./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 527bcce2 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_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Overflow-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45898d4df949634911027a72c0e1c79e1edaab63547cca5c16238cef1218e556 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:51:19,105 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:51:19,185 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Overflow-32bit-Taipan_Default.epf [2023-11-21 19:51:19,192 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:51:19,192 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:51:19,220 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:51:19,221 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:51:19,222 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:51:19,222 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:51:19,223 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:51:19,224 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:51:19,224 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:51:19,225 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:51:19,225 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:51:19,226 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:51:19,226 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:51:19,227 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:51:19,228 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:51:19,228 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:51:19,229 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:51:19,229 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:51:19,230 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:51:19,231 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:51:19,231 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:51:19,232 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:51:19,232 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:51:19,233 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:51:19,233 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:51:19,234 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:51:19,234 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:51:19,239 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:51:19,239 INFO L153 SettingsManager]: * Check absence of signed integer overflows=true [2023-11-21 19:51:19,240 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 19:51:19,240 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:51:19,240 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:51:19,241 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:51:19,241 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:51:19,241 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:51:19,241 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:51:19,242 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:19,242 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:51:19,242 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:51:19,243 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:51:19,243 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:51:19,243 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:51:19,243 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:51:19,244 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:51:19,244 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:51:19,244 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:51:19,244 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_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45898d4df949634911027a72c0e1c79e1edaab63547cca5c16238cef1218e556 [2023-11-21 19:51:19,488 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:51:19,511 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:51:19,514 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:51:19,515 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:51:19,516 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:51:19,517 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/recursified_loop-simple/recursified_nested_4.c [2023-11-21 19:51:22,883 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:51:23,106 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:51:23,106 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/sv-benchmarks/c/recursified_loop-simple/recursified_nested_4.c [2023-11-21 19:51:23,115 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/data/5b59ffb8f/9d65ddae473b4f6699c62a046be1c505/FLAGc25cddec8 [2023-11-21 19:51:23,134 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/data/5b59ffb8f/9d65ddae473b4f6699c62a046be1c505 [2023-11-21 19:51:23,137 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:51:23,139 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:51:23,141 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:23,141 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:51:23,147 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:51:23,148 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,150 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d4de4ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23, skipping insertion in model container [2023-11-21 19:51:23,150 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,177 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:51:23,342 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:23,353 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:51:23,376 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:23,392 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:51:23,392 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23 WrapperNode [2023-11-21 19:51:23,392 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:23,394 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:23,394 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:51:23,394 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:51:23,402 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,411 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,432 INFO L138 Inliner]: procedures = 15, calls = 52, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 67 [2023-11-21 19:51:23,433 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:23,433 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:51:23,434 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:51:23,434 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:51:23,444 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,444 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,447 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,447 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,454 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,457 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,459 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,460 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,463 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:51:23,464 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:51:23,465 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:51:23,465 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:51:23,466 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (1/1) ... [2023-11-21 19:51:23,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:23,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:23,497 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:51:23,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:51:23,544 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:51:23,544 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:51:23,544 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 19:51:23,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:51:23,545 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_24_to_25_0 [2023-11-21 19:51:23,547 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_24_to_25_0 [2023-11-21 19:51:23,548 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_23_to_24_0 [2023-11-21 19:51:23,548 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_23_to_24_0 [2023-11-21 19:51:23,548 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_22_to_23_0 [2023-11-21 19:51:23,548 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_22_to_23_0 [2023-11-21 19:51:23,548 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_25_to_25_0 [2023-11-21 19:51:23,548 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_25_to_25_0 [2023-11-21 19:51:23,548 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:51:23,549 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:51:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:51:23,549 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:51:23,628 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:51:23,630 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:51:23,894 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:51:23,991 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:51:23,991 INFO L308 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-21 19:51:23,993 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:23 BoogieIcfgContainer [2023-11-21 19:51:23,993 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:51:23,996 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:51:23,997 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:51:24,000 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:51:24,001 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:51:23" (1/3) ... [2023-11-21 19:51:24,001 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@545d68c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:24, skipping insertion in model container [2023-11-21 19:51:24,002 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:23" (2/3) ... [2023-11-21 19:51:24,002 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@545d68c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:24, skipping insertion in model container [2023-11-21 19:51:24,002 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:23" (3/3) ... [2023-11-21 19:51:24,004 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_nested_4.c [2023-11-21 19:51:24,023 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:51:24,023 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 8 error locations. [2023-11-21 19:51:24,077 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:51:24,084 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;@33115e86, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:51:24,084 INFO L358 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2023-11-21 19:51:24,088 INFO L276 IsEmpty]: Start isEmpty. Operand has 46 states, 25 states have (on average 1.48) internal successors, (37), 37 states have internal predecessors, (37), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 19:51:24,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-21 19:51:24,095 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:24,096 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:24,096 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting func_to_recursive_line_22_to_23_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:24,102 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:24,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1456900990, now seen corresponding path program 1 times [2023-11-21 19:51:24,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:24,111 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236742907] [2023-11-21 19:51:24,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:24,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:24,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:24,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:24,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:24,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236742907] [2023-11-21 19:51:24,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236742907] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:24,824 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:24,824 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:51:24,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499363761] [2023-11-21 19:51:24,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:24,833 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:24,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:24,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:24,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:51:24,894 INFO L87 Difference]: Start difference. First operand has 46 states, 25 states have (on average 1.48) internal successors, (37), 37 states have internal predecessors, (37), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:51:25,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:25,175 INFO L93 Difference]: Finished difference Result 98 states and 117 transitions. [2023-11-21 19:51:25,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:51:25,179 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-21 19:51:25,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:25,190 INFO L225 Difference]: With dead ends: 98 [2023-11-21 19:51:25,191 INFO L226 Difference]: Without dead ends: 48 [2023-11-21 19:51:25,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:51:25,200 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 14 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:25,202 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 109 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:51:25,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-21 19:51:25,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44. [2023-11-21 19:51:25,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 35 states have internal predecessors, (35), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-11-21 19:51:25,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2023-11-21 19:51:25,257 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 11 [2023-11-21 19:51:25,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:25,258 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2023-11-21 19:51:25,258 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.6) internal successors, (8), 5 states have internal predecessors, (8), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:51:25,259 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2023-11-21 19:51:25,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:51:25,261 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:25,261 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:25,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:51:25,262 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting func_to_recursive_line_25_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:25,263 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:25,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1916990516, now seen corresponding path program 1 times [2023-11-21 19:51:25,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:25,264 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122006691] [2023-11-21 19:51:25,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:25,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:25,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:25,503 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:25,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:25,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122006691] [2023-11-21 19:51:25,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122006691] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:25,505 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:25,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:51:25,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188465337] [2023-11-21 19:51:25,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:25,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:25,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:25,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:25,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:51:25,509 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 6 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:25,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:25,636 INFO L93 Difference]: Finished difference Result 91 states and 110 transitions. [2023-11-21 19:51:25,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:51:25,637 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-21 19:51:25,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:25,639 INFO L225 Difference]: With dead ends: 91 [2023-11-21 19:51:25,639 INFO L226 Difference]: Without dead ends: 49 [2023-11-21 19:51:25,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:51:25,643 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:25,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 169 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:25,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2023-11-21 19:51:25,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2023-11-21 19:51:25,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 37 states have internal predecessors, (38), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-11-21 19:51:25,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2023-11-21 19:51:25,657 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 14 [2023-11-21 19:51:25,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:25,657 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2023-11-21 19:51:25,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.5) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:25,658 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2023-11-21 19:51:25,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:51:25,659 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:25,659 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:25,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:51:25,660 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting func_to_recursive_line_25_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:25,661 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:25,661 INFO L85 PathProgramCache]: Analyzing trace with hash 702836230, now seen corresponding path program 1 times [2023-11-21 19:51:25,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:25,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454526311] [2023-11-21 19:51:25,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:25,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:25,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:25,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:25,779 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:25,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454526311] [2023-11-21 19:51:25,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454526311] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:25,780 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:25,780 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:51:25,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117499381] [2023-11-21 19:51:25,781 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:25,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:51:25,782 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:25,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:51:25,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:51:25,783 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:25,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:25,832 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2023-11-21 19:51:25,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:51:25,833 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-21 19:51:25,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:25,834 INFO L225 Difference]: With dead ends: 47 [2023-11-21 19:51:25,834 INFO L226 Difference]: Without dead ends: 46 [2023-11-21 19:51:25,835 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:51:25,837 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 1 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:25,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 110 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:51:25,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-21 19:51:25,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-21 19:51:25,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 36 states have internal predecessors, (37), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-11-21 19:51:25,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2023-11-21 19:51:25,849 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 15 [2023-11-21 19:51:25,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:25,849 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2023-11-21 19:51:25,849 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (4), 1 states have call predecessors, (4), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:25,850 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2023-11-21 19:51:25,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:51:25,851 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:25,851 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:25,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:51:25,852 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting func_to_recursive_line_23_to_24_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:25,852 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:25,853 INFO L85 PathProgramCache]: Analyzing trace with hash -1911039939, now seen corresponding path program 1 times [2023-11-21 19:51:25,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:25,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780790237] [2023-11-21 19:51:25,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:25,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:25,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:26,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:26,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:26,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780790237] [2023-11-21 19:51:26,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780790237] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:26,032 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:26,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:51:26,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505251708] [2023-11-21 19:51:26,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:26,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:26,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:26,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:26,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:51:26,035 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:51:26,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:26,211 INFO L93 Difference]: Finished difference Result 94 states and 109 transitions. [2023-11-21 19:51:26,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:51:26,212 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-21 19:51:26,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:26,214 INFO L225 Difference]: With dead ends: 94 [2023-11-21 19:51:26,215 INFO L226 Difference]: Without dead ends: 50 [2023-11-21 19:51:26,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:51:26,230 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 11 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:26,231 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 100 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:26,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-21 19:51:26,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-21 19:51:26,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 38 states have internal predecessors, (39), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-21 19:51:26,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2023-11-21 19:51:26,246 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 14 [2023-11-21 19:51:26,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:26,246 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2023-11-21 19:51:26,247 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:51:26,247 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2023-11-21 19:51:26,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:51:26,249 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:26,249 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:26,249 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:51:26,250 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting func_to_recursive_line_25_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:26,250 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:26,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1500420822, now seen corresponding path program 1 times [2023-11-21 19:51:26,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:26,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1526831064] [2023-11-21 19:51:26,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:26,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:26,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:26,585 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:26,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:26,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1526831064] [2023-11-21 19:51:26,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1526831064] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:26,586 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:26,586 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:51:26,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330098351] [2023-11-21 19:51:26,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:26,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:51:26,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:26,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:51:26,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:51:26,592 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand has 7 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:26,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:26,744 INFO L93 Difference]: Finished difference Result 54 states and 64 transitions. [2023-11-21 19:51:26,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:51:26,744 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:51:26,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:26,746 INFO L225 Difference]: With dead ends: 54 [2023-11-21 19:51:26,746 INFO L226 Difference]: Without dead ends: 53 [2023-11-21 19:51:26,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:51:26,748 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 11 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:26,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 135 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:26,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-21 19:51:26,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 48. [2023-11-21 19:51:26,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 36 states have internal predecessors, (37), 8 states have call successors, (8), 5 states have call predecessors, (8), 6 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2023-11-21 19:51:26,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2023-11-21 19:51:26,759 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 19 [2023-11-21 19:51:26,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:26,759 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2023-11-21 19:51:26,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.8) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:26,760 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2023-11-21 19:51:26,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-21 19:51:26,761 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:26,761 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:26,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:51:26,762 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:26,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:26,762 INFO L85 PathProgramCache]: Analyzing trace with hash -214899351, now seen corresponding path program 1 times [2023-11-21 19:51:26,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:26,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491513027] [2023-11-21 19:51:26,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:26,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:26,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:27,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:27,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:27,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491513027] [2023-11-21 19:51:27,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491513027] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:27,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818092027] [2023-11-21 19:51:27,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:27,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:27,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:27,287 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:27,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:51:27,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:27,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-21 19:51:27,427 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:27,505 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:51:27,819 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:27,820 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:28,426 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:28,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818092027] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:28,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1155169582] [2023-11-21 19:51:28,452 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-21 19:51:28,452 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:28,457 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:51:28,459 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:28,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 11] total 24 [2023-11-21 19:51:28,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818948981] [2023-11-21 19:51:28,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:28,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-21 19:51:28,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:28,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-21 19:51:28,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2023-11-21 19:51:28,463 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 24 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 19:51:29,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:29,005 INFO L93 Difference]: Finished difference Result 98 states and 116 transitions. [2023-11-21 19:51:29,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:51:29,006 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 24 [2023-11-21 19:51:29,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:29,009 INFO L225 Difference]: With dead ends: 98 [2023-11-21 19:51:29,010 INFO L226 Difference]: Without dead ends: 52 [2023-11-21 19:51:29,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=181, Invalid=689, Unknown=0, NotChecked=0, Total=870 [2023-11-21 19:51:29,014 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 14 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:29,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 252 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:51:29,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-21 19:51:29,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-21 19:51:29,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 30 states have (on average 1.3) internal successors, (39), 38 states have internal predecessors, (39), 8 states have call successors, (8), 5 states have call predecessors, (8), 8 states have return successors, (11), 8 states have call predecessors, (11), 6 states have call successors, (11) [2023-11-21 19:51:29,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2023-11-21 19:51:29,038 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 24 [2023-11-21 19:51:29,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:29,039 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2023-11-21 19:51:29,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 19 states have (on average 1.736842105263158) internal successors, (33), 21 states have internal predecessors, (33), 6 states have call successors, (8), 4 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-21 19:51:29,039 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2023-11-21 19:51:29,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-21 19:51:29,041 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:29,041 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:29,072 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-21 19:51:29,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:29,266 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:29,267 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:29,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1899158159, now seen corresponding path program 2 times [2023-11-21 19:51:29,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:29,267 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76681739] [2023-11-21 19:51:29,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:29,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:29,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:30,267 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:51:30,269 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:30,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76681739] [2023-11-21 19:51:30,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76681739] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:30,269 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885789922] [2023-11-21 19:51:30,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:51:30,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:30,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:30,271 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:30,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:51:30,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-21 19:51:30,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:51:30,436 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-21 19:51:30,446 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:30,460 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 454 treesize of output 442 [2023-11-21 19:51:30,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:51:30,702 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:51:30,917 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:51:30,966 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-21 19:51:30,966 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:31,146 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_178 (Array Int Int))) (< 0 (+ 2147483650 (select (select (store |c_#memory_int| c_func_to_recursive_line_24_to_25_0_~d.base v_ArrVal_178) c_func_to_recursive_line_24_to_25_0_~c.base) c_func_to_recursive_line_24_to_25_0_~c.offset)))) is different from false [2023-11-21 19:51:31,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885789922] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:31,150 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [120567268] [2023-11-21 19:51:31,154 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-21 19:51:31,154 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:31,155 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:51:31,158 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:51:31,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 28 [2023-11-21 19:51:31,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691058727] [2023-11-21 19:51:31,159 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:31,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-21 19:51:31,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:31,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-21 19:51:31,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=777, Unknown=1, NotChecked=56, Total=930 [2023-11-21 19:51:31,162 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 28 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 24 states have internal predecessors, (41), 10 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-11-21 19:51:31,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:31,994 INFO L93 Difference]: Finished difference Result 113 states and 133 transitions. [2023-11-21 19:51:31,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-21 19:51:31,995 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 24 states have internal predecessors, (41), 10 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) Word has length 38 [2023-11-21 19:51:31,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:31,996 INFO L225 Difference]: With dead ends: 113 [2023-11-21 19:51:31,997 INFO L226 Difference]: Without dead ends: 61 [2023-11-21 19:51:31,998 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=215, Invalid=1858, Unknown=1, NotChecked=88, Total=2162 [2023-11-21 19:51:31,999 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 74 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:32,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 337 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:51:32,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-21 19:51:32,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2023-11-21 19:51:32,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 42 states have internal predecessors, (44), 9 states have call successors, (9), 6 states have call predecessors, (9), 9 states have return successors, (13), 10 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-21 19:51:32,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2023-11-21 19:51:32,018 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 38 [2023-11-21 19:51:32,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:32,019 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2023-11-21 19:51:32,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 24 states have internal predecessors, (41), 10 states have call successors, (12), 5 states have call predecessors, (12), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2023-11-21 19:51:32,019 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2023-11-21 19:51:32,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-21 19:51:32,028 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:32,028 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:32,056 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:32,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:32,252 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:32,252 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:32,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1063554471, now seen corresponding path program 1 times [2023-11-21 19:51:32,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:32,252 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315815772] [2023-11-21 19:51:32,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:32,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:32,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:33,383 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 12 proven. 24 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-21 19:51:33,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:33,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315815772] [2023-11-21 19:51:33,384 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315815772] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:33,384 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903602031] [2023-11-21 19:51:33,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:33,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:33,385 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:33,386 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:33,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:51:33,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:33,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 63 conjunts are in the unsatisfiable core [2023-11-21 19:51:33,532 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:33,538 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 130 treesize of output 126 [2023-11-21 19:51:33,712 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:51:33,992 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:51:34,027 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-11-21 19:51:34,058 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2023-11-21 19:51:34,058 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:34,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903602031] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:34,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1701314377] [2023-11-21 19:51:34,389 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-21 19:51:34,389 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:34,389 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:51:34,390 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:51:34,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 29 [2023-11-21 19:51:34,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796658319] [2023-11-21 19:51:34,390 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:34,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-21 19:51:34,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:34,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-21 19:51:34,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=880, Unknown=10, NotChecked=0, Total=992 [2023-11-21 19:51:34,395 INFO L87 Difference]: Start difference. First operand 59 states and 66 transitions. Second operand has 29 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 25 states have internal predecessors, (44), 10 states have call successors, (12), 5 states have call predecessors, (12), 7 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-21 19:51:35,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:35,444 INFO L93 Difference]: Finished difference Result 122 states and 145 transitions. [2023-11-21 19:51:35,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2023-11-21 19:51:35,445 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 25 states have internal predecessors, (44), 10 states have call successors, (12), 5 states have call predecessors, (12), 7 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 46 [2023-11-21 19:51:35,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:35,447 INFO L225 Difference]: With dead ends: 122 [2023-11-21 19:51:35,447 INFO L226 Difference]: Without dead ends: 65 [2023-11-21 19:51:35,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=239, Invalid=2103, Unknown=10, NotChecked=0, Total=2352 [2023-11-21 19:51:35,450 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 65 mSDsluCounter, 331 mSDsCounter, 0 mSdLazyCounter, 529 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 529 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:35,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 358 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 529 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:51:35,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-21 19:51:35,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2023-11-21 19:51:35,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 45 states have internal predecessors, (46), 10 states have call successors, (10), 6 states have call predecessors, (10), 10 states have return successors, (14), 12 states have call predecessors, (14), 8 states have call successors, (14) [2023-11-21 19:51:35,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2023-11-21 19:51:35,471 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 46 [2023-11-21 19:51:35,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:35,472 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2023-11-21 19:51:35,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 25 states have internal predecessors, (44), 10 states have call successors, (12), 5 states have call predecessors, (12), 7 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-21 19:51:35,473 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2023-11-21 19:51:35,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-21 19:51:35,477 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:35,478 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:35,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:35,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-21 19:51:35,708 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting func_to_recursive_line_23_to_24_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:35,708 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:35,708 INFO L85 PathProgramCache]: Analyzing trace with hash 534679781, now seen corresponding path program 1 times [2023-11-21 19:51:35,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:35,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163635271] [2023-11-21 19:51:35,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:35,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:35,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:37,433 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 18 proven. 35 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2023-11-21 19:51:37,433 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:37,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163635271] [2023-11-21 19:51:37,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163635271] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:37,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978120887] [2023-11-21 19:51:37,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:37,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:37,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:37,436 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:37,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:51:37,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:37,597 INFO L262 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 79 conjunts are in the unsatisfiable core [2023-11-21 19:51:37,609 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:37,617 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:51:38,393 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 2 proven. 35 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-21 19:51:38,394 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:43,279 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 2 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:51:43,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978120887] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:43,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [443673338] [2023-11-21 19:51:43,283 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-11-21 19:51:43,283 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:43,287 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:51:43,289 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:43,289 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 31] total 50 [2023-11-21 19:51:43,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512405160] [2023-11-21 19:51:43,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:43,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-11-21 19:51:43,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:43,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-11-21 19:51:43,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=455, Invalid=1995, Unknown=0, NotChecked=0, Total=2450 [2023-11-21 19:51:43,296 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 50 states, 40 states have (on average 1.7) internal successors, (68), 43 states have internal predecessors, (68), 12 states have call successors, (15), 9 states have call predecessors, (15), 15 states have return successors, (21), 12 states have call predecessors, (21), 12 states have call successors, (21) [2023-11-21 19:51:44,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:44,382 INFO L93 Difference]: Finished difference Result 128 states and 150 transitions. [2023-11-21 19:51:44,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:51:44,383 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 40 states have (on average 1.7) internal successors, (68), 43 states have internal predecessors, (68), 12 states have call successors, (15), 9 states have call predecessors, (15), 15 states have return successors, (21), 12 states have call predecessors, (21), 12 states have call successors, (21) Word has length 62 [2023-11-21 19:51:44,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:44,385 INFO L225 Difference]: With dead ends: 128 [2023-11-21 19:51:44,385 INFO L226 Difference]: Without dead ends: 67 [2023-11-21 19:51:44,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 101 SyntacticMatches, 4 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=653, Invalid=2653, Unknown=0, NotChecked=0, Total=3306 [2023-11-21 19:51:44,388 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 62 mSDsluCounter, 394 mSDsCounter, 0 mSdLazyCounter, 569 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:44,389 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 427 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 569 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 19:51:44,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-11-21 19:51:44,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2023-11-21 19:51:44,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 38 states have (on average 1.236842105263158) internal successors, (47), 46 states have internal predecessors, (47), 10 states have call successors, (10), 6 states have call predecessors, (10), 11 states have return successors, (15), 13 states have call predecessors, (15), 8 states have call successors, (15) [2023-11-21 19:51:44,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2023-11-21 19:51:44,398 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 62 [2023-11-21 19:51:44,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:44,399 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2023-11-21 19:51:44,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 40 states have (on average 1.7) internal successors, (68), 43 states have internal predecessors, (68), 12 states have call successors, (15), 9 states have call predecessors, (15), 15 states have return successors, (21), 12 states have call predecessors, (21), 12 states have call successors, (21) [2023-11-21 19:51:44,399 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2023-11-21 19:51:44,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-11-21 19:51:44,401 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:44,401 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:44,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:44,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20807c96-fbba-436f-80a4-5da07bd29283/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:44,623 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting func_to_recursive_line_23_to_24_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW === [func_to_recursive_line_24_to_25_0Err0ASSERT_VIOLATIONINTEGER_OVERFLOW, func_to_recursive_line_24_to_25_0Err1ASSERT_VIOLATIONINTEGER_OVERFLOW (and 6 more)] === [2023-11-21 19:51:44,623 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:44,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1912369558, now seen corresponding path program 2 times [2023-11-21 19:51:44,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:44,624 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1542531063] [2023-11-21 19:51:44,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:44,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:44,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat