./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/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_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench/egcd3-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/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_40e1db1d-3413-425c-b5d8-a95f13f27fcc/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 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:05:44,263 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:05:44,395 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:05:44,403 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:05:44,404 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:05:44,444 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:05:44,445 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:05:44,445 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:05:44,446 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:05:44,451 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:05:44,456 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:05:44,456 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:05:44,457 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:05:44,459 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:05:44,459 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:05:44,459 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:05:44,460 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:05:44,460 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:05:44,461 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:05:44,461 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:05:44,462 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:05:44,462 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:05:44,463 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:05:44,464 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:05:44,464 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:05:44,465 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:05:44,465 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:05:44,466 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:05:44,466 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:05:44,466 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:05:44,468 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:05:44,468 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:05:44,468 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:05:44,469 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:05:44,469 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:05:44,469 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:05:44,469 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:05:44,470 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:05:44,470 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:05:44,470 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:05:44,470 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:05:44,471 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:05:44,471 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:05:44,471 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:05:44,472 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:05:44,472 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_40e1db1d-3413-425c-b5d8-a95f13f27fcc/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ef08007570a64191e0df13d14d3e8d62a8022f43f46779ea6f6701a621376be [2023-11-19 05:05:44,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:05:44,844 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:05:44,847 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:05:44,848 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:05:44,849 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:05:44,851 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/nla-digbench/egcd3-ll.c [2023-11-19 05:05:47,929 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:05:48,207 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:05:48,207 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/sv-benchmarks/c/nla-digbench/egcd3-ll.c [2023-11-19 05:05:48,218 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/data/ac651c24e/7fa2c369b3a945af95724d46bc2907f6/FLAG30be11cf9 [2023-11-19 05:05:48,238 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/data/ac651c24e/7fa2c369b3a945af95724d46bc2907f6 [2023-11-19 05:05:48,244 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:05:48,246 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:05:48,249 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:05:48,250 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:05:48,256 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:05:48,257 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,258 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3003530d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48, skipping insertion in model container [2023-11-19 05:05:48,258 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,290 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:05:48,506 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_40e1db1d-3413-425c-b5d8-a95f13f27fcc/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2023-11-19 05:05:48,552 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:05:48,565 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:05:48,584 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_40e1db1d-3413-425c-b5d8-a95f13f27fcc/sv-benchmarks/c/nla-digbench/egcd3-ll.c[490,503] [2023-11-19 05:05:48,620 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:05:48,642 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:05:48,643 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48 WrapperNode [2023-11-19 05:05:48,643 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:05:48,646 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:05:48,646 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:05:48,646 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:05:48,655 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,665 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,696 INFO L138 Inliner]: procedures = 14, calls = 14, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 81 [2023-11-19 05:05:48,696 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:05:48,698 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:05:48,698 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:05:48,698 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:05:48,710 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,710 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,722 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,724 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,728 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,739 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,742 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,748 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,751 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:05:48,752 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:05:48,754 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:05:48,755 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:05:48,756 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (1/1) ... [2023-11-19 05:05:48,762 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:05:48,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:48,791 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:05:48,802 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:05:48,833 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:05:48,833 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:05:48,833 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:05:48,833 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:05:48,834 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:05:48,834 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:05:48,836 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:05:48,837 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:05:48,938 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:05:48,941 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:05:49,166 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:05:49,197 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:05:49,198 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:05:49,202 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:05:49 BoogieIcfgContainer [2023-11-19 05:05:49,203 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:05:49,205 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:05:49,206 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:05:49,209 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:05:49,209 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:05:48" (1/3) ... [2023-11-19 05:05:49,210 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ac8a330 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:05:49, skipping insertion in model container [2023-11-19 05:05:49,210 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:48" (2/3) ... [2023-11-19 05:05:49,211 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ac8a330 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:05:49, skipping insertion in model container [2023-11-19 05:05:49,211 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:05:49" (3/3) ... [2023-11-19 05:05:49,212 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd3-ll.c [2023-11-19 05:05:49,234 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:05:49,234 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:05:49,284 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:05:49,291 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;@3a179d2c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:05:49,292 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:05:49,297 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-19 05:05:49,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:05:49,307 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:49,308 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:49,309 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:49,318 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:49,319 INFO L85 PathProgramCache]: Analyzing trace with hash 1524023292, now seen corresponding path program 1 times [2023-11-19 05:05:49,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:49,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280828776] [2023-11-19 05:05:49,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:49,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:49,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:49,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:49,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280828776] [2023-11-19 05:05:49,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-19 05:05:49,476 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888756930] [2023-11-19 05:05:49,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:49,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:49,477 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:49,480 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:49,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:05:49,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:49,593 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-19 05:05:49,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:49,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:49,623 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:05:49,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888756930] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:49,624 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:05:49,624 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:05:49,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489398789] [2023-11-19 05:05:49,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:49,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 05:05:49,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:49,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 05:05:49,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 05:05:49,666 INFO L87 Difference]: Start difference. First operand has 27 states, 16 states have (on average 1.5) internal successors, (24), 17 states have internal predecessors, (24), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:05:49,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:49,701 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2023-11-19 05:05:49,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 05:05:49,705 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 13 [2023-11-19 05:05:49,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:49,715 INFO L225 Difference]: With dead ends: 48 [2023-11-19 05:05:49,715 INFO L226 Difference]: Without dead ends: 25 [2023-11-19 05:05:49,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 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 05:05:49,725 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:49,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:05:49,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-19 05:05:49,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-19 05:05:49,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-19 05:05:49,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2023-11-19 05:05:49,779 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 13 [2023-11-19 05:05:49,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:49,781 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2023-11-19 05:05:49,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:05:49,783 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2023-11-19 05:05:49,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:05:49,787 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:49,787 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:49,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:50,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-19 05:05:50,009 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:50,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:50,010 INFO L85 PathProgramCache]: Analyzing trace with hash 1500233354, now seen corresponding path program 1 times [2023-11-19 05:05:50,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:50,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951942926] [2023-11-19 05:05:50,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:50,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:50,046 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:50,046 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [3401842] [2023-11-19 05:05:50,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:50,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:50,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:50,055 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:50,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:05:50,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:50,154 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 05:05:50,158 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:50,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:50,472 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:05:50,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:50,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951942926] [2023-11-19 05:05:50,477 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:50,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3401842] [2023-11-19 05:05:50,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3401842] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:50,479 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:05:50,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:05:50,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763772385] [2023-11-19 05:05:50,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:50,481 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:05:50,482 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:50,483 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:05:50,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:05:50,484 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:05:50,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:50,658 INFO L93 Difference]: Finished difference Result 44 states and 57 transitions. [2023-11-19 05:05:50,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:05:50,659 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 14 [2023-11-19 05:05:50,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:50,661 INFO L225 Difference]: With dead ends: 44 [2023-11-19 05:05:50,661 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:05:50,662 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:05:50,663 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 14 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:50,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 99 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:05:50,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:05:50,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2023-11-19 05:05:50,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.24) internal successors, (31), 26 states have internal predecessors, (31), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 05:05:50,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2023-11-19 05:05:50,680 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 14 [2023-11-19 05:05:50,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:50,681 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2023-11-19 05:05:50,681 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-19 05:05:50,681 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2023-11-19 05:05:50,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 05:05:50,682 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:50,683 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:50,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:50,896 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:50,896 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:50,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:50,898 INFO L85 PathProgramCache]: Analyzing trace with hash -377003451, now seen corresponding path program 1 times [2023-11-19 05:05:50,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:50,899 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099088421] [2023-11-19 05:05:50,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:50,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:50,916 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:50,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1720340420] [2023-11-19 05:05:50,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:50,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:50,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:50,918 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:50,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:05:50,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:50,991 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:05:50,993 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:51,083 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:05:51,083 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:51,193 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:05:51,193 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:51,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099088421] [2023-11-19 05:05:51,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:51,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720340420] [2023-11-19 05:05:51,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720340420] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:51,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2042592084] [2023-11-19 05:05:51,217 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:05:51,218 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:51,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:51,228 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:51,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:52,282 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2023-11-19 05:05:52,346 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:53,591 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2042592084] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:53,591 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:53,592 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 7] total 15 [2023-11-19 05:05:53,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482836504] [2023-11-19 05:05:53,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:53,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-19 05:05:53,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:53,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-19 05:05:53,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:05:53,595 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:05:53,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:53,914 INFO L93 Difference]: Finished difference Result 78 states and 108 transitions. [2023-11-19 05:05:53,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:05:53,915 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2023-11-19 05:05:53,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:53,917 INFO L225 Difference]: With dead ends: 78 [2023-11-19 05:05:53,917 INFO L226 Difference]: Without dead ends: 71 [2023-11-19 05:05:53,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 38 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:05:53,919 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 58 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:53,919 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 51 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:05:53,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-11-19 05:05:53,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 47. [2023-11-19 05:05:53,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-11-19 05:05:53,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 61 transitions. [2023-11-19 05:05:53,952 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 61 transitions. Word has length 19 [2023-11-19 05:05:53,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:53,953 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 61 transitions. [2023-11-19 05:05:53,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:05:53,953 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 61 transitions. [2023-11-19 05:05:53,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:05:53,954 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:53,954 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:53,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:54,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:54,168 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:54,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:54,169 INFO L85 PathProgramCache]: Analyzing trace with hash -632778532, now seen corresponding path program 1 times [2023-11-19 05:05:54,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:54,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085914239] [2023-11-19 05:05:54,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:54,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:54,183 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:54,183 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [96279085] [2023-11-19 05:05:54,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:54,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:54,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:54,186 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:54,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:05:54,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:54,260 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 05:05:54,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:54,367 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:54,367 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:54,507 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:54,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:54,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085914239] [2023-11-19 05:05:54,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:54,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96279085] [2023-11-19 05:05:54,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96279085] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:54,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [376187431] [2023-11-19 05:05:54,512 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-19 05:05:54,512 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:54,512 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:54,513 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:54,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:55,530 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 88 for LOIs [2023-11-19 05:05:55,709 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2023-11-19 05:05:55,751 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:58,239 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [376187431] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:58,240 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:58,240 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [6, 6] total 19 [2023-11-19 05:05:58,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220432003] [2023-11-19 05:05:58,241 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:58,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:05:58,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:58,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:05:58,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:05:58,243 INFO L87 Difference]: Start difference. First operand 47 states and 61 transitions. Second operand has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:05:58,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:58,901 INFO L93 Difference]: Finished difference Result 91 states and 130 transitions. [2023-11-19 05:05:58,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:05:58,903 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2023-11-19 05:05:58,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:58,905 INFO L225 Difference]: With dead ends: 91 [2023-11-19 05:05:58,905 INFO L226 Difference]: Without dead ends: 89 [2023-11-19 05:05:58,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:05:58,907 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 66 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:58,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 52 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:05:58,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-19 05:05:58,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 82. [2023-11-19 05:05:58,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 49 states have internal predecessors, (58), 31 states have call successors, (31), 4 states have call predecessors, (31), 4 states have return successors, (30), 28 states have call predecessors, (30), 30 states have call successors, (30) [2023-11-19 05:05:58,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 119 transitions. [2023-11-19 05:05:58,961 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 119 transitions. Word has length 22 [2023-11-19 05:05:58,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:58,961 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 119 transitions. [2023-11-19 05:05:58,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.3) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:05:58,961 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 119 transitions. [2023-11-19 05:05:58,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-19 05:05:58,964 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:58,964 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:58,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:59,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:59,168 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:59,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:59,169 INFO L85 PathProgramCache]: Analyzing trace with hash -143636076, now seen corresponding path program 1 times [2023-11-19 05:05:59,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:59,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207183720] [2023-11-19 05:05:59,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:59,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:59,184 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:59,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [275028995] [2023-11-19 05:05:59,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:59,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:59,185 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:59,186 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:59,224 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:05:59,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:59,274 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-19 05:05:59,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:00,275 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-19 05:06:00,275 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:06:00,952 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:06:00,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:06:00,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207183720] [2023-11-19 05:06:00,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:06:00,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275028995] [2023-11-19 05:06:00,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275028995] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:06:00,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [931818273] [2023-11-19 05:06:00,956 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-11-19 05:06:00,957 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:06:00,957 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:06:00,957 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:06:00,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:06:05,266 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:05,268 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:05,391 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:05,393 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:07,691 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-19 05:06:07,697 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2023-11-19 05:06:07,738 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:06:10,670 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1358#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:06:10,671 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:06:10,671 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:06:10,671 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 11] total 22 [2023-11-19 05:06:10,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559898060] [2023-11-19 05:06:10,672 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:06:10,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-19 05:06:10,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:06:10,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-19 05:06:10,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1519, Unknown=0, NotChecked=0, Total=1722 [2023-11-19 05:06:10,675 INFO L87 Difference]: Start difference. First operand 82 states and 119 transitions. Second operand has 22 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-19 05:06:15,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:06:15,607 INFO L93 Difference]: Finished difference Result 266 states and 399 transitions. [2023-11-19 05:06:15,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-19 05:06:15,610 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 44 [2023-11-19 05:06:15,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:06:15,619 INFO L225 Difference]: With dead ends: 266 [2023-11-19 05:06:15,619 INFO L226 Difference]: Without dead ends: 232 [2023-11-19 05:06:15,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1204 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=601, Invalid=3821, Unknown=0, NotChecked=0, Total=4422 [2023-11-19 05:06:15,625 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 162 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 519 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:06:15,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 298 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 519 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-11-19 05:06:15,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2023-11-19 05:06:15,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2023-11-19 05:06:15,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 102 states have (on average 1.2647058823529411) internal successors, (129), 104 states have internal predecessors, (129), 51 states have call successors, (51), 6 states have call predecessors, (51), 6 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-19 05:06:15,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 230 transitions. [2023-11-19 05:06:15,824 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 230 transitions. Word has length 44 [2023-11-19 05:06:15,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:06:15,825 INFO L495 AbstractCegarLoop]: Abstraction has 160 states and 230 transitions. [2023-11-19 05:06:15,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 6 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-19 05:06:15,825 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 230 transitions. [2023-11-19 05:06:15,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-19 05:06:15,835 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:06:15,836 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:06:15,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:06:16,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:16,048 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:06:16,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:06:16,049 INFO L85 PathProgramCache]: Analyzing trace with hash 583515831, now seen corresponding path program 1 times [2023-11-19 05:06:16,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:06:16,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135118183] [2023-11-19 05:06:16,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:16,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:06:16,074 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:06:16,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [542747203] [2023-11-19 05:06:16,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:16,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:16,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:06:16,077 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:06:16,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:06:16,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:06:16,143 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-19 05:06:16,146 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:16,215 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2023-11-19 05:06:16,215 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:06:16,287 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-11-19 05:06:16,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:06:16,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135118183] [2023-11-19 05:06:16,288 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:06:16,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542747203] [2023-11-19 05:06:16,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542747203] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-19 05:06:16,288 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:06:16,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2023-11-19 05:06:16,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842064832] [2023-11-19 05:06:16,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:06:16,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:06:16,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:06:16,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:06:16,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:06:16,291 INFO L87 Difference]: Start difference. First operand 160 states and 230 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:06:16,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:06:16,447 INFO L93 Difference]: Finished difference Result 174 states and 241 transitions. [2023-11-19 05:06:16,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:06:16,448 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 54 [2023-11-19 05:06:16,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:06:16,452 INFO L225 Difference]: With dead ends: 174 [2023-11-19 05:06:16,452 INFO L226 Difference]: Without dead ends: 172 [2023-11-19 05:06:16,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:06:16,454 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 6 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:06:16,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 87 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:06:16,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2023-11-19 05:06:16,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2023-11-19 05:06:16,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 111 states have (on average 1.2432432432432432) internal successors, (138), 113 states have internal predecessors, (138), 51 states have call successors, (51), 9 states have call predecessors, (51), 9 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-19 05:06:16,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 239 transitions. [2023-11-19 05:06:16,603 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 239 transitions. Word has length 54 [2023-11-19 05:06:16,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:06:16,609 INFO L495 AbstractCegarLoop]: Abstraction has 172 states and 239 transitions. [2023-11-19 05:06:16,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:06:16,610 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 239 transitions. [2023-11-19 05:06:16,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-19 05:06:16,613 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:06:16,613 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:06:16,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:06:16,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:16,816 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:06:16,817 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:06:16,817 INFO L85 PathProgramCache]: Analyzing trace with hash 658403814, now seen corresponding path program 1 times [2023-11-19 05:06:16,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:06:16,817 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066682918] [2023-11-19 05:06:16,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:16,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:06:16,832 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:06:16,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [533924378] [2023-11-19 05:06:16,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:16,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:16,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:06:16,837 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:06:16,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:06:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:06:16,897 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:06:16,899 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:16,959 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:06:16,960 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:06:17,042 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:06:17,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:06:17,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066682918] [2023-11-19 05:06:17,043 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:06:17,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533924378] [2023-11-19 05:06:17,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533924378] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:06:17,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814758469] [2023-11-19 05:06:17,046 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 05:06:17,046 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:06:17,047 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:06:17,047 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:06:17,047 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:06:20,337 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:20,338 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:20,438 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:20,438 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:22,803 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-19 05:06:22,808 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2023-11-19 05:06:22,839 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:06:24,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3280#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:06:24,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:06:24,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:06:24,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2023-11-19 05:06:24,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687024820] [2023-11-19 05:06:24,193 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:06:24,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:06:24,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:06:24,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:06:24,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=753, Unknown=0, NotChecked=0, Total=870 [2023-11-19 05:06:24,196 INFO L87 Difference]: Start difference. First operand 172 states and 239 transitions. Second operand has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:06:24,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:06:24,743 INFO L93 Difference]: Finished difference Result 326 states and 465 transitions. [2023-11-19 05:06:24,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:06:24,744 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 52 [2023-11-19 05:06:24,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:06:24,746 INFO L225 Difference]: With dead ends: 326 [2023-11-19 05:06:24,747 INFO L226 Difference]: Without dead ends: 224 [2023-11-19 05:06:24,749 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=199, Invalid=1283, Unknown=0, NotChecked=0, Total=1482 [2023-11-19 05:06:24,750 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 38 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:06:24,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 258 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:06:24,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-11-19 05:06:24,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 191. [2023-11-19 05:06:24,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 118 states have (on average 1.2033898305084745) internal successors, (142), 119 states have internal predecessors, (142), 63 states have call successors, (63), 9 states have call predecessors, (63), 9 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2023-11-19 05:06:24,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 267 transitions. [2023-11-19 05:06:24,891 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 267 transitions. Word has length 52 [2023-11-19 05:06:24,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:06:24,892 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 267 transitions. [2023-11-19 05:06:24,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.3333333333333335) internal successors, (40), 12 states have internal predecessors, (40), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-19 05:06:24,892 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 267 transitions. [2023-11-19 05:06:24,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-19 05:06:24,893 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:06:24,893 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:06:24,908 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:06:25,096 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:25,096 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:06:25,097 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:06:25,097 INFO L85 PathProgramCache]: Analyzing trace with hash -1948306734, now seen corresponding path program 2 times [2023-11-19 05:06:25,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:06:25,097 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241578392] [2023-11-19 05:06:25,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:25,097 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:06:25,110 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:06:25,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [861389447] [2023-11-19 05:06:25,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:06:25,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:25,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:06:25,112 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:06:25,140 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:06:25,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:06:25,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:06:25,187 INFO L262 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 05:06:25,190 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:25,398 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 8 proven. 19 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-19 05:06:25,398 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:06:25,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:06:25,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241578392] [2023-11-19 05:06:25,491 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:06:25,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861389447] [2023-11-19 05:06:25,491 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861389447] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:06:25,492 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1169750935] [2023-11-19 05:06:25,494 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-19 05:06:25,494 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:06:25,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:06:25,494 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:06:25,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:06:29,079 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:29,080 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:29,144 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:29,145 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:30,123 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:30,125 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:30,377 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:30,379 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 14 iterations. Over-approximation may be very coarse. [2023-11-19 05:06:33,134 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2023-11-19 05:06:33,138 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 62 for LOIs [2023-11-19 05:06:33,162 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:06:35,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4333#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:06:35,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:06:35,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:06:35,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2023-11-19 05:06:35,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22636845] [2023-11-19 05:06:35,032 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-19 05:06:35,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:06:35,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:06:35,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:06:35,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2023-11-19 05:06:35,034 INFO L87 Difference]: Start difference. First operand 191 states and 267 transitions. Second operand has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:06:35,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:06:35,385 INFO L93 Difference]: Finished difference Result 245 states and 330 transitions. [2023-11-19 05:06:35,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:06:35,386 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 52 [2023-11-19 05:06:35,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:06:35,388 INFO L225 Difference]: With dead ends: 245 [2023-11-19 05:06:35,388 INFO L226 Difference]: Without dead ends: 243 [2023-11-19 05:06:35,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2023-11-19 05:06:35,390 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 35 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:06:35,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 171 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:06:35,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2023-11-19 05:06:35,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 232. [2023-11-19 05:06:35,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 148 states have (on average 1.1891891891891893) internal successors, (176), 149 states have internal predecessors, (176), 71 states have call successors, (71), 12 states have call predecessors, (71), 12 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2023-11-19 05:06:35,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 317 transitions. [2023-11-19 05:06:35,563 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 317 transitions. Word has length 52 [2023-11-19 05:06:35,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:06:35,564 INFO L495 AbstractCegarLoop]: Abstraction has 232 states and 317 transitions. [2023-11-19 05:06:35,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.5) internal successors, (28), 7 states have internal predecessors, (28), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:06:35,564 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 317 transitions. [2023-11-19 05:06:35,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-19 05:06:35,565 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:06:35,565 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:06:35,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:06:35,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 05:06:35,766 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:06:35,766 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:06:35,766 INFO L85 PathProgramCache]: Analyzing trace with hash 1501893325, now seen corresponding path program 3 times [2023-11-19 05:06:35,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:06:35,767 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508856161] [2023-11-19 05:06:35,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:35,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:06:35,777 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:06:35,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [707000798] [2023-11-19 05:06:35,778 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:06:35,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:35,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:06:35,780 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:06:35,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:06:35,835 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:06:35,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:06:35,837 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:06:35,839 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:35,879 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-11-19 05:06:35,879 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:06:35,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:06:35,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508856161] [2023-11-19 05:06:35,880 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:06:35,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707000798] [2023-11-19 05:06:35,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707000798] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:06:35,880 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:06:35,880 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:06:35,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939731464] [2023-11-19 05:06:35,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:06:35,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:06:35,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:06:35,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:06:35,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:06:35,882 INFO L87 Difference]: Start difference. First operand 232 states and 317 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 05:06:36,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:06:36,176 INFO L93 Difference]: Finished difference Result 278 states and 386 transitions. [2023-11-19 05:06:36,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:06:36,177 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 57 [2023-11-19 05:06:36,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:06:36,180 INFO L225 Difference]: With dead ends: 278 [2023-11-19 05:06:36,180 INFO L226 Difference]: Without dead ends: 276 [2023-11-19 05:06:36,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 53 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 05:06:36,182 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 8 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:06:36,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 84 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:06:36,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2023-11-19 05:06:36,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 270. [2023-11-19 05:06:36,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 164 states have (on average 1.201219512195122) internal successors, (197), 165 states have internal predecessors, (197), 91 states have call successors, (91), 14 states have call predecessors, (91), 14 states have return successors, (90), 90 states have call predecessors, (90), 90 states have call successors, (90) [2023-11-19 05:06:36,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 378 transitions. [2023-11-19 05:06:36,445 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 378 transitions. Word has length 57 [2023-11-19 05:06:36,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:06:36,445 INFO L495 AbstractCegarLoop]: Abstraction has 270 states and 378 transitions. [2023-11-19 05:06:36,445 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 05:06:36,445 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 378 transitions. [2023-11-19 05:06:36,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-19 05:06:36,447 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:06:36,447 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:06:36,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:06:36,647 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-19 05:06:36,647 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:06:36,648 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:06:36,648 INFO L85 PathProgramCache]: Analyzing trace with hash -697498661, now seen corresponding path program 4 times [2023-11-19 05:06:36,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:06:36,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619635764] [2023-11-19 05:06:36,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:06:36,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:06:36,658 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:06:36,658 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1843772586] [2023-11-19 05:06:36,658 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:06:36,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:06:36,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:06:36,660 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:06:36,670 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40e1db1d-3413-425c-b5d8-a95f13f27fcc/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:06:36,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:06:36,731 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-19 05:06:36,734 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:06:37,651 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-19 05:06:37,651 INFO L327 TraceCheckSpWp]: Computing backward predicates...