./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c --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_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/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_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/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_80729715-c171-4539-be8b-5974fe0196f6/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 82bdcd0599c1cc352b3450b4e917b8a69eeb254589d3b948d4951dae1b33e3d4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:34:18,983 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:34:19,094 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:34:19,100 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:34:19,101 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:34:19,142 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:34:19,143 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:34:19,143 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:34:19,144 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:34:19,149 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:34:19,149 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:34:19,151 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:34:19,151 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:34:19,153 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:34:19,153 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:34:19,154 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:34:19,154 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:34:19,154 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:34:19,155 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:34:19,155 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:34:19,156 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:34:19,156 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:34:19,157 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:34:19,158 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:34:19,158 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:34:19,159 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:34:19,159 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:34:19,159 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:34:19,160 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:34:19,160 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:34:19,162 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:34:19,162 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:34:19,162 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:34:19,162 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:34:19,163 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:34:19,163 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:34:19,164 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:34:19,164 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:34:19,164 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:34:19,164 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:34:19,164 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:34:19,165 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:34:19,165 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:34:19,165 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:34:19,166 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:34:19,166 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:34:19,166 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:34:19,166 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_80729715-c171-4539-be8b-5974fe0196f6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 82bdcd0599c1cc352b3450b4e917b8a69eeb254589d3b948d4951dae1b33e3d4 [2023-11-23 20:34:19,418 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:34:19,441 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:34:19,443 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:34:19,445 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:34:19,446 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:34:19,447 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c [2023-11-23 20:34:22,676 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:34:22,911 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:34:22,912 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c [2023-11-23 20:34:22,927 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/data/7051bcad1/4455088425c44729942731a439796479/FLAG1e6986d08 [2023-11-23 20:34:22,942 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/data/7051bcad1/4455088425c44729942731a439796479 [2023-11-23 20:34:22,944 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:34:22,946 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:34:22,948 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:34:22,948 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:34:22,953 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:34:22,954 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:34:22" (1/1) ... [2023-11-23 20:34:22,955 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f65d77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:22, skipping insertion in model container [2023-11-23 20:34:22,956 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:34:22" (1/1) ... [2023-11-23 20:34:23,018 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:34:23,175 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_80729715-c171-4539-be8b-5974fe0196f6/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c[913,926] [2023-11-23 20:34:23,224 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_80729715-c171-4539-be8b-5974fe0196f6/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c[5977,5990] [2023-11-23 20:34:23,302 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:34:23,316 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:34:23,326 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_80729715-c171-4539-be8b-5974fe0196f6/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c[913,926] [2023-11-23 20:34:23,346 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_80729715-c171-4539-be8b-5974fe0196f6/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.04.cil-1.c[5977,5990] [2023-11-23 20:34:23,389 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:34:23,413 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:34:23,413 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23 WrapperNode [2023-11-23 20:34:23,413 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:34:23,414 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:34:23,414 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:34:23,414 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:34:23,420 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,432 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,483 INFO L138 Inliner]: procedures = 56, calls = 60, calls flagged for inlining = 31, calls inlined = 31, statements flattened = 605 [2023-11-23 20:34:23,484 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:34:23,484 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:34:23,485 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:34:23,485 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:34:23,495 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,495 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,500 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,500 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,513 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,524 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,528 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,531 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,549 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:34:23,550 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:34:23,550 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:34:23,550 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:34:23,551 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (1/1) ... [2023-11-23 20:34:23,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:34:23,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:23,590 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:34:23,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:34:23,634 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:34:23,634 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 20:34:23,634 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 20:34:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2023-11-23 20:34:23,635 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2023-11-23 20:34:23,635 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-11-23 20:34:23,635 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-11-23 20:34:23,636 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-11-23 20:34:23,636 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-11-23 20:34:23,636 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-11-23 20:34:23,636 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-11-23 20:34:23,636 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-11-23 20:34:23,637 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-11-23 20:34:23,640 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-11-23 20:34:23,641 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-11-23 20:34:23,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:34:23,642 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-11-23 20:34:23,642 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-11-23 20:34:23,643 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:34:23,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:34:23,645 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-11-23 20:34:23,645 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-11-23 20:34:23,763 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:34:23,765 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:34:24,458 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:34:24,789 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:34:24,789 INFO L309 CfgBuilder]: Removed 11 assume(true) statements. [2023-11-23 20:34:24,791 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:34:24 BoogieIcfgContainer [2023-11-23 20:34:24,791 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:34:24,797 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:34:24,797 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:34:24,800 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:34:24,801 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:34:22" (1/3) ... [2023-11-23 20:34:24,801 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57d20566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:34:24, skipping insertion in model container [2023-11-23 20:34:24,802 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:34:23" (2/3) ... [2023-11-23 20:34:24,803 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57d20566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:34:24, skipping insertion in model container [2023-11-23 20:34:24,804 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:34:24" (3/3) ... [2023-11-23 20:34:24,805 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.04.cil-1.c [2023-11-23 20:34:24,848 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:34:24,848 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 20:34:24,914 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:34:24,922 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;@6e332a1c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:34:24,922 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 20:34:24,927 INFO L276 IsEmpty]: Start isEmpty. Operand has 156 states, 120 states have (on average 1.5166666666666666) internal successors, (182), 125 states have internal predecessors, (182), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-23 20:34:24,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 20:34:24,937 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:24,938 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, 1, 1, 1] [2023-11-23 20:34:24,939 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:24,944 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:24,945 INFO L85 PathProgramCache]: Analyzing trace with hash 1036339024, now seen corresponding path program 1 times [2023-11-23 20:34:24,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:24,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270391451] [2023-11-23 20:34:24,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:24,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:25,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:25,348 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 20:34:25,349 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:25,349 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270391451] [2023-11-23 20:34:25,350 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270391451] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:25,350 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:25,350 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:25,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265765412] [2023-11-23 20:34:25,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:25,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:25,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:25,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:25,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:25,413 INFO L87 Difference]: Start difference. First operand has 156 states, 120 states have (on average 1.5166666666666666) internal successors, (182), 125 states have internal predecessors, (182), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:25,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:25,663 INFO L93 Difference]: Finished difference Result 345 states and 508 transitions. [2023-11-23 20:34:25,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:25,666 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-23 20:34:25,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:25,682 INFO L225 Difference]: With dead ends: 345 [2023-11-23 20:34:25,682 INFO L226 Difference]: Without dead ends: 189 [2023-11-23 20:34:25,689 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 20:34:25,694 INFO L413 NwaCegarLoop]: 195 mSDtfsCounter, 197 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:25,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [197 Valid, 250 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:25,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2023-11-23 20:34:25,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 185. [2023-11-23 20:34:25,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 146 states have (on average 1.4315068493150684) internal successors, (209), 149 states have internal predecessors, (209), 27 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-23 20:34:25,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 261 transitions. [2023-11-23 20:34:25,776 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 261 transitions. Word has length 28 [2023-11-23 20:34:25,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:25,776 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 261 transitions. [2023-11-23 20:34:25,777 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:25,777 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 261 transitions. [2023-11-23 20:34:25,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 20:34:25,780 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:25,780 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, 1, 1, 1, 1] [2023-11-23 20:34:25,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:34:25,781 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:25,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:25,782 INFO L85 PathProgramCache]: Analyzing trace with hash -286610587, now seen corresponding path program 1 times [2023-11-23 20:34:25,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:25,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67650913] [2023-11-23 20:34:25,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:25,783 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:25,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:25,925 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 20:34:25,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:25,926 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67650913] [2023-11-23 20:34:25,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67650913] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:25,927 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:25,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:25,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224100751] [2023-11-23 20:34:25,928 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:25,929 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:25,929 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:25,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:25,930 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:25,931 INFO L87 Difference]: Start difference. First operand 185 states and 261 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:26,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:26,040 INFO L93 Difference]: Finished difference Result 341 states and 478 transitions. [2023-11-23 20:34:26,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:26,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2023-11-23 20:34:26,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:26,047 INFO L225 Difference]: With dead ends: 341 [2023-11-23 20:34:26,047 INFO L226 Difference]: Without dead ends: 260 [2023-11-23 20:34:26,053 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 20:34:26,055 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 195 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:26,056 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 234 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:26,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2023-11-23 20:34:26,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 256. [2023-11-23 20:34:26,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 256 states, 206 states have (on average 1.4077669902912622) internal successors, (290), 209 states have internal predecessors, (290), 34 states have call successors, (34), 15 states have call predecessors, (34), 14 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2023-11-23 20:34:26,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 356 transitions. [2023-11-23 20:34:26,118 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 356 transitions. Word has length 29 [2023-11-23 20:34:26,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:26,119 INFO L495 AbstractCegarLoop]: Abstraction has 256 states and 356 transitions. [2023-11-23 20:34:26,119 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:26,119 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 356 transitions. [2023-11-23 20:34:26,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 20:34:26,128 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:26,128 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, 1, 1, 1, 1, 1] [2023-11-23 20:34:26,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:34:26,129 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:26,135 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:26,140 INFO L85 PathProgramCache]: Analyzing trace with hash 297153354, now seen corresponding path program 1 times [2023-11-23 20:34:26,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:26,141 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210789180] [2023-11-23 20:34:26,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:26,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:26,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:26,231 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 20:34:26,232 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:26,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210789180] [2023-11-23 20:34:26,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210789180] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:26,235 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:26,236 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:26,237 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809930743] [2023-11-23 20:34:26,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:26,238 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:26,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:26,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:26,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:26,245 INFO L87 Difference]: Start difference. First operand 256 states and 356 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:26,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:26,355 INFO L93 Difference]: Finished difference Result 496 states and 684 transitions. [2023-11-23 20:34:26,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:26,355 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2023-11-23 20:34:26,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:26,360 INFO L225 Difference]: With dead ends: 496 [2023-11-23 20:34:26,360 INFO L226 Difference]: Without dead ends: 344 [2023-11-23 20:34:26,367 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 20:34:26,370 INFO L413 NwaCegarLoop]: 193 mSDtfsCounter, 46 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:26,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 359 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:26,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2023-11-23 20:34:26,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 330. [2023-11-23 20:34:26,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 269 states have (on average 1.3940520446096654) internal successors, (375), 274 states have internal predecessors, (375), 40 states have call successors, (40), 20 states have call predecessors, (40), 19 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) [2023-11-23 20:34:26,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 453 transitions. [2023-11-23 20:34:26,438 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 453 transitions. Word has length 30 [2023-11-23 20:34:26,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:26,439 INFO L495 AbstractCegarLoop]: Abstraction has 330 states and 453 transitions. [2023-11-23 20:34:26,439 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:34:26,439 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 453 transitions. [2023-11-23 20:34:26,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 20:34:26,445 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:26,445 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:26,445 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:34:26,445 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:26,446 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:26,446 INFO L85 PathProgramCache]: Analyzing trace with hash 360808027, now seen corresponding path program 1 times [2023-11-23 20:34:26,446 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:26,447 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798742737] [2023-11-23 20:34:26,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:26,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:26,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:26,618 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 20:34:26,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:26,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798742737] [2023-11-23 20:34:26,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798742737] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:26,619 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:26,619 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:34:26,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279898651] [2023-11-23 20:34:26,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:26,621 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:34:26,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:26,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:34:26,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:34:26,623 INFO L87 Difference]: Start difference. First operand 330 states and 453 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:34:26,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:26,926 INFO L93 Difference]: Finished difference Result 519 states and 738 transitions. [2023-11-23 20:34:26,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:34:26,926 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 43 [2023-11-23 20:34:26,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:26,931 INFO L225 Difference]: With dead ends: 519 [2023-11-23 20:34:26,931 INFO L226 Difference]: Without dead ends: 421 [2023-11-23 20:34:26,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:34:26,941 INFO L413 NwaCegarLoop]: 281 mSDtfsCounter, 316 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:26,942 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 486 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:34:26,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2023-11-23 20:34:26,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 420. [2023-11-23 20:34:26,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 339 states have (on average 1.3864306784660767) internal successors, (470), 345 states have internal predecessors, (470), 54 states have call successors, (54), 26 states have call predecessors, (54), 25 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2023-11-23 20:34:26,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 576 transitions. [2023-11-23 20:34:26,984 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 576 transitions. Word has length 43 [2023-11-23 20:34:26,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:26,985 INFO L495 AbstractCegarLoop]: Abstraction has 420 states and 576 transitions. [2023-11-23 20:34:26,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:34:26,986 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 576 transitions. [2023-11-23 20:34:26,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 20:34:26,987 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:26,988 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:26,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:34:26,988 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:26,989 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:26,989 INFO L85 PathProgramCache]: Analyzing trace with hash 469063935, now seen corresponding path program 1 times [2023-11-23 20:34:26,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:26,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269775427] [2023-11-23 20:34:26,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:26,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:27,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:27,075 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 20:34:27,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:27,075 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269775427] [2023-11-23 20:34:27,075 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269775427] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:27,076 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:27,076 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:27,076 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383305542] [2023-11-23 20:34:27,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:27,077 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:27,078 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:27,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:27,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:27,079 INFO L87 Difference]: Start difference. First operand 420 states and 576 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:27,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:27,195 INFO L93 Difference]: Finished difference Result 583 states and 794 transitions. [2023-11-23 20:34:27,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:27,196 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2023-11-23 20:34:27,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:27,201 INFO L225 Difference]: With dead ends: 583 [2023-11-23 20:34:27,201 INFO L226 Difference]: Without dead ends: 425 [2023-11-23 20:34:27,202 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 20:34:27,203 INFO L413 NwaCegarLoop]: 213 mSDtfsCounter, 32 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:27,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 391 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:27,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2023-11-23 20:34:27,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 414. [2023-11-23 20:34:27,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 333 states have (on average 1.3693693693693694) internal successors, (456), 339 states have internal predecessors, (456), 54 states have call successors, (54), 26 states have call predecessors, (54), 25 states have return successors, (52), 49 states have call predecessors, (52), 52 states have call successors, (52) [2023-11-23 20:34:27,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 562 transitions. [2023-11-23 20:34:27,268 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 562 transitions. Word has length 43 [2023-11-23 20:34:27,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:27,268 INFO L495 AbstractCegarLoop]: Abstraction has 414 states and 562 transitions. [2023-11-23 20:34:27,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:27,269 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 562 transitions. [2023-11-23 20:34:27,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-23 20:34:27,271 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:27,271 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:27,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 20:34:27,272 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:27,272 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:27,272 INFO L85 PathProgramCache]: Analyzing trace with hash 2038631276, now seen corresponding path program 1 times [2023-11-23 20:34:27,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:27,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687061382] [2023-11-23 20:34:27,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:27,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:27,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:27,323 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:34:27,324 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:27,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687061382] [2023-11-23 20:34:27,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687061382] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:27,324 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:27,325 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:27,325 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415664133] [2023-11-23 20:34:27,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:27,326 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:27,326 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:27,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:27,327 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:27,327 INFO L87 Difference]: Start difference. First operand 414 states and 562 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 20:34:27,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:27,432 INFO L93 Difference]: Finished difference Result 663 states and 886 transitions. [2023-11-23 20:34:27,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:27,433 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2023-11-23 20:34:27,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:27,437 INFO L225 Difference]: With dead ends: 663 [2023-11-23 20:34:27,437 INFO L226 Difference]: Without dead ends: 460 [2023-11-23 20:34:27,438 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 20:34:27,439 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 180 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:27,439 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 232 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:27,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 460 states. [2023-11-23 20:34:27,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 460 to 460. [2023-11-23 20:34:27,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 372 states have (on average 1.3413978494623655) internal successors, (499), 378 states have internal predecessors, (499), 58 states have call successors, (58), 29 states have call predecessors, (58), 28 states have return successors, (56), 53 states have call predecessors, (56), 56 states have call successors, (56) [2023-11-23 20:34:27,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 613 transitions. [2023-11-23 20:34:27,489 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 613 transitions. Word has length 46 [2023-11-23 20:34:27,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:27,490 INFO L495 AbstractCegarLoop]: Abstraction has 460 states and 613 transitions. [2023-11-23 20:34:27,490 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 20:34:27,490 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 613 transitions. [2023-11-23 20:34:27,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-23 20:34:27,492 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:27,493 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:27,493 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 20:34:27,493 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:27,494 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:27,494 INFO L85 PathProgramCache]: Analyzing trace with hash 871130495, now seen corresponding path program 1 times [2023-11-23 20:34:27,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:27,494 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122268201] [2023-11-23 20:34:27,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:27,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:27,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:27,583 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 20:34:27,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:27,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122268201] [2023-11-23 20:34:27,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122268201] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:27,584 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:27,585 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:34:27,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888085631] [2023-11-23 20:34:27,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:27,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:34:27,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:27,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:34:27,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:34:27,587 INFO L87 Difference]: Start difference. First operand 460 states and 613 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:27,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:27,817 INFO L93 Difference]: Finished difference Result 500 states and 660 transitions. [2023-11-23 20:34:27,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:34:27,817 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2023-11-23 20:34:27,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:27,821 INFO L225 Difference]: With dead ends: 500 [2023-11-23 20:34:27,821 INFO L226 Difference]: Without dead ends: 497 [2023-11-23 20:34:27,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:34:27,823 INFO L413 NwaCegarLoop]: 190 mSDtfsCounter, 336 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:27,823 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 231 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:34:27,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2023-11-23 20:34:27,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 459. [2023-11-23 20:34:27,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 372 states have (on average 1.336021505376344) internal successors, (497), 377 states have internal predecessors, (497), 57 states have call successors, (57), 29 states have call predecessors, (57), 28 states have return successors, (56), 53 states have call predecessors, (56), 56 states have call successors, (56) [2023-11-23 20:34:27,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 610 transitions. [2023-11-23 20:34:27,881 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 610 transitions. Word has length 47 [2023-11-23 20:34:27,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:27,882 INFO L495 AbstractCegarLoop]: Abstraction has 459 states and 610 transitions. [2023-11-23 20:34:27,882 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:34:27,882 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 610 transitions. [2023-11-23 20:34:27,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-23 20:34:27,884 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:27,884 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:27,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 20:34:27,884 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:27,885 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:27,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1234430607, now seen corresponding path program 1 times [2023-11-23 20:34:27,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:27,885 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300615372] [2023-11-23 20:34:27,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:27,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:27,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:28,072 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:34:28,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:28,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300615372] [2023-11-23 20:34:28,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300615372] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:28,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17687555] [2023-11-23 20:34:28,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:28,073 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:28,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:28,075 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:28,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:34:28,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:28,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 20:34:28,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:28,459 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:34:28,459 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:34:28,530 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:34:28,530 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17687555] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:34:28,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2045285277] [2023-11-23 20:34:28,551 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-11-23 20:34:28,552 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:34:28,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:34:28,561 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:34:28,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:34:34,299 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 101 for LOIs [2023-11-23 20:34:34,332 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 126 for LOIs [2023-11-23 20:34:34,395 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 112 for LOIs [2023-11-23 20:34:36,368 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:34:54,508 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8089#(and (<= 1 |#StackHeapBarrier|) (= ~E_4~0 2) (= ~q_buf_0~0 0) (= ~t1_pc~0 0) (not (= ~p_num_write~0 1)) (= ~T4_E~0 2) (= ~p_last_write~0 0) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~m_st~0 0) (= ~q_free~0 1) (= ~c_last_read~0 0) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= ~t2_i~0 0) (= ~t4_i~0 0) (= ~t1_st~0 0) (= ~c_num_read~0 1) (<= ~p_num_write~0 1) (= ~m_i~0 0) (= ~p_dw_pc~0 1) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~p_dw_st~0 0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~c_dr_pc~0 0) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (exists ((|v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4| Int)) (and (<= |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4| 2147483647) (<= 0 (+ 2147483648 |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4|)) (not (= 0 |v_ULTIMATE.start_eval1_~tmp___0~1#1_BEFORE_CALL_4|)))) (= 0 ~t2_pc~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (= ~t1_i~0 0))' at error location [2023-11-23 20:34:54,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:34:54,509 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:34:54,509 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-11-23 20:34:54,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378838535] [2023-11-23 20:34:54,509 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:34:54,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:34:54,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:54,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:34:54,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 20:34:54,512 INFO L87 Difference]: Start difference. First operand 459 states and 610 transitions. Second operand has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-23 20:34:54,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:54,837 INFO L93 Difference]: Finished difference Result 902 states and 1178 transitions. [2023-11-23 20:34:54,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:34:54,838 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2023-11-23 20:34:54,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:54,844 INFO L225 Difference]: With dead ends: 902 [2023-11-23 20:34:54,844 INFO L226 Difference]: Without dead ends: 899 [2023-11-23 20:34:54,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 20:34:54,846 INFO L413 NwaCegarLoop]: 236 mSDtfsCounter, 452 mSDsluCounter, 460 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 452 SdHoareTripleChecker+Valid, 696 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:54,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [452 Valid, 696 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:34:54,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2023-11-23 20:34:54,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 668. [2023-11-23 20:34:54,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 668 states, 549 states have (on average 1.3296903460837888) internal successors, (730), 556 states have internal predecessors, (730), 76 states have call successors, (76), 42 states have call predecessors, (76), 41 states have return successors, (75), 70 states have call predecessors, (75), 75 states have call successors, (75) [2023-11-23 20:34:54,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 668 states to 668 states and 881 transitions. [2023-11-23 20:34:54,903 INFO L78 Accepts]: Start accepts. Automaton has 668 states and 881 transitions. Word has length 48 [2023-11-23 20:34:54,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:54,903 INFO L495 AbstractCegarLoop]: Abstraction has 668 states and 881 transitions. [2023-11-23 20:34:54,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.857142857142858) internal successors, (76), 7 states have internal predecessors, (76), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2023-11-23 20:34:54,904 INFO L276 IsEmpty]: Start isEmpty. Operand 668 states and 881 transitions. [2023-11-23 20:34:54,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-23 20:34:54,906 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:54,906 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:54,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:55,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 20:34:55,128 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:55,129 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:55,129 INFO L85 PathProgramCache]: Analyzing trace with hash 1875276187, now seen corresponding path program 2 times [2023-11-23 20:34:55,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:55,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372652745] [2023-11-23 20:34:55,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:55,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:55,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:55,199 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-23 20:34:55,199 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:55,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372652745] [2023-11-23 20:34:55,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372652745] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:55,200 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:55,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:55,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800623233] [2023-11-23 20:34:55,200 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:55,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:55,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:55,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:55,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:55,202 INFO L87 Difference]: Start difference. First operand 668 states and 881 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 20:34:55,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:55,296 INFO L93 Difference]: Finished difference Result 998 states and 1314 transitions. [2023-11-23 20:34:55,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:55,296 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 61 [2023-11-23 20:34:55,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:55,300 INFO L225 Difference]: With dead ends: 998 [2023-11-23 20:34:55,301 INFO L226 Difference]: Without dead ends: 610 [2023-11-23 20:34:55,302 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 20:34:55,302 INFO L413 NwaCegarLoop]: 203 mSDtfsCounter, 193 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:55,303 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 248 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:34:55,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2023-11-23 20:34:55,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 601. [2023-11-23 20:34:55,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 601 states, 492 states have (on average 1.3191056910569106) internal successors, (649), 500 states have internal predecessors, (649), 70 states have call successors, (70), 38 states have call predecessors, (70), 37 states have return successors, (69), 63 states have call predecessors, (69), 69 states have call successors, (69) [2023-11-23 20:34:55,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 601 states to 601 states and 788 transitions. [2023-11-23 20:34:55,350 INFO L78 Accepts]: Start accepts. Automaton has 601 states and 788 transitions. Word has length 61 [2023-11-23 20:34:55,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:55,351 INFO L495 AbstractCegarLoop]: Abstraction has 601 states and 788 transitions. [2023-11-23 20:34:55,351 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 20:34:55,351 INFO L276 IsEmpty]: Start isEmpty. Operand 601 states and 788 transitions. [2023-11-23 20:34:55,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-23 20:34:55,353 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:55,354 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:55,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 20:34:55,354 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:55,354 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:55,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1342757308, now seen corresponding path program 1 times [2023-11-23 20:34:55,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:55,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977121616] [2023-11-23 20:34:55,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:55,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:55,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:55,501 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 16 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 20:34:55,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:55,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977121616] [2023-11-23 20:34:55,502 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977121616] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:55,502 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648828457] [2023-11-23 20:34:55,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:55,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:55,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:55,503 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:55,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:34:55,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:55,619 INFO L262 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:34:55,622 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:55,641 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 32 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 20:34:55,642 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:55,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648828457] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:55,642 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:34:55,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:34:55,643 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674028389] [2023-11-23 20:34:55,643 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:55,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:55,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:55,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:55,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:55,644 INFO L87 Difference]: Start difference. First operand 601 states and 788 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:34:55,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:55,742 INFO L93 Difference]: Finished difference Result 728 states and 947 transitions. [2023-11-23 20:34:55,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:55,743 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 73 [2023-11-23 20:34:55,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:55,745 INFO L225 Difference]: With dead ends: 728 [2023-11-23 20:34:55,745 INFO L226 Difference]: Without dead ends: 194 [2023-11-23 20:34:55,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:55,747 INFO L413 NwaCegarLoop]: 195 mSDtfsCounter, 25 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:55,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 362 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:55,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2023-11-23 20:34:55,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 194. [2023-11-23 20:34:55,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 149 states have (on average 1.389261744966443) internal successors, (207), 151 states have internal predecessors, (207), 32 states have call successors, (32), 12 states have call predecessors, (32), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2023-11-23 20:34:55,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 271 transitions. [2023-11-23 20:34:55,766 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 271 transitions. Word has length 73 [2023-11-23 20:34:55,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:55,767 INFO L495 AbstractCegarLoop]: Abstraction has 194 states and 271 transitions. [2023-11-23 20:34:55,767 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-23 20:34:55,767 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 271 transitions. [2023-11-23 20:34:55,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-11-23 20:34:55,768 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:55,768 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:55,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:55,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 20:34:55,988 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:55,988 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:55,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1195059052, now seen corresponding path program 1 times [2023-11-23 20:34:55,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:55,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136601016] [2023-11-23 20:34:55,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:55,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:56,105 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:34:56,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:56,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136601016] [2023-11-23 20:34:56,105 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136601016] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:56,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581077529] [2023-11-23 20:34:56,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:56,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:56,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:56,108 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:56,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:34:56,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:56,258 INFO L262 TraceCheckSpWp]: Trace formula consists of 485 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:34:56,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:56,289 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 20:34:56,289 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:56,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581077529] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:56,290 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:34:56,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:34:56,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921173408] [2023-11-23 20:34:56,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:56,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:56,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:56,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:56,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:56,292 INFO L87 Difference]: Start difference. First operand 194 states and 271 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:34:56,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:56,382 INFO L93 Difference]: Finished difference Result 563 states and 798 transitions. [2023-11-23 20:34:56,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:56,382 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2023-11-23 20:34:56,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:56,385 INFO L225 Difference]: With dead ends: 563 [2023-11-23 20:34:56,385 INFO L226 Difference]: Without dead ends: 375 [2023-11-23 20:34:56,386 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:56,387 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 125 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:56,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 266 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:56,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2023-11-23 20:34:56,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 371. [2023-11-23 20:34:56,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 288 states have (on average 1.3819444444444444) internal successors, (398), 291 states have internal predecessors, (398), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2023-11-23 20:34:56,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 514 transitions. [2023-11-23 20:34:56,418 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 514 transitions. Word has length 81 [2023-11-23 20:34:56,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:56,418 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 514 transitions. [2023-11-23 20:34:56,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 2 states have internal predecessors, (48), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:34:56,419 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 514 transitions. [2023-11-23 20:34:56,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-11-23 20:34:56,420 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:56,420 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:56,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:56,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 20:34:56,636 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:56,637 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:56,637 INFO L85 PathProgramCache]: Analyzing trace with hash 1703903052, now seen corresponding path program 1 times [2023-11-23 20:34:56,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:56,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437976651] [2023-11-23 20:34:56,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:56,637 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:56,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:56,734 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:34:56,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:56,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437976651] [2023-11-23 20:34:56,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437976651] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:56,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933877276] [2023-11-23 20:34:56,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:56,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:56,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:56,736 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:56,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:34:56,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:56,886 INFO L262 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:34:56,894 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:56,938 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:34:56,939 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:56,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933877276] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:56,939 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:34:56,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:34:56,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021477821] [2023-11-23 20:34:56,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:56,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:56,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:56,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:56,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:56,943 INFO L87 Difference]: Start difference. First operand 371 states and 514 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:34:57,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:57,069 INFO L93 Difference]: Finished difference Result 1088 states and 1529 transitions. [2023-11-23 20:34:57,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:57,070 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 81 [2023-11-23 20:34:57,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:57,075 INFO L225 Difference]: With dead ends: 1088 [2023-11-23 20:34:57,075 INFO L226 Difference]: Without dead ends: 723 [2023-11-23 20:34:57,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:57,078 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 119 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:57,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 247 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:57,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2023-11-23 20:34:57,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 717. [2023-11-23 20:34:57,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 717 states, 560 states have (on average 1.3714285714285714) internal successors, (768), 565 states have internal predecessors, (768), 108 states have call successors, (108), 48 states have call predecessors, (108), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-23 20:34:57,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 717 states to 717 states and 984 transitions. [2023-11-23 20:34:57,145 INFO L78 Accepts]: Start accepts. Automaton has 717 states and 984 transitions. Word has length 81 [2023-11-23 20:34:57,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:57,145 INFO L495 AbstractCegarLoop]: Abstraction has 717 states and 984 transitions. [2023-11-23 20:34:57,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:34:57,146 INFO L276 IsEmpty]: Start isEmpty. Operand 717 states and 984 transitions. [2023-11-23 20:34:57,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-11-23 20:34:57,148 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:57,148 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:57,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:57,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-23 20:34:57,349 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:57,350 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:57,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1870971092, now seen corresponding path program 1 times [2023-11-23 20:34:57,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:57,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123933241] [2023-11-23 20:34:57,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:57,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:57,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:57,431 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-23 20:34:57,431 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:57,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123933241] [2023-11-23 20:34:57,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2123933241] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:57,432 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:57,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:57,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041845038] [2023-11-23 20:34:57,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:57,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:57,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:57,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:57,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:57,434 INFO L87 Difference]: Start difference. First operand 717 states and 984 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:34:57,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:57,560 INFO L93 Difference]: Finished difference Result 1279 states and 1773 transitions. [2023-11-23 20:34:57,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:57,561 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 81 [2023-11-23 20:34:57,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:57,567 INFO L225 Difference]: With dead ends: 1279 [2023-11-23 20:34:57,567 INFO L226 Difference]: Without dead ends: 913 [2023-11-23 20:34:57,571 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 20:34:57,572 INFO L413 NwaCegarLoop]: 183 mSDtfsCounter, 59 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:57,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 307 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:57,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 913 states. [2023-11-23 20:34:57,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 913 to 841. [2023-11-23 20:34:57,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 676 states have (on average 1.4023668639053255) internal successors, (948), 681 states have internal predecessors, (948), 112 states have call successors, (112), 52 states have call predecessors, (112), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2023-11-23 20:34:57,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 1172 transitions. [2023-11-23 20:34:57,652 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 1172 transitions. Word has length 81 [2023-11-23 20:34:57,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:57,653 INFO L495 AbstractCegarLoop]: Abstraction has 841 states and 1172 transitions. [2023-11-23 20:34:57,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:34:57,654 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 1172 transitions. [2023-11-23 20:34:57,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-23 20:34:57,657 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:57,658 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:34:57,658 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-23 20:34:57,658 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:57,659 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:57,659 INFO L85 PathProgramCache]: Analyzing trace with hash -673053680, now seen corresponding path program 1 times [2023-11-23 20:34:57,659 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:57,659 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1551883043] [2023-11-23 20:34:57,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:57,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:57,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:57,750 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 20:34:57,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:57,750 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1551883043] [2023-11-23 20:34:57,750 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1551883043] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:57,751 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:57,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:57,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532582500] [2023-11-23 20:34:57,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:57,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:57,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:57,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:57,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:57,753 INFO L87 Difference]: Start difference. First operand 841 states and 1172 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:34:57,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:57,942 INFO L93 Difference]: Finished difference Result 2474 states and 3481 transitions. [2023-11-23 20:34:57,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:57,943 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 108 [2023-11-23 20:34:57,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:57,953 INFO L225 Difference]: With dead ends: 2474 [2023-11-23 20:34:57,954 INFO L226 Difference]: Without dead ends: 1639 [2023-11-23 20:34:57,957 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 20:34:57,958 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 112 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:57,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 231 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:57,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1639 states. [2023-11-23 20:34:58,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1639 to 1625. [2023-11-23 20:34:58,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1625 states, 1308 states have (on average 1.385321100917431) internal successors, (1812), 1317 states have internal predecessors, (1812), 212 states have call successors, (212), 104 states have call predecessors, (212), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2023-11-23 20:34:58,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1625 states to 1625 states and 2236 transitions. [2023-11-23 20:34:58,123 INFO L78 Accepts]: Start accepts. Automaton has 1625 states and 2236 transitions. Word has length 108 [2023-11-23 20:34:58,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:58,124 INFO L495 AbstractCegarLoop]: Abstraction has 1625 states and 2236 transitions. [2023-11-23 20:34:58,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:34:58,125 INFO L276 IsEmpty]: Start isEmpty. Operand 1625 states and 2236 transitions. [2023-11-23 20:34:58,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-23 20:34:58,130 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:58,130 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:34:58,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-23 20:34:58,131 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:58,131 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:58,132 INFO L85 PathProgramCache]: Analyzing trace with hash 1856027295, now seen corresponding path program 1 times [2023-11-23 20:34:58,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:58,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581317883] [2023-11-23 20:34:58,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:58,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:58,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:58,246 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-11-23 20:34:58,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:58,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581317883] [2023-11-23 20:34:58,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581317883] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:58,247 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:34:58,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:34:58,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507414063] [2023-11-23 20:34:58,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:58,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:58,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:58,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:58,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:34:58,250 INFO L87 Difference]: Start difference. First operand 1625 states and 2236 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:34:58,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:58,552 INFO L93 Difference]: Finished difference Result 4790 states and 6649 transitions. [2023-11-23 20:34:58,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:58,553 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 108 [2023-11-23 20:34:58,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:58,574 INFO L225 Difference]: With dead ends: 4790 [2023-11-23 20:34:58,574 INFO L226 Difference]: Without dead ends: 3171 [2023-11-23 20:34:58,582 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 20:34:58,582 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 114 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:58,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 246 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:58,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3171 states. [2023-11-23 20:34:58,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3171 to 3145. [2023-11-23 20:34:58,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3145 states, 2532 states have (on average 1.3665086887835702) internal successors, (3460), 2549 states have internal predecessors, (3460), 404 states have call successors, (404), 208 states have call predecessors, (404), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2023-11-23 20:34:58,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3145 states to 3145 states and 4268 transitions. [2023-11-23 20:34:58,861 INFO L78 Accepts]: Start accepts. Automaton has 3145 states and 4268 transitions. Word has length 108 [2023-11-23 20:34:58,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:58,862 INFO L495 AbstractCegarLoop]: Abstraction has 3145 states and 4268 transitions. [2023-11-23 20:34:58,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:34:58,862 INFO L276 IsEmpty]: Start isEmpty. Operand 3145 states and 4268 transitions. [2023-11-23 20:34:58,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:34:58,873 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:58,873 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:58,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-23 20:34:58,874 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:58,874 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:58,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1774939735, now seen corresponding path program 1 times [2023-11-23 20:34:58,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:58,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697385882] [2023-11-23 20:34:58,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:58,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:58,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:58,998 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 20:34:58,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:58,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697385882] [2023-11-23 20:34:58,999 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697385882] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:58,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819085531] [2023-11-23 20:34:58,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:58,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:58,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:59,000 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:59,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:34:59,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:59,166 INFO L262 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:34:59,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:59,200 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:34:59,200 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:59,200 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819085531] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:59,200 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:34:59,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:34:59,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047256020] [2023-11-23 20:34:59,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:59,201 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:34:59,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:59,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:34:59,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:59,203 INFO L87 Difference]: Start difference. First operand 3145 states and 4268 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:34:59,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:59,582 INFO L93 Difference]: Finished difference Result 5837 states and 8022 transitions. [2023-11-23 20:34:59,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:34:59,583 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-11-23 20:34:59,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:59,609 INFO L225 Difference]: With dead ends: 5837 [2023-11-23 20:34:59,609 INFO L226 Difference]: Without dead ends: 4219 [2023-11-23 20:34:59,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:34:59,615 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 72 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 307 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:59,616 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 307 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:59,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4219 states. [2023-11-23 20:34:59,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4219 to 3777. [2023-11-23 20:34:59,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3777 states, 3116 states have (on average 1.392811296534018) internal successors, (4340), 3133 states have internal predecessors, (4340), 428 states have call successors, (428), 232 states have call predecessors, (428), 232 states have return successors, (428), 412 states have call predecessors, (428), 428 states have call successors, (428) [2023-11-23 20:34:59,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3777 states to 3777 states and 5196 transitions. [2023-11-23 20:34:59,965 INFO L78 Accepts]: Start accepts. Automaton has 3777 states and 5196 transitions. Word has length 123 [2023-11-23 20:34:59,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:59,965 INFO L495 AbstractCegarLoop]: Abstraction has 3777 states and 5196 transitions. [2023-11-23 20:34:59,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:34:59,965 INFO L276 IsEmpty]: Start isEmpty. Operand 3777 states and 5196 transitions. [2023-11-23 20:34:59,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:34:59,981 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:59,981 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:35:00,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:00,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-23 20:35:00,203 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:00,203 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:00,203 INFO L85 PathProgramCache]: Analyzing trace with hash -1532852784, now seen corresponding path program 1 times [2023-11-23 20:35:00,203 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:00,203 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044908628] [2023-11-23 20:35:00,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:00,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:00,368 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-23 20:35:00,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:00,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044908628] [2023-11-23 20:35:00,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044908628] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:00,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211169538] [2023-11-23 20:35:00,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:00,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:00,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:00,370 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:00,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:35:00,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:00,536 INFO L262 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:35:00,540 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:00,563 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:35:00,564 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:00,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211169538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:00,564 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:00,564 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:35:00,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404358921] [2023-11-23 20:35:00,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:00,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:00,565 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:00,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:00,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:00,566 INFO L87 Difference]: Start difference. First operand 3777 states and 5196 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:01,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:01,039 INFO L93 Difference]: Finished difference Result 7097 states and 9842 transitions. [2023-11-23 20:35:01,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:01,040 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-11-23 20:35:01,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:01,071 INFO L225 Difference]: With dead ends: 7097 [2023-11-23 20:35:01,071 INFO L226 Difference]: Without dead ends: 5169 [2023-11-23 20:35:01,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:01,078 INFO L413 NwaCegarLoop]: 201 mSDtfsCounter, 78 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:01,078 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 326 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:01,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5169 states. [2023-11-23 20:35:01,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5169 to 4671. [2023-11-23 20:35:01,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4671 states, 3938 states have (on average 1.409852717115287) internal successors, (5552), 3955 states have internal predecessors, (5552), 464 states have call successors, (464), 268 states have call predecessors, (464), 268 states have return successors, (464), 448 states have call predecessors, (464), 464 states have call successors, (464) [2023-11-23 20:35:01,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4671 states to 4671 states and 6480 transitions. [2023-11-23 20:35:01,473 INFO L78 Accepts]: Start accepts. Automaton has 4671 states and 6480 transitions. Word has length 123 [2023-11-23 20:35:01,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:01,473 INFO L495 AbstractCegarLoop]: Abstraction has 4671 states and 6480 transitions. [2023-11-23 20:35:01,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:01,474 INFO L276 IsEmpty]: Start isEmpty. Operand 4671 states and 6480 transitions. [2023-11-23 20:35:01,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:35:01,489 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:01,490 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:01,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:01,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:01,704 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:01,704 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:01,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1590582495, now seen corresponding path program 1 times [2023-11-23 20:35:01,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:01,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402007345] [2023-11-23 20:35:01,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:01,705 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:01,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:01,838 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 20:35:01,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:01,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402007345] [2023-11-23 20:35:01,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402007345] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:01,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409889133] [2023-11-23 20:35:01,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:01,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:01,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:01,841 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:01,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:35:02,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:02,008 INFO L262 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:35:02,011 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:35:02,034 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:02,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409889133] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:02,035 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:02,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:35:02,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796182247] [2023-11-23 20:35:02,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:02,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:02,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:02,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:02,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:02,038 INFO L87 Difference]: Start difference. First operand 4671 states and 6480 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:02,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:02,532 INFO L93 Difference]: Finished difference Result 8941 states and 12500 transitions. [2023-11-23 20:35:02,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:02,533 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-11-23 20:35:02,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:02,571 INFO L225 Difference]: With dead ends: 8941 [2023-11-23 20:35:02,572 INFO L226 Difference]: Without dead ends: 6530 [2023-11-23 20:35:02,579 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:02,579 INFO L413 NwaCegarLoop]: 206 mSDtfsCounter, 84 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 331 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:02,580 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 331 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:02,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6530 states. [2023-11-23 20:35:03,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6530 to 5976. [2023-11-23 20:35:03,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5976 states, 5135 states have (on average 1.4212268743914314) internal successors, (7298), 5152 states have internal predecessors, (7298), 518 states have call successors, (518), 322 states have call predecessors, (518), 322 states have return successors, (518), 502 states have call predecessors, (518), 518 states have call successors, (518) [2023-11-23 20:35:03,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5976 states to 5976 states and 8334 transitions. [2023-11-23 20:35:03,095 INFO L78 Accepts]: Start accepts. Automaton has 5976 states and 8334 transitions. Word has length 123 [2023-11-23 20:35:03,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:03,095 INFO L495 AbstractCegarLoop]: Abstraction has 5976 states and 8334 transitions. [2023-11-23 20:35:03,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:03,097 INFO L276 IsEmpty]: Start isEmpty. Operand 5976 states and 8334 transitions. [2023-11-23 20:35:03,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:35:03,115 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:03,116 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:35:03,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:03,331 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-23 20:35:03,332 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:03,332 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:03,332 INFO L85 PathProgramCache]: Analyzing trace with hash -1259853262, now seen corresponding path program 1 times [2023-11-23 20:35:03,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:03,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502082582] [2023-11-23 20:35:03,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:03,333 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:03,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:03,493 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2023-11-23 20:35:03,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:03,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502082582] [2023-11-23 20:35:03,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502082582] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:03,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512713715] [2023-11-23 20:35:03,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:03,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:03,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:03,500 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:03,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:35:03,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:03,673 INFO L262 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:35:03,676 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:03,724 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 20:35:03,724 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:03,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512713715] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:03,725 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:03,725 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:35:03,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592830164] [2023-11-23 20:35:03,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:03,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:03,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:03,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:03,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:03,730 INFO L87 Difference]: Start difference. First operand 5976 states and 8334 transitions. Second operand has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:04,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:04,186 INFO L93 Difference]: Finished difference Result 9740 states and 13539 transitions. [2023-11-23 20:35:04,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:04,187 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-11-23 20:35:04,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:04,229 INFO L225 Difference]: With dead ends: 9740 [2023-11-23 20:35:04,230 INFO L226 Difference]: Without dead ends: 6690 [2023-11-23 20:35:04,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:04,240 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 112 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:04,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 165 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:35:04,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6690 states. [2023-11-23 20:35:04,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6690 to 6690. [2023-11-23 20:35:04,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6690 states, 5757 states have (on average 1.3979503213479243) internal successors, (8048), 5774 states have internal predecessors, (8048), 548 states have call successors, (548), 384 states have call predecessors, (548), 384 states have return successors, (548), 532 states have call predecessors, (548), 548 states have call successors, (548) [2023-11-23 20:35:04,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6690 states to 6690 states and 9144 transitions. [2023-11-23 20:35:04,889 INFO L78 Accepts]: Start accepts. Automaton has 6690 states and 9144 transitions. Word has length 123 [2023-11-23 20:35:04,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:04,889 INFO L495 AbstractCegarLoop]: Abstraction has 6690 states and 9144 transitions. [2023-11-23 20:35:04,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.666666666666668) internal successors, (83), 3 states have internal predecessors, (83), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:04,890 INFO L276 IsEmpty]: Start isEmpty. Operand 6690 states and 9144 transitions. [2023-11-23 20:35:04,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:35:04,913 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:04,914 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:04,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:05,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:05,138 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:05,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:05,138 INFO L85 PathProgramCache]: Analyzing trace with hash 1458556275, now seen corresponding path program 1 times [2023-11-23 20:35:05,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:05,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343068536] [2023-11-23 20:35:05,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:05,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:05,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:05,273 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 24 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-11-23 20:35:05,273 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:05,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343068536] [2023-11-23 20:35:05,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343068536] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:05,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526858222] [2023-11-23 20:35:05,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:05,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:05,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:05,278 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:05,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:35:05,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:05,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:35:05,454 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:05,479 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:35:05,479 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:05,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526858222] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:05,479 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:05,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 20:35:05,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678625240] [2023-11-23 20:35:05,480 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:05,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:05,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:05,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:05,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:05,482 INFO L87 Difference]: Start difference. First operand 6690 states and 9144 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:06,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:06,134 INFO L93 Difference]: Finished difference Result 12480 states and 17171 transitions. [2023-11-23 20:35:06,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:06,135 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 123 [2023-11-23 20:35:06,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:06,167 INFO L225 Difference]: With dead ends: 12480 [2023-11-23 20:35:06,168 INFO L226 Difference]: Without dead ends: 9062 [2023-11-23 20:35:06,174 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:35:06,176 INFO L413 NwaCegarLoop]: 192 mSDtfsCounter, 66 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:06,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 318 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:06,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9062 states. [2023-11-23 20:35:06,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9062 to 8526. [2023-11-23 20:35:06,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8526 states, 7431 states have (on average 1.4027721706365226) internal successors, (10424), 7448 states have internal predecessors, (10424), 629 states have call successors, (629), 465 states have call predecessors, (629), 465 states have return successors, (629), 613 states have call predecessors, (629), 629 states have call successors, (629) [2023-11-23 20:35:06,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8526 states to 8526 states and 11682 transitions. [2023-11-23 20:35:06,803 INFO L78 Accepts]: Start accepts. Automaton has 8526 states and 11682 transitions. Word has length 123 [2023-11-23 20:35:06,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:06,803 INFO L495 AbstractCegarLoop]: Abstraction has 8526 states and 11682 transitions. [2023-11-23 20:35:06,804 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 20:35:06,804 INFO L276 IsEmpty]: Start isEmpty. Operand 8526 states and 11682 transitions. [2023-11-23 20:35:06,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:35:06,826 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:06,826 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:35:06,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:07,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:07,048 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:07,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:07,048 INFO L85 PathProgramCache]: Analyzing trace with hash 523050299, now seen corresponding path program 2 times [2023-11-23 20:35:07,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:07,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628462774] [2023-11-23 20:35:07,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:07,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:07,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:07,350 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 10 proven. 33 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 20:35:07,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:07,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628462774] [2023-11-23 20:35:07,351 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628462774] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:07,351 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1648843020] [2023-11-23 20:35:07,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 20:35:07,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:07,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:07,352 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:07,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 20:35:07,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 20:35:07,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:35:07,491 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:35:07,495 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:07,515 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 20:35:07,515 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:07,516 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1648843020] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:07,516 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:07,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:35:07,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798046577] [2023-11-23 20:35:07,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:07,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:07,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:07,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:07,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:35:07,517 INFO L87 Difference]: Start difference. First operand 8526 states and 11682 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 20:35:08,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:35:08,106 INFO L93 Difference]: Finished difference Result 13852 states and 19188 transitions. [2023-11-23 20:35:08,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:35:08,107 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 123 [2023-11-23 20:35:08,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:35:08,130 INFO L225 Difference]: With dead ends: 13852 [2023-11-23 20:35:08,131 INFO L226 Difference]: Without dead ends: 8544 [2023-11-23 20:35:08,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:35:08,142 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 122 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:35:08,143 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 320 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:35:08,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8544 states. [2023-11-23 20:35:08,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8544 to 8396. [2023-11-23 20:35:08,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8396 states, 7301 states have (on average 1.3833721408026298) internal successors, (10100), 7318 states have internal predecessors, (10100), 629 states have call successors, (629), 465 states have call predecessors, (629), 465 states have return successors, (629), 613 states have call predecessors, (629), 629 states have call successors, (629) [2023-11-23 20:35:08,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8396 states to 8396 states and 11358 transitions. [2023-11-23 20:35:08,856 INFO L78 Accepts]: Start accepts. Automaton has 8396 states and 11358 transitions. Word has length 123 [2023-11-23 20:35:08,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:35:08,857 INFO L495 AbstractCegarLoop]: Abstraction has 8396 states and 11358 transitions. [2023-11-23 20:35:08,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 20:35:08,857 INFO L276 IsEmpty]: Start isEmpty. Operand 8396 states and 11358 transitions. [2023-11-23 20:35:08,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-11-23 20:35:08,876 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:35:08,876 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 20:35:08,897 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 20:35:09,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-11-23 20:35:09,092 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, error1Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:35:09,092 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:35:09,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1658594917, now seen corresponding path program 1 times [2023-11-23 20:35:09,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:35:09,092 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693680513] [2023-11-23 20:35:09,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:09,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:35:09,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:09,402 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-23 20:35:09,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:35:09,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693680513] [2023-11-23 20:35:09,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693680513] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:35:09,402 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794544961] [2023-11-23 20:35:09,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:35:09,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:35:09,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:35:09,404 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:35:09,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_80729715-c171-4539-be8b-5974fe0196f6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 20:35:09,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:35:09,576 INFO L262 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 20:35:09,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:35:09,607 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 20:35:09,607 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:35:09,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794544961] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:35:09,608 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:35:09,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 20:35:09,608 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706024980] [2023-11-23 20:35:09,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:35:09,609 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:35:09,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:35:09,609 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:35:09,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:35:09,610 INFO L87 Difference]: Start difference. First operand 8396 states and 11358 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 3 states have internal predecessors, (85), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10)