./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/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 db9df7d135a21d792e3a2ca832f85f7c7fc22de6655b2cb0ba03be5cd467b7e3 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:36:02,546 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:36:02,614 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:36:02,619 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:36:02,620 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:36:02,661 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:36:02,662 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:36:02,663 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:36:02,664 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:36:02,669 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:36:02,670 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:36:02,671 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:36:02,672 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:36:02,673 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:36:02,674 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:36:02,674 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:36:02,675 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:36:02,675 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:36:02,676 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:36:02,676 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:36:02,677 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:36:02,677 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:36:02,678 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:36:02,679 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:36:02,679 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:36:02,680 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:36:02,680 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:36:02,681 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:36:02,681 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:36:02,682 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:36:02,683 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:36:02,683 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:36:02,684 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:36:02,684 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:36:02,685 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:36:02,685 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:36:02,685 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:36:02,686 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:36:02,686 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:36:02,686 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:36:02,687 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:36:02,687 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:36:02,687 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:36:02,687 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:36:02,688 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:36:02,688 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:36:02,689 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:36:02,689 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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> db9df7d135a21d792e3a2ca832f85f7c7fc22de6655b2cb0ba03be5cd467b7e3 [2023-11-23 20:36:03,077 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:36:03,104 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:36:03,108 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:36:03,111 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:36:03,111 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:36:03,113 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c [2023-11-23 20:36:06,234 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:36:07,060 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:36:07,061 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c [2023-11-23 20:36:07,115 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/data/6f3cfbfee/aa8c706d9bff4a6b966ee977ec7423b1/FLAG828a3f38c [2023-11-23 20:36:07,133 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/data/6f3cfbfee/aa8c706d9bff4a6b966ee977ec7423b1 [2023-11-23 20:36:07,140 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:36:07,143 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:36:07,149 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:36:07,149 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:36:07,159 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:36:07,160 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:07" (1/1) ... [2023-11-23 20:36:07,161 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d9242fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:07, skipping insertion in model container [2023-11-23 20:36:07,161 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:07" (1/1) ... [2023-11-23 20:36:07,431 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:36:09,766 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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c[381679,381692] [2023-11-23 20:36:09,792 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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c[383339,383352] [2023-11-23 20:36:10,096 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:36:10,111 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:36:11,481 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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c[381679,381692] [2023-11-23 20:36:11,485 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_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/sv-benchmarks/c/combinations/Problem05_label43+token_ring.08.cil-1.c[383339,383352] [2023-11-23 20:36:11,527 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:36:11,613 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:36:11,614 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11 WrapperNode [2023-11-23 20:36:11,614 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:36:11,615 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:36:11,615 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:36:11,616 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:36:11,661 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:11,804 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,301 INFO L138 Inliner]: procedures = 60, calls = 65, calls flagged for inlining = 38, calls inlined = 38, statements flattened = 12988 [2023-11-23 20:36:12,301 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:36:12,302 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:36:12,303 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:36:12,303 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:36:12,312 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,313 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,384 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,384 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,652 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,766 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,784 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,804 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,864 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:36:12,866 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:36:12,866 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:36:12,866 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:36:12,867 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (1/1) ... [2023-11-23 20:36:12,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:36:12,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:12,898 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:36:12,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:36:12,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:36:12,937 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-23 20:36:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-23 20:36:12,938 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-23 20:36:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-23 20:36:12,938 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-23 20:36:12,938 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-23 20:36:12,939 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-23 20:36:12,939 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-23 20:36:12,939 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-23 20:36:12,939 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-23 20:36:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-23 20:36:12,940 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-23 20:36:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:36:12,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:36:12,940 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:36:13,074 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:36:13,076 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:36:22,242 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:36:25,075 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:36:25,075 INFO L309 CfgBuilder]: Removed 12 assume(true) statements. [2023-11-23 20:36:25,078 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:25 BoogieIcfgContainer [2023-11-23 20:36:25,078 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:36:25,081 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:36:25,082 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:36:25,085 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:36:25,085 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:36:07" (1/3) ... [2023-11-23 20:36:25,086 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22cb4cf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:25, skipping insertion in model container [2023-11-23 20:36:25,086 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:11" (2/3) ... [2023-11-23 20:36:25,087 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22cb4cf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:25, skipping insertion in model container [2023-11-23 20:36:25,087 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:25" (3/3) ... [2023-11-23 20:36:25,089 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem05_label43+token_ring.08.cil-1.c [2023-11-23 20:36:25,110 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:36:25,110 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2023-11-23 20:36:25,201 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:36:25,208 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;@6cfbde4d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:36:25,208 INFO L358 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2023-11-23 20:36:25,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 1796 states, 1765 states have (on average 1.9592067988668556) internal successors, (3458), 1768 states have internal predecessors, (3458), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-11-23 20:36:25,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-11-23 20:36:25,234 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:25,235 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:25,235 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:25,240 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:25,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1860542625, now seen corresponding path program 1 times [2023-11-23 20:36:25,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:25,249 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345688619] [2023-11-23 20:36:25,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:25,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:25,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:25,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:25,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:25,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345688619] [2023-11-23 20:36:25,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345688619] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:25,884 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:25,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:36:25,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737641407] [2023-11-23 20:36:25,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:25,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:36:25,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:25,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:36:25,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:36:25,943 INFO L87 Difference]: Start difference. First operand has 1796 states, 1765 states have (on average 1.9592067988668556) internal successors, (3458), 1768 states have internal predecessors, (3458), 22 states have call successors, (22), 6 states have call predecessors, (22), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:36:27,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:27,153 INFO L93 Difference]: Finished difference Result 3728 states and 7230 transitions. [2023-11-23 20:36:27,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 20:36:27,156 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 55 [2023-11-23 20:36:27,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:27,192 INFO L225 Difference]: With dead ends: 3728 [2023-11-23 20:36:27,192 INFO L226 Difference]: Without dead ends: 1931 [2023-11-23 20:36:27,205 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 20:36:27,211 INFO L413 NwaCegarLoop]: 3409 mSDtfsCounter, 3665 mSDsluCounter, 3327 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3665 SdHoareTripleChecker+Valid, 6736 SdHoareTripleChecker+Invalid, 676 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:27,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3665 Valid, 6736 Invalid, 676 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [14 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 20:36:27,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1931 states. [2023-11-23 20:36:27,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1931 to 1930. [2023-11-23 20:36:27,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1930 states, 1876 states have (on average 1.9243070362473347) internal successors, (3610), 1879 states have internal predecessors, (3610), 40 states have call successors, (40), 12 states have call predecessors, (40), 12 states have return successors, (40), 39 states have call predecessors, (40), 40 states have call successors, (40) [2023-11-23 20:36:27,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1930 states to 1930 states and 3690 transitions. [2023-11-23 20:36:27,394 INFO L78 Accepts]: Start accepts. Automaton has 1930 states and 3690 transitions. Word has length 55 [2023-11-23 20:36:27,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:27,395 INFO L495 AbstractCegarLoop]: Abstraction has 1930 states and 3690 transitions. [2023-11-23 20:36:27,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 4 states have internal predecessors, (45), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:36:27,396 INFO L276 IsEmpty]: Start isEmpty. Operand 1930 states and 3690 transitions. [2023-11-23 20:36:27,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:36:27,404 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:27,405 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:27,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:36:27,405 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:27,406 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:27,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1174280580, now seen corresponding path program 1 times [2023-11-23 20:36:27,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:27,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893949776] [2023-11-23 20:36:27,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:27,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:27,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:27,763 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:36:27,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:27,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893949776] [2023-11-23 20:36:27,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893949776] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:27,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1998495519] [2023-11-23 20:36:27,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:27,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:27,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:27,768 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:27,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:36:28,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:28,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 759 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:36:28,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:28,103 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-23 20:36:28,103 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:36:28,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1998495519] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:28,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:36:28,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:36:28,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738256699] [2023-11-23 20:36:28,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:28,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:28,108 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:28,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:28,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:28,109 INFO L87 Difference]: Start difference. First operand 1930 states and 3690 transitions. Second operand has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:28,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:28,662 INFO L93 Difference]: Finished difference Result 2491 states and 4529 transitions. [2023-11-23 20:36:28,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:28,663 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2023-11-23 20:36:28,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:28,680 INFO L225 Difference]: With dead ends: 2491 [2023-11-23 20:36:28,680 INFO L226 Difference]: Without dead ends: 2207 [2023-11-23 20:36:28,682 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:28,684 INFO L413 NwaCegarLoop]: 3283 mSDtfsCounter, 3462 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3462 SdHoareTripleChecker+Valid, 3457 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:28,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3462 Valid, 3457 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:28,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2207 states. [2023-11-23 20:36:28,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2207 to 2203. [2023-11-23 20:36:28,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2203 states, 2103 states have (on average 1.8720874940561103) internal successors, (3937), 2107 states have internal predecessors, (3937), 74 states have call successors, (74), 24 states have call predecessors, (74), 24 states have return successors, (74), 72 states have call predecessors, (74), 74 states have call successors, (74) [2023-11-23 20:36:28,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2203 states to 2203 states and 4085 transitions. [2023-11-23 20:36:28,791 INFO L78 Accepts]: Start accepts. Automaton has 2203 states and 4085 transitions. Word has length 109 [2023-11-23 20:36:28,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:28,791 INFO L495 AbstractCegarLoop]: Abstraction has 2203 states and 4085 transitions. [2023-11-23 20:36:28,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 23.333333333333332) internal successors, (70), 2 states have internal predecessors, (70), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:28,792 INFO L276 IsEmpty]: Start isEmpty. Operand 2203 states and 4085 transitions. [2023-11-23 20:36:28,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:36:28,800 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:28,800 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:28,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:29,014 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-23 20:36:29,014 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:29,014 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:29,015 INFO L85 PathProgramCache]: Analyzing trace with hash 458902748, now seen corresponding path program 1 times [2023-11-23 20:36:29,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:29,015 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9067000] [2023-11-23 20:36:29,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:29,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:29,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:29,220 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:36:29,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:29,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9067000] [2023-11-23 20:36:29,227 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9067000] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:29,227 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052722431] [2023-11-23 20:36:29,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:29,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:29,229 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:29,230 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:29,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:36:29,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:29,442 INFO L262 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:36:29,448 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:29,509 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 20:36:29,512 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:36:29,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052722431] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:29,514 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:36:29,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:36:29,515 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534377698] [2023-11-23 20:36:29,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:29,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:29,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:29,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:29,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:29,520 INFO L87 Difference]: Start difference. First operand 2203 states and 4085 transitions. Second operand has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:30,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:30,100 INFO L93 Difference]: Finished difference Result 3304 states and 5724 transitions. [2023-11-23 20:36:30,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:30,101 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2023-11-23 20:36:30,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:30,120 INFO L225 Difference]: With dead ends: 3304 [2023-11-23 20:36:30,121 INFO L226 Difference]: Without dead ends: 2747 [2023-11-23 20:36:30,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:30,126 INFO L413 NwaCegarLoop]: 3256 mSDtfsCounter, 3456 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3456 SdHoareTripleChecker+Valid, 3430 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:30,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3456 Valid, 3430 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:36:30,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2747 states. [2023-11-23 20:36:30,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2747 to 2741. [2023-11-23 20:36:30,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2741 states, 2551 states have (on average 1.7949823598588788) internal successors, (4579), 2557 states have internal predecessors, (4579), 140 states have call successors, (140), 48 states have call predecessors, (140), 48 states have return successors, (140), 136 states have call predecessors, (140), 140 states have call successors, (140) [2023-11-23 20:36:30,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2741 states to 2741 states and 4859 transitions. [2023-11-23 20:36:30,243 INFO L78 Accepts]: Start accepts. Automaton has 2741 states and 4859 transitions. Word has length 109 [2023-11-23 20:36:30,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:30,243 INFO L495 AbstractCegarLoop]: Abstraction has 2741 states and 4859 transitions. [2023-11-23 20:36:30,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.333333333333332) internal successors, (76), 2 states have internal predecessors, (76), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:30,244 INFO L276 IsEmpty]: Start isEmpty. Operand 2741 states and 4859 transitions. [2023-11-23 20:36:30,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:36:30,249 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:30,249 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:30,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:30,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:30,471 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:30,472 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:30,472 INFO L85 PathProgramCache]: Analyzing trace with hash -417924292, now seen corresponding path program 1 times [2023-11-23 20:36:30,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:30,472 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143087625] [2023-11-23 20:36:30,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:30,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:30,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:30,690 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:36:30,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:30,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143087625] [2023-11-23 20:36:30,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143087625] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:30,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1486103087] [2023-11-23 20:36:30,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:30,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:30,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:30,697 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:30,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:36:30,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:30,898 INFO L262 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:36:30,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:30,947 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-23 20:36:30,949 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:36:30,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1486103087] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:30,950 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:36:30,950 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:36:30,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252377614] [2023-11-23 20:36:30,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:30,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:30,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:30,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:30,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:30,953 INFO L87 Difference]: Start difference. First operand 2741 states and 4859 transitions. Second operand has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:31,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:31,525 INFO L93 Difference]: Finished difference Result 4906 states and 8064 transitions. [2023-11-23 20:36:31,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:31,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2023-11-23 20:36:31,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:31,554 INFO L225 Difference]: With dead ends: 4906 [2023-11-23 20:36:31,554 INFO L226 Difference]: Without dead ends: 3811 [2023-11-23 20:36:31,561 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:31,562 INFO L413 NwaCegarLoop]: 3279 mSDtfsCounter, 3465 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3465 SdHoareTripleChecker+Valid, 3453 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:31,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3465 Valid, 3453 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:31,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3811 states. [2023-11-23 20:36:31,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3811 to 3801. [2023-11-23 20:36:31,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3801 states, 3435 states have (on average 1.6998544395924309) internal successors, (5839), 3445 states have internal predecessors, (5839), 268 states have call successors, (268), 96 states have call predecessors, (268), 96 states have return successors, (268), 260 states have call predecessors, (268), 268 states have call successors, (268) [2023-11-23 20:36:31,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3801 states to 3801 states and 6375 transitions. [2023-11-23 20:36:31,746 INFO L78 Accepts]: Start accepts. Automaton has 3801 states and 6375 transitions. Word has length 109 [2023-11-23 20:36:31,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:31,748 INFO L495 AbstractCegarLoop]: Abstraction has 3801 states and 6375 transitions. [2023-11-23 20:36:31,748 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.333333333333332) internal successors, (67), 2 states have internal predecessors, (67), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:31,748 INFO L276 IsEmpty]: Start isEmpty. Operand 3801 states and 6375 transitions. [2023-11-23 20:36:31,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:36:31,757 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:31,757 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:31,783 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:31,978 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:31,979 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:31,979 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:31,979 INFO L85 PathProgramCache]: Analyzing trace with hash 357071068, now seen corresponding path program 1 times [2023-11-23 20:36:31,979 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:31,979 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592589716] [2023-11-23 20:36:31,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:31,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:32,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:32,131 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 20:36:32,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:32,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592589716] [2023-11-23 20:36:32,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592589716] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:32,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260825306] [2023-11-23 20:36:32,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:32,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:32,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:32,133 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:32,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:36:32,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:32,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 20:36:32,345 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:32,405 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-23 20:36:32,405 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:36:32,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260825306] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:32,406 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:36:32,406 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2023-11-23 20:36:32,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018993376] [2023-11-23 20:36:32,407 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:32,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:32,408 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:32,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:32,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:32,409 INFO L87 Difference]: Start difference. First operand 3801 states and 6375 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:33,173 INFO L93 Difference]: Finished difference Result 8062 states and 12644 transitions. [2023-11-23 20:36:33,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:33,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 109 [2023-11-23 20:36:33,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:33,213 INFO L225 Difference]: With dead ends: 8062 [2023-11-23 20:36:33,213 INFO L226 Difference]: Without dead ends: 5907 [2023-11-23 20:36:33,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:36:33,223 INFO L413 NwaCegarLoop]: 3238 mSDtfsCounter, 3450 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3450 SdHoareTripleChecker+Valid, 3412 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:33,223 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3450 Valid, 3412 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:33,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5907 states. [2023-11-23 20:36:33,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5907 to 5889. [2023-11-23 20:36:33,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5889 states, 5179 states have (on average 1.604749951728133) internal successors, (8311), 5197 states have internal predecessors, (8311), 516 states have call successors, (516), 192 states have call predecessors, (516), 192 states have return successors, (516), 500 states have call predecessors, (516), 516 states have call successors, (516) [2023-11-23 20:36:33,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5889 states to 5889 states and 9343 transitions. [2023-11-23 20:36:33,517 INFO L78 Accepts]: Start accepts. Automaton has 5889 states and 9343 transitions. Word has length 109 [2023-11-23 20:36:33,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:33,518 INFO L495 AbstractCegarLoop]: Abstraction has 5889 states and 9343 transitions. [2023-11-23 20:36:33,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 20:36:33,519 INFO L276 IsEmpty]: Start isEmpty. Operand 5889 states and 9343 transitions. [2023-11-23 20:36:33,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-23 20:36:33,529 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:33,529 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:33,562 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:33,745 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fc3ca3b-b2ce-4808-b38a-fab0eec2d1b4/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:33,746 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:33,746 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:33,746 INFO L85 PathProgramCache]: Analyzing trace with hash -566268100, now seen corresponding path program 1 times [2023-11-23 20:36:33,746 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:33,747 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392737910] [2023-11-23 20:36:33,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:33,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:33,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:33,885 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-23 20:36:33,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:33,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392737910] [2023-11-23 20:36:33,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392737910] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:33,886 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:33,886 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:36:33,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610975996] [2023-11-23 20:36:33,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:33,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:33,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:33,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:33,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:33,888 INFO L87 Difference]: Start difference. First operand 5889 states and 9343 transitions. Second operand has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:36:34,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:34,630 INFO L93 Difference]: Finished difference Result 9251 states and 14288 transitions. [2023-11-23 20:36:34,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:34,631 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 109 [2023-11-23 20:36:34,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:34,684 INFO L225 Difference]: With dead ends: 9251 [2023-11-23 20:36:34,684 INFO L226 Difference]: Without dead ends: 7089 [2023-11-23 20:36:34,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:34,696 INFO L413 NwaCegarLoop]: 3342 mSDtfsCounter, 99 mSDsluCounter, 3247 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 6589 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:34,696 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 6589 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 20:36:34,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7089 states. [2023-11-23 20:36:34,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7089 to 6753. [2023-11-23 20:36:34,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6753 states, 6011 states have (on average 1.603560139743803) internal successors, (9639), 6029 states have internal predecessors, (9639), 532 states have call successors, (532), 208 states have call predecessors, (532), 208 states have return successors, (532), 516 states have call predecessors, (532), 532 states have call successors, (532) [2023-11-23 20:36:35,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6753 states to 6753 states and 10703 transitions. [2023-11-23 20:36:35,017 INFO L78 Accepts]: Start accepts. Automaton has 6753 states and 10703 transitions. Word has length 109 [2023-11-23 20:36:35,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:35,018 INFO L495 AbstractCegarLoop]: Abstraction has 6753 states and 10703 transitions. [2023-11-23 20:36:35,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.333333333333332) internal successors, (64), 3 states have internal predecessors, (64), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-23 20:36:35,019 INFO L276 IsEmpty]: Start isEmpty. Operand 6753 states and 10703 transitions. [2023-11-23 20:36:35,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-11-23 20:36:35,038 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:35,038 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-11-23 20:36:35,038 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 20:36:35,039 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:35,039 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:35,039 INFO L85 PathProgramCache]: Analyzing trace with hash 2064480607, now seen corresponding path program 1 times [2023-11-23 20:36:35,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:35,040 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805904555] [2023-11-23 20:36:35,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:35,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:35,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:35,186 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-11-23 20:36:35,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:35,186 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805904555] [2023-11-23 20:36:35,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805904555] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:35,187 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:35,187 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:36:35,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693735493] [2023-11-23 20:36:35,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:35,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:35,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:35,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:35,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:35,189 INFO L87 Difference]: Start difference. First operand 6753 states and 10703 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:36,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:36,143 INFO L93 Difference]: Finished difference Result 16822 states and 25588 transitions. [2023-11-23 20:36:36,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:36,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2023-11-23 20:36:36,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:36,200 INFO L225 Difference]: With dead ends: 16822 [2023-11-23 20:36:36,201 INFO L226 Difference]: Without dead ends: 11715 [2023-11-23 20:36:36,222 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:36,223 INFO L413 NwaCegarLoop]: 3240 mSDtfsCounter, 3451 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3451 SdHoareTripleChecker+Valid, 3414 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:36,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3451 Valid, 3414 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:36,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11715 states. [2023-11-23 20:36:36,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11715 to 11665. [2023-11-23 20:36:36,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11665 states, 10219 states have (on average 1.5350817105391916) internal successors, (15687), 10253 states have internal predecessors, (15687), 1028 states have call successors, (1028), 416 states have call predecessors, (1028), 416 states have return successors, (1028), 996 states have call predecessors, (1028), 1028 states have call successors, (1028) [2023-11-23 20:36:36,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11665 states to 11665 states and 17743 transitions. [2023-11-23 20:36:36,908 INFO L78 Accepts]: Start accepts. Automaton has 11665 states and 17743 transitions. Word has length 148 [2023-11-23 20:36:36,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:36,910 INFO L495 AbstractCegarLoop]: Abstraction has 11665 states and 17743 transitions. [2023-11-23 20:36:36,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:36,910 INFO L276 IsEmpty]: Start isEmpty. Operand 11665 states and 17743 transitions. [2023-11-23 20:36:36,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-11-23 20:36:36,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:36,950 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-11-23 20:36:36,950 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 20:36:36,951 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:36,951 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:36,951 INFO L85 PathProgramCache]: Analyzing trace with hash 912667597, now seen corresponding path program 1 times [2023-11-23 20:36:36,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:36,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408758760] [2023-11-23 20:36:36,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:36,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:36,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:37,109 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-11-23 20:36:37,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:37,110 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408758760] [2023-11-23 20:36:37,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408758760] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:37,110 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:37,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:36:37,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676512633] [2023-11-23 20:36:37,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:37,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:37,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:37,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:37,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:37,114 INFO L87 Difference]: Start difference. First operand 11665 states and 17743 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:38,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:38,431 INFO L93 Difference]: Finished difference Result 31414 states and 46708 transitions. [2023-11-23 20:36:38,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:38,432 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2023-11-23 20:36:38,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:38,526 INFO L225 Difference]: With dead ends: 31414 [2023-11-23 20:36:38,527 INFO L226 Difference]: Without dead ends: 21395 [2023-11-23 20:36:38,573 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:38,574 INFO L413 NwaCegarLoop]: 3240 mSDtfsCounter, 3453 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3453 SdHoareTripleChecker+Valid, 3414 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:38,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3453 Valid, 3414 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:38,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21395 states. [2023-11-23 20:36:39,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21395 to 21297. [2023-11-23 20:36:39,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21297 states, 18475 states have (on average 1.4864952638700948) internal successors, (27463), 18541 states have internal predecessors, (27463), 1988 states have call successors, (1988), 832 states have call predecessors, (1988), 832 states have return successors, (1988), 1924 states have call predecessors, (1988), 1988 states have call successors, (1988) [2023-11-23 20:36:39,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21297 states to 21297 states and 31439 transitions. [2023-11-23 20:36:39,763 INFO L78 Accepts]: Start accepts. Automaton has 21297 states and 31439 transitions. Word has length 148 [2023-11-23 20:36:39,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:39,764 INFO L495 AbstractCegarLoop]: Abstraction has 21297 states and 31439 transitions. [2023-11-23 20:36:39,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:39,764 INFO L276 IsEmpty]: Start isEmpty. Operand 21297 states and 31439 transitions. [2023-11-23 20:36:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-11-23 20:36:39,831 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:39,832 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-11-23 20:36:39,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 20:36:39,832 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:39,832 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:39,833 INFO L85 PathProgramCache]: Analyzing trace with hash -1861136918, now seen corresponding path program 1 times [2023-11-23 20:36:39,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:39,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34833904] [2023-11-23 20:36:39,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:39,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:39,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:39,958 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-11-23 20:36:39,958 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:39,958 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34833904] [2023-11-23 20:36:39,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34833904] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:39,959 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:39,959 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:36:39,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155013781] [2023-11-23 20:36:39,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:39,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:39,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:39,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:39,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:39,962 INFO L87 Difference]: Start difference. First operand 21297 states and 31439 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:41,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:41,700 INFO L93 Difference]: Finished difference Result 60022 states and 87764 transitions. [2023-11-23 20:36:41,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:41,701 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2023-11-23 20:36:41,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:41,863 INFO L225 Difference]: With dead ends: 60022 [2023-11-23 20:36:41,863 INFO L226 Difference]: Without dead ends: 40371 [2023-11-23 20:36:41,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:41,936 INFO L413 NwaCegarLoop]: 3240 mSDtfsCounter, 3455 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3455 SdHoareTripleChecker+Valid, 3414 SdHoareTripleChecker+Invalid, 289 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:41,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3455 Valid, 3414 Invalid, 289 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:41,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40371 states. [2023-11-23 20:36:43,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40371 to 40177. [2023-11-23 20:36:43,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40177 states, 34667 states have (on average 1.453111027778579) internal successors, (50375), 34797 states have internal predecessors, (50375), 3844 states have call successors, (3844), 1664 states have call predecessors, (3844), 1664 states have return successors, (3844), 3716 states have call predecessors, (3844), 3844 states have call successors, (3844) [2023-11-23 20:36:44,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40177 states to 40177 states and 58063 transitions. [2023-11-23 20:36:44,091 INFO L78 Accepts]: Start accepts. Automaton has 40177 states and 58063 transitions. Word has length 148 [2023-11-23 20:36:44,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:44,092 INFO L495 AbstractCegarLoop]: Abstraction has 40177 states and 58063 transitions. [2023-11-23 20:36:44,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-11-23 20:36:44,092 INFO L276 IsEmpty]: Start isEmpty. Operand 40177 states and 58063 transitions. [2023-11-23 20:36:44,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2023-11-23 20:36:44,217 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:44,217 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1] [2023-11-23 20:36:44,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 20:36:44,218 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:36:44,218 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:44,218 INFO L85 PathProgramCache]: Analyzing trace with hash -233684752, now seen corresponding path program 1 times [2023-11-23 20:36:44,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:44,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046340819] [2023-11-23 20:36:44,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:44,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:44,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:44,385 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-11-23 20:36:44,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:44,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046340819] [2023-11-23 20:36:44,386 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046340819] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:44,386 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:44,386 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:36:44,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [850971406] [2023-11-23 20:36:44,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:44,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:44,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:44,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:44,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:44,389 INFO L87 Difference]: Start difference. First operand 40177 states and 58063 transitions. Second operand has 3 states, 3 states have (on average 24.0) internal successors, (72), 3 states have internal predecessors, (72), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9)