./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/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_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/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_c048c010-36e1-43a7-b613-242c191980e9/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 d5746a53d1ab0f7d20d2e5362b7235e80167d7cee80ddadf160c57caf25829fe --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:14:58,458 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:14:58,569 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:14:58,585 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:14:58,599 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:14:58,659 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:14:58,661 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:14:58,661 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:14:58,662 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:14:58,671 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:14:58,671 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:14:58,672 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:14:58,673 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:14:58,673 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:14:58,674 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:14:58,674 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:14:58,675 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:14:58,675 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:14:58,676 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:14:58,676 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:14:58,677 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:14:58,677 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:14:58,678 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:14:58,679 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:14:58,679 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:14:58,679 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:14:58,680 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:14:58,680 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:14:58,681 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:14:58,681 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:14:58,682 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:14:58,682 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:14:58,682 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:14:58,683 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:14:58,683 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:14:58,683 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:14:58,683 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:14:58,684 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:14:58,684 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:14:58,684 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:14:58,685 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:14:58,685 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:14:58,685 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:14:58,686 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:14:58,686 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:14:58,686 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:14:58,686 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:14:58,687 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_c048c010-36e1-43a7-b613-242c191980e9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d5746a53d1ab0f7d20d2e5362b7235e80167d7cee80ddadf160c57caf25829fe [2023-11-23 21:14:58,971 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:14:59,006 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:14:59,009 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:14:59,011 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:14:59,012 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:14:59,013 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-23 21:15:02,299 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:15:02,529 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:15:02,529 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-23 21:15:02,545 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/data/9f2158dc5/f097449b41624a899f3d7e4220cbbc6d/FLAGcc981a3fc [2023-11-23 21:15:02,558 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/data/9f2158dc5/f097449b41624a899f3d7e4220cbbc6d [2023-11-23 21:15:02,561 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:15:02,563 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:15:02,564 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:15:02,564 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:15:02,570 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:15:02,571 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:15:02" (1/1) ... [2023-11-23 21:15:02,572 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@610f8c92 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:02, skipping insertion in model container [2023-11-23 21:15:02,573 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:15:02" (1/1) ... [2023-11-23 21:15:02,639 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:15:02,800 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_c048c010-36e1-43a7-b613-242c191980e9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[913,926] [2023-11-23 21:15:02,867 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_c048c010-36e1-43a7-b613-242c191980e9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[5977,5990] [2023-11-23 21:15:02,959 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:15:02,977 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:15:02,995 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_c048c010-36e1-43a7-b613-242c191980e9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[913,926] [2023-11-23 21:15:03,030 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_c048c010-36e1-43a7-b613-242c191980e9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.03.cil-1.c[5977,5990] [2023-11-23 21:15:03,092 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:15:03,121 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:15:03,121 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03 WrapperNode [2023-11-23 21:15:03,122 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:15:03,123 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:15:03,123 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:15:03,124 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:15:03,132 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,160 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,201 INFO L138 Inliner]: procedures = 54, calls = 58, calls flagged for inlining = 28, calls inlined = 28, statements flattened = 551 [2023-11-23 21:15:03,206 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:15:03,212 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:15:03,212 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:15:03,212 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:15:03,221 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,222 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,226 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,227 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,239 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,249 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,252 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,255 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,260 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:15:03,261 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:15:03,261 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:15:03,262 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:15:03,262 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (1/1) ... [2023-11-23 21:15:03,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:15:03,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:03,297 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:15:03,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:15:03,355 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:15:03,357 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 21:15:03,358 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 21:15:03,358 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2023-11-23 21:15:03,358 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2023-11-23 21:15:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2023-11-23 21:15:03,359 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2023-11-23 21:15:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2023-11-23 21:15:03,359 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2023-11-23 21:15:03,359 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2023-11-23 21:15:03,360 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2023-11-23 21:15:03,360 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2023-11-23 21:15:03,360 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2023-11-23 21:15:03,360 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2023-11-23 21:15:03,361 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2023-11-23 21:15:03,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:15:03,362 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2023-11-23 21:15:03,362 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2023-11-23 21:15:03,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:15:03,363 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:15:03,364 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2023-11-23 21:15:03,365 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2023-11-23 21:15:03,365 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2023-11-23 21:15:03,365 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2023-11-23 21:15:03,514 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:15:03,517 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:15:04,131 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:15:04,366 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:15:04,367 INFO L309 CfgBuilder]: Removed 10 assume(true) statements. [2023-11-23 21:15:04,369 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:15:04 BoogieIcfgContainer [2023-11-23 21:15:04,369 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:15:04,373 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:15:04,374 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:15:04,377 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:15:04,377 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:15:02" (1/3) ... [2023-11-23 21:15:04,378 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fa25881 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:15:04, skipping insertion in model container [2023-11-23 21:15:04,378 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:15:03" (2/3) ... [2023-11-23 21:15:04,380 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fa25881 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:15:04, skipping insertion in model container [2023-11-23 21:15:04,380 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:15:04" (3/3) ... [2023-11-23 21:15:04,382 INFO L112 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.03.cil-1.c [2023-11-23 21:15:04,401 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:15:04,401 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 21:15:04,459 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:15:04,467 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;@246b717d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:15:04,468 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 21:15:04,474 INFO L276 IsEmpty]: Start isEmpty. Operand has 150 states, 112 states have (on average 1.5267857142857142) internal successors, (171), 119 states have internal predecessors, (171), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2023-11-23 21:15:04,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 21:15:04,489 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:04,490 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 21:15:04,491 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:04,498 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:04,498 INFO L85 PathProgramCache]: Analyzing trace with hash 2103337863, now seen corresponding path program 1 times [2023-11-23 21:15:04,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:04,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232032913] [2023-11-23 21:15:04,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:04,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:04,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:04,841 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:15:04,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:04,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232032913] [2023-11-23 21:15:04,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232032913] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:04,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:04,843 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:04,844 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702436874] [2023-11-23 21:15:04,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:04,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:04,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:04,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:04,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:04,891 INFO L87 Difference]: Start difference. First operand has 150 states, 112 states have (on average 1.5267857142857142) internal successors, (171), 119 states have internal predecessors, (171), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) 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 21:15:05,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:05,122 INFO L93 Difference]: Finished difference Result 332 states and 490 transitions. [2023-11-23 21:15:05,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:05,126 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 21:15:05,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:05,136 INFO L225 Difference]: With dead ends: 332 [2023-11-23 21:15:05,136 INFO L226 Difference]: Without dead ends: 182 [2023-11-23 21:15:05,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:05,144 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 186 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:05,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 241 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:05,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-11-23 21:15:05,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 178. [2023-11-23 21:15:05,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 138 states have (on average 1.434782608695652) internal successors, (198), 142 states have internal predecessors, (198), 28 states have call successors, (28), 12 states have call predecessors, (28), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-23 21:15:05,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 250 transitions. [2023-11-23 21:15:05,208 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 250 transitions. Word has length 28 [2023-11-23 21:15:05,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:05,209 INFO L495 AbstractCegarLoop]: Abstraction has 178 states and 250 transitions. [2023-11-23 21:15:05,209 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 21:15:05,210 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 250 transitions. [2023-11-23 21:15:05,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:15:05,213 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:05,213 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 21:15:05,213 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:15:05,214 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:05,214 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:05,215 INFO L85 PathProgramCache]: Analyzing trace with hash -2052906385, now seen corresponding path program 1 times [2023-11-23 21:15:05,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:05,215 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166525768] [2023-11-23 21:15:05,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:05,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:05,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:05,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:15:05,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:05,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166525768] [2023-11-23 21:15:05,297 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166525768] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:05,297 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:05,297 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:05,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160934404] [2023-11-23 21:15:05,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:05,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:05,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:05,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:05,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:05,300 INFO L87 Difference]: Start difference. First operand 178 states and 250 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 21:15:05,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:05,387 INFO L93 Difference]: Finished difference Result 334 states and 467 transitions. [2023-11-23 21:15:05,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:05,388 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 21:15:05,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:05,391 INFO L225 Difference]: With dead ends: 334 [2023-11-23 21:15:05,392 INFO L226 Difference]: Without dead ends: 253 [2023-11-23 21:15:05,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:05,395 INFO L413 NwaCegarLoop]: 172 mSDtfsCounter, 184 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:05,395 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 225 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:05,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2023-11-23 21:15:05,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 249. [2023-11-23 21:15:05,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 198 states have (on average 1.4090909090909092) internal successors, (279), 202 states have internal predecessors, (279), 35 states have call successors, (35), 16 states have call predecessors, (35), 14 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-11-23 21:15:05,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 345 transitions. [2023-11-23 21:15:05,429 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 345 transitions. Word has length 29 [2023-11-23 21:15:05,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:05,429 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 345 transitions. [2023-11-23 21:15:05,430 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 21:15:05,430 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 345 transitions. [2023-11-23 21:15:05,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 21:15:05,433 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:05,434 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 21:15:05,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:15:05,434 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:05,435 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:05,435 INFO L85 PathProgramCache]: Analyzing trace with hash 1520943503, now seen corresponding path program 1 times [2023-11-23 21:15:05,435 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:05,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299945179] [2023-11-23 21:15:05,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:05,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:05,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:05,535 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:15:05,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:05,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299945179] [2023-11-23 21:15:05,538 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299945179] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:05,540 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:05,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:05,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20494217] [2023-11-23 21:15:05,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:05,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:05,547 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:05,548 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:05,548 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:05,549 INFO L87 Difference]: Start difference. First operand 249 states and 345 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 21:15:05,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:05,682 INFO L93 Difference]: Finished difference Result 489 states and 673 transitions. [2023-11-23 21:15:05,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:05,683 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 21:15:05,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:05,690 INFO L225 Difference]: With dead ends: 489 [2023-11-23 21:15:05,690 INFO L226 Difference]: Without dead ends: 337 [2023-11-23 21:15:05,701 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:05,703 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 46 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:05,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 341 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:05,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2023-11-23 21:15:05,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 323. [2023-11-23 21:15:05,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 261 states have (on average 1.3946360153256705) internal successors, (364), 267 states have internal predecessors, (364), 41 states have call successors, (41), 21 states have call predecessors, (41), 19 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2023-11-23 21:15:05,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 442 transitions. [2023-11-23 21:15:05,779 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 442 transitions. Word has length 30 [2023-11-23 21:15:05,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:05,779 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 442 transitions. [2023-11-23 21:15:05,780 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 21:15:05,780 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 442 transitions. [2023-11-23 21:15:05,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-11-23 21:15:05,789 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:05,789 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] [2023-11-23 21:15:05,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:15:05,790 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:05,791 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:05,791 INFO L85 PathProgramCache]: Analyzing trace with hash -1376873717, now seen corresponding path program 1 times [2023-11-23 21:15:05,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:05,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203081830] [2023-11-23 21:15:05,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:05,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:05,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:05,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:15:05,989 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:05,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203081830] [2023-11-23 21:15:05,989 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203081830] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:05,989 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:05,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:15:05,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629361056] [2023-11-23 21:15:05,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:05,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:05,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:05,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:05,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:15:05,992 INFO L87 Difference]: Start difference. First operand 323 states and 442 transitions. Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:15:06,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:06,283 INFO L93 Difference]: Finished difference Result 493 states and 695 transitions. [2023-11-23 21:15:06,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:06,284 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 41 [2023-11-23 21:15:06,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:06,288 INFO L225 Difference]: With dead ends: 493 [2023-11-23 21:15:06,289 INFO L226 Difference]: Without dead ends: 402 [2023-11-23 21:15:06,292 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 21:15:06,300 INFO L413 NwaCegarLoop]: 256 mSDtfsCounter, 289 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:06,301 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 438 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:15:06,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2023-11-23 21:15:06,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 401. [2023-11-23 21:15:06,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 320 states have (on average 1.38125) internal successors, (442), 327 states have internal predecessors, (442), 54 states have call successors, (54), 27 states have call predecessors, (54), 25 states have return successors, (50), 47 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-23 21:15:06,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 546 transitions. [2023-11-23 21:15:06,357 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 546 transitions. Word has length 41 [2023-11-23 21:15:06,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:06,358 INFO L495 AbstractCegarLoop]: Abstraction has 401 states and 546 transitions. [2023-11-23 21:15:06,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 4 states have internal predecessors, (30), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 21:15:06,359 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 546 transitions. [2023-11-23 21:15:06,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 21:15:06,361 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:06,361 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 21:15:06,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:15:06,362 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:06,362 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:06,362 INFO L85 PathProgramCache]: Analyzing trace with hash -520417281, now seen corresponding path program 1 times [2023-11-23 21:15:06,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:06,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741413744] [2023-11-23 21:15:06,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:06,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:06,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:06,462 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 21:15:06,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:06,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741413744] [2023-11-23 21:15:06,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741413744] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:06,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:06,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:06,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011011342] [2023-11-23 21:15:06,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:06,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:06,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:06,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:06,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:06,465 INFO L87 Difference]: Start difference. First operand 401 states and 546 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 21:15:06,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:06,563 INFO L93 Difference]: Finished difference Result 564 states and 764 transitions. [2023-11-23 21:15:06,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:06,564 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 21:15:06,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:06,567 INFO L225 Difference]: With dead ends: 564 [2023-11-23 21:15:06,567 INFO L226 Difference]: Without dead ends: 406 [2023-11-23 21:15:06,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:06,569 INFO L413 NwaCegarLoop]: 204 mSDtfsCounter, 32 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:06,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 373 Invalid, 68 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:06,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2023-11-23 21:15:06,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 395. [2023-11-23 21:15:06,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 314 states have (on average 1.3630573248407643) internal successors, (428), 321 states have internal predecessors, (428), 54 states have call successors, (54), 27 states have call predecessors, (54), 25 states have return successors, (50), 47 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-23 21:15:06,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 532 transitions. [2023-11-23 21:15:06,603 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 532 transitions. Word has length 43 [2023-11-23 21:15:06,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:06,604 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 532 transitions. [2023-11-23 21:15:06,604 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 21:15:06,604 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 532 transitions. [2023-11-23 21:15:06,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-23 21:15:06,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:06,606 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 21:15:06,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:15:06,606 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:06,607 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:06,607 INFO L85 PathProgramCache]: Analyzing trace with hash 1243700047, now seen corresponding path program 1 times [2023-11-23 21:15:06,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:06,607 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819361648] [2023-11-23 21:15:06,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:06,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:06,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:06,649 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 21:15:06,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:06,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819361648] [2023-11-23 21:15:06,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819361648] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:06,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:06,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:06,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517913420] [2023-11-23 21:15:06,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:06,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:06,651 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:06,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:06,651 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:06,652 INFO L87 Difference]: Start difference. First operand 395 states and 532 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 21:15:06,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:06,751 INFO L93 Difference]: Finished difference Result 644 states and 856 transitions. [2023-11-23 21:15:06,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:06,752 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 21:15:06,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:06,755 INFO L225 Difference]: With dead ends: 644 [2023-11-23 21:15:06,755 INFO L226 Difference]: Without dead ends: 441 [2023-11-23 21:15:06,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:06,757 INFO L413 NwaCegarLoop]: 171 mSDtfsCounter, 169 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:06,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 223 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:06,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2023-11-23 21:15:06,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 441. [2023-11-23 21:15:06,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 353 states have (on average 1.3342776203966005) internal successors, (471), 360 states have internal predecessors, (471), 58 states have call successors, (58), 30 states have call predecessors, (58), 28 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-23 21:15:06,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 583 transitions. [2023-11-23 21:15:06,809 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 583 transitions. Word has length 46 [2023-11-23 21:15:06,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:06,809 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 583 transitions. [2023-11-23 21:15:06,809 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 21:15:06,810 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 583 transitions. [2023-11-23 21:15:06,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-23 21:15:06,811 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:06,811 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 21:15:06,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:15:06,812 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:06,812 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:06,812 INFO L85 PathProgramCache]: Analyzing trace with hash -608820875, now seen corresponding path program 1 times [2023-11-23 21:15:06,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:06,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866258471] [2023-11-23 21:15:06,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:06,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:06,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:06,899 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:15:06,899 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:06,899 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866258471] [2023-11-23 21:15:06,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866258471] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:06,900 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:06,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:15:06,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633144518] [2023-11-23 21:15:06,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:06,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:06,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:06,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:06,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:15:06,902 INFO L87 Difference]: Start difference. First operand 441 states and 583 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 21:15:07,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:07,109 INFO L93 Difference]: Finished difference Result 481 states and 630 transitions. [2023-11-23 21:15:07,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:07,109 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 21:15:07,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:07,113 INFO L225 Difference]: With dead ends: 481 [2023-11-23 21:15:07,113 INFO L226 Difference]: Without dead ends: 478 [2023-11-23 21:15:07,114 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 21:15:07,114 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 314 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:07,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 222 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:07,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2023-11-23 21:15:07,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 440. [2023-11-23 21:15:07,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 353 states have (on average 1.3286118980169972) internal successors, (469), 359 states have internal predecessors, (469), 57 states have call successors, (57), 30 states have call predecessors, (57), 28 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2023-11-23 21:15:07,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 580 transitions. [2023-11-23 21:15:07,170 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 580 transitions. Word has length 47 [2023-11-23 21:15:07,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:07,171 INFO L495 AbstractCegarLoop]: Abstraction has 440 states and 580 transitions. [2023-11-23 21:15:07,172 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 21:15:07,172 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 580 transitions. [2023-11-23 21:15:07,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-23 21:15:07,173 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:07,174 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 21:15:07,174 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 21:15:07,174 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:07,174 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:07,175 INFO L85 PathProgramCache]: Analyzing trace with hash -1694342318, now seen corresponding path program 1 times [2023-11-23 21:15:07,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:07,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454891905] [2023-11-23 21:15:07,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:07,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:07,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:07,327 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 21:15:07,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:07,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454891905] [2023-11-23 21:15:07,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454891905] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:07,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [901232162] [2023-11-23 21:15:07,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:07,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:07,328 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:07,330 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:07,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:15:07,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:07,470 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 21:15:07,477 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:07,702 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 21:15:07,702 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:15:07,774 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 21:15:07,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [901232162] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:15:07,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503012956] [2023-11-23 21:15:07,795 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2023-11-23 21:15:07,796 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:15:07,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:15:07,806 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:15:07,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:15:13,061 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 99 for LOIs [2023-11-23 21:15:13,099 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 116 for LOIs [2023-11-23 21:15:13,157 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 162 for LOIs [2023-11-23 21:15:15,811 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:15:34,594 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7876#(and (<= 0 (+ ~c_last_read~0 2147483648)) (<= 1 |#StackHeapBarrier|) (= ~t1_pc~0 0) (<= ~q_buf_0~0 2147483647) (not (= ~p_num_write~0 1)) (= ~T1_E~0 2) (= ~m_st~0 0) (= ~q_free~0 1) (<= 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) (= ~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) (= ~c_last_read~0 ~q_buf_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) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= ~a_t~0 0) (= 0 ~t2_st~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (= ~t1_i~0 0))' at error location [2023-11-23 21:15:34,594 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:15:34,595 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:15:34,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2023-11-23 21:15:34,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494106565] [2023-11-23 21:15:34,595 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:15:34,596 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:15:34,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:34,597 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:15:34,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 21:15:34,599 INFO L87 Difference]: Start difference. First operand 440 states and 580 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 21:15:35,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:35,031 INFO L93 Difference]: Finished difference Result 883 states and 1148 transitions. [2023-11-23 21:15:35,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:15:35,033 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 21:15:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:35,043 INFO L225 Difference]: With dead ends: 883 [2023-11-23 21:15:35,044 INFO L226 Difference]: Without dead ends: 880 [2023-11-23 21:15:35,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 18.8s TimeCoverageRelationStatistics Valid=117, Invalid=1073, Unknown=0, NotChecked=0, Total=1190 [2023-11-23 21:15:35,047 INFO L413 NwaCegarLoop]: 227 mSDtfsCounter, 290 mSDsluCounter, 638 mSDsCounter, 0 mSdLazyCounter, 359 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 865 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:35,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [290 Valid, 865 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 359 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:15:35,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 880 states. [2023-11-23 21:15:35,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 880 to 649. [2023-11-23 21:15:35,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 649 states, 530 states have (on average 1.3245283018867924) internal successors, (702), 538 states have internal predecessors, (702), 76 states have call successors, (76), 43 states have call predecessors, (76), 41 states have return successors, (73), 68 states have call predecessors, (73), 73 states have call successors, (73) [2023-11-23 21:15:35,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 649 states to 649 states and 851 transitions. [2023-11-23 21:15:35,131 INFO L78 Accepts]: Start accepts. Automaton has 649 states and 851 transitions. Word has length 48 [2023-11-23 21:15:35,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:35,132 INFO L495 AbstractCegarLoop]: Abstraction has 649 states and 851 transitions. [2023-11-23 21:15:35,132 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 21:15:35,133 INFO L276 IsEmpty]: Start isEmpty. Operand 649 states and 851 transitions. [2023-11-23 21:15:35,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-23 21:15:35,135 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:35,136 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 21:15:35,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:35,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:35,369 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:35,370 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:35,370 INFO L85 PathProgramCache]: Analyzing trace with hash 1834398095, now seen corresponding path program 2 times [2023-11-23 21:15:35,370 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:35,370 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454414293] [2023-11-23 21:15:35,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:35,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:35,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:35,461 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 21:15:35,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:35,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454414293] [2023-11-23 21:15:35,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454414293] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:35,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:35,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:35,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658392670] [2023-11-23 21:15:35,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:35,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:35,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:35,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:35,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:35,465 INFO L87 Difference]: Start difference. First operand 649 states and 851 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 21:15:35,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:35,598 INFO L93 Difference]: Finished difference Result 979 states and 1284 transitions. [2023-11-23 21:15:35,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:35,599 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 21:15:35,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:35,604 INFO L225 Difference]: With dead ends: 979 [2023-11-23 21:15:35,605 INFO L226 Difference]: Without dead ends: 591 [2023-11-23 21:15:35,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:35,607 INFO L413 NwaCegarLoop]: 194 mSDtfsCounter, 182 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:35,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 239 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:35,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2023-11-23 21:15:35,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 582. [2023-11-23 21:15:35,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 582 states, 473 states have (on average 1.3128964059196617) internal successors, (621), 482 states have internal predecessors, (621), 70 states have call successors, (70), 39 states have call predecessors, (70), 37 states have return successors, (67), 61 states have call predecessors, (67), 67 states have call successors, (67) [2023-11-23 21:15:35,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 582 states to 582 states and 758 transitions. [2023-11-23 21:15:35,670 INFO L78 Accepts]: Start accepts. Automaton has 582 states and 758 transitions. Word has length 61 [2023-11-23 21:15:35,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:35,670 INFO L495 AbstractCegarLoop]: Abstraction has 582 states and 758 transitions. [2023-11-23 21:15:35,671 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 21:15:35,671 INFO L276 IsEmpty]: Start isEmpty. Operand 582 states and 758 transitions. [2023-11-23 21:15:35,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:15:35,674 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:35,674 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, 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 21:15:35,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 21:15:35,675 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:35,675 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:35,676 INFO L85 PathProgramCache]: Analyzing trace with hash 909197276, now seen corresponding path program 1 times [2023-11-23 21:15:35,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:35,676 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860672] [2023-11-23 21:15:35,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:35,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:35,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:35,800 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:15:35,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:35,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860672] [2023-11-23 21:15:35,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860672] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:35,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1575074722] [2023-11-23 21:15:35,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:35,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:35,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:35,802 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:35,819 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:15:35,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:35,960 INFO L262 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:35,970 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:36,008 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 21:15:36,009 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:36,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1575074722] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:36,009 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:36,010 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 21:15:36,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676341936] [2023-11-23 21:15:36,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:36,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:36,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:36,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:36,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:36,012 INFO L87 Difference]: Start difference. First operand 582 states and 758 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:15:36,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:36,162 INFO L93 Difference]: Finished difference Result 913 states and 1223 transitions. [2023-11-23 21:15:36,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:36,163 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 75 [2023-11-23 21:15:36,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:36,168 INFO L225 Difference]: With dead ends: 913 [2023-11-23 21:15:36,168 INFO L226 Difference]: Without dead ends: 744 [2023-11-23 21:15:36,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 75 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 21:15:36,170 INFO L413 NwaCegarLoop]: 209 mSDtfsCounter, 175 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:36,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 310 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:36,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2023-11-23 21:15:36,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 738. [2023-11-23 21:15:36,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 738 states, 593 states have (on average 1.3220910623946036) internal successors, (784), 603 states have internal predecessors, (784), 94 states have call successors, (94), 51 states have call predecessors, (94), 49 states have return successors, (91), 84 states have call predecessors, (91), 91 states have call successors, (91) [2023-11-23 21:15:36,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 738 states to 738 states and 969 transitions. [2023-11-23 21:15:36,244 INFO L78 Accepts]: Start accepts. Automaton has 738 states and 969 transitions. Word has length 75 [2023-11-23 21:15:36,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:36,245 INFO L495 AbstractCegarLoop]: Abstraction has 738 states and 969 transitions. [2023-11-23 21:15:36,245 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 2 states have internal predecessors, (47), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:15:36,245 INFO L276 IsEmpty]: Start isEmpty. Operand 738 states and 969 transitions. [2023-11-23 21:15:36,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-23 21:15:36,249 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:36,250 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, 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 21:15:36,275 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:36,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:15:36,470 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:36,471 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:36,471 INFO L85 PathProgramCache]: Analyzing trace with hash -540889126, now seen corresponding path program 1 times [2023-11-23 21:15:36,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:36,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836242205] [2023-11-23 21:15:36,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:36,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:36,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:36,866 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:15:36,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:36,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836242205] [2023-11-23 21:15:36,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836242205] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:36,867 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:36,867 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:15:36,867 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658861444] [2023-11-23 21:15:36,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:36,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:15:36,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:36,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:15:36,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:36,869 INFO L87 Difference]: Start difference. First operand 738 states and 969 transitions. Second operand has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:15:37,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:37,344 INFO L93 Difference]: Finished difference Result 1412 states and 1891 transitions. [2023-11-23 21:15:37,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:15:37,345 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 75 [2023-11-23 21:15:37,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:37,355 INFO L225 Difference]: With dead ends: 1412 [2023-11-23 21:15:37,355 INFO L226 Difference]: Without dead ends: 1088 [2023-11-23 21:15:37,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:15:37,358 INFO L413 NwaCegarLoop]: 175 mSDtfsCounter, 378 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:37,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [394 Valid, 441 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:15:37,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1088 states. [2023-11-23 21:15:37,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1088 to 1034. [2023-11-23 21:15:37,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1034 states, 819 states have (on average 1.326007326007326) internal successors, (1086), 831 states have internal predecessors, (1086), 140 states have call successors, (140), 75 states have call predecessors, (140), 73 states have return successors, (137), 128 states have call predecessors, (137), 137 states have call successors, (137) [2023-11-23 21:15:37,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1034 states to 1034 states and 1363 transitions. [2023-11-23 21:15:37,473 INFO L78 Accepts]: Start accepts. Automaton has 1034 states and 1363 transitions. Word has length 75 [2023-11-23 21:15:37,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:37,474 INFO L495 AbstractCegarLoop]: Abstraction has 1034 states and 1363 transitions. [2023-11-23 21:15:37,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.333333333333333) internal successors, (44), 6 states have internal predecessors, (44), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-23 21:15:37,474 INFO L276 IsEmpty]: Start isEmpty. Operand 1034 states and 1363 transitions. [2023-11-23 21:15:37,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-23 21:15:37,478 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:37,478 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 21:15:37,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-23 21:15:37,478 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:37,478 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:37,479 INFO L85 PathProgramCache]: Analyzing trace with hash -273338866, now seen corresponding path program 1 times [2023-11-23 21:15:37,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:37,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492687384] [2023-11-23 21:15:37,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:37,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:37,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:37,636 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 21:15:37,637 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:37,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492687384] [2023-11-23 21:15:37,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492687384] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:37,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303045346] [2023-11-23 21:15:37,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:37,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:37,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:37,639 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:37,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:15:37,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:37,774 INFO L262 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:37,778 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:37,802 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 21:15:37,802 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:37,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303045346] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:37,803 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:37,803 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:15:37,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576896376] [2023-11-23 21:15:37,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:37,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:37,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:37,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:37,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:37,805 INFO L87 Difference]: Start difference. First operand 1034 states and 1363 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 21:15:37,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:37,958 INFO L93 Difference]: Finished difference Result 1161 states and 1522 transitions. [2023-11-23 21:15:37,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:37,959 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 21:15:37,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:37,964 INFO L225 Difference]: With dead ends: 1161 [2023-11-23 21:15:37,964 INFO L226 Difference]: Without dead ends: 627 [2023-11-23 21:15:37,966 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 21:15:37,967 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 25 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 344 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 21:15:37,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 344 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:37,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2023-11-23 21:15:38,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 627. [2023-11-23 21:15:38,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 627 states, 476 states have (on average 1.3529411764705883) internal successors, (644), 482 states have internal predecessors, (644), 102 states have call successors, (102), 49 states have call predecessors, (102), 48 states have return successors, (100), 96 states have call predecessors, (100), 100 states have call successors, (100) [2023-11-23 21:15:38,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 627 states to 627 states and 846 transitions. [2023-11-23 21:15:38,042 INFO L78 Accepts]: Start accepts. Automaton has 627 states and 846 transitions. Word has length 73 [2023-11-23 21:15:38,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:38,042 INFO L495 AbstractCegarLoop]: Abstraction has 627 states and 846 transitions. [2023-11-23 21:15:38,042 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 21:15:38,042 INFO L276 IsEmpty]: Start isEmpty. Operand 627 states and 846 transitions. [2023-11-23 21:15:38,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2023-11-23 21:15:38,045 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:38,045 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, 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 21:15:38,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:38,259 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-23 21:15:38,259 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:38,259 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:38,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1000987594, now seen corresponding path program 1 times [2023-11-23 21:15:38,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:38,260 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856249386] [2023-11-23 21:15:38,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:38,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:38,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:38,485 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 10 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:15:38,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:38,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856249386] [2023-11-23 21:15:38,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856249386] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:38,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724285482] [2023-11-23 21:15:38,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:38,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:38,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:38,487 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:38,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:15:38,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:38,644 INFO L262 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:38,654 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:38,684 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:15:38,684 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:38,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724285482] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:38,685 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:38,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:38,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79386671] [2023-11-23 21:15:38,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:38,686 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:38,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:38,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:38,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:38,687 INFO L87 Difference]: Start difference. First operand 627 states and 846 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:15:38,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:38,831 INFO L93 Difference]: Finished difference Result 1117 states and 1519 transitions. [2023-11-23 21:15:38,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:38,832 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2023-11-23 21:15:38,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:38,838 INFO L225 Difference]: With dead ends: 1117 [2023-11-23 21:15:38,839 INFO L226 Difference]: Without dead ends: 789 [2023-11-23 21:15:38,840 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 91 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 21:15:38,841 INFO L413 NwaCegarLoop]: 164 mSDtfsCounter, 47 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:38,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 278 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:38,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 789 states. [2023-11-23 21:15:38,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 789 to 721. [2023-11-23 21:15:38,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 721 states, 562 states have (on average 1.3736654804270463) internal successors, (772), 568 states have internal predecessors, (772), 106 states have call successors, (106), 53 states have call predecessors, (106), 52 states have return successors, (104), 100 states have call predecessors, (104), 104 states have call successors, (104) [2023-11-23 21:15:38,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 721 states to 721 states and 982 transitions. [2023-11-23 21:15:38,926 INFO L78 Accepts]: Start accepts. Automaton has 721 states and 982 transitions. Word has length 89 [2023-11-23 21:15:38,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:38,927 INFO L495 AbstractCegarLoop]: Abstraction has 721 states and 982 transitions. [2023-11-23 21:15:38,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 21:15:38,927 INFO L276 IsEmpty]: Start isEmpty. Operand 721 states and 982 transitions. [2023-11-23 21:15:38,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 21:15:38,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:38,931 INFO L195 NwaCegarLoop]: trace histogram [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, 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, 1, 1, 1] [2023-11-23 21:15:38,960 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:39,145 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-23 21:15:39,146 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:39,146 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:39,146 INFO L85 PathProgramCache]: Analyzing trace with hash -914381917, now seen corresponding path program 1 times [2023-11-23 21:15:39,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:39,147 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995341407] [2023-11-23 21:15:39,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:39,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:39,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:39,466 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-23 21:15:39,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:39,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995341407] [2023-11-23 21:15:39,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995341407] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:39,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044370939] [2023-11-23 21:15:39,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:39,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:39,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:39,469 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:39,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:15:39,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:39,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:39,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:39,792 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-23 21:15:39,792 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:39,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044370939] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:39,793 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:39,793 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [6] total 7 [2023-11-23 21:15:39,793 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818273627] [2023-11-23 21:15:39,793 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:39,794 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:39,794 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:39,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:39,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:39,796 INFO L87 Difference]: Start difference. First operand 721 states and 982 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-23 21:15:40,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:40,020 INFO L93 Difference]: Finished difference Result 2126 states and 2927 transitions. [2023-11-23 21:15:40,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:40,021 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 113 [2023-11-23 21:15:40,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:40,033 INFO L225 Difference]: With dead ends: 2126 [2023-11-23 21:15:40,034 INFO L226 Difference]: Without dead ends: 1411 [2023-11-23 21:15:40,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 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 21:15:40,038 INFO L413 NwaCegarLoop]: 111 mSDtfsCounter, 70 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:40,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 212 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:40,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1411 states. [2023-11-23 21:15:40,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1411 to 1395. [2023-11-23 21:15:40,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1395 states, 1092 states have (on average 1.358974358974359) internal successors, (1484), 1102 states have internal predecessors, (1484), 198 states have call successors, (198), 105 states have call predecessors, (198), 104 states have return successors, (196), 188 states have call predecessors, (196), 196 states have call successors, (196) [2023-11-23 21:15:40,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1395 states to 1395 states and 1878 transitions. [2023-11-23 21:15:40,210 INFO L78 Accepts]: Start accepts. Automaton has 1395 states and 1878 transitions. Word has length 113 [2023-11-23 21:15:40,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:40,210 INFO L495 AbstractCegarLoop]: Abstraction has 1395 states and 1878 transitions. [2023-11-23 21:15:40,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 2 states have internal predecessors, (72), 2 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-23 21:15:40,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1395 states and 1878 transitions. [2023-11-23 21:15:40,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-23 21:15:40,217 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:40,217 INFO L195 NwaCegarLoop]: trace histogram [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 21:15:40,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:40,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:40,439 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:40,440 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:40,440 INFO L85 PathProgramCache]: Analyzing trace with hash -623291716, now seen corresponding path program 1 times [2023-11-23 21:15:40,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:40,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273372365] [2023-11-23 21:15:40,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:40,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:40,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:40,525 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-23 21:15:40,526 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:40,526 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273372365] [2023-11-23 21:15:40,526 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273372365] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:40,526 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:15:40,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:15:40,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563642799] [2023-11-23 21:15:40,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:40,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:40,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:40,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:40,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:40,529 INFO L87 Difference]: Start difference. First operand 1395 states and 1878 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:15:40,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:40,807 INFO L93 Difference]: Finished difference Result 3476 states and 4707 transitions. [2023-11-23 21:15:40,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:40,808 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 99 [2023-11-23 21:15:40,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:40,822 INFO L225 Difference]: With dead ends: 3476 [2023-11-23 21:15:40,822 INFO L226 Difference]: Without dead ends: 2087 [2023-11-23 21:15:40,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:15:40,829 INFO L413 NwaCegarLoop]: 152 mSDtfsCounter, 103 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 253 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:40,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 253 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:40,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2087 states. [2023-11-23 21:15:41,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2087 to 2071. [2023-11-23 21:15:41,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2071 states, 1624 states have (on average 1.3448275862068966) internal successors, (2184), 1638 states have internal predecessors, (2184), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-23 21:15:41,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2071 states to 2071 states and 2762 transitions. [2023-11-23 21:15:41,048 INFO L78 Accepts]: Start accepts. Automaton has 2071 states and 2762 transitions. Word has length 99 [2023-11-23 21:15:41,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:41,049 INFO L495 AbstractCegarLoop]: Abstraction has 2071 states and 2762 transitions. [2023-11-23 21:15:41,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 21:15:41,049 INFO L276 IsEmpty]: Start isEmpty. Operand 2071 states and 2762 transitions. [2023-11-23 21:15:41,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 21:15:41,058 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:41,058 INFO L195 NwaCegarLoop]: trace histogram [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, 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 21:15:41,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-23 21:15:41,058 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:41,059 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:41,059 INFO L85 PathProgramCache]: Analyzing trace with hash -1141395796, now seen corresponding path program 1 times [2023-11-23 21:15:41,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:41,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510403176] [2023-11-23 21:15:41,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:41,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:41,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:41,292 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:15:41,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:41,292 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510403176] [2023-11-23 21:15:41,293 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510403176] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:41,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760626857] [2023-11-23 21:15:41,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:41,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:41,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:41,294 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:41,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:15:41,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:41,462 INFO L262 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:15:41,465 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:41,496 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:15:41,497 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:41,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760626857] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:41,497 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:41,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:41,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182297409] [2023-11-23 21:15:41,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:41,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:41,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:41,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:41,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:41,500 INFO L87 Difference]: Start difference. First operand 2071 states and 2762 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:15:41,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:41,754 INFO L93 Difference]: Finished difference Result 3471 states and 4728 transitions. [2023-11-23 21:15:41,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:41,755 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 113 [2023-11-23 21:15:41,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:41,768 INFO L225 Difference]: With dead ends: 3471 [2023-11-23 21:15:41,769 INFO L226 Difference]: Without dead ends: 2083 [2023-11-23 21:15:41,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 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 21:15:41,775 INFO L413 NwaCegarLoop]: 166 mSDtfsCounter, 102 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:41,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 269 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:41,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2083 states. [2023-11-23 21:15:42,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2083 to 2063. [2023-11-23 21:15:42,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2063 states, 1616 states have (on average 1.3217821782178218) internal successors, (2136), 1630 states have internal predecessors, (2136), 290 states have call successors, (290), 157 states have call predecessors, (290), 156 states have return successors, (288), 276 states have call predecessors, (288), 288 states have call successors, (288) [2023-11-23 21:15:42,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2063 states to 2063 states and 2714 transitions. [2023-11-23 21:15:42,037 INFO L78 Accepts]: Start accepts. Automaton has 2063 states and 2714 transitions. Word has length 113 [2023-11-23 21:15:42,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:42,038 INFO L495 AbstractCegarLoop]: Abstraction has 2063 states and 2714 transitions. [2023-11-23 21:15:42,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 3 states have internal predecessors, (81), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:15:42,038 INFO L276 IsEmpty]: Start isEmpty. Operand 2063 states and 2714 transitions. [2023-11-23 21:15:42,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2023-11-23 21:15:42,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:42,047 INFO L195 NwaCegarLoop]: trace histogram [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, 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 21:15:42,076 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:42,271 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:42,271 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:42,272 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:42,272 INFO L85 PathProgramCache]: Analyzing trace with hash 23877068, now seen corresponding path program 1 times [2023-11-23 21:15:42,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:42,272 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703731455] [2023-11-23 21:15:42,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:42,272 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:42,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 10 proven. 25 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:15:42,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:42,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703731455] [2023-11-23 21:15:42,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1703731455] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:42,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847621048] [2023-11-23 21:15:42,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:42,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:42,508 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:42,509 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:42,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:15:42,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:42,662 INFO L262 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:42,667 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:42,692 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 21:15:42,692 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:42,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847621048] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:42,692 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:42,692 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:42,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126956892] [2023-11-23 21:15:42,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:42,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:42,694 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:42,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:42,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:42,695 INFO L87 Difference]: Start difference. First operand 2063 states and 2714 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:15:42,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:42,934 INFO L93 Difference]: Finished difference Result 3883 states and 5095 transitions. [2023-11-23 21:15:42,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:42,935 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 113 [2023-11-23 21:15:42,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:42,952 INFO L225 Difference]: With dead ends: 3883 [2023-11-23 21:15:42,952 INFO L226 Difference]: Without dead ends: 2511 [2023-11-23 21:15:42,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 115 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 21:15:42,958 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 113 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:42,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 147 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:15:42,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2511 states. [2023-11-23 21:15:43,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2511 to 2511. [2023-11-23 21:15:43,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2511 states, 2000 states have (on average 1.29) internal successors, (2580), 2014 states have internal predecessors, (2580), 310 states have call successors, (310), 201 states have call predecessors, (310), 200 states have return successors, (308), 296 states have call predecessors, (308), 308 states have call successors, (308) [2023-11-23 21:15:43,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2511 states to 2511 states and 3198 transitions. [2023-11-23 21:15:43,193 INFO L78 Accepts]: Start accepts. Automaton has 2511 states and 3198 transitions. Word has length 113 [2023-11-23 21:15:43,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:43,194 INFO L495 AbstractCegarLoop]: Abstraction has 2511 states and 3198 transitions. [2023-11-23 21:15:43,194 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:15:43,194 INFO L276 IsEmpty]: Start isEmpty. Operand 2511 states and 3198 transitions. [2023-11-23 21:15:43,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-23 21:15:43,204 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:43,204 INFO L195 NwaCegarLoop]: trace histogram [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, 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 21:15:43,235 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:43,429 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:43,430 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:43,430 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:43,430 INFO L85 PathProgramCache]: Analyzing trace with hash 1911739213, now seen corresponding path program 1 times [2023-11-23 21:15:43,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:43,430 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47044108] [2023-11-23 21:15:43,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:43,431 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:43,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:43,731 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:15:43,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:43,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47044108] [2023-11-23 21:15:43,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47044108] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:43,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888413801] [2023-11-23 21:15:43,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:43,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:43,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:43,736 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:43,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:15:43,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:43,916 INFO L262 TraceCheckSpWp]: Trace formula consists of 551 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:15:43,920 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:43,953 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-23 21:15:43,954 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:43,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888413801] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:43,954 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:43,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:15:43,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170902163] [2023-11-23 21:15:43,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:43,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:43,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:43,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:43,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:43,958 INFO L87 Difference]: Start difference. First operand 2511 states and 3198 transitions. Second operand has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:15:44,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:44,399 INFO L93 Difference]: Finished difference Result 5919 states and 7617 transitions. [2023-11-23 21:15:44,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:44,401 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 114 [2023-11-23 21:15:44,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:44,430 INFO L225 Difference]: With dead ends: 5919 [2023-11-23 21:15:44,430 INFO L226 Difference]: Without dead ends: 3415 [2023-11-23 21:15:44,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:15:44,441 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 60 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:44,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 220 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:44,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3415 states. [2023-11-23 21:15:44,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3415 to 2775. [2023-11-23 21:15:44,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2775 states, 2236 states have (on average 1.3076923076923077) internal successors, (2924), 2251 states have internal predecessors, (2924), 324 states have call successors, (324), 215 states have call predecessors, (324), 214 states have return successors, (322), 309 states have call predecessors, (322), 322 states have call successors, (322) [2023-11-23 21:15:44,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2775 states to 2775 states and 3570 transitions. [2023-11-23 21:15:44,733 INFO L78 Accepts]: Start accepts. Automaton has 2775 states and 3570 transitions. Word has length 114 [2023-11-23 21:15:44,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:44,733 INFO L495 AbstractCegarLoop]: Abstraction has 2775 states and 3570 transitions. [2023-11-23 21:15:44,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.333333333333332) internal successors, (79), 3 states have internal predecessors, (79), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2023-11-23 21:15:44,734 INFO L276 IsEmpty]: Start isEmpty. Operand 2775 states and 3570 transitions. [2023-11-23 21:15:44,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-23 21:15:44,746 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:44,746 INFO L195 NwaCegarLoop]: trace histogram [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, 1, 1, 1] [2023-11-23 21:15:44,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:44,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-23 21:15:44,968 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:44,969 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:44,969 INFO L85 PathProgramCache]: Analyzing trace with hash 595183212, now seen corresponding path program 1 times [2023-11-23 21:15:44,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:44,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281298690] [2023-11-23 21:15:44,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:44,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:45,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:45,114 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-23 21:15:45,115 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:45,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281298690] [2023-11-23 21:15:45,115 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281298690] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:45,115 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44649258] [2023-11-23 21:15:45,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:45,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:45,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:45,117 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:45,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:15:45,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:45,306 INFO L262 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:15:45,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:45,337 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:15:45,338 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:45,338 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44649258] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:45,338 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:45,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-11-23 21:15:45,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973160733] [2023-11-23 21:15:45,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:45,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:15:45,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:45,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:15:45,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:15:45,345 INFO L87 Difference]: Start difference. First operand 2775 states and 3570 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, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:15:45,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:45,766 INFO L93 Difference]: Finished difference Result 5211 states and 6770 transitions. [2023-11-23 21:15:45,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:15:45,767 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, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 114 [2023-11-23 21:15:45,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:45,792 INFO L225 Difference]: With dead ends: 5211 [2023-11-23 21:15:45,793 INFO L226 Difference]: Without dead ends: 3373 [2023-11-23 21:15:45,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 114 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 21:15:45,800 INFO L413 NwaCegarLoop]: 161 mSDtfsCounter, 63 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:45,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 274 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:45,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3373 states. [2023-11-23 21:15:46,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3373 to 3095. [2023-11-23 21:15:46,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3095 states, 2524 states have (on average 1.329635499207607) internal successors, (3356), 2539 states have internal predecessors, (3356), 340 states have call successors, (340), 231 states have call predecessors, (340), 230 states have return successors, (338), 325 states have call predecessors, (338), 338 states have call successors, (338) [2023-11-23 21:15:46,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3095 states to 3095 states and 4034 transitions. [2023-11-23 21:15:46,180 INFO L78 Accepts]: Start accepts. Automaton has 3095 states and 4034 transitions. Word has length 114 [2023-11-23 21:15:46,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:46,181 INFO L495 AbstractCegarLoop]: Abstraction has 3095 states and 4034 transitions. [2023-11-23 21:15:46,182 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, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-11-23 21:15:46,183 INFO L276 IsEmpty]: Start isEmpty. Operand 3095 states and 4034 transitions. [2023-11-23 21:15:46,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-11-23 21:15:46,195 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:46,195 INFO L195 NwaCegarLoop]: trace histogram [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, 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 21:15:46,228 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:46,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:46,413 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:46,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:46,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1846353302, now seen corresponding path program 1 times [2023-11-23 21:15:46,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:46,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379132603] [2023-11-23 21:15:46,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:46,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:46,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:46,682 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 19 proven. 26 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-23 21:15:46,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:46,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379132603] [2023-11-23 21:15:46,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379132603] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:46,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710296289] [2023-11-23 21:15:46,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:46,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:46,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:46,685 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:46,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 21:15:46,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:46,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:15:46,864 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:15:47,006 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:15:47,006 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:15:47,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710296289] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:15:47,007 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:15:47,007 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-11-23 21:15:47,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339839761] [2023-11-23 21:15:47,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:15:47,008 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:15:47,008 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:15:47,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:15:47,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:15:47,009 INFO L87 Difference]: Start difference. First operand 3095 states and 4034 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:15:47,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:15:47,552 INFO L93 Difference]: Finished difference Result 6029 states and 7934 transitions. [2023-11-23 21:15:47,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:15:47,553 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) Word has length 116 [2023-11-23 21:15:47,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:15:47,598 INFO L225 Difference]: With dead ends: 6029 [2023-11-23 21:15:47,598 INFO L226 Difference]: Without dead ends: 4427 [2023-11-23 21:15:47,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:15:47,607 INFO L413 NwaCegarLoop]: 188 mSDtfsCounter, 161 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:15:47,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 311 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:15:47,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4427 states. [2023-11-23 21:15:48,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4427 to 4248. [2023-11-23 21:15:48,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4248 states, 3550 states have (on average 1.3202816901408452) internal successors, (4687), 3565 states have internal predecessors, (4687), 392 states have call successors, (392), 306 states have call predecessors, (392), 305 states have return successors, (412), 377 states have call predecessors, (412), 390 states have call successors, (412) [2023-11-23 21:15:48,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4248 states to 4248 states and 5491 transitions. [2023-11-23 21:15:48,127 INFO L78 Accepts]: Start accepts. Automaton has 4248 states and 5491 transitions. Word has length 116 [2023-11-23 21:15:48,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:15:48,128 INFO L495 AbstractCegarLoop]: Abstraction has 4248 states and 5491 transitions. [2023-11-23 21:15:48,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:15:48,128 INFO L276 IsEmpty]: Start isEmpty. Operand 4248 states and 5491 transitions. [2023-11-23 21:15:48,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-11-23 21:15:48,142 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:15:48,143 INFO L195 NwaCegarLoop]: trace histogram [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, 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 21:15:48,168 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-23 21:15:48,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:48,356 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:15:48,356 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:15:48,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1784819499, now seen corresponding path program 1 times [2023-11-23 21:15:48,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:15:48,357 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433013489] [2023-11-23 21:15:48,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:48,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:15:48,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:15:48,482 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-11-23 21:15:48,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:15:48,482 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433013489] [2023-11-23 21:15:48,482 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433013489] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:15:48,483 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508207433] [2023-11-23 21:15:48,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:15:48,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:15:48,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:15:48,485 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:15:48,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c048c010-36e1-43a7-b613-242c191980e9/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-23 21:15:48,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat