./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/min-2-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/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_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/min-2-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/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_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/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 68785685c781649dca8a870a36ccbd5837fb99f65c0418361b1a73f7848e1bda --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:04:57,393 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:04:57,490 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:04:57,498 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:04:57,498 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:04:57,547 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:04:57,548 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:04:57,549 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:04:57,550 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:04:57,553 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:04:57,553 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:04:57,554 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:04:57,554 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:04:57,555 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:04:57,555 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:04:57,556 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:04:57,557 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:04:57,557 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:04:57,558 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:04:57,558 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:04:57,559 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:04:57,560 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:04:57,561 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:04:57,561 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:04:57,562 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:04:57,562 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:04:57,563 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:04:57,563 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:04:57,564 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:04:57,564 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:04:57,566 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:04:57,566 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:04:57,566 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:04:57,567 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:04:57,567 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:04:57,567 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:04:57,568 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:04:57,568 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:04:57,569 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:04:57,569 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:04:57,569 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:04:57,571 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:04:57,571 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:04:57,571 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:04:57,572 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:04:57,572 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_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68785685c781649dca8a870a36ccbd5837fb99f65c0418361b1a73f7848e1bda [2023-11-19 05:04:57,841 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:04:57,874 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:04:57,877 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:04:57,879 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:04:57,879 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:04:57,881 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-multidimensional/min-2-u.c [2023-11-19 05:05:01,046 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:05:01,265 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:05:01,265 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/sv-benchmarks/c/array-multidimensional/min-2-u.c [2023-11-19 05:05:01,273 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/data/a0d147189/d2f137b113414718ab055eb78537c8dc/FLAG0cefb6e55 [2023-11-19 05:05:01,288 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/data/a0d147189/d2f137b113414718ab055eb78537c8dc [2023-11-19 05:05:01,290 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:05:01,292 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:05:01,293 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:05:01,294 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:05:01,299 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:05:01,300 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,301 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3881c92c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01, skipping insertion in model container [2023-11-19 05:05:01,301 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,324 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:05:01,453 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_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2023-11-19 05:05:01,473 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:05:01,482 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:05:01,492 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2023-11-19 05:05:01,501 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:05:01,516 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:05:01,516 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01 WrapperNode [2023-11-19 05:05:01,517 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:05:01,518 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:05:01,518 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:05:01,518 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:05:01,526 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,535 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,560 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 83 [2023-11-19 05:05:01,561 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:05:01,562 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:05:01,562 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:05:01,562 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:05:01,571 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,571 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,578 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,578 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,584 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,588 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,590 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,591 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,593 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:05:01,596 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:05:01,596 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:05:01,596 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:05:01,597 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (1/1) ... [2023-11-19 05:05:01,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:05:01,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:01,630 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:05:01,654 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:05:01,681 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:05:01,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:05:01,682 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:05:01,682 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:05:01,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:05:01,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:05:01,685 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:05:01,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:05:01,778 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:05:01,781 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:05:02,076 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:05:02,132 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:05:02,133 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-19 05:05:02,137 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:05:02 BoogieIcfgContainer [2023-11-19 05:05:02,137 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:05:02,141 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:05:02,141 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:05:02,144 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:05:02,145 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:05:01" (1/3) ... [2023-11-19 05:05:02,146 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@382dde62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:05:02, skipping insertion in model container [2023-11-19 05:05:02,146 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:05:01" (2/3) ... [2023-11-19 05:05:02,146 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@382dde62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:05:02, skipping insertion in model container [2023-11-19 05:05:02,147 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:05:02" (3/3) ... [2023-11-19 05:05:02,148 INFO L112 eAbstractionObserver]: Analyzing ICFG min-2-u.c [2023-11-19 05:05:02,168 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:05:02,169 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:05:02,236 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:05:02,244 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;@1e62eb7f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:05:02,245 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:05:02,249 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:02,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:05:02,256 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:02,256 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:02,257 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:02,262 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:02,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1895355255, now seen corresponding path program 1 times [2023-11-19 05:05:02,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:02,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518996749] [2023-11-19 05:05:02,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:02,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:02,381 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:02,386 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1641482451] [2023-11-19 05:05:02,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:02,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:02,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:02,389 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:02,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:05:02,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:02,478 INFO L262 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:05:02,482 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:02,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:05:02,554 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:05:02,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:02,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518996749] [2023-11-19 05:05:02,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:02,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641482451] [2023-11-19 05:05:02,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641482451] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:02,557 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:05:02,557 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:05:02,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771471357] [2023-11-19 05:05:02,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:02,564 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:05:02,564 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:02,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:05:02,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:05:02,593 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:02,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:02,640 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2023-11-19 05:05:02,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:05:02,643 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:05:02,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:02,650 INFO L225 Difference]: With dead ends: 23 [2023-11-19 05:05:02,651 INFO L226 Difference]: Without dead ends: 13 [2023-11-19 05:05:02,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:05:02,657 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:02,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:05:02,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-19 05:05:02,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2023-11-19 05:05:02,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:02,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2023-11-19 05:05:02,695 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 7 [2023-11-19 05:05:02,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:02,696 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2023-11-19 05:05:02,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:02,697 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2023-11-19 05:05:02,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:05:02,699 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:02,699 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:02,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:02,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:02,916 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:02,916 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:02,917 INFO L85 PathProgramCache]: Analyzing trace with hash 3009601, now seen corresponding path program 1 times [2023-11-19 05:05:02,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:02,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170570497] [2023-11-19 05:05:02,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:02,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:02,932 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:02,932 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [29398734] [2023-11-19 05:05:02,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:02,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:02,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:02,934 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:02,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:05:03,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:03,004 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:05:03,006 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:03,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:05:03,031 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:05:03,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:03,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170570497] [2023-11-19 05:05:03,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:03,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29398734] [2023-11-19 05:05:03,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29398734] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:03,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:05:03,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:05:03,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667248771] [2023-11-19 05:05:03,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:03,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:05:03,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:03,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:05:03,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:05:03,036 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:03,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:03,104 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2023-11-19 05:05:03,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:05:03,104 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:05:03,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:03,106 INFO L225 Difference]: With dead ends: 31 [2023-11-19 05:05:03,106 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:05:03,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:05:03,108 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 17 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:03,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 7 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:05:03,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:05:03,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2023-11-19 05:05:03,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:03,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2023-11-19 05:05:03,119 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 9 [2023-11-19 05:05:03,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:03,120 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2023-11-19 05:05:03,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:03,120 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2023-11-19 05:05:03,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:05:03,121 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:03,121 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:03,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:03,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:03,322 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:03,323 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:03,323 INFO L85 PathProgramCache]: Analyzing trace with hash 1218994391, now seen corresponding path program 1 times [2023-11-19 05:05:03,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:03,323 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124747306] [2023-11-19 05:05:03,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:03,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:03,337 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:03,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [225187484] [2023-11-19 05:05:03,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:03,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:03,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:03,339 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:03,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:05:03,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:03,436 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:05:03,438 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:03,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:05:03,512 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:03,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:05:03,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:03,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124747306] [2023-11-19 05:05:03,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:03,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225187484] [2023-11-19 05:05:03,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225187484] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:03,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154123748] [2023-11-19 05:05:03,594 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:05:03,595 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:03,599 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:03,608 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:03,609 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:04,607 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:04,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1154123748] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:05:04,971 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:04,971 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 10 [2023-11-19 05:05:04,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309967771] [2023-11-19 05:05:04,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:05:04,973 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:05:04,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:04,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:05:04,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:05:04,976 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:05,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:05,108 INFO L93 Difference]: Finished difference Result 25 states and 32 transitions. [2023-11-19 05:05:05,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:05:05,109 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:05:05,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:05,111 INFO L225 Difference]: With dead ends: 25 [2023-11-19 05:05:05,111 INFO L226 Difference]: Without dead ends: 18 [2023-11-19 05:05:05,113 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:05:05,120 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 13 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:05,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:05:05,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-19 05:05:05,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-11-19 05:05:05,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:05,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2023-11-19 05:05:05,143 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 10 [2023-11-19 05:05:05,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:05,144 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2023-11-19 05:05:05,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:05,148 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2023-11-19 05:05:05,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:05:05,148 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:05,148 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:05,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:05,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:05,363 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:05,364 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:05,364 INFO L85 PathProgramCache]: Analyzing trace with hash 2094588570, now seen corresponding path program 1 times [2023-11-19 05:05:05,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:05,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498000081] [2023-11-19 05:05:05,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:05,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:05,375 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:05,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [544180681] [2023-11-19 05:05:05,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:05,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:05,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:05,376 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:05,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:05:05,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:05,445 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:05:05,446 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:05,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:05,482 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:05,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:05:05,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:05,512 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498000081] [2023-11-19 05:05:05,513 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:05,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544180681] [2023-11-19 05:05:05,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544180681] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:05,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190757182] [2023-11-19 05:05:05,516 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:05,516 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:05,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:05,517 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:05,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:06,358 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:06,635 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '405#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:06,635 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:06,635 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:06,635 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2023-11-19 05:05:06,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032448917] [2023-11-19 05:05:06,636 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:06,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:05:06,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:06,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:05:06,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2023-11-19 05:05:06,638 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:06,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:06,782 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2023-11-19 05:05:06,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:05:06,783 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:05:06,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:06,787 INFO L225 Difference]: With dead ends: 52 [2023-11-19 05:05:06,788 INFO L226 Difference]: Without dead ends: 38 [2023-11-19 05:05:06,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-11-19 05:05:06,793 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 66 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:06,794 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 13 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:05:06,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-19 05:05:06,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2023-11-19 05:05:06,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:06,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2023-11-19 05:05:06,816 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 13 [2023-11-19 05:05:06,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:06,816 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2023-11-19 05:05:06,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:06,817 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2023-11-19 05:05:06,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-19 05:05:06,822 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:06,822 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:06,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:07,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:07,035 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:07,035 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:07,035 INFO L85 PathProgramCache]: Analyzing trace with hash -535283115, now seen corresponding path program 2 times [2023-11-19 05:05:07,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:07,036 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806499081] [2023-11-19 05:05:07,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:07,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:07,055 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:07,056 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1867075892] [2023-11-19 05:05:07,056 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:05:07,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:07,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:07,059 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:07,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:05:07,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:05:07,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:05:07,140 INFO L262 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:05:07,142 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:07,189 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:05:07,189 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:07,220 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:05:07,220 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:07,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806499081] [2023-11-19 05:05:07,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:07,220 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1867075892] [2023-11-19 05:05:07,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1867075892] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:07,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2097909015] [2023-11-19 05:05:07,227 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:07,227 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:07,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:07,228 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:07,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:08,093 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:08,485 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '665#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:08,485 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:08,486 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:08,486 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 5 [2023-11-19 05:05:08,486 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955215959] [2023-11-19 05:05:08,486 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:08,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:05:08,487 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:08,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:05:08,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:05:08,488 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:08,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:08,571 INFO L93 Difference]: Finished difference Result 72 states and 92 transitions. [2023-11-19 05:05:08,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:05:08,572 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-19 05:05:08,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:08,576 INFO L225 Difference]: With dead ends: 72 [2023-11-19 05:05:08,576 INFO L226 Difference]: Without dead ends: 49 [2023-11-19 05:05:08,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:05:08,578 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:08,579 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:05:08,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-19 05:05:08,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2023-11-19 05:05:08,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:08,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2023-11-19 05:05:08,607 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 19 [2023-11-19 05:05:08,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:08,608 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2023-11-19 05:05:08,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:08,608 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2023-11-19 05:05:08,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 05:05:08,610 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:08,610 INFO L195 NwaCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:08,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:08,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:08,832 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:08,832 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:08,832 INFO L85 PathProgramCache]: Analyzing trace with hash -1457403469, now seen corresponding path program 3 times [2023-11-19 05:05:08,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:08,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20236634] [2023-11-19 05:05:08,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:08,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:08,855 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:08,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1891773054] [2023-11-19 05:05:08,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:05:08,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:08,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:08,856 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:08,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:05:08,952 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:05:08,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:05:08,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:05:08,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2023-11-19 05:05:09,039 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:09,135 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2023-11-19 05:05:09,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:09,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20236634] [2023-11-19 05:05:09,135 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:09,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891773054] [2023-11-19 05:05:09,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891773054] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:09,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [887002591] [2023-11-19 05:05:09,141 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:09,141 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:09,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:09,142 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:09,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:09,914 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:10,337 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1115#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:10,338 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:10,338 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:10,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2023-11-19 05:05:10,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549870473] [2023-11-19 05:05:10,338 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:10,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 05:05:10,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:10,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 05:05:10,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=420, Unknown=0, NotChecked=0, Total=552 [2023-11-19 05:05:10,341 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:10,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:10,988 INFO L93 Difference]: Finished difference Result 154 states and 181 transitions. [2023-11-19 05:05:10,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-19 05:05:10,989 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2023-11-19 05:05:10,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:10,994 INFO L225 Difference]: With dead ends: 154 [2023-11-19 05:05:10,995 INFO L226 Difference]: Without dead ends: 138 [2023-11-19 05:05:10,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=409, Invalid=1231, Unknown=0, NotChecked=0, Total=1640 [2023-11-19 05:05:10,997 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 123 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 299 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:10,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 100 Invalid, 299 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:05:11,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2023-11-19 05:05:11,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 67. [2023-11-19 05:05:11,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2272727272727273) internal successors, (81), 66 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:11,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2023-11-19 05:05:11,046 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 37 [2023-11-19 05:05:11,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:11,047 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2023-11-19 05:05:11,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:11,047 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2023-11-19 05:05:11,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-11-19 05:05:11,053 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:11,053 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:11,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:11,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:11,267 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:11,267 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:11,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1873871377, now seen corresponding path program 4 times [2023-11-19 05:05:11,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:11,268 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518964040] [2023-11-19 05:05:11,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:11,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:11,290 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:11,290 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [841429971] [2023-11-19 05:05:11,290 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:05:11,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:11,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:11,292 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:11,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:05:11,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:11,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:05:11,427 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:11,484 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2023-11-19 05:05:11,484 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:11,551 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2023-11-19 05:05:11,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:11,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518964040] [2023-11-19 05:05:11,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:11,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841429971] [2023-11-19 05:05:11,552 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841429971] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:11,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [505376951] [2023-11-19 05:05:11,555 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:11,555 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:11,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:11,556 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:11,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:12,209 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:12,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1868#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:12,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:12,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:12,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2023-11-19 05:05:12,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378293625] [2023-11-19 05:05:12,438 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:12,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:05:12,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:12,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:05:12,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:05:12,440 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:12,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:12,704 INFO L93 Difference]: Finished difference Result 212 states and 290 transitions. [2023-11-19 05:05:12,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:05:12,705 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2023-11-19 05:05:12,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:12,706 INFO L225 Difference]: With dead ends: 212 [2023-11-19 05:05:12,706 INFO L226 Difference]: Without dead ends: 152 [2023-11-19 05:05:12,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=191, Invalid=511, Unknown=0, NotChecked=0, Total=702 [2023-11-19 05:05:12,708 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 144 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:12,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 31 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:05:12,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-11-19 05:05:12,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 133. [2023-11-19 05:05:12,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.1590909090909092) internal successors, (153), 132 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:12,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 153 transitions. [2023-11-19 05:05:12,745 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 153 transitions. Word has length 55 [2023-11-19 05:05:12,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:12,746 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 153 transitions. [2023-11-19 05:05:12,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:12,746 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 153 transitions. [2023-11-19 05:05:12,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-19 05:05:12,752 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:12,752 INFO L195 NwaCegarLoop]: trace histogram [40, 40, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:12,777 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:12,974 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:12,974 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:12,975 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:12,975 INFO L85 PathProgramCache]: Analyzing trace with hash 912324207, now seen corresponding path program 5 times [2023-11-19 05:05:12,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:12,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197603412] [2023-11-19 05:05:12,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:12,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:13,013 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:13,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [478411502] [2023-11-19 05:05:13,014 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:05:13,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:13,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:13,015 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:13,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:05:15,119 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-11-19 05:05:15,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:05:15,125 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-19 05:05:15,132 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:15,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2023-11-19 05:05:15,403 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:15,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 4 proven. 418 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2023-11-19 05:05:15,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:15,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197603412] [2023-11-19 05:05:15,711 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:15,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478411502] [2023-11-19 05:05:15,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478411502] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:15,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [498160524] [2023-11-19 05:05:15,717 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:15,717 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:15,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:15,718 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:15,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:16,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:16,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3140#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:16,801 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:16,801 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:16,801 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2023-11-19 05:05:16,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888053511] [2023-11-19 05:05:16,801 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:16,802 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-19 05:05:16,802 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:16,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-19 05:05:16,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=781, Unknown=0, NotChecked=0, Total=1122 [2023-11-19 05:05:16,803 INFO L87 Difference]: Start difference. First operand 133 states and 153 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:17,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:17,409 INFO L93 Difference]: Finished difference Result 428 states and 566 transitions. [2023-11-19 05:05:17,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-11-19 05:05:17,410 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2023-11-19 05:05:17,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:17,411 INFO L225 Difference]: With dead ends: 428 [2023-11-19 05:05:17,412 INFO L226 Difference]: Without dead ends: 308 [2023-11-19 05:05:17,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=627, Invalid=1353, Unknown=0, NotChecked=0, Total=1980 [2023-11-19 05:05:17,414 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 440 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 188 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 188 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:17,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [440 Valid, 67 Invalid, 296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [188 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:05:17,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2023-11-19 05:05:17,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 265. [2023-11-19 05:05:17,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.125) internal successors, (297), 264 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:17,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 297 transitions. [2023-11-19 05:05:17,473 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 297 transitions. Word has length 103 [2023-11-19 05:05:17,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:17,473 INFO L495 AbstractCegarLoop]: Abstraction has 265 states and 297 transitions. [2023-11-19 05:05:17,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:17,474 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 297 transitions. [2023-11-19 05:05:17,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2023-11-19 05:05:17,476 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:17,476 INFO L195 NwaCegarLoop]: trace histogram [88, 88, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:17,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:17,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:17,687 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:17,687 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:17,687 INFO L85 PathProgramCache]: Analyzing trace with hash -1637734545, now seen corresponding path program 6 times [2023-11-19 05:05:17,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:17,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197675139] [2023-11-19 05:05:17,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:17,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:17,779 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:17,779 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1390185283] [2023-11-19 05:05:17,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:05:17,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:17,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:17,783 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:17,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:05:18,077 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:05:18,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:05:18,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-19 05:05:18,092 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:18,840 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2023-11-19 05:05:18,840 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:19,507 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2023-11-19 05:05:19,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:19,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197675139] [2023-11-19 05:05:19,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:19,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1390185283] [2023-11-19 05:05:19,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1390185283] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:19,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1684095999] [2023-11-19 05:05:19,511 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:19,511 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:19,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:19,511 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:19,512 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:20,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:20,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5644#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:20,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:20,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:20,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 58 [2023-11-19 05:05:20,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159927641] [2023-11-19 05:05:20,569 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:20,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2023-11-19 05:05:20,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:20,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2023-11-19 05:05:20,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=2999, Unknown=0, NotChecked=0, Total=4290 [2023-11-19 05:05:20,575 INFO L87 Difference]: Start difference. First operand 265 states and 297 transitions. Second operand has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:24,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:24,884 INFO L93 Difference]: Finished difference Result 1437 states and 1647 transitions. [2023-11-19 05:05:24,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2023-11-19 05:05:24,884 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2023-11-19 05:05:24,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:24,894 INFO L225 Difference]: With dead ends: 1437 [2023-11-19 05:05:24,894 INFO L226 Difference]: Without dead ends: 1367 [2023-11-19 05:05:24,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 777 GetRequests, 609 SyntacticMatches, 0 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11212 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=8523, Invalid=20207, Unknown=0, NotChecked=0, Total=28730 [2023-11-19 05:05:24,908 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 650 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 523 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 650 SdHoareTripleChecker+Valid, 646 SdHoareTripleChecker+Invalid, 1501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 523 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:24,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [650 Valid, 646 Invalid, 1501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [523 Valid, 978 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2023-11-19 05:05:24,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1367 states. [2023-11-19 05:05:24,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1367 to 409. [2023-11-19 05:05:24,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 1.0955882352941178) internal successors, (447), 408 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:25,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 447 transitions. [2023-11-19 05:05:25,000 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 447 transitions. Word has length 199 [2023-11-19 05:05:25,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:25,001 INFO L495 AbstractCegarLoop]: Abstraction has 409 states and 447 transitions. [2023-11-19 05:05:25,001 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:25,002 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 447 transitions. [2023-11-19 05:05:25,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2023-11-19 05:05:25,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:25,007 INFO L195 NwaCegarLoop]: trace histogram [220, 88, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:25,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:25,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:25,229 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:25,229 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:25,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1688486183, now seen corresponding path program 7 times [2023-11-19 05:05:25,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:25,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427435880] [2023-11-19 05:05:25,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:25,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:25,317 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:25,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [952739323] [2023-11-19 05:05:25,317 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:05:25,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:25,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:25,319 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:25,330 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:05:25,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:05:25,967 INFO L262 TraceCheckSpWp]: Trace formula consists of 1822 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-19 05:05:25,980 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:05:26,450 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2023-11-19 05:05:26,450 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:05:27,117 INFO L134 CoverageAnalysis]: Checked inductivity of 30586 backedges. 1591 proven. 253 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2023-11-19 05:05:27,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:05:27,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427435880] [2023-11-19 05:05:27,118 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:05:27,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952739323] [2023-11-19 05:05:27,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952739323] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:05:27,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1654383136] [2023-11-19 05:05:27,120 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 05:05:27,121 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:05:27,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:05:27,121 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:05:27,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:05:27,759 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:05:28,144 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11042#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~n~0#1|) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) |ULTIMATE.start_main_~min~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)))' at error location [2023-11-19 05:05:28,144 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:05:28,145 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:05:28,145 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 49 [2023-11-19 05:05:28,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136747369] [2023-11-19 05:05:28,146 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:05:28,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-11-19 05:05:28,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:05:28,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-11-19 05:05:28,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1217, Invalid=2089, Unknown=0, NotChecked=0, Total=3306 [2023-11-19 05:05:28,151 INFO L87 Difference]: Start difference. First operand 409 states and 447 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:29,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:05:29,906 INFO L93 Difference]: Finished difference Result 1292 states and 1706 transitions. [2023-11-19 05:05:29,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2023-11-19 05:05:29,906 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 343 [2023-11-19 05:05:29,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:05:29,911 INFO L225 Difference]: With dead ends: 1292 [2023-11-19 05:05:29,911 INFO L226 Difference]: Without dead ends: 908 [2023-11-19 05:05:29,915 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 971 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=2367, Invalid=4113, Unknown=0, NotChecked=0, Total=6480 [2023-11-19 05:05:29,916 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 946 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 342 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 946 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 342 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:05:29,916 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [946 Valid, 139 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [342 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:05:29,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2023-11-19 05:05:30,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 817. [2023-11-19 05:05:30,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 817 states, 816 states have (on average 1.0772058823529411) internal successors, (879), 816 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:30,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 817 states to 817 states and 879 transitions. [2023-11-19 05:05:30,114 INFO L78 Accepts]: Start accepts. Automaton has 817 states and 879 transitions. Word has length 343 [2023-11-19 05:05:30,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:05:30,114 INFO L495 AbstractCegarLoop]: Abstraction has 817 states and 879 transitions. [2023-11-19 05:05:30,114 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:05:30,115 INFO L276 IsEmpty]: Start isEmpty. Operand 817 states and 879 transitions. [2023-11-19 05:05:30,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 680 [2023-11-19 05:05:30,132 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:05:30,133 INFO L195 NwaCegarLoop]: trace histogram [460, 184, 10, 10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:05:30,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:05:30,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:30,347 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:05:30,347 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:05:30,347 INFO L85 PathProgramCache]: Analyzing trace with hash 370398759, now seen corresponding path program 8 times [2023-11-19 05:05:30,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:05:30,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677466215] [2023-11-19 05:05:30,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:05:30,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:05:30,535 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:05:30,535 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [737357146] [2023-11-19 05:05:30,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:05:30,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:05:30,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:05:30,536 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:05:30,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4fdc33b3-09f5-409d-9d7c-8a4b688ed389/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process