./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/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_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/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_350e3266-1e37-4a8d-bb71-7e8ea6914b34/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 2b1388abaa4e1eba1b8614ad84be6c9957891eba0ae8b60c38d7c0c7ff057a9e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:14:37,379 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:14:37,516 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:14:37,525 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:14:37,527 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:14:37,580 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:14:37,581 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:14:37,582 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:14:37,583 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:14:37,590 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:14:37,590 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:14:37,591 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:14:37,592 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:14:37,594 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:14:37,595 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:14:37,595 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:14:37,596 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:14:37,596 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:14:37,597 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:14:37,599 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:14:37,600 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:14:37,601 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:14:37,602 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:14:37,603 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:14:37,603 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:14:37,604 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:14:37,604 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:14:37,605 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:14:37,605 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:14:37,606 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:14:37,608 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:14:37,608 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:14:37,608 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:14:37,609 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:14:37,609 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:14:37,632 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:14:37,633 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:14:37,633 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:14:37,634 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:14:37,634 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:14:37,634 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:14:37,635 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:14:37,635 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:14:37,635 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:14:37,636 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:14:37,636 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:14:37,637 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:14:37,637 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_350e3266-1e37-4a8d-bb71-7e8ea6914b34/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2b1388abaa4e1eba1b8614ad84be6c9957891eba0ae8b60c38d7c0c7ff057a9e [2023-11-23 21:14:38,035 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:14:38,102 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:14:38,105 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:14:38,107 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:14:38,108 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:14:38,109 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i [2023-11-23 21:14:41,474 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:14:41,964 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:14:41,965 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i [2023-11-23 21:14:41,999 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/data/fabc34d6f/be7306d688d54ef493ca768f1e221da0/FLAGc986df75f [2023-11-23 21:14:42,021 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/data/fabc34d6f/be7306d688d54ef493ca768f1e221da0 [2023-11-23 21:14:42,027 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:14:42,029 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:14:42,032 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:14:42,033 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:14:42,038 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:14:42,039 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:14:42" (1/1) ... [2023-11-23 21:14:42,040 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e0163fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:42, skipping insertion in model container [2023-11-23 21:14:42,040 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:14:42" (1/1) ... [2023-11-23 21:14:42,138 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:14:42,455 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 21:14:42,989 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_350e3266-1e37-4a8d-bb71-7e8ea6914b34/sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i[63639,63652] [2023-11-23 21:14:43,182 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:14:43,295 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:14:43,314 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 21:14:43,341 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_350e3266-1e37-4a8d-bb71-7e8ea6914b34/sv-benchmarks/c/neural-networks/vdp_0_safe.c-amalgamation.i[63639,63652] [2023-11-23 21:14:43,437 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:14:43,730 WARN L675 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:14:43,738 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:14:43,739 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43 WrapperNode [2023-11-23 21:14:43,739 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:14:43,740 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:14:43,740 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:14:43,740 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:14:43,746 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:43,802 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:43,936 INFO L138 Inliner]: procedures = 620, calls = 1413, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 1680 [2023-11-23 21:14:43,937 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:14:43,938 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:14:43,938 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:14:43,938 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:14:43,949 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:43,950 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:43,972 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:43,973 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,045 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,052 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,059 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,069 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,083 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:14:44,084 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:14:44,084 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:14:44,084 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:14:44,085 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (1/1) ... [2023-11-23 21:14:44,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:14:44,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:44,125 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:14:44,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:14:44,178 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2023-11-23 21:14:44,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:14:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~real [2023-11-23 21:14:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~real [2023-11-23 21:14:44,179 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:14:44,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:14:44,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:14:44,180 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:14:44,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:14:44,408 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:14:44,411 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:14:46,794 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:14:47,581 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:14:47,581 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-23 21:14:47,583 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:14:47 BoogieIcfgContainer [2023-11-23 21:14:47,584 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:14:47,587 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:14:47,587 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:14:47,590 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:14:47,592 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:14:42" (1/3) ... [2023-11-23 21:14:47,594 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73a16709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:14:47, skipping insertion in model container [2023-11-23 21:14:47,595 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:14:43" (2/3) ... [2023-11-23 21:14:47,596 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73a16709 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:14:47, skipping insertion in model container [2023-11-23 21:14:47,596 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:14:47" (3/3) ... [2023-11-23 21:14:47,598 INFO L112 eAbstractionObserver]: Analyzing ICFG vdp_0_safe.c-amalgamation.i [2023-11-23 21:14:47,620 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:14:47,620 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:14:47,687 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:14:47,699 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;@f93c70f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:14:47,700 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:14:47,705 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:47,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:14:47,713 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:47,715 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:47,715 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:47,724 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:47,724 INFO L85 PathProgramCache]: Analyzing trace with hash -1277788918, now seen corresponding path program 1 times [2023-11-23 21:14:47,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:47,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985189384] [2023-11-23 21:14:47,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:47,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:48,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:48,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:48,840 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:48,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985189384] [2023-11-23 21:14:48,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985189384] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:48,843 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:48,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:14:48,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499348133] [2023-11-23 21:14:48,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:48,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:48,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:48,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:48,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:14:48,899 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:49,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:49,121 INFO L93 Difference]: Finished difference Result 30 states and 49 transitions. [2023-11-23 21:14:49,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:49,124 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:14:49,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:49,134 INFO L225 Difference]: With dead ends: 30 [2023-11-23 21:14:49,134 INFO L226 Difference]: Without dead ends: 16 [2023-11-23 21:14:49,138 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 21:14:49,143 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:49,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:49,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-23 21:14:49,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-23 21:14:49,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:49,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 26 transitions. [2023-11-23 21:14:49,185 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 26 transitions. Word has length 8 [2023-11-23 21:14:49,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:49,186 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 26 transitions. [2023-11-23 21:14:49,186 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:49,186 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 26 transitions. [2023-11-23 21:14:49,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:14:49,187 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:49,188 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:49,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:14:49,188 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:49,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:49,189 INFO L85 PathProgramCache]: Analyzing trace with hash 1709586107, now seen corresponding path program 1 times [2023-11-23 21:14:49,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:49,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280507536] [2023-11-23 21:14:49,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:49,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:49,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:49,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:49,783 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:49,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280507536] [2023-11-23 21:14:49,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280507536] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:49,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526663797] [2023-11-23 21:14:49,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:49,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:49,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:49,791 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:49,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:14:50,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:50,463 INFO L262 TraceCheckSpWp]: Trace formula consists of 1847 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:14:50,470 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:50,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:14:50,495 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:50,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:50,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526663797] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:50,558 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:50,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 6 [2023-11-23 21:14:50,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871935608] [2023-11-23 21:14:50,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:50,560 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:50,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:50,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:50,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:50,561 INFO L87 Difference]: Start difference. First operand 16 states and 26 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:50,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:50,722 INFO L93 Difference]: Finished difference Result 23 states and 36 transitions. [2023-11-23 21:14:50,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:50,723 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:14:50,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:50,724 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:14:50,724 INFO L226 Difference]: Without dead ends: 17 [2023-11-23 21:14:50,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:50,727 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:50,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:50,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-23 21:14:50,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-23 21:14:50,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 16 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:50,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 27 transitions. [2023-11-23 21:14:50,733 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 27 transitions. Word has length 9 [2023-11-23 21:14:50,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:50,734 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 27 transitions. [2023-11-23 21:14:50,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:50,734 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 27 transitions. [2023-11-23 21:14:50,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:14:50,735 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:50,735 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:50,765 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:50,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:50,949 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:50,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:50,949 INFO L85 PathProgramCache]: Analyzing trace with hash 1473190729, now seen corresponding path program 1 times [2023-11-23 21:14:50,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:50,950 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2035274649] [2023-11-23 21:14:50,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:50,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:51,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:51,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:14:51,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:51,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2035274649] [2023-11-23 21:14:51,516 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2035274649] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:51,517 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331754605] [2023-11-23 21:14:51,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:51,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:51,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:51,523 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:51,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:14:52,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:52,159 INFO L262 TraceCheckSpWp]: Trace formula consists of 1859 conjuncts, 11 conjunts are in the unsatisfiable core [2023-11-23 21:14:52,164 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:52,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:14:52,188 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:14:52,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331754605] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:52,189 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:14:52,189 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-23 21:14:52,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679136144] [2023-11-23 21:14:52,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:52,190 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:52,191 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:52,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:52,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:14:52,193 INFO L87 Difference]: Start difference. First operand 17 states and 27 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:52,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:52,341 INFO L93 Difference]: Finished difference Result 33 states and 53 transitions. [2023-11-23 21:14:52,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:52,343 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-23 21:14:52,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:52,344 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:14:52,344 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:14:52,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 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 21:14:52,346 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:52,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:14:52,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:14:52,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2023-11-23 21:14:52,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:52,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 28 transitions. [2023-11-23 21:14:52,352 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 28 transitions. Word has length 10 [2023-11-23 21:14:52,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:52,353 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 28 transitions. [2023-11-23 21:14:52,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:52,353 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 28 transitions. [2023-11-23 21:14:52,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:14:52,354 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:52,354 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:52,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:52,554 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:52,555 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:52,555 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:52,555 INFO L85 PathProgramCache]: Analyzing trace with hash 984995742, now seen corresponding path program 1 times [2023-11-23 21:14:52,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:52,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884666464] [2023-11-23 21:14:52,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:52,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:52,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:53,058 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:14:53,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:53,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884666464] [2023-11-23 21:14:53,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884666464] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:53,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039718913] [2023-11-23 21:14:53,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:53,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:53,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:53,062 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:53,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:14:53,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:53,749 INFO L262 TraceCheckSpWp]: Trace formula consists of 1865 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:14:53,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:53,801 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:14:53,801 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:53,830 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:53,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039718913] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:53,831 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:53,831 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 7 [2023-11-23 21:14:53,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639429544] [2023-11-23 21:14:53,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:53,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:53,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:53,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:53,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:53,834 INFO L87 Difference]: Start difference. First operand 18 states and 28 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:54,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:54,008 INFO L93 Difference]: Finished difference Result 27 states and 41 transitions. [2023-11-23 21:14:54,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:54,009 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 21:14:54,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:54,010 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:14:54,010 INFO L226 Difference]: Without dead ends: 19 [2023-11-23 21:14:54,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:54,011 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:54,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:54,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-23 21:14:54,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-23 21:14:54,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:54,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 29 transitions. [2023-11-23 21:14:54,017 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 29 transitions. Word has length 12 [2023-11-23 21:14:54,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:54,018 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 29 transitions. [2023-11-23 21:14:54,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:54,018 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 29 transitions. [2023-11-23 21:14:54,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:14:54,019 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:54,019 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:54,053 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:54,219 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:54,220 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:54,220 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:54,220 INFO L85 PathProgramCache]: Analyzing trace with hash 1193656409, now seen corresponding path program 1 times [2023-11-23 21:14:54,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:54,220 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313966359] [2023-11-23 21:14:54,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:54,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:54,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:54,709 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:54,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:54,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313966359] [2023-11-23 21:14:54,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313966359] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:54,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2014607630] [2023-11-23 21:14:54,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:54,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:54,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:54,712 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:54,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:14:55,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:55,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 1871 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:14:55,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:55,388 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:55,389 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:55,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:14:55,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2014607630] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:55,407 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:55,408 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 7 [2023-11-23 21:14:55,408 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069434358] [2023-11-23 21:14:55,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:55,409 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:14:55,409 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:55,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:14:55,410 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:55,410 INFO L87 Difference]: Start difference. First operand 19 states and 29 transitions. Second operand has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:55,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:55,555 INFO L93 Difference]: Finished difference Result 23 states and 33 transitions. [2023-11-23 21:14:55,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:14:55,556 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 21:14:55,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:55,557 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:14:55,557 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:14:55,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:55,558 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:55,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:14:55,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:14:55,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:14:55,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 19 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:55,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 30 transitions. [2023-11-23 21:14:55,565 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 30 transitions. Word has length 14 [2023-11-23 21:14:55,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:55,565 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 30 transitions. [2023-11-23 21:14:55,565 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.666666666666667) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:55,566 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 30 transitions. [2023-11-23 21:14:55,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:14:55,566 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:55,566 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:55,596 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:55,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:55,788 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:55,788 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:55,788 INFO L85 PathProgramCache]: Analyzing trace with hash 212493954, now seen corresponding path program 1 times [2023-11-23 21:14:55,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:55,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344418333] [2023-11-23 21:14:55,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:55,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:55,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:56,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:14:56,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:56,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344418333] [2023-11-23 21:14:56,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344418333] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:56,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792575551] [2023-11-23 21:14:56,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:56,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:56,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:56,299 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:56,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:14:56,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:56,995 INFO L262 TraceCheckSpWp]: Trace formula consists of 1877 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-23 21:14:57,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:57,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:57,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:57,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:14:57,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792575551] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:57,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:57,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 9 [2023-11-23 21:14:57,100 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467003620] [2023-11-23 21:14:57,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:57,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:14:57,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:57,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:14:57,104 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:14:57,104 INFO L87 Difference]: Start difference. First operand 20 states and 30 transitions. Second operand has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:57,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:57,298 INFO L93 Difference]: Finished difference Result 27 states and 40 transitions. [2023-11-23 21:14:57,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:14:57,300 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-23 21:14:57,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:57,301 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:14:57,302 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:14:57,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:14:57,303 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:57,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 13 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:57,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:14:57,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-23 21:14:57,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:57,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2023-11-23 21:14:57,321 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 16 [2023-11-23 21:14:57,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:57,322 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2023-11-23 21:14:57,322 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:57,322 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2023-11-23 21:14:57,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:14:57,324 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:57,324 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:57,359 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:57,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:14:57,540 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:57,540 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:57,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1785124985, now seen corresponding path program 1 times [2023-11-23 21:14:57,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:57,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616993102] [2023-11-23 21:14:57,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:57,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:57,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:58,075 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:14:58,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:58,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616993102] [2023-11-23 21:14:58,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616993102] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:58,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085388109] [2023-11-23 21:14:58,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:58,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:58,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:58,079 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:58,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:14:58,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:58,682 INFO L262 TraceCheckSpWp]: Trace formula consists of 1891 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:14:58,686 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:58,716 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:14:58,717 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:14:58,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085388109] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:58,717 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:14:58,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-11-23 21:14:58,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580224927] [2023-11-23 21:14:58,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:58,719 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:14:58,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:58,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:14:58,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:58,722 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:58,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:58,907 INFO L93 Difference]: Finished difference Result 42 states and 64 transitions. [2023-11-23 21:14:58,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:14:58,908 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-23 21:14:58,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:58,908 INFO L225 Difference]: With dead ends: 42 [2023-11-23 21:14:58,908 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:14:58,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:14:58,910 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:58,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 13 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:14:58,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:14:58,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2023-11-23 21:14:58,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.5238095238095237) internal successors, (32), 21 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:58,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2023-11-23 21:14:58,916 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 18 [2023-11-23 21:14:58,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:58,917 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2023-11-23 21:14:58,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:14:58,917 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2023-11-23 21:14:58,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:14:58,918 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:58,918 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:58,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-23 21:14:59,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:59,137 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:59,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:59,138 INFO L85 PathProgramCache]: Analyzing trace with hash 366812783, now seen corresponding path program 1 times [2023-11-23 21:14:59,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:59,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141004413] [2023-11-23 21:14:59,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:59,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:59,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:59,640 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:14:59,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:59,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141004413] [2023-11-23 21:14:59,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141004413] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:59,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294001371] [2023-11-23 21:14:59,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:59,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:59,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:59,642 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:59,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:15:00,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:00,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 1905 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:15:00,223 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:00,272 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:15:00,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:00,307 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:15:00,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294001371] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:00,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:15:00,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-11-23 21:15:00,309 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935176597] [2023-11-23 21:15:00,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:00,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:00,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:00,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:00,310 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:00,311 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:00,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:00,469 INFO L93 Difference]: Finished difference Result 36 states and 53 transitions. [2023-11-23 21:15:00,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:00,470 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-23 21:15:00,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:00,471 INFO L225 Difference]: With dead ends: 36 [2023-11-23 21:15:00,471 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:15:00,472 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:00,473 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:00,473 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:00,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:15:00,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:15:00,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:00,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 33 transitions. [2023-11-23 21:15:00,480 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 33 transitions. Word has length 20 [2023-11-23 21:15:00,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:00,480 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 33 transitions. [2023-11-23 21:15:00,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:00,480 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 33 transitions. [2023-11-23 21:15:00,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:15:00,481 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:00,481 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:15:00,510 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:00,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:00,696 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:00,696 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:00,696 INFO L85 PathProgramCache]: Analyzing trace with hash -1863643319, now seen corresponding path program 1 times [2023-11-23 21:15:00,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:00,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889647139] [2023-11-23 21:15:00,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:00,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:00,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:01,298 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:15:01,298 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:01,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889647139] [2023-11-23 21:15:01,299 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889647139] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:01,299 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225108709] [2023-11-23 21:15:01,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:01,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:01,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:01,301 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:01,319 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:15:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:01,927 INFO L262 TraceCheckSpWp]: Trace formula consists of 1919 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:15:01,932 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:01,990 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:15:01,990 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:02,029 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:15:02,029 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225108709] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:02,030 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:15:02,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-11-23 21:15:02,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828476383] [2023-11-23 21:15:02,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:02,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:02,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:02,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:02,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:02,036 INFO L87 Difference]: Start difference. First operand 23 states and 33 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:02,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:02,187 INFO L93 Difference]: Finished difference Result 38 states and 55 transitions. [2023-11-23 21:15:02,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:02,187 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-23 21:15:02,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:02,188 INFO L225 Difference]: With dead ends: 38 [2023-11-23 21:15:02,188 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:15:02,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:02,189 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:02,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:02,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:15:02,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:15:02,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.4782608695652173) internal successors, (34), 23 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:02,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 34 transitions. [2023-11-23 21:15:02,204 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 34 transitions. Word has length 22 [2023-11-23 21:15:02,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:02,205 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 34 transitions. [2023-11-23 21:15:02,205 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:02,206 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 34 transitions. [2023-11-23 21:15:02,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:15:02,207 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:02,207 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:15:02,238 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:02,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:02,437 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:02,437 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:02,437 INFO L85 PathProgramCache]: Analyzing trace with hash -1193955972, now seen corresponding path program 1 times [2023-11-23 21:15:02,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:02,438 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441990428] [2023-11-23 21:15:02,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:02,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:02,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:02,976 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:02,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:02,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441990428] [2023-11-23 21:15:02,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441990428] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:02,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959580566] [2023-11-23 21:15:02,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:02,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:02,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:02,980 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:03,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:15:03,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:03,556 INFO L262 TraceCheckSpWp]: Trace formula consists of 1924 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:15:03,560 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:03,581 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:15:03,582 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:03,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959580566] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:03,582 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:03,582 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-11-23 21:15:03,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577024465] [2023-11-23 21:15:03,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:03,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:03,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:03,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:03,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:03,584 INFO L87 Difference]: Start difference. First operand 24 states and 34 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:03,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:03,722 INFO L93 Difference]: Finished difference Result 47 states and 68 transitions. [2023-11-23 21:15:03,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:03,723 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2023-11-23 21:15:03,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:03,723 INFO L225 Difference]: With dead ends: 47 [2023-11-23 21:15:03,724 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:15:03,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:03,725 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:03,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 21 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:03,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:15:03,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-23 21:15:03,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 24 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:03,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 35 transitions. [2023-11-23 21:15:03,732 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 35 transitions. Word has length 23 [2023-11-23 21:15:03,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:03,733 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 35 transitions. [2023-11-23 21:15:03,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 3 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:03,733 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 35 transitions. [2023-11-23 21:15:03,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:15:03,734 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:03,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:15:03,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:03,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:15:03,960 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:03,960 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:03,960 INFO L85 PathProgramCache]: Analyzing trace with hash 538192126, now seen corresponding path program 1 times [2023-11-23 21:15:03,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:03,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829003854] [2023-11-23 21:15:03,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:03,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:04,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:04,531 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 21:15:04,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:04,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829003854] [2023-11-23 21:15:04,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829003854] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:04,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196515400] [2023-11-23 21:15:04,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:04,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:04,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:04,534 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:04,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:15:05,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:05,226 INFO L262 TraceCheckSpWp]: Trace formula consists of 1929 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:15:05,230 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:05,278 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:15:05,279 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:05,321 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:05,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196515400] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:05,322 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:15:05,322 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 6] total 10 [2023-11-23 21:15:05,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699361613] [2023-11-23 21:15:05,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:05,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:05,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:05,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:05,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:05,324 INFO L87 Difference]: Start difference. First operand 25 states and 35 transitions. Second operand has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:05,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:05,452 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2023-11-23 21:15:05,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:05,453 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2023-11-23 21:15:05,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:05,454 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:15:05,455 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:15:05,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:15:05,457 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:05,458 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:05,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:15:05,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:15:05,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:05,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2023-11-23 21:15:05,470 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 24 [2023-11-23 21:15:05,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:05,472 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2023-11-23 21:15:05,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.0) internal successors, (24), 4 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:15:05,472 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2023-11-23 21:15:05,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:15:05,473 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:05,473 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:15:05,500 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:05,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:05,700 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:05,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:05,700 INFO L85 PathProgramCache]: Analyzing trace with hash -1049888234, now seen corresponding path program 1 times [2023-11-23 21:15:05,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:05,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [824898087] [2023-11-23 21:15:05,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:05,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:05,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:06,148 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:15:06,148 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:06,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [824898087] [2023-11-23 21:15:06,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [824898087] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:06,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256090800] [2023-11-23 21:15:06,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:06,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:06,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:06,150 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:06,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_350e3266-1e37-4a8d-bb71-7e8ea6914b34/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 21:15:06,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:06,753 INFO L262 TraceCheckSpWp]: Trace formula consists of 1934 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:15:06,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:06,806 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:15:06,806 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:06,832 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:15:06,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256090800] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:15:06,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [796435559] [2023-11-23 21:15:06,856 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-23 21:15:06,856 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:15:06,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:15:06,866 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:15:06,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs