./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ --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 f26bb7c01ef96852e13a34034142a6eda53bd301e224804a84caad37f299321b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:24:04,907 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:24:05,052 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:24:05,063 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:24:05,066 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:24:05,112 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:24:05,113 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:24:05,114 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:24:05,115 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:24:05,121 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:24:05,122 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:24:05,123 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:24:05,123 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:24:05,125 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:24:05,126 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:24:05,127 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:24:05,127 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:24:05,128 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:24:05,128 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:24:05,129 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:24:05,129 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:24:05,130 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:24:05,131 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:24:05,132 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:24:05,132 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:24:05,133 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:24:05,133 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:24:05,134 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:24:05,134 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:24:05,135 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:24:05,136 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:24:05,137 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:24:05,137 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:24:05,137 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:24:05,138 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:24:05,138 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:24:05,138 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:24:05,139 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:24:05,139 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:24:05,139 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:24:05,140 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:24:05,141 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:24:05,141 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:24:05,141 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:24:05,142 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:24:05,142 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_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f26bb7c01ef96852e13a34034142a6eda53bd301e224804a84caad37f299321b [2023-11-19 05:24:05,465 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:24:05,506 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:24:05,509 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:24:05,510 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:24:05,511 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:24:05,513 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i [2023-11-19 05:24:08,629 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:24:08,918 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:24:08,919 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i [2023-11-19 05:24:08,928 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/data/b9c52fdae/385080a3b13b4d4481fff2b61c104221/FLAG8bc1e81ea [2023-11-19 05:24:08,948 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/data/b9c52fdae/385080a3b13b4d4481fff2b61c104221 [2023-11-19 05:24:08,951 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:24:08,953 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:24:08,955 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:24:08,955 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:24:08,962 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:24:08,963 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:24:08" (1/1) ... [2023-11-19 05:24:08,964 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d0a53bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:08, skipping insertion in model container [2023-11-19 05:24:08,964 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:24:08" (1/1) ... [2023-11-19 05:24:08,997 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:24:09,221 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_91effd58-5dad-4d41-8bb6-c123a87167a5/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i[951,964] [2023-11-19 05:24:09,250 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:24:09,263 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:24:09,284 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_91effd58-5dad-4d41-8bb6-c123a87167a5/sv-benchmarks/c/nla-digbench-scaling/divbin2_unwindbound100.i[951,964] [2023-11-19 05:24:09,295 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:24:09,313 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:24:09,314 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09 WrapperNode [2023-11-19 05:24:09,315 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:24:09,317 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:24:09,318 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:24:09,318 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:24:09,327 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,338 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,365 INFO L138 Inliner]: procedures = 16, calls = 8, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 51 [2023-11-19 05:24:09,366 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:24:09,367 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:24:09,367 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:24:09,367 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:24:09,378 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,379 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,385 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,385 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,388 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,401 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,403 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,411 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,413 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:24:09,414 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:24:09,414 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:24:09,415 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:24:09,415 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (1/1) ... [2023-11-19 05:24:09,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:24:09,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:09,461 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:24:09,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:24:09,511 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:24:09,511 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:24:09,512 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:24:09,512 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:24:09,512 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:24:09,512 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:24:09,598 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:24:09,602 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:24:09,855 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:24:09,949 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:24:09,950 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-19 05:24:09,956 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:24:09 BoogieIcfgContainer [2023-11-19 05:24:09,958 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:24:09,962 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:24:09,963 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:24:09,967 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:24:09,968 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:24:08" (1/3) ... [2023-11-19 05:24:09,969 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66fbd64a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:24:09, skipping insertion in model container [2023-11-19 05:24:09,970 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:24:09" (2/3) ... [2023-11-19 05:24:09,971 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66fbd64a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:24:09, skipping insertion in model container [2023-11-19 05:24:09,971 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:24:09" (3/3) ... [2023-11-19 05:24:09,973 INFO L112 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound100.i [2023-11-19 05:24:09,998 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:24:09,998 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:24:10,054 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:24:10,062 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;@1bb7ab7c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:24:10,063 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:24:10,068 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:10,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:24:10,076 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:10,077 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:10,078 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:10,084 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:10,085 INFO L85 PathProgramCache]: Analyzing trace with hash 774102990, now seen corresponding path program 1 times [2023-11-19 05:24:10,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:10,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165374044] [2023-11-19 05:24:10,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:10,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:10,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165374044] [2023-11-19 05:24:10,227 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:24:10,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947695060] [2023-11-19 05:24:10,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:10,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:10,231 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:10,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:24:10,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,304 INFO L262 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 05:24:10,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:10,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:10,332 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:24:10,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947695060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:10,333 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:10,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:24:10,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019324259] [2023-11-19 05:24:10,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:10,342 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:24:10,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:10,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:24:10,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:24:10,379 INFO L87 Difference]: Start difference. First operand has 17 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:10,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:10,441 INFO L93 Difference]: Finished difference Result 30 states and 43 transitions. [2023-11-19 05:24:10,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:24:10,445 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:24:10,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:10,453 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:24:10,453 INFO L226 Difference]: Without dead ends: 15 [2023-11-19 05:24:10,456 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:24:10,461 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:10,462 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:24:10,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-19 05:24:10,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-19 05:24:10,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:24:10,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-11-19 05:24:10,504 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 7 [2023-11-19 05:24:10,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:10,505 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-11-19 05:24:10,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:10,506 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-11-19 05:24:10,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:24:10,507 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:10,507 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:10,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:10,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:24:10,729 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:10,731 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:10,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1084410172, now seen corresponding path program 1 times [2023-11-19 05:24:10,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:10,732 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746673123] [2023-11-19 05:24:10,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:10,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:10,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746673123] [2023-11-19 05:24:10,791 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:24:10,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117033901] [2023-11-19 05:24:10,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:10,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:10,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:10,799 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:10,800 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:24:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:10,861 INFO L262 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:24:10,863 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:10,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:10,912 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:24:10,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117033901] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:10,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:10,913 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:24:10,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139691775] [2023-11-19 05:24:10,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:10,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:24:10,914 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:10,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:24:10,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:24:10,916 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:10,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:10,957 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2023-11-19 05:24:10,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:24:10,958 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:24:10,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:10,958 INFO L225 Difference]: With dead ends: 28 [2023-11-19 05:24:10,959 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:24:10,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:24:10,961 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:10,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 43 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:24:10,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:24:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:24:10,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:24:10,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-19 05:24:10,972 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2023-11-19 05:24:10,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:10,972 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-19 05:24:10,973 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-19 05:24:10,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:24:10,974 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:10,974 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:11,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:11,197 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:11,197 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:11,198 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:11,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1068718015, now seen corresponding path program 1 times [2023-11-19 05:24:11,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:11,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1150579737] [2023-11-19 05:24:11,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:11,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:11,218 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:11,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1277753919] [2023-11-19 05:24:11,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:11,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:11,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:11,224 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:11,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:24:11,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:11,285 INFO L262 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:24:11,286 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:11,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:11,327 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:24:11,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:11,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1150579737] [2023-11-19 05:24:11,327 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:11,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277753919] [2023-11-19 05:24:11,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277753919] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:11,328 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:11,328 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:24:11,329 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214661849] [2023-11-19 05:24:11,329 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:11,329 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:24:11,330 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:11,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:24:11,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:24:11,331 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:11,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:11,366 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2023-11-19 05:24:11,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:24:11,367 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:24:11,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:11,368 INFO L225 Difference]: With dead ends: 28 [2023-11-19 05:24:11,369 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:24:11,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:24:11,371 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:11,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 55 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:24:11,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:24:11,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-11-19 05:24:11,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:24:11,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2023-11-19 05:24:11,379 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 10 [2023-11-19 05:24:11,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:11,379 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2023-11-19 05:24:11,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:11,380 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2023-11-19 05:24:11,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:24:11,381 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:11,381 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:11,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:11,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:11,605 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:11,606 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:11,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1066930555, now seen corresponding path program 1 times [2023-11-19 05:24:11,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:11,607 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920953122] [2023-11-19 05:24:11,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:11,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:11,629 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:11,630 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [544244912] [2023-11-19 05:24:11,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:11,630 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:11,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:11,632 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:11,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:24:11,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:11,679 INFO L262 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:24:11,681 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:11,764 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:11,764 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:24:11,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:11,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920953122] [2023-11-19 05:24:11,765 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:11,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544244912] [2023-11-19 05:24:11,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544244912] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:11,766 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:24:11,766 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:24:11,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776716282] [2023-11-19 05:24:11,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:11,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:24:11,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:11,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:24:11,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:24:11,769 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:11,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:11,825 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2023-11-19 05:24:11,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:24:11,826 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:24:11,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:11,827 INFO L225 Difference]: With dead ends: 31 [2023-11-19 05:24:11,827 INFO L226 Difference]: Without dead ends: 28 [2023-11-19 05:24:11,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:24:11,834 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 9 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:11,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 44 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:24:11,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-11-19 05:24:11,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2023-11-19 05:24:11,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:11,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2023-11-19 05:24:11,849 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 10 [2023-11-19 05:24:11,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:11,849 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2023-11-19 05:24:11,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:24:11,850 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2023-11-19 05:24:11,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 05:24:11,851 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:11,851 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:11,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:12,069 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:12,069 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:12,070 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:12,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1343356900, now seen corresponding path program 1 times [2023-11-19 05:24:12,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:12,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789309169] [2023-11-19 05:24:12,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:12,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:12,091 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:12,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1377265603] [2023-11-19 05:24:12,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:12,091 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:12,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:12,093 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:12,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:24:12,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:12,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:24:12,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:12,194 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:12,194 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:12,259 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:12,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:12,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789309169] [2023-11-19 05:24:12,259 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:12,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377265603] [2023-11-19 05:24:12,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377265603] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:12,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891774007] [2023-11-19 05:24:12,280 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:24:12,281 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:12,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:12,291 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:12,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:12,839 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2023-11-19 05:24:12,898 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:13,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1891774007] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:24:13,489 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:13,490 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 6] total 18 [2023-11-19 05:24:13,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484050092] [2023-11-19 05:24:13,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:24:13,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:24:13,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:13,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:24:13,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2023-11-19 05:24:13,498 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:24:13,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:13,654 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2023-11-19 05:24:13,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:24:13,655 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2023-11-19 05:24:13,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:13,657 INFO L225 Difference]: With dead ends: 45 [2023-11-19 05:24:13,658 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:24:13,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=92, Invalid=214, Unknown=0, NotChecked=0, Total=306 [2023-11-19 05:24:13,660 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:13,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:24:13,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:24:13,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 05:24:13,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:13,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2023-11-19 05:24:13,673 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 18 [2023-11-19 05:24:13,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:13,673 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2023-11-19 05:24:13,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:24:13,674 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2023-11-19 05:24:13,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:24:13,675 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:13,675 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:13,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:13,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:13,897 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:13,897 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:13,898 INFO L85 PathProgramCache]: Analyzing trace with hash 1830622537, now seen corresponding path program 1 times [2023-11-19 05:24:13,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:13,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [381464439] [2023-11-19 05:24:13,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:13,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:13,927 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:13,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [26682001] [2023-11-19 05:24:13,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:13,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:13,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:13,931 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:13,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:24:13,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:13,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:24:13,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:14,038 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 05:24:14,039 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:14,079 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:24:14,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:14,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [381464439] [2023-11-19 05:24:14,079 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:14,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26682001] [2023-11-19 05:24:14,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26682001] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:14,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1989710773] [2023-11-19 05:24:14,085 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:24:14,085 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:14,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:14,086 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:14,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:15,478 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-19 05:24:15,483 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:19,258 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '733#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:24:19,259 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:19,259 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:19,259 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8 [2023-11-19 05:24:19,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681861685] [2023-11-19 05:24:19,259 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:19,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:24:19,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:19,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:24:19,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=294, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:24:19,261 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:24:19,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:19,363 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2023-11-19 05:24:19,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:24:19,364 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-11-19 05:24:19,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:19,366 INFO L225 Difference]: With dead ends: 63 [2023-11-19 05:24:19,368 INFO L226 Difference]: Without dead ends: 44 [2023-11-19 05:24:19,369 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:24:19,369 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 11 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:19,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 79 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:24:19,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-19 05:24:19,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2023-11-19 05:24:19,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.25) internal successors, (35), 29 states have internal predecessors, (35), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:19,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2023-11-19 05:24:19,381 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 20 [2023-11-19 05:24:19,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:19,381 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2023-11-19 05:24:19,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 1 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:24:19,382 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2023-11-19 05:24:19,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:24:19,383 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:19,384 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:19,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:19,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:19,609 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:19,609 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:19,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1579561542, now seen corresponding path program 1 times [2023-11-19 05:24:19,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:19,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570943669] [2023-11-19 05:24:19,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:19,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:19,635 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:19,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1469075571] [2023-11-19 05:24:19,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:19,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:19,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:19,637 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:19,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:24:19,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:19,698 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:24:19,699 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:19,745 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:19,745 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:24:19,808 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:19,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:24:19,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570943669] [2023-11-19 05:24:19,809 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:24:19,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469075571] [2023-11-19 05:24:19,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469075571] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:24:19,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077820837] [2023-11-19 05:24:19,812 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:24:19,813 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:24:19,813 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:24:19,813 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:24:19,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:24:20,742 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-19 05:24:20,746 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:24:27,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1015#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:24:27,373 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:24:27,373 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:24:27,373 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 12 [2023-11-19 05:24:27,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226397328] [2023-11-19 05:24:27,374 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:24:27,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:24:27,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:24:27,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:24:27,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=428, Unknown=2, NotChecked=0, Total=506 [2023-11-19 05:24:27,376 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:27,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:24:27,687 INFO L93 Difference]: Finished difference Result 140 states and 161 transitions. [2023-11-19 05:24:27,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 05:24:27,688 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-11-19 05:24:27,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:24:27,690 INFO L225 Difference]: With dead ends: 140 [2023-11-19 05:24:27,690 INFO L226 Difference]: Without dead ends: 133 [2023-11-19 05:24:27,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=118, Invalid=636, Unknown=2, NotChecked=0, Total=756 [2023-11-19 05:24:27,692 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 68 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:24:27,693 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 99 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:24:27,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-11-19 05:24:27,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 119. [2023-11-19 05:24:27,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 91 states have (on average 1.2197802197802199) internal successors, (111), 96 states have internal predecessors, (111), 16 states have call successors, (16), 11 states have call predecessors, (16), 11 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-19 05:24:27,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 138 transitions. [2023-11-19 05:24:27,713 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 138 transitions. Word has length 21 [2023-11-19 05:24:27,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:24:27,714 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 138 transitions. [2023-11-19 05:24:27,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 12 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:24:27,715 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 138 transitions. [2023-11-19 05:24:27,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:24:27,716 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:24:27,716 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:24:27,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:24:27,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:27,929 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:24:27,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:24:27,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1577774082, now seen corresponding path program 1 times [2023-11-19 05:24:27,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:24:27,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014863648] [2023-11-19 05:24:27,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:27,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:24:27,947 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:24:27,948 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1626089542] [2023-11-19 05:24:27,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:24:27,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:24:27,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:24:27,953 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:24:27,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91effd58-5dad-4d41-8bb6-c123a87167a5/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:24:28,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:24:28,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 05:24:28,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:24:28,473 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:24:28,473 INFO L327 TraceCheckSpWp]: Computing backward predicates...