| 4294967296) 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-23 21:11:38,597 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:11:38,597 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:11:38,597 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 37 [2023-11-23 21:11:38,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577222391] [2023-11-23 21:11:38,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:11:38,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-11-23 21:11:38,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:11:38,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-11-23 21:11:38,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=1557, Unknown=0, NotChecked=0, Total=1722 [2023-11-23 21:11:38,600 INFO L87 Difference]: Start difference. First operand 106 states and 148 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 37 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)