./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.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_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/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_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/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_8ebf9365-1323-447c-9846-412038807bb8/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 a2c5c77b8d7714bea640ff99a5b0e1a19cf307340ccbaffec9b7e0efde04f6ec --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:27:01,157 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:27:01,291 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:27:01,304 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:27:01,305 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:27:01,364 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:27:01,365 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:27:01,366 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:27:01,367 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:27:01,372 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:27:01,373 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:27:01,373 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:27:01,374 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:27:01,376 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:27:01,376 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:27:01,377 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:27:01,377 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:27:01,378 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:27:01,378 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:27:01,379 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:27:01,379 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:27:01,380 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:27:01,381 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:27:01,382 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:27:01,382 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:27:01,383 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:27:01,383 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:27:01,384 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:27:01,384 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:27:01,385 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:27:01,386 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:27:01,387 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:27:01,387 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:27:01,387 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:27:01,388 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:27:01,388 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:27:01,395 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:27:01,395 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:27:01,395 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:27:01,396 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:27:01,396 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:27:01,397 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:27:01,397 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:27:01,397 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:27:01,398 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:27:01,398 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:27:01,398 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:27:01,399 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_8ebf9365-1323-447c-9846-412038807bb8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a2c5c77b8d7714bea640ff99a5b0e1a19cf307340ccbaffec9b7e0efde04f6ec [2023-11-23 21:27:01,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:27:01,796 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:27:01,799 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:27:01,800 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:27:01,801 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:27:01,802 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2023-11-23 21:27:04,907 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:27:05,273 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:27:05,273 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2023-11-23 21:27:05,291 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/data/bfa2f687f/e517af95dbe24ca99f5d6dc390592a21/FLAG0601dc607 [2023-11-23 21:27:05,307 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/data/bfa2f687f/e517af95dbe24ca99f5d6dc390592a21 [2023-11-23 21:27:05,310 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:27:05,312 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:27:05,313 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:27:05,314 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:27:05,320 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:27:05,321 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,322 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3583474c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05, skipping insertion in model container [2023-11-23 21:27:05,322 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,386 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:27:05,734 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_8ebf9365-1323-447c-9846-412038807bb8/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2023-11-23 21:27:05,738 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:27:05,752 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:27:05,864 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_8ebf9365-1323-447c-9846-412038807bb8/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c[12951,12964] [2023-11-23 21:27:05,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:27:05,895 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:27:05,896 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05 WrapperNode [2023-11-23 21:27:05,896 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:27:05,897 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:27:05,897 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:27:05,897 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:27:05,905 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,918 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,968 INFO L138 Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 472 [2023-11-23 21:27:05,979 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:27:05,980 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:27:05,980 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:27:05,980 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:27:05,991 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,991 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,997 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:05,997 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,010 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,031 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,034 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,037 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,045 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:27:06,047 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:27:06,048 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:27:06,051 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:27:06,052 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (1/1) ... [2023-11-23 21:27:06,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:27:06,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:06,103 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:27:06,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:27:06,156 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:27:06,156 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:27:06,156 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:27:06,158 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:27:06,326 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:27:06,329 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:27:07,073 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:27:07,853 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:27:07,853 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 21:27:07,855 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:27:07 BoogieIcfgContainer [2023-11-23 21:27:07,856 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:27:07,859 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:27:07,859 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:27:07,863 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:27:07,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:27:05" (1/3) ... [2023-11-23 21:27:07,865 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffeb862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:27:07, skipping insertion in model container [2023-11-23 21:27:07,866 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:27:05" (2/3) ... [2023-11-23 21:27:07,868 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@ffeb862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:27:07, skipping insertion in model container [2023-11-23 21:27:07,869 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:27:07" (3/3) ... [2023-11-23 21:27:07,870 INFO L112 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.1.ufo.UNBOUNDED.pals.c [2023-11-23 21:27:07,894 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:27:07,894 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:27:07,967 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:27:07,977 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;@349d2f75, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:27:07,978 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:27:07,984 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:07,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:27:07,992 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:07,993 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:27:07,994 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:08,004 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:08,004 INFO L85 PathProgramCache]: Analyzing trace with hash -1152556728, now seen corresponding path program 1 times [2023-11-23 21:27:08,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:08,018 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959358882] [2023-11-23 21:27:08,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:08,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:08,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:10,211 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:10,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:10,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959358882] [2023-11-23 21:27:10,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959358882] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:10,213 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:10,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:10,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204924676] [2023-11-23 21:27:10,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:10,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:10,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:10,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:10,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:10,260 INFO L87 Difference]: Start difference. First operand has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:10,396 INFO L93 Difference]: Finished difference Result 54 states and 90 transitions. [2023-11-23 21:27:10,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:10,398 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:27:10,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:10,407 INFO L225 Difference]: With dead ends: 54 [2023-11-23 21:27:10,408 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:27:10,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:10,414 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 24 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:10,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 38 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:10,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:27:10,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-23 21:27:10,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:10,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 43 transitions. [2023-11-23 21:27:10,453 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 43 transitions. Word has length 6 [2023-11-23 21:27:10,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:10,454 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 43 transitions. [2023-11-23 21:27:10,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:10,455 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 43 transitions. [2023-11-23 21:27:10,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:27:10,456 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:10,456 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:10,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:27:10,456 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:10,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:10,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1432241245, now seen corresponding path program 1 times [2023-11-23 21:27:10,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:10,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573362732] [2023-11-23 21:27:10,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:10,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:10,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:11,451 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:11,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:11,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573362732] [2023-11-23 21:27:11,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573362732] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:11,454 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:11,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:11,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113453372] [2023-11-23 21:27:11,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:11,456 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:11,456 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:11,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:11,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:11,457 INFO L87 Difference]: Start difference. First operand 27 states and 43 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:11,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:11,555 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2023-11-23 21:27:11,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:11,556 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:27:11,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:11,558 INFO L225 Difference]: With dead ends: 53 [2023-11-23 21:27:11,559 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:27:11,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:11,567 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 22 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:11,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:11,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:27:11,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-23 21:27:11,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:11,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions. [2023-11-23 21:27:11,580 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 7 [2023-11-23 21:27:11,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:11,581 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 42 transitions. [2023-11-23 21:27:11,581 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:11,581 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions. [2023-11-23 21:27:11,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:27:11,583 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:11,583 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:11,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:27:11,584 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:11,593 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:11,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1507074927, now seen corresponding path program 1 times [2023-11-23 21:27:11,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:11,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552994106] [2023-11-23 21:27:11,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:11,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:11,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:12,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:12,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:12,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552994106] [2023-11-23 21:27:12,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552994106] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:12,614 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:12,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:12,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417185643] [2023-11-23 21:27:12,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:12,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:12,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:12,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:12,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:12,620 INFO L87 Difference]: Start difference. First operand 27 states and 42 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:12,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:12,732 INFO L93 Difference]: Finished difference Result 53 states and 80 transitions. [2023-11-23 21:27:12,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:12,733 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:27:12,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:12,736 INFO L225 Difference]: With dead ends: 53 [2023-11-23 21:27:12,737 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:27:12,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:12,748 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:12,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:12,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:27:12,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-23 21:27:12,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:12,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions. [2023-11-23 21:27:12,760 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 8 [2023-11-23 21:27:12,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:12,765 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 41 transitions. [2023-11-23 21:27:12,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:12,766 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions. [2023-11-23 21:27:12,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:27:12,767 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:12,767 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:12,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:27:12,767 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:12,768 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:12,769 INFO L85 PathProgramCache]: Analyzing trace with hash 473499980, now seen corresponding path program 1 times [2023-11-23 21:27:12,769 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:12,769 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1805388653] [2023-11-23 21:27:12,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:12,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:12,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:13,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:13,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:13,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1805388653] [2023-11-23 21:27:13,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1805388653] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:13,670 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:13,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:13,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979317808] [2023-11-23 21:27:13,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:13,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:13,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:13,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:13,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:13,672 INFO L87 Difference]: Start difference. First operand 27 states and 41 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:13,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:13,772 INFO L93 Difference]: Finished difference Result 53 states and 79 transitions. [2023-11-23 21:27:13,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:13,772 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:27:13,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:13,773 INFO L225 Difference]: With dead ends: 53 [2023-11-23 21:27:13,774 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:27:13,774 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:13,775 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:13,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 43 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:13,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:27:13,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-23 21:27:13,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:13,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions. [2023-11-23 21:27:13,782 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 9 [2023-11-23 21:27:13,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:13,783 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 40 transitions. [2023-11-23 21:27:13,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:13,783 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions. [2023-11-23 21:27:13,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:27:13,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:13,784 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:13,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:27:13,784 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:13,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:13,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1709369580, now seen corresponding path program 1 times [2023-11-23 21:27:13,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:13,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452561326] [2023-11-23 21:27:13,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:13,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:13,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:14,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:14,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:14,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452561326] [2023-11-23 21:27:14,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452561326] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:14,813 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:14,813 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:14,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219726634] [2023-11-23 21:27:14,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:14,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:14,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:14,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:14,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:14,816 INFO L87 Difference]: Start difference. First operand 27 states and 40 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:14,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:14,915 INFO L93 Difference]: Finished difference Result 53 states and 78 transitions. [2023-11-23 21:27:14,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:14,915 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:27:14,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:14,918 INFO L225 Difference]: With dead ends: 53 [2023-11-23 21:27:14,918 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:27:14,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:14,919 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 15 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:14,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 42 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:14,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:27:14,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27. [2023-11-23 21:27:14,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:14,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions. [2023-11-23 21:27:14,934 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 11 [2023-11-23 21:27:14,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:14,935 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 39 transitions. [2023-11-23 21:27:14,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:14,935 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions. [2023-11-23 21:27:14,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:27:14,936 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:14,936 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:14,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:27:14,936 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:14,937 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:14,937 INFO L85 PathProgramCache]: Analyzing trace with hash -1538863032, now seen corresponding path program 1 times [2023-11-23 21:27:14,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:14,937 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154074859] [2023-11-23 21:27:14,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:14,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:15,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:15,712 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:15,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:15,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154074859] [2023-11-23 21:27:15,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154074859] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:15,713 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:15,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:15,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66488585] [2023-11-23 21:27:15,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:15,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:15,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:15,715 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:15,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:15,715 INFO L87 Difference]: Start difference. First operand 27 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:15,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:15,795 INFO L93 Difference]: Finished difference Result 54 states and 79 transitions. [2023-11-23 21:27:15,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:15,799 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 21:27:15,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:15,801 INFO L225 Difference]: With dead ends: 54 [2023-11-23 21:27:15,802 INFO L226 Difference]: Without dead ends: 35 [2023-11-23 21:27:15,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:15,803 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:15,805 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:15,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-23 21:27:15,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27. [2023-11-23 21:27:15,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:15,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2023-11-23 21:27:15,816 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12 [2023-11-23 21:27:15,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:15,816 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2023-11-23 21:27:15,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:15,817 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2023-11-23 21:27:15,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:27:15,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:15,818 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:15,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-23 21:27:15,818 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:15,818 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:15,819 INFO L85 PathProgramCache]: Analyzing trace with hash 132394318, now seen corresponding path program 1 times [2023-11-23 21:27:15,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:15,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946264351] [2023-11-23 21:27:15,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:15,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:15,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:16,920 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:16,920 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:16,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1946264351] [2023-11-23 21:27:16,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1946264351] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:16,921 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:16,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:27:16,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285473577] [2023-11-23 21:27:16,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:16,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:27:16,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:16,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:27:16,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:16,925 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:17,013 INFO L93 Difference]: Finished difference Result 52 states and 73 transitions. [2023-11-23 21:27:17,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:27:17,014 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 21:27:17,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:17,015 INFO L225 Difference]: With dead ends: 52 [2023-11-23 21:27:17,016 INFO L226 Difference]: Without dead ends: 35 [2023-11-23 21:27:17,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:27:17,018 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:17,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 45 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:17,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-23 21:27:17,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2023-11-23 21:27:17,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-11-23 21:27:17,029 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14 [2023-11-23 21:27:17,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:17,030 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-11-23 21:27:17,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,030 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-11-23 21:27:17,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 21:27:17,032 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:17,032 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:17,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 21:27:17,032 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:17,033 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:17,033 INFO L85 PathProgramCache]: Analyzing trace with hash -201717516, now seen corresponding path program 1 times [2023-11-23 21:27:17,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:17,033 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313543066] [2023-11-23 21:27:17,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:17,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:17,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:17,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:17,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:17,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313543066] [2023-11-23 21:27:17,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313543066] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:27:17,316 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:27:17,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:27:17,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303878582] [2023-11-23 21:27:17,316 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:27:17,317 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:27:17,317 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:27:17,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:27:17,318 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:27:17,318 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:27:17,424 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2023-11-23 21:27:17,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:27:17,425 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-23 21:27:17,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:27:17,426 INFO L225 Difference]: With dead ends: 57 [2023-11-23 21:27:17,426 INFO L226 Difference]: Without dead ends: 40 [2023-11-23 21:27:17,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:27:17,427 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 12 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:27:17,428 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 73 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:27:17,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-11-23 21:27:17,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2023-11-23 21:27:17,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2023-11-23 21:27:17,433 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15 [2023-11-23 21:27:17,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:27:17,433 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2023-11-23 21:27:17,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:27:17,434 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2023-11-23 21:27:17,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:27:17,435 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:27:17,435 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:27:17,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 21:27:17,435 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:27:17,436 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:27:17,436 INFO L85 PathProgramCache]: Analyzing trace with hash -28748075, now seen corresponding path program 1 times [2023-11-23 21:27:17,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:27:17,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940990440] [2023-11-23 21:27:17,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:17,437 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:27:17,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:20,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:20,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:27:20,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940990440] [2023-11-23 21:27:20,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940990440] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:27:20,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062729176] [2023-11-23 21:27:20,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:27:20,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:27:20,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:27:20,645 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:27:20,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ebf9365-1323-447c-9846-412038807bb8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:27:20,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:27:20,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-23 21:27:20,887 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:27:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:27:35,562 INFO L327 TraceCheckSpWp]: Computing backward predicates...