./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/xor4.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/xor4.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 90b7e6947bda838aad0c5e01877b9a712c46c1a2dc1a2af9f1fb1c6266593b6a --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:18:14,889 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:18:15,003 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:18:15,012 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:18:15,012 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:18:15,062 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:18:15,063 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:18:15,063 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:18:15,065 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:18:15,070 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:18:15,070 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:18:15,072 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:18:15,072 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:18:15,074 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:18:15,074 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:18:15,075 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:18:15,075 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:18:15,075 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:18:15,076 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:18:15,076 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:18:15,077 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:18:15,077 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:18:15,079 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:18:15,079 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:18:15,080 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:18:15,080 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:18:15,081 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:18:15,081 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:18:15,081 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:18:15,082 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:18:15,083 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:18:15,084 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:18:15,084 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:18:15,084 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:18:15,085 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:18:15,085 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:18:15,086 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:18:15,086 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:18:15,086 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:18:15,087 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:18:15,087 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:18:15,088 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:18:15,088 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:18:15,088 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:18:15,089 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:18:15,089 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:18:15,089 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:18:15,089 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_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 90b7e6947bda838aad0c5e01877b9a712c46c1a2dc1a2af9f1fb1c6266593b6a [2023-11-23 21:18:15,436 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:18:15,471 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:18:15,474 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:18:15,477 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:18:15,477 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:18:15,478 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-crafted/xor4.i [2023-11-23 21:18:18,699 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:18:18,944 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:18:18,944 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/sv-benchmarks/c/array-crafted/xor4.i [2023-11-23 21:18:18,954 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/data/20ca4d05d/edc8d19221574e1d91af4d0b498a358b/FLAG0fb55ad89 [2023-11-23 21:18:18,973 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/data/20ca4d05d/edc8d19221574e1d91af4d0b498a358b [2023-11-23 21:18:18,979 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:18:18,981 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:18:18,984 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:18:18,985 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:18:18,991 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:18:18,992 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:18:18" (1/1) ... [2023-11-23 21:18:18,993 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cc88da1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:18, skipping insertion in model container [2023-11-23 21:18:18,993 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:18:18" (1/1) ... [2023-11-23 21:18:19,021 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:18:19,254 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/sv-benchmarks/c/array-crafted/xor4.i[1303,1316] [2023-11-23 21:18:19,261 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:18:19,282 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:18:19,320 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/sv-benchmarks/c/array-crafted/xor4.i[1303,1316] [2023-11-23 21:18:19,321 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:18:19,342 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:18:19,343 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19 WrapperNode [2023-11-23 21:18:19,344 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:18:19,346 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:18:19,346 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:18:19,346 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:18:19,354 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,376 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,410 INFO L138 Inliner]: procedures = 16, calls = 30, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 76 [2023-11-23 21:18:19,410 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:18:19,411 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:18:19,411 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:18:19,411 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:18:19,421 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,421 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,424 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,424 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,440 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,453 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,457 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,472 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,475 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:18:19,476 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:18:19,476 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:18:19,476 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:18:19,477 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (1/1) ... [2023-11-23 21:18:19,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:18:19,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:19,513 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:18:19,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:18:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:18:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:18:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:18:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:18:19,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:18:19,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:18:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:18:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure xor [2023-11-23 21:18:19,552 INFO L138 BoogieDeclarations]: Found implementation of procedure xor [2023-11-23 21:18:19,552 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:18:19,630 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:18:19,632 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:18:19,881 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:18:20,032 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:18:20,033 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 21:18:20,034 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:18:20 BoogieIcfgContainer [2023-11-23 21:18:20,035 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:18:20,038 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:18:20,038 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:18:20,045 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:18:20,045 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:18:18" (1/3) ... [2023-11-23 21:18:20,046 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@679bb479 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:18:20, skipping insertion in model container [2023-11-23 21:18:20,047 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:19" (2/3) ... [2023-11-23 21:18:20,049 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@679bb479 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:18:20, skipping insertion in model container [2023-11-23 21:18:20,049 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:18:20" (3/3) ... [2023-11-23 21:18:20,050 INFO L112 eAbstractionObserver]: Analyzing ICFG xor4.i [2023-11-23 21:18:20,069 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:18:20,069 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:18:20,119 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:18:20,126 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;@3abc9f77, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:18:20,126 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:18:20,131 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:20,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:18:20,139 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:20,139 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:20,140 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:20,146 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:20,146 INFO L85 PathProgramCache]: Analyzing trace with hash -1058294620, now seen corresponding path program 1 times [2023-11-23 21:18:20,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:20,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135699831] [2023-11-23 21:18:20,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:20,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:20,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:20,521 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:18:20,521 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:20,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135699831] [2023-11-23 21:18:20,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135699831] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:20,523 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:18:20,523 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:18:20,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265109692] [2023-11-23 21:18:20,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:20,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:20,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:20,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:20,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:20,564 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:18:20,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:20,649 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-11-23 21:18:20,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:20,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2023-11-23 21:18:20,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:20,662 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:18:20,662 INFO L226 Difference]: Without dead ends: 16 [2023-11-23 21:18:20,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:20,674 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:20,676 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:20,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-23 21:18:20,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-23 21:18:20,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:20,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-23 21:18:20,740 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2023-11-23 21:18:20,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:20,741 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-23 21:18:20,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:18:20,742 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-23 21:18:20,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 21:18:20,745 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:20,745 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:20,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:18:20,746 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:20,747 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:20,748 INFO L85 PathProgramCache]: Analyzing trace with hash 2011330010, now seen corresponding path program 1 times [2023-11-23 21:18:20,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:20,749 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050158949] [2023-11-23 21:18:20,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:20,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:20,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:20,941 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:18:20,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:20,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050158949] [2023-11-23 21:18:20,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2050158949] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:20,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004404509] [2023-11-23 21:18:20,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:20,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:20,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:20,945 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:20,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:18:21,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:21,061 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:18:21,067 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:21,090 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:18:21,090 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:18:21,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004404509] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:21,091 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:18:21,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-23 21:18:21,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522882962] [2023-11-23 21:18:21,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:21,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:21,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:21,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:21,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:18:21,094 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:18:21,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:21,118 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-11-23 21:18:21,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:21,119 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-23 21:18:21,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:21,120 INFO L225 Difference]: With dead ends: 29 [2023-11-23 21:18:21,120 INFO L226 Difference]: Without dead ends: 17 [2023-11-23 21:18:21,120 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:18:21,122 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:21,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:21,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-23 21:18:21,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-23 21:18:21,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:21,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-23 21:18:21,128 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2023-11-23 21:18:21,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:21,129 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-23 21:18:21,129 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:18:21,129 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-23 21:18:21,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:18:21,131 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:21,131 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:21,160 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:21,350 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:21,350 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:21,351 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:21,351 INFO L85 PathProgramCache]: Analyzing trace with hash -2141200811, now seen corresponding path program 1 times [2023-11-23 21:18:21,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:21,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807552795] [2023-11-23 21:18:21,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:21,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:21,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:21,531 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:18:21,532 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:21,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807552795] [2023-11-23 21:18:21,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [807552795] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:21,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414773310] [2023-11-23 21:18:21,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:21,533 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:21,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:21,537 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:21,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:18:21,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:21,688 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:18:21,693 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:21,721 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:18:21,722 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:18:21,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414773310] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:21,723 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:18:21,723 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-23 21:18:21,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034988000] [2023-11-23 21:18:21,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:21,724 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:21,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:21,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:21,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:18:21,727 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:18:21,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:21,760 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-11-23 21:18:21,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:21,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-23 21:18:21,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:21,763 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:18:21,763 INFO L226 Difference]: Without dead ends: 18 [2023-11-23 21:18:21,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:18:21,767 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:21,767 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:21,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-23 21:18:21,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-23 21:18:21,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:21,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-23 21:18:21,773 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2023-11-23 21:18:21,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:21,774 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-23 21:18:21,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:18:21,775 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-23 21:18:21,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:18:21,776 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:21,776 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:21,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:21,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-23 21:18:21,992 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:21,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:21,993 INFO L85 PathProgramCache]: Analyzing trace with hash 80184319, now seen corresponding path program 1 times [2023-11-23 21:18:21,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:21,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732774591] [2023-11-23 21:18:21,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:21,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:22,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:22,098 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 21:18:22,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:22,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732774591] [2023-11-23 21:18:22,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732774591] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:22,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473225779] [2023-11-23 21:18:22,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:22,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:22,100 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:22,101 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:22,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:18:22,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:22,211 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:18:22,214 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:22,255 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 21:18:22,255 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:22,305 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 21:18:22,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473225779] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:22,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890383576] [2023-11-23 21:18:22,328 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:22,328 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:22,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:22,338 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:22,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:23,453 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:23,765 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:24,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '522#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:24,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:24,190 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:24,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-11-23 21:18:24,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599801377] [2023-11-23 21:18:24,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:24,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:18:24,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:24,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:18:24,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-23 21:18:24,195 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:24,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:24,237 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-11-23 21:18:24,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:18:24,239 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2023-11-23 21:18:24,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:24,240 INFO L225 Difference]: With dead ends: 36 [2023-11-23 21:18:24,240 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:18:24,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-23 21:18:24,244 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:24,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:24,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:18:24,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-23 21:18:24,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:24,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-23 21:18:24,259 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2023-11-23 21:18:24,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:24,260 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-23 21:18:24,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:24,260 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-23 21:18:24,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 21:18:24,262 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:24,262 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:24,287 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:24,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:24,483 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:24,483 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:24,484 INFO L85 PathProgramCache]: Analyzing trace with hash 559360841, now seen corresponding path program 2 times [2023-11-23 21:18:24,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:24,484 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2040681064] [2023-11-23 21:18:24,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:24,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:24,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:24,675 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:18:24,675 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:24,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2040681064] [2023-11-23 21:18:24,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2040681064] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:24,676 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469203045] [2023-11-23 21:18:24,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:18:24,677 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:24,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:24,681 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:24,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:18:24,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:18:24,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:24,773 INFO L262 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:18:24,783 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:24,796 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:18:24,797 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:24,829 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:18:24,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469203045] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:24,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342969995] [2023-11-23 21:18:24,835 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:24,835 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:24,835 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:24,836 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:24,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:25,364 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:25,576 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:25,952 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:25,952 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:25,952 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:25,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-23 21:18:25,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989961833] [2023-11-23 21:18:25,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:25,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:18:25,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:25,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:18:25,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-23 21:18:25,955 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:26,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:26,006 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-11-23 21:18:26,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:18:26,007 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2023-11-23 21:18:26,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:26,010 INFO L225 Difference]: With dead ends: 38 [2023-11-23 21:18:26,010 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:18:26,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-23 21:18:26,012 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:26,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:26,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:18:26,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:18:26,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:26,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-11-23 21:18:26,028 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2023-11-23 21:18:26,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:26,028 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-11-23 21:18:26,029 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:26,029 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-11-23 21:18:26,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-23 21:18:26,032 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:26,032 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:26,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:26,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:26,258 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:26,258 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:26,258 INFO L85 PathProgramCache]: Analyzing trace with hash -40513086, now seen corresponding path program 3 times [2023-11-23 21:18:26,259 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:26,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507363695] [2023-11-23 21:18:26,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:26,259 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:26,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:26,459 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-11-23 21:18:26,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:26,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1507363695] [2023-11-23 21:18:26,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1507363695] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:26,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534970423] [2023-11-23 21:18:26,460 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:18:26,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:26,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:26,462 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:26,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:18:26,591 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:18:26,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:26,593 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:18:26,599 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:26,645 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-23 21:18:26,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:26,726 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-23 21:18:26,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534970423] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:26,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179816173] [2023-11-23 21:18:26,731 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:26,731 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:26,731 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:26,732 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:26,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:27,251 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:27,436 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:27,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1137#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:27,852 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:27,853 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:27,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2023-11-23 21:18:27,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614777863] [2023-11-23 21:18:27,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:27,854 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:18:27,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:27,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:18:27,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=524, Unknown=9, NotChecked=0, Total=650 [2023-11-23 21:18:27,855 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:18:27,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:27,902 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2023-11-23 21:18:27,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:18:27,903 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2023-11-23 21:18:27,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:27,904 INFO L225 Difference]: With dead ends: 49 [2023-11-23 21:18:27,904 INFO L226 Difference]: Without dead ends: 31 [2023-11-23 21:18:27,905 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=117, Invalid=524, Unknown=9, NotChecked=0, Total=650 [2023-11-23 21:18:27,906 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:27,906 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:27,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-23 21:18:27,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-23 21:18:27,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:27,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-11-23 21:18:27,920 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2023-11-23 21:18:27,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:27,920 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-11-23 21:18:27,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:18:27,921 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-11-23 21:18:27,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 21:18:27,923 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:27,923 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:27,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:28,145 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:28,145 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:28,145 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:28,146 INFO L85 PathProgramCache]: Analyzing trace with hash 841395812, now seen corresponding path program 4 times [2023-11-23 21:18:28,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:28,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017941512] [2023-11-23 21:18:28,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:28,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:28,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:28,570 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-23 21:18:28,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:28,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017941512] [2023-11-23 21:18:28,571 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017941512] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:28,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877512850] [2023-11-23 21:18:28,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:18:28,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:28,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:28,573 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:28,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:18:28,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:28,702 INFO L262 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:18:28,705 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:28,731 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-23 21:18:28,732 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:28,961 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-23 21:18:28,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877512850] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:28,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [544696388] [2023-11-23 21:18:28,964 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:28,965 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:28,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:28,965 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:28,965 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:29,425 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:29,574 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:30,004 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1569#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:30,004 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:30,004 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:30,004 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2023-11-23 21:18:30,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439791302] [2023-11-23 21:18:30,005 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:30,006 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 21:18:30,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:30,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 21:18:30,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=346, Invalid=977, Unknown=9, NotChecked=0, Total=1332 [2023-11-23 21:18:30,008 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:30,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:30,074 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2023-11-23 21:18:30,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:18:30,075 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2023-11-23 21:18:30,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:30,075 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:18:30,076 INFO L226 Difference]: Without dead ends: 43 [2023-11-23 21:18:30,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=346, Invalid=977, Unknown=9, NotChecked=0, Total=1332 [2023-11-23 21:18:30,078 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:30,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:30,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-23 21:18:30,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-11-23 21:18:30,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:30,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2023-11-23 21:18:30,084 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 44 [2023-11-23 21:18:30,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:30,085 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2023-11-23 21:18:30,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:30,085 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2023-11-23 21:18:30,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-23 21:18:30,086 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:30,086 INFO L195 NwaCegarLoop]: trace histogram [22, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:30,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:30,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:18:30,308 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:30,308 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:30,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1359595236, now seen corresponding path program 5 times [2023-11-23 21:18:30,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:30,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435122849] [2023-11-23 21:18:30,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:30,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:30,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:31,259 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-23 21:18:31,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:31,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435122849] [2023-11-23 21:18:31,259 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435122849] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:31,259 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104528210] [2023-11-23 21:18:31,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:18:31,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:31,260 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:31,261 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:31,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:18:31,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:18:31,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:31,383 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:18:31,394 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:31,490 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2023-11-23 21:18:31,490 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:31,622 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2023-11-23 21:18:31,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104528210] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:31,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2047557768] [2023-11-23 21:18:31,625 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:31,625 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:31,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:31,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:31,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:32,053 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:32,214 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:32,824 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2133#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:32,825 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:32,825 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:32,825 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2023-11-23 21:18:32,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144528569] [2023-11-23 21:18:32,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:32,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-23 21:18:32,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:32,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-23 21:18:32,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=1742, Unknown=9, NotChecked=0, Total=2162 [2023-11-23 21:18:32,829 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:32,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:32,955 INFO L93 Difference]: Finished difference Result 69 states and 86 transitions. [2023-11-23 21:18:32,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-23 21:18:32,956 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 56 [2023-11-23 21:18:32,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:32,957 INFO L225 Difference]: With dead ends: 69 [2023-11-23 21:18:32,957 INFO L226 Difference]: Without dead ends: 50 [2023-11-23 21:18:32,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=411, Invalid=1742, Unknown=9, NotChecked=0, Total=2162 [2023-11-23 21:18:32,960 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:32,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 137 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:32,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-23 21:18:32,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-23 21:18:32,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:32,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2023-11-23 21:18:32,969 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 56 [2023-11-23 21:18:32,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:32,969 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2023-11-23 21:18:32,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:32,970 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2023-11-23 21:18:32,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:18:32,972 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:32,972 INFO L195 NwaCegarLoop]: trace histogram [30, 23, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:32,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:33,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:18:33,176 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:33,177 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:33,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1861244422, now seen corresponding path program 6 times [2023-11-23 21:18:33,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:33,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169676091] [2023-11-23 21:18:33,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:33,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:33,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:34,568 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:34,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:34,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169676091] [2023-11-23 21:18:34,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169676091] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:34,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269340499] [2023-11-23 21:18:34,568 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:18:34,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:34,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:34,570 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:34,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:18:34,772 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:18:34,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:34,777 INFO L262 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 21:18:34,780 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:34,833 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:34,833 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:35,689 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:35,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269340499] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:35,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [705297818] [2023-11-23 21:18:35,691 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:35,692 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:35,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:35,692 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:35,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:36,091 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:36,259 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:36,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2855#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:36,775 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:36,776 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:36,776 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2023-11-23 21:18:36,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447955137] [2023-11-23 21:18:36,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:36,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-23 21:18:36,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:36,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-23 21:18:36,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1321, Invalid=2576, Unknown=9, NotChecked=0, Total=3906 [2023-11-23 21:18:36,780 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:36,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:36,903 INFO L93 Difference]: Finished difference Result 100 states and 132 transitions. [2023-11-23 21:18:36,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-23 21:18:36,904 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 75 [2023-11-23 21:18:36,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:36,907 INFO L225 Difference]: With dead ends: 100 [2023-11-23 21:18:36,908 INFO L226 Difference]: Without dead ends: 75 [2023-11-23 21:18:36,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1321, Invalid=2576, Unknown=9, NotChecked=0, Total=3906 [2023-11-23 21:18:36,913 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:36,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 60 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:36,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-23 21:18:36,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2023-11-23 21:18:36,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:36,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2023-11-23 21:18:36,924 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 75 [2023-11-23 21:18:36,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:36,924 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2023-11-23 21:18:36,924 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 51 states have internal predecessors, (65), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:36,925 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2023-11-23 21:18:36,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-23 21:18:36,926 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:36,926 INFO L195 NwaCegarLoop]: trace histogram [48, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:36,945 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:37,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:37,136 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:37,136 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:37,136 INFO L85 PathProgramCache]: Analyzing trace with hash -458574588, now seen corresponding path program 7 times [2023-11-23 21:18:37,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:37,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83750641] [2023-11-23 21:18:37,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:37,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:37,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:40,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:40,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83750641] [2023-11-23 21:18:40,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83750641] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:40,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190685864] [2023-11-23 21:18:40,459 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:18:40,459 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:40,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:40,461 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:40,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:18:40,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:40,762 INFO L262 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-23 21:18:40,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:40,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:40,880 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:44,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1713 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:44,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190685864] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:44,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1952987462] [2023-11-23 21:18:44,439 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:44,439 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:44,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:44,439 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:44,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:44,846 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:44,998 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:45,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3889#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:45,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:45,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:45,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 51] total 101 [2023-11-23 21:18:45,695 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763032654] [2023-11-23 21:18:45,695 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:45,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-11-23 21:18:45,696 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:45,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-11-23 21:18:45,703 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5096, Invalid=7551, Unknown=9, NotChecked=0, Total=12656 [2023-11-23 21:18:45,703 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:45,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:45,929 INFO L93 Difference]: Finished difference Result 150 states and 207 transitions. [2023-11-23 21:18:45,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-11-23 21:18:45,930 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 100 [2023-11-23 21:18:45,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:45,932 INFO L225 Difference]: With dead ends: 150 [2023-11-23 21:18:45,932 INFO L226 Difference]: Without dead ends: 125 [2023-11-23 21:18:45,941 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 238 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1982 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5096, Invalid=7551, Unknown=9, NotChecked=0, Total=12656 [2023-11-23 21:18:45,942 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:45,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 60 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:45,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-23 21:18:45,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2023-11-23 21:18:45,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:45,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 129 transitions. [2023-11-23 21:18:45,979 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 129 transitions. Word has length 100 [2023-11-23 21:18:45,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:45,980 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 129 transitions. [2023-11-23 21:18:45,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 101 states have internal predecessors, (115), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:18:45,981 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 129 transitions. [2023-11-23 21:18:45,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-11-23 21:18:45,992 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:45,992 INFO L195 NwaCegarLoop]: trace histogram [98, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:46,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:46,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:18:46,208 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:46,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:46,208 INFO L85 PathProgramCache]: Analyzing trace with hash -485442108, now seen corresponding path program 8 times [2023-11-23 21:18:46,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:46,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111113095] [2023-11-23 21:18:46,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:46,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:46,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:55,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-23 21:18:55,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:55,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111113095] [2023-11-23 21:18:55,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111113095] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:55,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257157744] [2023-11-23 21:18:55,148 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:18:55,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:55,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:55,149 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:55,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:18:55,388 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:18:55,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:55,390 INFO L262 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:18:55,396 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:55,558 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 246 proven. 3 refuted. 0 times theorem prover too weak. 5139 trivial. 0 not checked. [2023-11-23 21:18:55,559 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:55,750 INFO L134 CoverageAnalysis]: Checked inductivity of 5388 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 5385 trivial. 0 not checked. [2023-11-23 21:18:55,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257157744] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:55,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006450850] [2023-11-23 21:18:55,753 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:18:55,753 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:55,753 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:55,754 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:55,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:56,188 INFO L197 IcfgInterpreter]: Interpreting procedure xor with input of size 10 for LOIs [2023-11-23 21:18:56,345 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:57,396 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5429#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (or (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~0#1|)) (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~0#1|))) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647) (<= 0 (+ |ULTIMATE.start_main_~ret~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~0#1| 2147483647))' at error location [2023-11-23 21:18:57,397 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:57,397 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:57,397 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 5, 5] total 107 [2023-11-23 21:18:57,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070218806] [2023-11-23 21:18:57,397 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:57,398 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2023-11-23 21:18:57,398 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:57,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2023-11-23 21:18:57,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5123, Invalid=8910, Unknown=9, NotChecked=0, Total=14042 [2023-11-23 21:18:57,406 INFO L87 Difference]: Start difference. First operand 125 states and 129 transitions. Second operand has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:57,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:57,599 INFO L93 Difference]: Finished difference Result 155 states and 167 transitions. [2023-11-23 21:18:57,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2023-11-23 21:18:57,600 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 150 [2023-11-23 21:18:57,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:57,602 INFO L225 Difference]: With dead ends: 155 [2023-11-23 21:18:57,602 INFO L226 Difference]: Without dead ends: 130 [2023-11-23 21:18:57,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=5123, Invalid=8910, Unknown=9, NotChecked=0, Total=14042 [2023-11-23 21:18:57,606 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:57,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 105 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:57,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-23 21:18:57,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2023-11-23 21:18:57,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.024) internal successors, (128), 125 states have internal predecessors, (128), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:18:57,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 134 transitions. [2023-11-23 21:18:57,619 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 134 transitions. Word has length 150 [2023-11-23 21:18:57,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:57,620 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 134 transitions. [2023-11-23 21:18:57,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1682242990654206) internal successors, (125), 107 states have internal predecessors, (125), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:18:57,620 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 134 transitions. [2023-11-23 21:18:57,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2023-11-23 21:18:57,622 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:57,622 INFO L195 NwaCegarLoop]: trace histogram [99, 30, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:57,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:57,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8c29ba74-2238-4c84-ab5a-fdad070093d8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 21:18:57,840 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:57,840 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:57,840 INFO L85 PathProgramCache]: Analyzing trace with hash -756587014, now seen corresponding path program 9 times [2023-11-23 21:18:57,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:57,841 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410750883] [2023-11-23 21:18:57,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:57,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:58,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat