./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje --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 f5697d76d3e5ae232d0e056ee307ac88ca38e983a94c4765bc5d51f77e79d2f7 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 01:09:15,026 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 01:09:15,111 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 01:09:15,118 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 01:09:15,119 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 01:09:15,147 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 01:09:15,148 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 01:09:15,148 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 01:09:15,149 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 01:09:15,150 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 01:09:15,150 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 01:09:15,150 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 01:09:15,151 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 01:09:15,151 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 01:09:15,152 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 01:09:15,152 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 01:09:15,152 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 01:09:15,153 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 01:09:15,153 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 01:09:15,154 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 01:09:15,154 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 01:09:15,155 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 01:09:15,155 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 01:09:15,156 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 01:09:15,156 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 01:09:15,156 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 01:09:15,157 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 01:09:15,157 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 01:09:15,157 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 01:09:15,157 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 01:09:15,158 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 01:09:15,158 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 01:09:15,163 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 01:09:15,163 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 01:09:15,166 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 01:09:15,167 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 01:09:15,167 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 01:09:15,167 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 01:09:15,168 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 01:09:15,168 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 01:09:15,168 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 01:09:15,169 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 01:09:15,169 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 01:09:15,169 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 01:09:15,170 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 01:09:15,170 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 01:09:15,170 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 01:09:15,170 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_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f5697d76d3e5ae232d0e056ee307ac88ca38e983a94c4765bc5d51f77e79d2f7 [2024-11-09 01:09:15,447 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 01:09:15,486 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 01:09:15,490 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 01:09:15,493 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 01:09:15,493 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 01:09:15,494 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c Unable to find full path for "g++" [2024-11-09 01:09:17,565 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 01:09:17,740 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 01:09:17,740 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c [2024-11-09 01:09:17,748 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/data/039136bbe/df42900d9d27464db5d08560b30aadef/FLAG80ab06ccc [2024-11-09 01:09:18,123 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/data/039136bbe/df42900d9d27464db5d08560b30aadef [2024-11-09 01:09:18,126 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 01:09:18,127 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 01:09:18,128 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 01:09:18,128 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 01:09:18,132 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 01:09:18,133 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,134 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f5b3dfd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18, skipping insertion in model container [2024-11-09 01:09:18,134 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,153 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 01:09:18,332 WARN L250 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_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c[490,503] [2024-11-09 01:09:18,360 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 01:09:18,369 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 01:09:18,379 WARN L250 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_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_valuebound100.c[490,503] [2024-11-09 01:09:18,398 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 01:09:18,417 INFO L204 MainTranslator]: Completed translation [2024-11-09 01:09:18,417 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18 WrapperNode [2024-11-09 01:09:18,418 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 01:09:18,419 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 01:09:18,419 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 01:09:18,419 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 01:09:18,427 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,434 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,454 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 77 [2024-11-09 01:09:18,455 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 01:09:18,455 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 01:09:18,456 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 01:09:18,456 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 01:09:18,465 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,465 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,466 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,467 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,470 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,475 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,476 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,481 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,484 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 01:09:18,485 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 01:09:18,485 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 01:09:18,485 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 01:09:18,489 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (1/1) ... [2024-11-09 01:09:18,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 01:09:18,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:18,536 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 01:09:18,540 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 01:09:18,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 01:09:18,573 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-09 01:09:18,574 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-09 01:09:18,576 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 01:09:18,576 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 01:09:18,576 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 01:09:18,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-09 01:09:18,576 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-09 01:09:18,662 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 01:09:18,664 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 01:09:18,874 INFO L? ?]: Removed 11 outVars from TransFormulas that were not future-live. [2024-11-09 01:09:18,874 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 01:09:18,926 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 01:09:18,926 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-09 01:09:18,929 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 01:09:18 BoogieIcfgContainer [2024-11-09 01:09:18,929 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 01:09:18,934 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 01:09:18,934 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 01:09:18,939 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 01:09:18,939 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 01:09:18" (1/3) ... [2024-11-09 01:09:18,941 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efd221b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 01:09:18, skipping insertion in model container [2024-11-09 01:09:18,941 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 01:09:18" (2/3) ... [2024-11-09 01:09:18,960 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4efd221b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 01:09:18, skipping insertion in model container [2024-11-09 01:09:18,960 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 01:09:18" (3/3) ... [2024-11-09 01:09:18,962 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_valuebound100.c [2024-11-09 01:09:18,989 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 01:09:18,990 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 01:09:19,083 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 01:09:19,092 INFO L333 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, 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;@1416e878, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 01:09:19,092 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 01:09:19,097 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-09 01:09:19,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-09 01:09:19,106 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:19,106 INFO L215 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:09:19,107 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:19,113 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:19,114 INFO L85 PathProgramCache]: Analyzing trace with hash 1666051132, now seen corresponding path program 1 times [2024-11-09 01:09:19,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:19,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943483928] [2024-11-09 01:09:19,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:19,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:19,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:19,373 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-09 01:09:19,375 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:19,375 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943483928] [2024-11-09 01:09:19,376 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943483928] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:19,377 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:09:19,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-09 01:09:19,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574336829] [2024-11-09 01:09:19,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:19,386 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-09 01:09:19,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:19,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-09 01:09:19,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-09 01:09:19,419 INFO L87 Difference]: Start difference. First operand has 30 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2024-11-09 01:09:19,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:19,472 INFO L93 Difference]: Finished difference Result 49 states and 78 transitions. [2024-11-09 01:09:19,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-09 01:09:19,477 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 26 [2024-11-09 01:09:19,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:19,485 INFO L225 Difference]: With dead ends: 49 [2024-11-09 01:09:19,486 INFO L226 Difference]: Without dead ends: 28 [2024-11-09 01:09:19,490 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-09 01:09:19,494 INFO L432 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:19,495 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-09 01:09:19,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-09 01:09:19,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-09 01:09:19,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 15 states have internal predecessors, (16), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-09 01:09:19,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2024-11-09 01:09:19,540 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 26 [2024-11-09 01:09:19,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:19,543 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2024-11-09 01:09:19,543 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2024-11-09 01:09:19,544 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2024-11-09 01:09:19,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-09 01:09:19,546 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:19,546 INFO L215 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:09:19,547 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 01:09:19,547 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:19,548 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:19,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1875264981, now seen corresponding path program 1 times [2024-11-09 01:09:19,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:19,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690062162] [2024-11-09 01:09:19,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:19,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:19,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:19,854 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 01:09:19,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:19,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690062162] [2024-11-09 01:09:19,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690062162] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:09:19,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902115602] [2024-11-09 01:09:19,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:19,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:19,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:19,858 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:19,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 01:09:19,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:19,953 INFO L255 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-09 01:09:19,963 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:20,041 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 01:09:20,041 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:09:20,145 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 01:09:20,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902115602] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:09:20,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [24862711] [2024-11-09 01:09:20,180 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2024-11-09 01:09:20,180 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:09:20,186 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:09:20,195 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:09:20,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:09:21,567 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:09:21,570 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:09:22,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [24862711] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:22,277 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-09 01:09:22,277 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5, 5] total 14 [2024-11-09 01:09:22,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53425583] [2024-11-09 01:09:22,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:22,279 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-09 01:09:22,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:22,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-09 01:09:22,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2024-11-09 01:09:22,281 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2024-11-09 01:09:22,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:22,554 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2024-11-09 01:09:22,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 01:09:22,555 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2024-11-09 01:09:22,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:22,556 INFO L225 Difference]: With dead ends: 46 [2024-11-09 01:09:22,556 INFO L226 Difference]: Without dead ends: 38 [2024-11-09 01:09:22,557 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 67 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2024-11-09 01:09:22,558 INFO L432 NwaCegarLoop]: 21 mSDtfsCounter, 29 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:22,559 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 47 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 01:09:22,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2024-11-09 01:09:22,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2024-11-09 01:09:22,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2024-11-09 01:09:22,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2024-11-09 01:09:22,577 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 27 [2024-11-09 01:09:22,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:22,577 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2024-11-09 01:09:22,578 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2024-11-09 01:09:22,578 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2024-11-09 01:09:22,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-11-09 01:09:22,579 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:22,579 INFO L215 NwaCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:09:22,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-09 01:09:22,784 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:22,785 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:22,786 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:22,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1995645418, now seen corresponding path program 1 times [2024-11-09 01:09:22,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:22,787 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914006096] [2024-11-09 01:09:22,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:22,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:22,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:22,836 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [748196777] [2024-11-09 01:09:22,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:22,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:22,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:22,841 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:22,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 01:09:22,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:22,909 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-09 01:09:22,911 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:22,951 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-09 01:09:22,952 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 01:09:22,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:22,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914006096] [2024-11-09 01:09:22,953 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:22,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748196777] [2024-11-09 01:09:22,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748196777] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:22,953 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:09:22,953 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-09 01:09:22,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67718140] [2024-11-09 01:09:22,954 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:22,954 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 01:09:22,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:22,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 01:09:22,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-09 01:09:22,959 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2024-11-09 01:09:23,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:23,038 INFO L93 Difference]: Finished difference Result 43 states and 58 transitions. [2024-11-09 01:09:23,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 01:09:23,039 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 28 [2024-11-09 01:09:23,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:23,040 INFO L225 Difference]: With dead ends: 43 [2024-11-09 01:09:23,040 INFO L226 Difference]: Without dead ends: 41 [2024-11-09 01:09:23,040 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-09 01:09:23,041 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 4 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:23,042 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 117 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-09 01:09:23,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-09 01:09:23,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 36. [2024-11-09 01:09:23,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 21 states have internal predecessors, (22), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12) [2024-11-09 01:09:23,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2024-11-09 01:09:23,064 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 28 [2024-11-09 01:09:23,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:23,067 INFO L471 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2024-11-09 01:09:23,068 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2024-11-09 01:09:23,068 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2024-11-09 01:09:23,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-09 01:09:23,070 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:23,070 INFO L215 NwaCegarLoop]: trace histogram [6, 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] [2024-11-09 01:09:23,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-09 01:09:23,277 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:23,277 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:23,278 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:23,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1304708489, now seen corresponding path program 1 times [2024-11-09 01:09:23,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:23,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159097318] [2024-11-09 01:09:23,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:23,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:23,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:23,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [425033852] [2024-11-09 01:09:23,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:23,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:23,317 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:23,321 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:23,323 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 01:09:23,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:23,391 INFO L255 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-09 01:09:23,393 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:23,485 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-09 01:09:23,485 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 01:09:23,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:23,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159097318] [2024-11-09 01:09:23,486 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:23,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [425033852] [2024-11-09 01:09:23,487 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [425033852] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:23,487 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:09:23,487 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-09 01:09:23,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387705740] [2024-11-09 01:09:23,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:23,488 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 01:09:23,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:23,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 01:09:23,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-09 01:09:23,491 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-09 01:09:23,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:23,568 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2024-11-09 01:09:23,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 01:09:23,569 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 33 [2024-11-09 01:09:23,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:23,572 INFO L225 Difference]: With dead ends: 51 [2024-11-09 01:09:23,572 INFO L226 Difference]: Without dead ends: 49 [2024-11-09 01:09:23,572 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-09 01:09:23,573 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:23,574 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 127 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-09 01:09:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2024-11-09 01:09:23,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2024-11-09 01:09:23,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 25 states have (on average 1.16) internal successors, (29), 28 states have internal predecessors, (29), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2024-11-09 01:09:23,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 64 transitions. [2024-11-09 01:09:23,602 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 64 transitions. Word has length 33 [2024-11-09 01:09:23,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:23,603 INFO L471 AbstractCegarLoop]: Abstraction has 48 states and 64 transitions. [2024-11-09 01:09:23,603 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2024-11-09 01:09:23,603 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 64 transitions. [2024-11-09 01:09:23,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2024-11-09 01:09:23,604 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:23,607 INFO L215 NwaCegarLoop]: trace histogram [6, 3, 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] [2024-11-09 01:09:23,628 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-09 01:09:23,810 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:23,811 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:23,812 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:23,812 INFO L85 PathProgramCache]: Analyzing trace with hash 1794090422, now seen corresponding path program 1 times [2024-11-09 01:09:23,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:23,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730903858] [2024-11-09 01:09:23,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:23,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:23,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:23,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403034181] [2024-11-09 01:09:23,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:23,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:23,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:23,837 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:23,839 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 01:09:23,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:23,900 INFO L255 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 9 conjuncts are in the unsatisfiable core [2024-11-09 01:09:23,903 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:24,000 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2024-11-09 01:09:24,001 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 01:09:24,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:24,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730903858] [2024-11-09 01:09:24,003 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:24,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403034181] [2024-11-09 01:09:24,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403034181] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:24,003 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:09:24,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-09 01:09:24,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149842589] [2024-11-09 01:09:24,004 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:24,004 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 01:09:24,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:24,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 01:09:24,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-09 01:09:24,005 INFO L87 Difference]: Start difference. First operand 48 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-09 01:09:24,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:24,096 INFO L93 Difference]: Finished difference Result 55 states and 70 transitions. [2024-11-09 01:09:24,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 01:09:24,097 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 38 [2024-11-09 01:09:24,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:24,099 INFO L225 Difference]: With dead ends: 55 [2024-11-09 01:09:24,100 INFO L226 Difference]: Without dead ends: 53 [2024-11-09 01:09:24,101 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-09 01:09:24,102 INFO L432 NwaCegarLoop]: 33 mSDtfsCounter, 5 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:24,102 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 117 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 01:09:24,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-09 01:09:24,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2024-11-09 01:09:24,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 18 states have call successors, (18), 5 states have call predecessors, (18), 5 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2024-11-09 01:09:24,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2024-11-09 01:09:24,134 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 38 [2024-11-09 01:09:24,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:24,135 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2024-11-09 01:09:24,135 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-09 01:09:24,135 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2024-11-09 01:09:24,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-09 01:09:24,139 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:24,139 INFO L215 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:09:24,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-09 01:09:24,340 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:24,340 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:24,340 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:24,340 INFO L85 PathProgramCache]: Analyzing trace with hash -288919191, now seen corresponding path program 1 times [2024-11-09 01:09:24,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:24,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983670094] [2024-11-09 01:09:24,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:24,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:24,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:24,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [990945296] [2024-11-09 01:09:24,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:24,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:24,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:24,364 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:24,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 01:09:24,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:24,444 INFO L255 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-09 01:09:24,446 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:24,610 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2024-11-09 01:09:24,610 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-09 01:09:24,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:24,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983670094] [2024-11-09 01:09:24,611 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:24,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990945296] [2024-11-09 01:09:24,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990945296] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:09:24,611 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:09:24,611 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-09 01:09:24,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589404945] [2024-11-09 01:09:24,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:09:24,613 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 01:09:24,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:24,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 01:09:24,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-09 01:09:24,614 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2024-11-09 01:09:24,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:24,720 INFO L93 Difference]: Finished difference Result 59 states and 73 transitions. [2024-11-09 01:09:24,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 01:09:24,721 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 43 [2024-11-09 01:09:24,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:24,722 INFO L225 Difference]: With dead ends: 59 [2024-11-09 01:09:24,722 INFO L226 Difference]: Without dead ends: 57 [2024-11-09 01:09:24,722 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-09 01:09:24,723 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 5 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:24,723 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 114 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 01:09:24,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2024-11-09 01:09:24,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2024-11-09 01:09:24,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 34 states have internal predecessors, (35), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2024-11-09 01:09:24,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2024-11-09 01:09:24,752 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 43 [2024-11-09 01:09:24,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:24,753 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2024-11-09 01:09:24,753 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2024-11-09 01:09:24,754 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2024-11-09 01:09:24,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-09 01:09:24,755 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:24,756 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 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] [2024-11-09 01:09:24,778 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-09 01:09:24,956 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:24,957 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:24,958 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:24,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1763341077, now seen corresponding path program 1 times [2024-11-09 01:09:24,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:24,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214553946] [2024-11-09 01:09:24,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:24,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:24,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:24,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1884187623] [2024-11-09 01:09:24,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:24,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:24,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:25,003 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:25,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 01:09:25,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:25,066 INFO L255 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-09 01:09:25,068 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:25,140 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2024-11-09 01:09:25,141 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:09:25,262 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2024-11-09 01:09:25,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:25,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214553946] [2024-11-09 01:09:25,263 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:25,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884187623] [2024-11-09 01:09:25,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1884187623] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:09:25,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1277812764] [2024-11-09 01:09:25,266 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-09 01:09:25,269 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:09:25,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:09:25,270 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:09:25,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:09:28,313 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:09:28,319 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:09:28,321 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:09:30,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1850#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:09:30,367 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:09:30,367 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:09:30,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2024-11-09 01:09:30,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522341454] [2024-11-09 01:09:30,368 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:09:30,368 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 01:09:30,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:30,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 01:09:30,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2024-11-09 01:09:30,370 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2024-11-09 01:09:30,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:30,512 INFO L93 Difference]: Finished difference Result 84 states and 115 transitions. [2024-11-09 01:09:30,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-09 01:09:30,517 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 50 [2024-11-09 01:09:30,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:30,518 INFO L225 Difference]: With dead ends: 84 [2024-11-09 01:09:30,518 INFO L226 Difference]: Without dead ends: 82 [2024-11-09 01:09:30,519 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 119 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2024-11-09 01:09:30,520 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:30,520 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 194 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 01:09:30,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2024-11-09 01:09:30,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 52. [2024-11-09 01:09:30,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-09 01:09:30,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2024-11-09 01:09:30,546 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 50 [2024-11-09 01:09:30,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:30,547 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2024-11-09 01:09:30,547 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2024-11-09 01:09:30,547 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2024-11-09 01:09:30,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2024-11-09 01:09:30,548 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:30,548 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 4, 4, 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] [2024-11-09 01:09:30,563 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-09 01:09:30,748 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:30,749 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:30,749 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:30,749 INFO L85 PathProgramCache]: Analyzing trace with hash -139533089, now seen corresponding path program 1 times [2024-11-09 01:09:30,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:30,750 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057195012] [2024-11-09 01:09:30,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:30,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:30,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:30,928 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 01:09:30,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:30,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057195012] [2024-11-09 01:09:30,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057195012] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:09:30,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784880235] [2024-11-09 01:09:30,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:30,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:30,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:30,932 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:30,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 01:09:30,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:30,987 INFO L255 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-09 01:09:30,989 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:31,042 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 01:09:31,042 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:09:31,142 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 01:09:31,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784880235] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:09:31,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336063263] [2024-11-09 01:09:31,145 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:09:31,146 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:09:31,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:09:31,146 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:09:31,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:09:34,807 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:09:34,813 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:09:34,816 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:09:37,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2405#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:09:37,748 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:09:37,749 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 01:09:37,749 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2024-11-09 01:09:37,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686556539] [2024-11-09 01:09:37,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 01:09:37,749 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 01:09:37,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:37,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 01:09:37,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=373, Unknown=0, NotChecked=0, Total=506 [2024-11-09 01:09:37,751 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2024-11-09 01:09:37,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:37,969 INFO L93 Difference]: Finished difference Result 99 states and 139 transitions. [2024-11-09 01:09:37,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-09 01:09:37,969 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2024-11-09 01:09:37,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:37,971 INFO L225 Difference]: With dead ends: 99 [2024-11-09 01:09:37,971 INFO L226 Difference]: Without dead ends: 91 [2024-11-09 01:09:37,971 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 131 SyntacticMatches, 9 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2024-11-09 01:09:37,972 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 32 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:37,973 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 204 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 01:09:37,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2024-11-09 01:09:38,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 82. [2024-11-09 01:09:38,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 43 states have (on average 1.2093023255813953) internal successors, (52), 44 states have internal predecessors, (52), 32 states have call successors, (32), 6 states have call predecessors, (32), 6 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2024-11-09 01:09:38,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 115 transitions. [2024-11-09 01:09:38,003 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 115 transitions. Word has length 52 [2024-11-09 01:09:38,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:38,004 INFO L471 AbstractCegarLoop]: Abstraction has 82 states and 115 transitions. [2024-11-09 01:09:38,004 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2024-11-09 01:09:38,004 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 115 transitions. [2024-11-09 01:09:38,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2024-11-09 01:09:38,005 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:38,005 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 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] [2024-11-09 01:09:38,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-09 01:09:38,206 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:38,206 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:38,207 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:38,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1467479315, now seen corresponding path program 1 times [2024-11-09 01:09:38,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:38,207 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212784037] [2024-11-09 01:09:38,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:38,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:38,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:38,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [471766203] [2024-11-09 01:09:38,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:38,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:38,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:38,237 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:38,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 01:09:38,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:09:38,305 INFO L255 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 39 conjuncts are in the unsatisfiable core [2024-11-09 01:09:38,307 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:38,652 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2024-11-09 01:09:38,653 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:09:39,004 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2024-11-09 01:09:39,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:09:39,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212784037] [2024-11-09 01:09:39,005 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:09:39,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471766203] [2024-11-09 01:09:39,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471766203] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:09:39,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919417706] [2024-11-09 01:09:39,008 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:09:39,008 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:09:39,009 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:09:39,009 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:09:39,009 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:09:42,390 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:09:42,397 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:09:42,405 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:09:45,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3091#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:09:45,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:09:45,701 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:09:45,701 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 20 [2024-11-09 01:09:45,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618171019] [2024-11-09 01:09:45,702 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:09:45,702 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 01:09:45,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:09:45,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 01:09:45,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1046, Unknown=0, NotChecked=0, Total=1260 [2024-11-09 01:09:45,704 INFO L87 Difference]: Start difference. First operand 82 states and 115 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 10 states have call successors, (20) [2024-11-09 01:09:47,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:09:47,032 INFO L93 Difference]: Finished difference Result 114 states and 158 transitions. [2024-11-09 01:09:47,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-09 01:09:47,033 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 10 states have call successors, (20) Word has length 58 [2024-11-09 01:09:47,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:09:47,035 INFO L225 Difference]: With dead ends: 114 [2024-11-09 01:09:47,035 INFO L226 Difference]: Without dead ends: 111 [2024-11-09 01:09:47,036 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 132 SyntacticMatches, 6 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 653 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=302, Invalid=1504, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 01:09:47,037 INFO L432 NwaCegarLoop]: 24 mSDtfsCounter, 55 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 01:09:47,037 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 245 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 01:09:47,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2024-11-09 01:09:47,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 100. [2024-11-09 01:09:47,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 57 states have internal predecessors, (63), 37 states have call successors, (37), 8 states have call predecessors, (37), 8 states have return successors, (36), 34 states have call predecessors, (36), 36 states have call successors, (36) [2024-11-09 01:09:47,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 136 transitions. [2024-11-09 01:09:47,091 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 136 transitions. Word has length 58 [2024-11-09 01:09:47,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:09:47,091 INFO L471 AbstractCegarLoop]: Abstraction has 100 states and 136 transitions. [2024-11-09 01:09:47,091 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 10 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 10 states have call successors, (20) [2024-11-09 01:09:47,092 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 136 transitions. [2024-11-09 01:09:47,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2024-11-09 01:09:47,093 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:09:47,093 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 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] [2024-11-09 01:09:47,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-09 01:09:47,293 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:47,294 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:09:47,294 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:09:47,294 INFO L85 PathProgramCache]: Analyzing trace with hash 1312078963, now seen corresponding path program 2 times [2024-11-09 01:09:47,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:09:47,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329388399] [2024-11-09 01:09:47,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:09:47,295 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:09:47,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:09:47,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [795792030] [2024-11-09 01:09:47,341 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:09:47,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:09:47,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:09:47,345 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:09:47,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 01:09:47,483 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:09:47,483 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:09:47,485 INFO L255 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 54 conjuncts are in the unsatisfiable core [2024-11-09 01:09:47,487 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:09:48,552 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 40 proven. 19 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2024-11-09 01:09:48,552 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:09:52,238 WARN L873 $PredicateComparison]: unable to prove that (let ((.cse0 (+ (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|))) (.cse1 (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (.cse2 (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|))) (or (not (= (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1|) (* |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~b~0#1|)) (+ (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1|) |c_ULTIMATE.start_main_~b~0#1|))) (= .cse0 (+ .cse1 .cse2)) (not (= .cse0 (+ |c_ULTIMATE.start_main_~c~0#1| .cse1 .cse2))) (= (+ (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~r~0#1|) (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~p~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|)) (+ (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~r~0#1|) (* |c_ULTIMATE.start_main_~xy~0#1| |c_ULTIMATE.start_main_~k~0#1| |c_ULTIMATE.start_main_~q~0#1|) (* |c_ULTIMATE.start_main_~y~0#1| |c_ULTIMATE.start_main_~x~0#1| |c_ULTIMATE.start_main_~p~0#1|) (* |c_ULTIMATE.start_main_~yy~0#1| |c_ULTIMATE.start_main_~s~0#1| |c_ULTIMATE.start_main_~k~0#1|))) (< |c_ULTIMATE.start_main_~b~0#1| (+ |c_ULTIMATE.start_main_~c~0#1| 1)))) is different from true [2024-11-09 01:10:00,991 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:10:00,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329388399] [2024-11-09 01:10:00,992 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:10:00,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795792030] [2024-11-09 01:10:00,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795792030] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:10:00,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1389289423] [2024-11-09 01:10:00,994 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:10:00,994 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:10:00,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:10:00,995 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:10:00,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:10:03,731 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:10:03,735 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:10:03,736 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:10:08,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3844#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:10:08,158 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:10:08,158 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:10:08,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2024-11-09 01:10:08,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455123379] [2024-11-09 01:10:08,159 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:10:08,159 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-09 01:10:08,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:10:08,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-09 01:10:08,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1303, Unknown=1, NotChecked=76, Total=1640 [2024-11-09 01:10:08,161 INFO L87 Difference]: Start difference. First operand 100 states and 136 transitions. Second operand has 15 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2024-11-09 01:10:09,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:10:09,029 INFO L93 Difference]: Finished difference Result 121 states and 162 transitions. [2024-11-09 01:10:09,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 01:10:09,030 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) Word has length 68 [2024-11-09 01:10:09,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:10:09,031 INFO L225 Difference]: With dead ends: 121 [2024-11-09 01:10:09,031 INFO L226 Difference]: Without dead ends: 119 [2024-11-09 01:10:09,032 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 136 SyntacticMatches, 8 SemanticMatches, 44 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 751 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=325, Invalid=1658, Unknown=1, NotChecked=86, Total=2070 [2024-11-09 01:10:09,033 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 37 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 01:10:09,033 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 137 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 01:10:09,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2024-11-09 01:10:09,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 116. [2024-11-09 01:10:09,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 65 states have internal predecessors, (74), 42 states have call successors, (42), 10 states have call predecessors, (42), 10 states have return successors, (41), 40 states have call predecessors, (41), 41 states have call successors, (41) [2024-11-09 01:10:09,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 157 transitions. [2024-11-09 01:10:09,093 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 157 transitions. Word has length 68 [2024-11-09 01:10:09,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:10:09,094 INFO L471 AbstractCegarLoop]: Abstraction has 116 states and 157 transitions. [2024-11-09 01:10:09,094 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2024-11-09 01:10:09,094 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 157 transitions. [2024-11-09 01:10:09,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-09 01:10:09,095 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:10:09,096 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 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] [2024-11-09 01:10:09,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-09 01:10:09,296 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-09 01:10:09,296 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:10:09,297 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:10:09,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1499278558, now seen corresponding path program 1 times [2024-11-09 01:10:09,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:10:09,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065384685] [2024-11-09 01:10:09,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:09,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:10:09,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:10:09,318 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [3484653] [2024-11-09 01:10:09,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:09,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:10:09,319 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:10:09,320 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:10:09,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 01:10:09,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:10:09,408 INFO L255 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 39 conjuncts are in the unsatisfiable core [2024-11-09 01:10:09,410 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:10:09,958 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 18 proven. 11 refuted. 0 times theorem prover too weak. 137 trivial. 0 not checked. [2024-11-09 01:10:09,958 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:10:11,051 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2024-11-09 01:10:11,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:10:11,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065384685] [2024-11-09 01:10:11,051 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:10:11,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3484653] [2024-11-09 01:10:11,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3484653] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:10:11,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1507419051] [2024-11-09 01:10:11,054 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:10:11,054 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:10:11,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:10:11,059 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:10:11,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:10:12,260 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,261 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,300 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,301 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,354 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,355 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,440 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,441 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,754 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,755 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,904 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:12,905 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:13,282 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:10:13,287 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:10:13,288 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:10:20,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4717#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:10:20,856 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:10:20,856 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:10:20,856 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2024-11-09 01:10:20,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073469964] [2024-11-09 01:10:20,856 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:10:20,857 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 01:10:20,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:10:20,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 01:10:20,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=1437, Unknown=0, NotChecked=0, Total=1640 [2024-11-09 01:10:20,858 INFO L87 Difference]: Start difference. First operand 116 states and 157 transitions. Second operand has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2024-11-09 01:10:24,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:10:24,817 INFO L93 Difference]: Finished difference Result 201 states and 289 transitions. [2024-11-09 01:10:24,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-09 01:10:24,817 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) Word has length 74 [2024-11-09 01:10:24,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:10:24,819 INFO L225 Difference]: With dead ends: 201 [2024-11-09 01:10:24,819 INFO L226 Difference]: Without dead ends: 197 [2024-11-09 01:10:24,821 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 237 GetRequests, 171 SyntacticMatches, 10 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1291 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=414, Invalid=2892, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 01:10:24,821 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 78 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:10:24,822 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 404 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 522 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2024-11-09 01:10:24,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2024-11-09 01:10:24,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 193. [2024-11-09 01:10:24,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 100 states have (on average 1.21) internal successors, (121), 101 states have internal predecessors, (121), 79 states have call successors, (79), 13 states have call predecessors, (79), 13 states have return successors, (78), 78 states have call predecessors, (78), 78 states have call successors, (78) [2024-11-09 01:10:24,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 278 transitions. [2024-11-09 01:10:24,914 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 278 transitions. Word has length 74 [2024-11-09 01:10:24,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:10:24,914 INFO L471 AbstractCegarLoop]: Abstraction has 193 states and 278 transitions. [2024-11-09 01:10:24,915 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 10 states have call successors, (27), 3 states have call predecessors, (27), 2 states have return successors, (26), 8 states have call predecessors, (26), 8 states have call successors, (26) [2024-11-09 01:10:24,915 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 278 transitions. [2024-11-09 01:10:24,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-09 01:10:24,917 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:10:24,917 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 10, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:10:24,932 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2024-11-09 01:10:25,120 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-09 01:10:25,121 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:10:25,121 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:10:25,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1182695818, now seen corresponding path program 3 times [2024-11-09 01:10:25,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:10:25,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956431821] [2024-11-09 01:10:25,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:25,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:10:25,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:10:25,289 INFO L134 CoverageAnalysis]: Checked inductivity of 251 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2024-11-09 01:10:25,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:10:25,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956431821] [2024-11-09 01:10:25,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956431821] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 01:10:25,289 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 01:10:25,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-09 01:10:25,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461104507] [2024-11-09 01:10:25,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 01:10:25,290 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-09 01:10:25,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:10:25,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-09 01:10:25,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-09 01:10:25,291 INFO L87 Difference]: Start difference. First operand 193 states and 278 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2024-11-09 01:10:25,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:10:25,461 INFO L93 Difference]: Finished difference Result 246 states and 350 transitions. [2024-11-09 01:10:25,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-09 01:10:25,462 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 88 [2024-11-09 01:10:25,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:10:25,464 INFO L225 Difference]: With dead ends: 246 [2024-11-09 01:10:25,464 INFO L226 Difference]: Without dead ends: 174 [2024-11-09 01:10:25,465 INFO L431 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 [2024-11-09 01:10:25,465 INFO L432 NwaCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:10:25,467 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 146 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 01:10:25,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2024-11-09 01:10:25,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 160. [2024-11-09 01:10:25,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 83 states have (on average 1.1566265060240963) internal successors, (96), 84 states have internal predecessors, (96), 63 states have call successors, (63), 13 states have call predecessors, (63), 13 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2024-11-09 01:10:25,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 221 transitions. [2024-11-09 01:10:25,559 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 221 transitions. Word has length 88 [2024-11-09 01:10:25,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:10:25,560 INFO L471 AbstractCegarLoop]: Abstraction has 160 states and 221 transitions. [2024-11-09 01:10:25,560 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 3 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2024-11-09 01:10:25,560 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 221 transitions. [2024-11-09 01:10:25,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2024-11-09 01:10:25,562 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:10:25,562 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:10:25,562 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2024-11-09 01:10:25,562 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:10:25,563 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:10:25,563 INFO L85 PathProgramCache]: Analyzing trace with hash 162080370, now seen corresponding path program 1 times [2024-11-09 01:10:25,563 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:10:25,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390900596] [2024-11-09 01:10:25,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:25,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:10:25,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:10:25,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1269289138] [2024-11-09 01:10:25,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:25,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:10:25,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:10:25,622 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:10:25,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 01:10:25,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:10:25,726 INFO L255 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 49 conjuncts are in the unsatisfiable core [2024-11-09 01:10:25,729 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:10:27,537 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 70 proven. 29 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2024-11-09 01:10:27,538 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:10:30,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:10:30,317 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390900596] [2024-11-09 01:10:30,317 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:10:30,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1269289138] [2024-11-09 01:10:30,318 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1269289138] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:10:30,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145119245] [2024-11-09 01:10:30,320 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:10:30,320 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:10:30,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:10:30,321 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:10:30,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:10:31,462 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,463 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,500 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,501 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,549 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,550 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,636 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,763 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:31,764 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:32,003 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:32,004 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:32,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:10:32,348 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:10:32,349 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:10:45,836 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6480#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:10:45,836 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:10:45,836 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:10:45,836 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2024-11-09 01:10:45,836 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143969236] [2024-11-09 01:10:45,836 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:10:45,837 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-09 01:10:45,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:10:45,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-09 01:10:45,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=1497, Unknown=1, NotChecked=0, Total=1722 [2024-11-09 01:10:45,838 INFO L87 Difference]: Start difference. First operand 160 states and 221 transitions. Second operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2024-11-09 01:10:46,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:10:46,922 INFO L93 Difference]: Finished difference Result 170 states and 230 transitions. [2024-11-09 01:10:46,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 01:10:46,923 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 90 [2024-11-09 01:10:46,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:10:46,924 INFO L225 Difference]: With dead ends: 170 [2024-11-09 01:10:46,925 INFO L226 Difference]: Without dead ends: 168 [2024-11-09 01:10:46,926 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 147 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1212 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=267, Invalid=1802, Unknown=1, NotChecked=0, Total=2070 [2024-11-09 01:10:46,927 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 30 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 390 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 01:10:46,927 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 185 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 390 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 01:10:46,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2024-11-09 01:10:47,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2024-11-09 01:10:47,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 86 states have (on average 1.1511627906976745) internal successors, (99), 87 states have internal predecessors, (99), 63 states have call successors, (63), 14 states have call predecessors, (63), 14 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2024-11-09 01:10:47,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 224 transitions. [2024-11-09 01:10:47,016 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 224 transitions. Word has length 90 [2024-11-09 01:10:47,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:10:47,017 INFO L471 AbstractCegarLoop]: Abstraction has 164 states and 224 transitions. [2024-11-09 01:10:47,017 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2024-11-09 01:10:47,017 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 224 transitions. [2024-11-09 01:10:47,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2024-11-09 01:10:47,019 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:10:47,019 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 6, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:10:47,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-11-09 01:10:47,222 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:10:47,223 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:10:47,223 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:10:47,223 INFO L85 PathProgramCache]: Analyzing trace with hash 388768494, now seen corresponding path program 2 times [2024-11-09 01:10:47,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:10:47,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312057382] [2024-11-09 01:10:47,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:10:47,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:10:47,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:10:47,277 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [523445374] [2024-11-09 01:10:47,277 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:10:47,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:10:47,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:10:47,279 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:10:47,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 01:10:47,387 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:10:47,387 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:10:47,388 INFO L255 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 43 conjuncts are in the unsatisfiable core [2024-11-09 01:10:47,391 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:10:47,928 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 33 proven. 32 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2024-11-09 01:10:47,928 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:10:48,507 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 394 trivial. 0 not checked. [2024-11-09 01:10:48,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:10:48,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312057382] [2024-11-09 01:10:48,507 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:10:48,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [523445374] [2024-11-09 01:10:48,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [523445374] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:10:48,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [814482684] [2024-11-09 01:10:48,510 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:10:48,510 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:10:48,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:10:48,511 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:10:48,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:10:49,643 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,644 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,668 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,668 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,702 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,702 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,746 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,746 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,858 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,858 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,859 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,859 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,889 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,889 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,937 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:49,937 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,010 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,011 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,166 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,167 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,167 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,168 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,215 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,215 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,252 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,252 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,305 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,305 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:10:50,671 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:10:50,675 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:10:50,677 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:11:03,899 WARN L286 SmtUtils]: Spent 11.85s on a formula simplification. DAG size of input: 104 DAG size of output: 94 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:11:10,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7714#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:11:10,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:11:10,988 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:11:10,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2024-11-09 01:11:10,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628152731] [2024-11-09 01:11:10,989 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:11:10,989 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 01:11:10,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:11:10,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 01:11:10,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1100, Unknown=0, NotChecked=0, Total=1260 [2024-11-09 01:11:10,991 INFO L87 Difference]: Start difference. First operand 164 states and 224 transitions. Second operand has 17 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2024-11-09 01:11:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:11:12,796 INFO L93 Difference]: Finished difference Result 195 states and 268 transitions. [2024-11-09 01:11:12,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-09 01:11:12,796 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) Word has length 107 [2024-11-09 01:11:12,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:11:12,798 INFO L225 Difference]: With dead ends: 195 [2024-11-09 01:11:12,799 INFO L226 Difference]: Without dead ends: 193 [2024-11-09 01:11:12,805 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 265 SyntacticMatches, 20 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1026 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=250, Invalid=1730, Unknown=0, NotChecked=0, Total=1980 [2024-11-09 01:11:12,806 INFO L432 NwaCegarLoop]: 38 mSDtfsCounter, 41 mSDsluCounter, 298 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 336 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2024-11-09 01:11:12,810 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 336 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2024-11-09 01:11:12,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2024-11-09 01:11:12,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 168. [2024-11-09 01:11:12,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 89 states have (on average 1.146067415730337) internal successors, (102), 90 states have internal predecessors, (102), 63 states have call successors, (63), 15 states have call predecessors, (63), 15 states have return successors, (62), 62 states have call predecessors, (62), 62 states have call successors, (62) [2024-11-09 01:11:12,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 227 transitions. [2024-11-09 01:11:12,946 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 227 transitions. Word has length 107 [2024-11-09 01:11:12,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:11:12,946 INFO L471 AbstractCegarLoop]: Abstraction has 168 states and 227 transitions. [2024-11-09 01:11:12,946 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.375) internal successors, (38), 15 states have internal predecessors, (38), 11 states have call successors, (38), 3 states have call predecessors, (38), 2 states have return successors, (36), 11 states have call predecessors, (36), 11 states have call successors, (36) [2024-11-09 01:11:12,947 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 227 transitions. [2024-11-09 01:11:12,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2024-11-09 01:11:12,948 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:11:12,948 INFO L215 NwaCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:11:12,953 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2024-11-09 01:11:13,149 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-09 01:11:13,149 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:11:13,149 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:11:13,149 INFO L85 PathProgramCache]: Analyzing trace with hash 895514417, now seen corresponding path program 3 times [2024-11-09 01:11:13,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:11:13,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31353105] [2024-11-09 01:11:13,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:11:13,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:11:13,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:11:13,215 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [599537309] [2024-11-09 01:11:13,215 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:11:13,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:11:13,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:11:13,217 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:11:13,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 01:11:13,325 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:11:13,325 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:11:13,326 INFO L255 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-09 01:11:13,329 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:11:15,579 INFO L134 CoverageAnalysis]: Checked inductivity of 515 backedges. 91 proven. 52 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2024-11-09 01:11:15,580 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:11:15,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:11:15,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31353105] [2024-11-09 01:11:15,791 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:11:15,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599537309] [2024-11-09 01:11:15,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599537309] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:11:15,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1489471533] [2024-11-09 01:11:15,794 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:11:15,794 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:11:15,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:11:15,794 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:11:15,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:11:16,760 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,760 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,785 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,785 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,818 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,818 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,875 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:16,876 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:17,059 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:17,060 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:17,243 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:17,243 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:17,499 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:11:17,505 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:11:17,507 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:11:24,273 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8719#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:11:24,274 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:11:24,274 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:11:24,274 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2024-11-09 01:11:24,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920309024] [2024-11-09 01:11:24,274 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:11:24,275 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2024-11-09 01:11:24,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:11:24,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2024-11-09 01:11:24,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 01:11:24,276 INFO L87 Difference]: Start difference. First operand 168 states and 227 transitions. Second operand has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2024-11-09 01:11:25,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:11:25,672 INFO L93 Difference]: Finished difference Result 203 states and 274 transitions. [2024-11-09 01:11:25,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 01:11:25,672 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) Word has length 112 [2024-11-09 01:11:25,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:11:25,674 INFO L225 Difference]: With dead ends: 203 [2024-11-09 01:11:25,674 INFO L226 Difference]: Without dead ends: 201 [2024-11-09 01:11:25,675 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 174 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 912 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=179, Invalid=1381, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 01:11:25,676 INFO L432 NwaCegarLoop]: 46 mSDtfsCounter, 18 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:11:25,676 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 409 Invalid, 510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 01:11:25,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2024-11-09 01:11:25,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 175. [2024-11-09 01:11:25,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 95 states have internal predecessors, (106), 66 states have call successors, (66), 15 states have call predecessors, (66), 15 states have return successors, (65), 64 states have call predecessors, (65), 65 states have call successors, (65) [2024-11-09 01:11:25,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 237 transitions. [2024-11-09 01:11:25,785 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 237 transitions. Word has length 112 [2024-11-09 01:11:25,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:11:25,785 INFO L471 AbstractCegarLoop]: Abstraction has 175 states and 237 transitions. [2024-11-09 01:11:25,786 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 12 states have internal predecessors, (25), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 7 states have call predecessors, (21), 7 states have call successors, (21) [2024-11-09 01:11:25,786 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 237 transitions. [2024-11-09 01:11:25,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2024-11-09 01:11:25,788 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:11:25,788 INFO L215 NwaCegarLoop]: trace histogram [16, 15, 15, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:11:25,808 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-09 01:11:25,988 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:11:25,989 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:11:25,989 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:11:25,989 INFO L85 PathProgramCache]: Analyzing trace with hash 1441975848, now seen corresponding path program 4 times [2024-11-09 01:11:25,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:11:25,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889918062] [2024-11-09 01:11:25,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:11:25,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:11:26,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:11:26,019 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [360749357] [2024-11-09 01:11:26,019 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:11:26,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:11:26,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:11:26,022 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:11:26,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 01:11:26,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:11:26,154 INFO L255 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 45 conjuncts are in the unsatisfiable core [2024-11-09 01:11:26,157 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:11:28,411 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 78 proven. 75 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2024-11-09 01:11:28,411 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:11:28,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:11:28,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889918062] [2024-11-09 01:11:28,767 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:11:28,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360749357] [2024-11-09 01:11:28,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360749357] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:11:28,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2068030084] [2024-11-09 01:11:28,769 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:11:28,769 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:11:28,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:11:28,770 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:11:28,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:11:29,721 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,722 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,746 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,746 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,785 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,785 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,828 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,829 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,926 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:29,927 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:30,094 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:30,094 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:30,364 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:11:30,368 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:11:30,369 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:11:38,564 WARN L286 SmtUtils]: Spent 6.20s on a formula simplification. DAG size of input: 98 DAG size of output: 90 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:11:42,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9750#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:11:42,129 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:11:42,129 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:11:42,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2024-11-09 01:11:42,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722907715] [2024-11-09 01:11:42,130 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:11:42,130 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-09 01:11:42,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:11:42,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-09 01:11:42,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 01:11:42,131 INFO L87 Difference]: Start difference. First operand 175 states and 237 transitions. Second operand has 18 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 9 states have call predecessors, (21), 7 states have call successors, (21) [2024-11-09 01:11:44,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:11:44,292 INFO L93 Difference]: Finished difference Result 211 states and 285 transitions. [2024-11-09 01:11:44,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 01:11:44,293 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 9 states have call predecessors, (21), 7 states have call successors, (21) Word has length 115 [2024-11-09 01:11:44,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:11:44,296 INFO L225 Difference]: With dead ends: 211 [2024-11-09 01:11:44,296 INFO L226 Difference]: Without dead ends: 209 [2024-11-09 01:11:44,297 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 175 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=225, Invalid=1845, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 01:11:44,297 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 39 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-11-09 01:11:44,298 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 255 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-11-09 01:11:44,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2024-11-09 01:11:44,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 175. [2024-11-09 01:11:44,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 95 states have internal predecessors, (106), 66 states have call successors, (66), 15 states have call predecessors, (66), 15 states have return successors, (65), 64 states have call predecessors, (65), 65 states have call successors, (65) [2024-11-09 01:11:44,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 237 transitions. [2024-11-09 01:11:44,462 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 237 transitions. Word has length 115 [2024-11-09 01:11:44,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:11:44,462 INFO L471 AbstractCegarLoop]: Abstraction has 175 states and 237 transitions. [2024-11-09 01:11:44,463 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 9 states have call predecessors, (21), 7 states have call successors, (21) [2024-11-09 01:11:44,463 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 237 transitions. [2024-11-09 01:11:44,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2024-11-09 01:11:44,465 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:11:44,465 INFO L215 NwaCegarLoop]: trace histogram [17, 16, 16, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:11:44,487 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2024-11-09 01:11:44,669 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:11:44,670 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:11:44,670 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:11:44,670 INFO L85 PathProgramCache]: Analyzing trace with hash -883793197, now seen corresponding path program 2 times [2024-11-09 01:11:44,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:11:44,670 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [130423196] [2024-11-09 01:11:44,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:11:44,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:11:44,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:11:44,695 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301984323] [2024-11-09 01:11:44,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:11:44,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:11:44,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:11:44,697 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:11:44,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-09 01:11:44,829 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:11:44,830 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:11:44,831 INFO L255 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-09 01:11:44,833 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:11:46,509 INFO L134 CoverageAnalysis]: Checked inductivity of 585 backedges. 73 proven. 47 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2024-11-09 01:11:46,509 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:11:48,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:11:48,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [130423196] [2024-11-09 01:11:48,974 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:11:48,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301984323] [2024-11-09 01:11:48,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301984323] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:11:48,974 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [433198300] [2024-11-09 01:11:48,976 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:11:48,976 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:11:48,976 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:11:48,976 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:11:48,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:11:50,073 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,073 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,105 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,105 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,143 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,144 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,194 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,195 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,322 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,322 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,323 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,323 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,347 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,347 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,403 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,404 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,469 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,470 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,578 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,578 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,579 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,579 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,640 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,641 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,703 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,704 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,796 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:50,797 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:11:51,192 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:11:51,196 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:11:51,197 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:12:12,024 WARN L286 SmtUtils]: Spent 16.96s on a formula simplification. DAG size of input: 102 DAG size of output: 94 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:12:21,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10845#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:12:21,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:12:21,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:12:21,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2024-11-09 01:12:21,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120593887] [2024-11-09 01:12:21,540 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:12:21,540 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 01:12:21,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:12:21,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 01:12:21,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1532, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 01:12:21,542 INFO L87 Difference]: Start difference. First operand 175 states and 237 transitions. Second operand has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2024-11-09 01:12:24,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:12:24,512 INFO L93 Difference]: Finished difference Result 227 states and 305 transitions. [2024-11-09 01:12:24,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 01:12:24,513 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) Word has length 121 [2024-11-09 01:12:24,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:12:24,514 INFO L225 Difference]: With dead ends: 227 [2024-11-09 01:12:24,514 INFO L226 Difference]: Without dead ends: 220 [2024-11-09 01:12:24,515 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 195 SyntacticMatches, 20 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 33.5s TimeCoverageRelationStatistics Valid=249, Invalid=2201, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 01:12:24,516 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 29 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-11-09 01:12:24,516 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 544 Invalid, 661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-11-09 01:12:24,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2024-11-09 01:12:24,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 214. [2024-11-09 01:12:24,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 113 states have (on average 1.1415929203539823) internal successors, (129), 115 states have internal predecessors, (129), 82 states have call successors, (82), 18 states have call predecessors, (82), 18 states have return successors, (81), 80 states have call predecessors, (81), 81 states have call successors, (81) [2024-11-09 01:12:24,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 292 transitions. [2024-11-09 01:12:24,690 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 292 transitions. Word has length 121 [2024-11-09 01:12:24,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:12:24,691 INFO L471 AbstractCegarLoop]: Abstraction has 214 states and 292 transitions. [2024-11-09 01:12:24,691 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.8125) internal successors, (29), 15 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 7 states have call successors, (22) [2024-11-09 01:12:24,691 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 292 transitions. [2024-11-09 01:12:24,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2024-11-09 01:12:24,693 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:12:24,693 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:12:24,702 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-09 01:12:24,894 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-09 01:12:24,894 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:12:24,895 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:12:24,895 INFO L85 PathProgramCache]: Analyzing trace with hash -2000871760, now seen corresponding path program 5 times [2024-11-09 01:12:24,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:12:24,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798447343] [2024-11-09 01:12:24,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:12:24,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:12:24,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:12:24,935 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1833629520] [2024-11-09 01:12:24,935 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:12:24,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:12:24,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:12:24,937 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:12:24,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-09 01:12:25,047 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:12:25,047 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:12:25,049 INFO L255 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 59 conjuncts are in the unsatisfiable core [2024-11-09 01:12:25,054 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:12:27,813 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 170 proven. 61 refuted. 0 times theorem prover too weak. 579 trivial. 0 not checked. [2024-11-09 01:12:27,813 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:12:35,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:12:35,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798447343] [2024-11-09 01:12:35,893 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:12:35,893 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833629520] [2024-11-09 01:12:35,894 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833629520] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:12:35,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [483855459] [2024-11-09 01:12:35,895 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:12:35,895 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:12:35,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:12:35,896 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:12:35,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:12:36,766 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,766 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,787 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,788 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,817 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,817 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,859 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,860 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,979 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:36,979 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:37,476 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:12:37,480 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:12:37,482 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:12:50,132 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12113#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:12:50,132 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:12:50,133 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:12:50,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2024-11-09 01:12:50,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584599419] [2024-11-09 01:12:50,133 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:12:50,133 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2024-11-09 01:12:50,133 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:12:50,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2024-11-09 01:12:50,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1725, Unknown=2, NotChecked=0, Total=1980 [2024-11-09 01:12:50,135 INFO L87 Difference]: Start difference. First operand 214 states and 292 transitions. Second operand has 18 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 9 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 8 states have call successors, (17) [2024-11-09 01:12:51,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:12:51,689 INFO L93 Difference]: Finished difference Result 292 states and 392 transitions. [2024-11-09 01:12:51,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-09 01:12:51,689 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 9 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 8 states have call successors, (17) Word has length 134 [2024-11-09 01:12:51,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:12:51,692 INFO L225 Difference]: With dead ends: 292 [2024-11-09 01:12:51,692 INFO L226 Difference]: Without dead ends: 290 [2024-11-09 01:12:51,693 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 18.0s TimeCoverageRelationStatistics Valid=304, Invalid=2046, Unknown=2, NotChecked=0, Total=2352 [2024-11-09 01:12:51,693 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 32 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:12:51,694 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 189 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 01:12:51,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 290 states. [2024-11-09 01:12:51,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 290 to 229. [2024-11-09 01:12:51,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 125 states have (on average 1.136) internal successors, (142), 127 states have internal predecessors, (142), 82 states have call successors, (82), 21 states have call predecessors, (82), 21 states have return successors, (81), 80 states have call predecessors, (81), 81 states have call successors, (81) [2024-11-09 01:12:51,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 305 transitions. [2024-11-09 01:12:51,924 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 305 transitions. Word has length 134 [2024-11-09 01:12:51,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:12:51,924 INFO L471 AbstractCegarLoop]: Abstraction has 229 states and 305 transitions. [2024-11-09 01:12:51,924 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 9 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (17), 8 states have call predecessors, (17), 8 states have call successors, (17) [2024-11-09 01:12:51,925 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 305 transitions. [2024-11-09 01:12:51,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-09 01:12:51,927 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:12:51,928 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:12:51,949 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-09 01:12:52,128 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-09 01:12:52,129 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:12:52,129 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:12:52,130 INFO L85 PathProgramCache]: Analyzing trace with hash 1327878759, now seen corresponding path program 6 times [2024-11-09 01:12:52,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:12:52,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1103519019] [2024-11-09 01:12:52,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:12:52,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:12:52,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:12:52,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1301144170] [2024-11-09 01:12:52,171 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:12:52,171 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:12:52,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:12:52,175 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:12:52,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-09 01:12:52,284 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:12:52,285 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:12:52,287 INFO L255 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-09 01:12:52,290 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:12:54,215 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 99 proven. 109 refuted. 0 times theorem prover too weak. 607 trivial. 0 not checked. [2024-11-09 01:12:54,216 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:12:54,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:12:54,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1103519019] [2024-11-09 01:12:54,553 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:12:54,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301144170] [2024-11-09 01:12:54,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301144170] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:12:54,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337129414] [2024-11-09 01:12:54,555 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:12:54,555 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:12:54,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:12:54,556 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:12:54,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:12:55,429 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,429 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,460 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,461 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,490 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,491 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,542 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,542 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,640 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,640 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,784 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:55,784 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:12:56,103 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:12:56,108 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:12:56,109 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:13:04,482 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13450#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:13:04,482 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:13:04,482 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:13:04,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-09 01:13:04,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241142992] [2024-11-09 01:13:04,483 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:13:04,483 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 01:13:04,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:13:04,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 01:13:04,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1612, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 01:13:04,485 INFO L87 Difference]: Start difference. First operand 229 states and 305 transitions. Second operand has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 7 states have call successors, (25) [2024-11-09 01:13:06,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:13:06,519 INFO L93 Difference]: Finished difference Result 243 states and 317 transitions. [2024-11-09 01:13:06,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 01:13:06,519 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 7 states have call successors, (25) Word has length 137 [2024-11-09 01:13:06,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:13:06,521 INFO L225 Difference]: With dead ends: 243 [2024-11-09 01:13:06,521 INFO L226 Difference]: Without dead ends: 241 [2024-11-09 01:13:06,522 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 216 SyntacticMatches, 21 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1611 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=252, Invalid=2298, Unknown=0, NotChecked=0, Total=2550 [2024-11-09 01:13:06,523 INFO L432 NwaCegarLoop]: 45 mSDtfsCounter, 39 mSDsluCounter, 490 mSDsCounter, 0 mSdLazyCounter, 830 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2024-11-09 01:13:06,523 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 535 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 830 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2024-11-09 01:13:06,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2024-11-09 01:13:06,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 204. [2024-11-09 01:13:06,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 113 states have (on average 1.1327433628318584) internal successors, (128), 115 states have internal predecessors, (128), 70 states have call successors, (70), 20 states have call predecessors, (70), 20 states have return successors, (69), 68 states have call predecessors, (69), 69 states have call successors, (69) [2024-11-09 01:13:06,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 267 transitions. [2024-11-09 01:13:06,659 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 267 transitions. Word has length 137 [2024-11-09 01:13:06,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:13:06,660 INFO L471 AbstractCegarLoop]: Abstraction has 204 states and 267 transitions. [2024-11-09 01:13:06,660 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 7 states have call successors, (25) [2024-11-09 01:13:06,660 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 267 transitions. [2024-11-09 01:13:06,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2024-11-09 01:13:06,661 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:13:06,661 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:13:06,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-09 01:13:06,862 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:13:06,862 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:13:06,862 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:13:06,862 INFO L85 PathProgramCache]: Analyzing trace with hash 1094353481, now seen corresponding path program 7 times [2024-11-09 01:13:06,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:13:06,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22476776] [2024-11-09 01:13:06,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:13:06,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:13:06,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:13:06,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1254709819] [2024-11-09 01:13:06,904 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:13:06,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:13:06,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:13:06,907 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:13:06,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-09 01:13:07,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:13:07,020 INFO L255 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 68 conjuncts are in the unsatisfiable core [2024-11-09 01:13:07,023 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:13:08,948 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 169 proven. 81 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2024-11-09 01:13:08,948 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:13:09,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:13:09,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22476776] [2024-11-09 01:13:09,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:13:09,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254709819] [2024-11-09 01:13:09,148 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254709819] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:13:09,148 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1368900569] [2024-11-09 01:13:09,149 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:13:09,150 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:13:09,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:13:09,150 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:13:09,150 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:13:10,092 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,093 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,129 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,130 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,172 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,173 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,216 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,216 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,463 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:10,464 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:11,000 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:13:11,004 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:13:11,005 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:13:16,019 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14666#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:13:16,019 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:13:16,020 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:13:16,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2024-11-09 01:13:16,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569636719] [2024-11-09 01:13:16,020 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:13:16,020 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-09 01:13:16,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:13:16,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-09 01:13:16,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1466, Unknown=0, NotChecked=0, Total=1640 [2024-11-09 01:13:16,022 INFO L87 Difference]: Start difference. First operand 204 states and 267 transitions. Second operand has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 9 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 8 states have call successors, (25) [2024-11-09 01:13:17,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:13:17,858 INFO L93 Difference]: Finished difference Result 268 states and 355 transitions. [2024-11-09 01:13:17,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 01:13:17,859 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 9 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 8 states have call successors, (25) Word has length 137 [2024-11-09 01:13:17,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:13:17,861 INFO L225 Difference]: With dead ends: 268 [2024-11-09 01:13:17,862 INFO L226 Difference]: Without dead ends: 266 [2024-11-09 01:13:17,863 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 238 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 582 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=228, Invalid=2124, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 01:13:17,866 INFO L432 NwaCegarLoop]: 43 mSDtfsCounter, 37 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 466 SdHoareTripleChecker+Invalid, 794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:13:17,867 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 466 Invalid, 794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 753 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2024-11-09 01:13:17,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2024-11-09 01:13:18,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 262. [2024-11-09 01:13:18,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 143 states have (on average 1.132867132867133) internal successors, (162), 145 states have internal predecessors, (162), 94 states have call successors, (94), 24 states have call predecessors, (94), 24 states have return successors, (93), 92 states have call predecessors, (93), 93 states have call successors, (93) [2024-11-09 01:13:18,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 349 transitions. [2024-11-09 01:13:18,204 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 349 transitions. Word has length 137 [2024-11-09 01:13:18,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:13:18,205 INFO L471 AbstractCegarLoop]: Abstraction has 262 states and 349 transitions. [2024-11-09 01:13:18,205 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 15 states have internal predecessors, (31), 9 states have call successors, (26), 2 states have call predecessors, (26), 3 states have return successors, (25), 10 states have call predecessors, (25), 8 states have call successors, (25) [2024-11-09 01:13:18,205 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 349 transitions. [2024-11-09 01:13:18,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2024-11-09 01:13:18,207 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:13:18,207 INFO L215 NwaCegarLoop]: trace histogram [21, 20, 20, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:13:18,231 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2024-11-09 01:13:18,408 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:13:18,408 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:13:18,409 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:13:18,409 INFO L85 PathProgramCache]: Analyzing trace with hash 1265642843, now seen corresponding path program 3 times [2024-11-09 01:13:18,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:13:18,409 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028939264] [2024-11-09 01:13:18,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:13:18,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:13:18,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:13:18,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1909747861] [2024-11-09 01:13:18,444 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:13:18,444 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:13:18,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:13:18,447 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:13:18,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-09 01:13:18,565 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:13:18,565 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:13:18,572 INFO L255 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 48 conjuncts are in the unsatisfiable core [2024-11-09 01:13:18,576 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:13:19,849 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 43 proven. 64 refuted. 0 times theorem prover too weak. 785 trivial. 0 not checked. [2024-11-09 01:13:19,850 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:13:23,158 INFO L134 CoverageAnalysis]: Checked inductivity of 892 backedges. 40 proven. 62 refuted. 0 times theorem prover too weak. 790 trivial. 0 not checked. [2024-11-09 01:13:23,158 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:13:23,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028939264] [2024-11-09 01:13:23,159 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:13:23,159 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909747861] [2024-11-09 01:13:23,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909747861] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:13:23,159 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761251081] [2024-11-09 01:13:23,160 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:13:23,160 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:13:23,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:13:23,161 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:13:23,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:13:24,202 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,202 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,227 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,227 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,271 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,271 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,318 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,319 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,445 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,446 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,446 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,446 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,471 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,471 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,502 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,502 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,545 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,545 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,637 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,638 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,666 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,666 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,700 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,701 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,757 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,758 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:13:24,958 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:13:24,962 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:13:24,963 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:13:39,664 WARN L286 SmtUtils]: Spent 12.30s on a formula simplification. DAG size of input: 102 DAG size of output: 94 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:13:47,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16437#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:13:47,056 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:13:47,056 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:13:47,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13] total 26 [2024-11-09 01:13:47,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138466261] [2024-11-09 01:13:47,057 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:13:47,057 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 01:13:47,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:13:47,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 01:13:47,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1833, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 01:13:47,059 INFO L87 Difference]: Start difference. First operand 262 states and 349 transitions. Second operand has 26 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 15 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (49), 14 states have call predecessors, (49), 13 states have call successors, (49) [2024-11-09 01:13:55,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:13:55,668 INFO L93 Difference]: Finished difference Result 445 states and 654 transitions. [2024-11-09 01:13:55,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-09 01:13:55,669 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 15 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (49), 14 states have call predecessors, (49), 13 states have call successors, (49) Word has length 140 [2024-11-09 01:13:55,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:13:55,672 INFO L225 Difference]: With dead ends: 445 [2024-11-09 01:13:55,672 INFO L226 Difference]: Without dead ends: 437 [2024-11-09 01:13:55,673 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 352 SyntacticMatches, 22 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2758 ImplicationChecksByTransitivity, 27.7s TimeCoverageRelationStatistics Valid=875, Invalid=5445, Unknown=0, NotChecked=0, Total=6320 [2024-11-09 01:13:55,677 INFO L432 NwaCegarLoop]: 55 mSDtfsCounter, 134 mSDsluCounter, 576 mSDsCounter, 0 mSdLazyCounter, 1036 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 631 SdHoareTripleChecker+Invalid, 1238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 1036 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:13:55,678 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 631 Invalid, 1238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 1036 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2024-11-09 01:13:55,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2024-11-09 01:13:56,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 353. [2024-11-09 01:13:56,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 177 states have (on average 1.1807909604519775) internal successors, (209), 179 states have internal predecessors, (209), 150 states have call successors, (150), 25 states have call predecessors, (150), 25 states have return successors, (149), 148 states have call predecessors, (149), 149 states have call successors, (149) [2024-11-09 01:13:56,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 508 transitions. [2024-11-09 01:13:56,091 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 508 transitions. Word has length 140 [2024-11-09 01:13:56,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:13:56,091 INFO L471 AbstractCegarLoop]: Abstraction has 353 states and 508 transitions. [2024-11-09 01:13:56,091 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 23 states have internal predecessors, (44), 15 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (49), 14 states have call predecessors, (49), 13 states have call successors, (49) [2024-11-09 01:13:56,092 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 508 transitions. [2024-11-09 01:13:56,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2024-11-09 01:13:56,094 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:13:56,094 INFO L215 NwaCegarLoop]: trace histogram [21, 20, 20, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:13:56,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2024-11-09 01:13:56,294 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-09 01:13:56,294 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:13:56,295 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:13:56,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1876622290, now seen corresponding path program 4 times [2024-11-09 01:13:56,295 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:13:56,295 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38095301] [2024-11-09 01:13:56,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:13:56,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:13:56,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:13:56,340 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [986137944] [2024-11-09 01:13:56,340 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:13:56,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:13:56,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:13:56,342 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:13:56,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-09 01:13:56,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:13:56,472 INFO L255 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-09 01:13:56,476 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:13:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 95 proven. 74 refuted. 0 times theorem prover too weak. 728 trivial. 0 not checked. [2024-11-09 01:13:58,218 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:13:59,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:13:59,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38095301] [2024-11-09 01:13:59,470 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:13:59,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986137944] [2024-11-09 01:13:59,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986137944] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:13:59,470 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975771921] [2024-11-09 01:13:59,472 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:13:59,472 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:13:59,472 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:13:59,473 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:13:59,473 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:14:00,704 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,704 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,747 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,748 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,806 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,806 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,868 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:00,869 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:01,059 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:01,059 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:01,858 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:14:01,862 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:14:01,863 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:14:14,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18370#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:14:14,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:14:14,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:14:14,904 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2024-11-09 01:14:14,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6167883] [2024-11-09 01:14:14,904 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:14:14,905 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-09 01:14:14,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:14:14,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-09 01:14:14,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1794, Unknown=0, NotChecked=0, Total=1980 [2024-11-09 01:14:14,907 INFO L87 Difference]: Start difference. First operand 353 states and 508 transitions. Second operand has 19 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2024-11-09 01:14:17,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:14:17,271 INFO L93 Difference]: Finished difference Result 386 states and 555 transitions. [2024-11-09 01:14:17,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 01:14:17,275 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) Word has length 143 [2024-11-09 01:14:17,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:14:17,279 INFO L225 Difference]: With dead ends: 386 [2024-11-09 01:14:17,279 INFO L226 Difference]: Without dead ends: 379 [2024-11-09 01:14:17,281 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 255 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=242, Invalid=2514, Unknown=0, NotChecked=0, Total=2756 [2024-11-09 01:14:17,282 INFO L432 NwaCegarLoop]: 47 mSDtfsCounter, 47 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 799 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 799 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-11-09 01:14:17,283 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 398 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 799 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-11-09 01:14:17,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2024-11-09 01:14:17,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 353. [2024-11-09 01:14:17,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 177 states have (on average 1.1807909604519775) internal successors, (209), 179 states have internal predecessors, (209), 150 states have call successors, (150), 25 states have call predecessors, (150), 25 states have return successors, (149), 148 states have call predecessors, (149), 149 states have call successors, (149) [2024-11-09 01:14:17,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 508 transitions. [2024-11-09 01:14:17,986 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 508 transitions. Word has length 143 [2024-11-09 01:14:17,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:14:17,986 INFO L471 AbstractCegarLoop]: Abstraction has 353 states and 508 transitions. [2024-11-09 01:14:17,987 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 16 states have internal predecessors, (32), 10 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 9 states have call predecessors, (26), 9 states have call successors, (26) [2024-11-09 01:14:17,987 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 508 transitions. [2024-11-09 01:14:17,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2024-11-09 01:14:17,990 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:14:17,990 INFO L215 NwaCegarLoop]: trace histogram [21, 20, 20, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:14:18,017 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2024-11-09 01:14:18,190 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-09 01:14:18,191 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:14:18,191 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:14:18,191 INFO L85 PathProgramCache]: Analyzing trace with hash -1733248460, now seen corresponding path program 5 times [2024-11-09 01:14:18,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:14:18,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934135396] [2024-11-09 01:14:18,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:14:18,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:14:18,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:14:18,256 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1921769607] [2024-11-09 01:14:18,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:14:18,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:14:18,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:14:18,267 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:14:18,271 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-09 01:14:18,461 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:14:18,461 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:14:18,465 INFO L255 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 62 conjuncts are in the unsatisfiable core [2024-11-09 01:14:18,473 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:14:20,297 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 93 proven. 71 refuted. 0 times theorem prover too weak. 733 trivial. 0 not checked. [2024-11-09 01:14:20,297 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:14:24,565 INFO L134 CoverageAnalysis]: Checked inductivity of 897 backedges. 93 proven. 71 refuted. 0 times theorem prover too weak. 733 trivial. 0 not checked. [2024-11-09 01:14:24,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:14:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934135396] [2024-11-09 01:14:24,566 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:14:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921769607] [2024-11-09 01:14:24,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921769607] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:14:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1798091098] [2024-11-09 01:14:24,567 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:14:24,567 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:14:24,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:14:24,568 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:14:24,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:14:25,440 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,440 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,462 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,462 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,492 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,492 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,540 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,541 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,648 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,648 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,811 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:25,812 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:14:26,157 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:14:26,162 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:14:26,163 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:14:38,217 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20537#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:14:38,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:14:38,217 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:14:38,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 29 [2024-11-09 01:14:38,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715874303] [2024-11-09 01:14:38,218 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:14:38,218 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 01:14:38,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:14:38,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 01:14:38,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=2050, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 01:14:38,220 INFO L87 Difference]: Start difference. First operand 353 states and 508 transitions. Second operand has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 16 states have call successors, (50), 2 states have call predecessors, (50), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2024-11-09 01:14:44,950 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-09 01:14:47,125 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-09 01:14:59,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:14:59,255 INFO L93 Difference]: Finished difference Result 451 states and 651 transitions. [2024-11-09 01:14:59,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2024-11-09 01:14:59,256 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 16 states have call successors, (50), 2 states have call predecessors, (50), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) Word has length 143 [2024-11-09 01:14:59,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:14:59,260 INFO L225 Difference]: With dead ends: 451 [2024-11-09 01:14:59,261 INFO L226 Difference]: Without dead ends: 443 [2024-11-09 01:14:59,263 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 460 GetRequests, 351 SyntacticMatches, 29 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2717 ImplicationChecksByTransitivity, 25.1s TimeCoverageRelationStatistics Valid=1004, Invalid=5638, Unknown=0, NotChecked=0, Total=6642 [2024-11-09 01:14:59,263 INFO L432 NwaCegarLoop]: 60 mSDtfsCounter, 99 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 996 mSolverCounterSat, 205 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 1202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 996 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2024-11-09 01:14:59,264 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 673 Invalid, 1202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 996 Invalid, 1 Unknown, 0 Unchecked, 9.4s Time] [2024-11-09 01:14:59,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2024-11-09 01:15:00,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 365. [2024-11-09 01:15:00,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 365 states, 186 states have (on average 1.1612903225806452) internal successors, (216), 188 states have internal predecessors, (216), 150 states have call successors, (150), 28 states have call predecessors, (150), 28 states have return successors, (149), 148 states have call predecessors, (149), 149 states have call successors, (149) [2024-11-09 01:15:00,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 365 states to 365 states and 515 transitions. [2024-11-09 01:15:00,120 INFO L78 Accepts]: Start accepts. Automaton has 365 states and 515 transitions. Word has length 143 [2024-11-09 01:15:00,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:15:00,121 INFO L471 AbstractCegarLoop]: Abstraction has 365 states and 515 transitions. [2024-11-09 01:15:00,121 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 27 states have internal predecessors, (52), 16 states have call successors, (50), 2 states have call predecessors, (50), 2 states have return successors, (48), 14 states have call predecessors, (48), 14 states have call successors, (48) [2024-11-09 01:15:00,121 INFO L276 IsEmpty]: Start isEmpty. Operand 365 states and 515 transitions. [2024-11-09 01:15:00,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2024-11-09 01:15:00,124 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:15:00,125 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:15:00,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-09 01:15:00,328 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-11-09 01:15:00,329 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:15:00,329 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:15:00,329 INFO L85 PathProgramCache]: Analyzing trace with hash 414354790, now seen corresponding path program 8 times [2024-11-09 01:15:00,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:15:00,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141377994] [2024-11-09 01:15:00,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:15:00,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:15:00,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:15:00,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [35080803] [2024-11-09 01:15:00,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:15:00,372 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:15:00,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:15:00,375 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:15:00,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-09 01:15:00,634 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:15:00,635 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:15:00,637 INFO L255 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 47 conjuncts are in the unsatisfiable core [2024-11-09 01:15:00,640 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:15:05,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 134 proven. 57 refuted. 0 times theorem prover too weak. 989 trivial. 0 not checked. [2024-11-09 01:15:05,427 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:15:05,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:15:05,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141377994] [2024-11-09 01:15:05,660 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:15:05,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35080803] [2024-11-09 01:15:05,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35080803] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:15:05,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [71712947] [2024-11-09 01:15:05,661 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:15:05,661 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:15:05,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:15:05,662 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:15:05,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:15:06,766 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,767 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,794 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,794 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,839 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,839 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,892 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:06,892 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,108 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,108 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,109 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,109 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,136 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,136 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,171 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,172 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,223 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,223 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,346 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,346 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,346 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,347 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,381 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,382 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,427 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,427 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,504 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:07,505 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:08,928 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:15:08,934 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:15:08,936 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:15:29,868 WARN L286 SmtUtils]: Spent 16.29s on a formula simplification. DAG size of input: 102 DAG size of output: 94 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:15:36,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22511#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:15:36,972 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:15:36,972 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:15:36,972 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2024-11-09 01:15:36,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056322445] [2024-11-09 01:15:36,972 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:15:36,973 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 01:15:36,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:15:36,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 01:15:36,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1392, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 01:15:36,974 INFO L87 Difference]: Start difference. First operand 365 states and 515 transitions. Second operand has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 8 states have call predecessors, (21), 6 states have call successors, (21) [2024-11-09 01:15:40,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:15:40,018 INFO L93 Difference]: Finished difference Result 442 states and 627 transitions. [2024-11-09 01:15:40,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-09 01:15:40,019 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 8 states have call predecessors, (21), 6 states have call successors, (21) Word has length 159 [2024-11-09 01:15:40,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:15:40,032 INFO L225 Difference]: With dead ends: 442 [2024-11-09 01:15:40,032 INFO L226 Difference]: Without dead ends: 440 [2024-11-09 01:15:40,033 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 259 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1358 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=237, Invalid=2019, Unknown=0, NotChecked=0, Total=2256 [2024-11-09 01:15:40,033 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 23 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 575 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 575 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2024-11-09 01:15:40,034 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 445 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 575 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2024-11-09 01:15:40,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2024-11-09 01:15:40,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 368. [2024-11-09 01:15:40,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 368 states, 189 states have (on average 1.164021164021164) internal successors, (220), 191 states have internal predecessors, (220), 150 states have call successors, (150), 28 states have call predecessors, (150), 28 states have return successors, (149), 148 states have call predecessors, (149), 149 states have call successors, (149) [2024-11-09 01:15:40,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 519 transitions. [2024-11-09 01:15:40,666 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 519 transitions. Word has length 159 [2024-11-09 01:15:40,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:15:40,666 INFO L471 AbstractCegarLoop]: Abstraction has 368 states and 519 transitions. [2024-11-09 01:15:40,666 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 2.142857142857143) internal successors, (30), 15 states have internal predecessors, (30), 7 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (21), 8 states have call predecessors, (21), 6 states have call successors, (21) [2024-11-09 01:15:40,666 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 519 transitions. [2024-11-09 01:15:40,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2024-11-09 01:15:40,668 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:15:40,668 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:15:40,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-09 01:15:40,869 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:15:40,869 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:15:40,870 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:15:40,870 INFO L85 PathProgramCache]: Analyzing trace with hash -346863672, now seen corresponding path program 9 times [2024-11-09 01:15:40,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:15:40,870 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823674592] [2024-11-09 01:15:40,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:15:40,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:15:40,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:15:40,912 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1074907698] [2024-11-09 01:15:40,913 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:15:40,913 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:15:40,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:15:40,915 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:15:40,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-09 01:15:41,053 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:15:41,053 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:15:41,056 INFO L255 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 54 conjuncts are in the unsatisfiable core [2024-11-09 01:15:41,059 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:15:43,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 120 proven. 89 refuted. 0 times theorem prover too weak. 971 trivial. 0 not checked. [2024-11-09 01:15:43,784 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:15:44,144 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:15:44,144 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823674592] [2024-11-09 01:15:44,145 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:15:44,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074907698] [2024-11-09 01:15:44,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074907698] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:15:44,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [214875390] [2024-11-09 01:15:44,146 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:15:44,146 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:15:44,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:15:44,146 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:15:44,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:15:45,032 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,033 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,069 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,069 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,119 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,120 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,192 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,193 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,370 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,370 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,554 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,555 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:15:45,787 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:15:45,791 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:15:45,792 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:15:54,593 WARN L286 SmtUtils]: Spent 5.99s on a formula simplification. DAG size of input: 89 DAG size of output: 82 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:15:59,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24425#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:15:59,838 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:15:59,838 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:15:59,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-09 01:15:59,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49742428] [2024-11-09 01:15:59,839 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:15:59,839 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 01:15:59,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:15:59,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 01:15:59,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1534, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 01:15:59,840 INFO L87 Difference]: Start difference. First operand 368 states and 519 transitions. Second operand has 20 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 9 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 8 states have call successors, (29) [2024-11-09 01:16:02,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:16:02,575 INFO L93 Difference]: Finished difference Result 425 states and 596 transitions. [2024-11-09 01:16:02,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 01:16:02,576 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 9 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 8 states have call successors, (29) Word has length 159 [2024-11-09 01:16:02,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:16:02,578 INFO L225 Difference]: With dead ends: 425 [2024-11-09 01:16:02,579 INFO L226 Difference]: Without dead ends: 423 [2024-11-09 01:16:02,580 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 251 SyntacticMatches, 31 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1917 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=245, Invalid=2205, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 01:16:02,580 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 35 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 907 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 907 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2024-11-09 01:16:02,581 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 550 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 907 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2024-11-09 01:16:02,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2024-11-09 01:16:03,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 347. [2024-11-09 01:16:03,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 180 states have (on average 1.1611111111111112) internal successors, (209), 182 states have internal predecessors, (209), 138 states have call successors, (138), 28 states have call predecessors, (138), 28 states have return successors, (137), 136 states have call predecessors, (137), 137 states have call successors, (137) [2024-11-09 01:16:03,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 484 transitions. [2024-11-09 01:16:03,408 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 484 transitions. Word has length 159 [2024-11-09 01:16:03,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:16:03,408 INFO L471 AbstractCegarLoop]: Abstraction has 347 states and 484 transitions. [2024-11-09 01:16:03,409 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 17 states have internal predecessors, (33), 9 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 8 states have call successors, (29) [2024-11-09 01:16:03,409 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 484 transitions. [2024-11-09 01:16:03,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2024-11-09 01:16:03,411 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:16:03,411 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:16:03,435 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-09 01:16:03,611 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-09 01:16:03,612 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:16:03,612 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:16:03,613 INFO L85 PathProgramCache]: Analyzing trace with hash -580388950, now seen corresponding path program 10 times [2024-11-09 01:16:03,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:16:03,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75809454] [2024-11-09 01:16:03,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:16:03,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:16:03,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:16:03,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [826407823] [2024-11-09 01:16:03,645 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:16:03,645 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:16:03,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:16:03,647 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:16:03,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-09 01:16:03,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:16:03,793 INFO L255 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 63 conjuncts are in the unsatisfiable core [2024-11-09 01:16:03,798 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:16:08,525 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 114 proven. 99 refuted. 0 times theorem prover too weak. 967 trivial. 0 not checked. [2024-11-09 01:16:08,525 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:16:09,741 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:16:09,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75809454] [2024-11-09 01:16:09,741 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:16:09,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826407823] [2024-11-09 01:16:09,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826407823] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:16:09,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1971300466] [2024-11-09 01:16:09,743 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:16:09,743 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:16:09,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:16:09,744 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:16:09,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:16:10,795 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,796 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,822 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,822 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,859 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,860 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,910 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:10,911 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:11,035 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:11,036 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:11,639 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:16:11,644 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:16:11,646 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:16:23,192 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26332#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:16:23,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:16:23,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:16:23,193 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-11-09 01:16:23,193 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041364550] [2024-11-09 01:16:23,193 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:16:23,194 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-09 01:16:23,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:16:23,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-09 01:16:23,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1809, Unknown=1, NotChecked=0, Total=2070 [2024-11-09 01:16:23,197 INFO L87 Difference]: Start difference. First operand 347 states and 484 transitions. Second operand has 21 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 12 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 11 states have call successors, (29) [2024-11-09 01:16:27,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:16:27,929 INFO L93 Difference]: Finished difference Result 428 states and 611 transitions. [2024-11-09 01:16:27,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 01:16:27,930 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 12 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 11 states have call successors, (29) Word has length 159 [2024-11-09 01:16:27,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:16:27,933 INFO L225 Difference]: With dead ends: 428 [2024-11-09 01:16:27,934 INFO L226 Difference]: Without dead ends: 426 [2024-11-09 01:16:27,935 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 297 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=343, Invalid=2518, Unknown=1, NotChecked=0, Total=2862 [2024-11-09 01:16:27,935 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 65 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 889 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 947 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:16:27,936 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 320 Invalid, 947 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 889 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2024-11-09 01:16:27,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2024-11-09 01:16:28,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 362. [2024-11-09 01:16:28,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 187 states have (on average 1.160427807486631) internal successors, (217), 189 states have internal predecessors, (217), 146 states have call successors, (146), 28 states have call predecessors, (146), 28 states have return successors, (145), 144 states have call predecessors, (145), 145 states have call successors, (145) [2024-11-09 01:16:28,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 508 transitions. [2024-11-09 01:16:28,692 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 508 transitions. Word has length 159 [2024-11-09 01:16:28,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:16:28,693 INFO L471 AbstractCegarLoop]: Abstraction has 362 states and 508 transitions. [2024-11-09 01:16:28,693 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 1.8333333333333333) internal successors, (33), 18 states have internal predecessors, (33), 12 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (29), 10 states have call predecessors, (29), 11 states have call successors, (29) [2024-11-09 01:16:28,693 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 508 transitions. [2024-11-09 01:16:28,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2024-11-09 01:16:28,696 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:16:28,696 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:16:28,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2024-11-09 01:16:28,897 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-09 01:16:28,898 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:16:28,898 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:16:28,898 INFO L85 PathProgramCache]: Analyzing trace with hash -478605357, now seen corresponding path program 11 times [2024-11-09 01:16:28,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:16:28,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715679096] [2024-11-09 01:16:28,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:16:28,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:16:28,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:16:28,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2102438664] [2024-11-09 01:16:28,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:16:28,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:16:28,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:16:28,941 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:16:28,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-09 01:16:29,712 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 01:16:29,712 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:16:29,715 INFO L255 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 72 conjuncts are in the unsatisfiable core [2024-11-09 01:16:29,718 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:16:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 256 proven. 61 refuted. 2 times theorem prover too weak. 869 trivial. 0 not checked. [2024-11-09 01:16:42,193 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:16:45,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:16:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715679096] [2024-11-09 01:16:45,276 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:16:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102438664] [2024-11-09 01:16:45,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102438664] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:16:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [116192812] [2024-11-09 01:16:45,278 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 01:16:45,278 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:16:45,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:16:45,278 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:16:45,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:16:46,509 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,510 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,555 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,556 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,594 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,594 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,650 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,650 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,826 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:46,826 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:16:47,432 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:16:47,437 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:16:47,439 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:16:56,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28281#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:16:56,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:16:56,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:16:56,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2024-11-09 01:16:56,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040634805] [2024-11-09 01:16:56,802 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:16:56,803 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-09 01:16:56,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:16:56,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-09 01:16:56,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=1631, Unknown=1, NotChecked=0, Total=1892 [2024-11-09 01:16:56,804 INFO L87 Difference]: Start difference. First operand 362 states and 508 transitions. Second operand has 19 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2024-11-09 01:17:09,451 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:17:26,430 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:17:28,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:17:28,537 INFO L93 Difference]: Finished difference Result 438 states and 618 transitions. [2024-11-09 01:17:28,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-09 01:17:28,538 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) Word has length 162 [2024-11-09 01:17:28,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:17:28,542 INFO L225 Difference]: With dead ends: 438 [2024-11-09 01:17:28,542 INFO L226 Difference]: Without dead ends: 434 [2024-11-09 01:17:28,544 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 368 GetRequests, 305 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1094 ImplicationChecksByTransitivity, 36.9s TimeCoverageRelationStatistics Valid=556, Invalid=3349, Unknown=1, NotChecked=0, Total=3906 [2024-11-09 01:17:28,545 INFO L432 NwaCegarLoop]: 48 mSDtfsCounter, 41 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 673 mSolverCounterSat, 58 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 673 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.1s IncrementalHoareTripleChecker+Time [2024-11-09 01:17:28,545 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 321 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 673 Invalid, 2 Unknown, 0 Unchecked, 12.1s Time] [2024-11-09 01:17:28,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2024-11-09 01:17:29,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 399. [2024-11-09 01:17:29,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 206 states have (on average 1.1553398058252426) internal successors, (238), 207 states have internal predecessors, (238), 162 states have call successors, (162), 31 states have call predecessors, (162), 30 states have return successors, (161), 160 states have call predecessors, (161), 161 states have call successors, (161) [2024-11-09 01:17:29,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 561 transitions. [2024-11-09 01:17:29,508 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 561 transitions. Word has length 162 [2024-11-09 01:17:29,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:17:29,508 INFO L471 AbstractCegarLoop]: Abstraction has 399 states and 561 transitions. [2024-11-09 01:17:29,509 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 2.125) internal successors, (34), 14 states have internal predecessors, (34), 10 states have call successors, (22), 2 states have call predecessors, (22), 3 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2024-11-09 01:17:29,509 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 561 transitions. [2024-11-09 01:17:29,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2024-11-09 01:17:29,512 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:17:29,512 INFO L215 NwaCegarLoop]: trace histogram [29, 28, 28, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:17:29,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-09 01:17:29,712 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-09 01:17:29,713 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:17:29,713 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:17:29,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1257214480, now seen corresponding path program 6 times [2024-11-09 01:17:29,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:17:29,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250616966] [2024-11-09 01:17:29,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:17:29,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:17:29,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:17:29,748 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [437302982] [2024-11-09 01:17:29,748 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:17:29,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:17:29,749 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:17:29,751 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:17:29,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-09 01:17:29,919 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:17:29,919 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:17:29,923 INFO L255 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 76 conjuncts are in the unsatisfiable core [2024-11-09 01:17:29,928 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:17:31,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 136 proven. 139 refuted. 0 times theorem prover too weak. 1456 trivial. 0 not checked. [2024-11-09 01:17:31,492 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:17:36,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 133 proven. 137 refuted. 0 times theorem prover too weak. 1461 trivial. 0 not checked. [2024-11-09 01:17:36,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:17:36,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250616966] [2024-11-09 01:17:36,809 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:17:36,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437302982] [2024-11-09 01:17:36,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437302982] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 01:17:36,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055951225] [2024-11-09 01:17:36,812 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:17:36,812 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:17:36,812 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:17:36,812 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:17:36,813 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:17:37,943 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:37,943 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:37,972 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:37,972 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,015 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,016 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,092 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,093 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,288 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,289 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,289 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,290 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,338 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,339 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,399 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,400 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,481 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,482 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,690 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,691 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,692 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,692 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,728 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,729 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,771 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,771 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,829 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:38,830 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:17:39,777 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:17:39,781 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:17:39,782 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:18:02,484 WARN L286 SmtUtils]: Spent 17.57s on a formula simplification. DAG size of input: 104 DAG size of output: 94 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:18:14,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30900#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:18:14,961 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:18:14,961 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-09 01:18:14,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18] total 35 [2024-11-09 01:18:14,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573649078] [2024-11-09 01:18:14,962 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-09 01:18:14,963 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 01:18:14,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:18:14,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 01:18:14,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2592, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 01:18:14,965 INFO L87 Difference]: Start difference. First operand 399 states and 561 transitions. Second operand has 35 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 20 states have call successors, (66), 3 states have call predecessors, (66), 3 states have return successors, (65), 19 states have call predecessors, (65), 18 states have call successors, (65) [2024-11-09 01:18:20,242 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-09 01:18:43,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:18:43,712 INFO L93 Difference]: Finished difference Result 578 states and 853 transitions. [2024-11-09 01:18:43,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2024-11-09 01:18:43,712 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 20 states have call successors, (66), 3 states have call predecessors, (66), 3 states have return successors, (65), 19 states have call predecessors, (65), 18 states have call successors, (65) Word has length 187 [2024-11-09 01:18:43,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:18:43,717 INFO L225 Difference]: With dead ends: 578 [2024-11-09 01:18:43,718 INFO L226 Difference]: Without dead ends: 572 [2024-11-09 01:18:43,720 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 476 SyntacticMatches, 30 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4091 ImplicationChecksByTransitivity, 51.6s TimeCoverageRelationStatistics Valid=1228, Invalid=7514, Unknown=0, NotChecked=0, Total=8742 [2024-11-09 01:18:43,721 INFO L432 NwaCegarLoop]: 79 mSDtfsCounter, 179 mSDsluCounter, 1192 mSDsCounter, 0 mSdLazyCounter, 1791 mSolverCounterSat, 350 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 1271 SdHoareTripleChecker+Invalid, 2142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 350 IncrementalHoareTripleChecker+Valid, 1791 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2024-11-09 01:18:43,721 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [179 Valid, 1271 Invalid, 2142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [350 Valid, 1791 Invalid, 1 Unknown, 0 Unchecked, 12.9s Time] [2024-11-09 01:18:43,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2024-11-09 01:18:45,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 478. [2024-11-09 01:18:45,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 232 states have (on average 1.1896551724137931) internal successors, (276), 233 states have internal predecessors, (276), 214 states have call successors, (214), 32 states have call predecessors, (214), 31 states have return successors, (213), 212 states have call predecessors, (213), 213 states have call successors, (213) [2024-11-09 01:18:45,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 703 transitions. [2024-11-09 01:18:45,216 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 703 transitions. Word has length 187 [2024-11-09 01:18:45,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:18:45,217 INFO L471 AbstractCegarLoop]: Abstraction has 478 states and 703 transitions. [2024-11-09 01:18:45,217 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.96875) internal successors, (63), 32 states have internal predecessors, (63), 20 states have call successors, (66), 3 states have call predecessors, (66), 3 states have return successors, (65), 19 states have call predecessors, (65), 18 states have call successors, (65) [2024-11-09 01:18:45,218 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 703 transitions. [2024-11-09 01:18:45,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2024-11-09 01:18:45,221 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:18:45,221 INFO L215 NwaCegarLoop]: trace histogram [29, 28, 28, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:18:45,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-09 01:18:45,421 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-09 01:18:45,422 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:18:45,423 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:18:45,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1409634732, now seen corresponding path program 7 times [2024-11-09 01:18:45,423 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:18:45,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567554321] [2024-11-09 01:18:45,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:18:45,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:18:45,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:18:45,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [865352775] [2024-11-09 01:18:45,482 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:18:45,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:18:45,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:18:45,484 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:18:45,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-09 01:18:45,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:18:45,662 INFO L255 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 63 conjuncts are in the unsatisfiable core [2024-11-09 01:18:45,668 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:18:48,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1731 backedges. 135 proven. 140 refuted. 0 times theorem prover too weak. 1456 trivial. 0 not checked. [2024-11-09 01:18:48,732 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:18:55,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:18:55,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567554321] [2024-11-09 01:18:55,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:18:55,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865352775] [2024-11-09 01:18:55,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865352775] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:18:55,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1743525278] [2024-11-09 01:18:55,284 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:18:55,285 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:18:55,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:18:55,285 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:18:55,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:18:56,490 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,491 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,520 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,520 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,558 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,559 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,613 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,613 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,763 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:56,764 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:18:57,394 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:18:57,399 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:18:57,400 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:19:09,235 WARN L286 SmtUtils]: Spent 8.49s on a formula simplification. DAG size of input: 89 DAG size of output: 82 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:19:16,459 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33690#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:19:16,459 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:19:16,459 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:19:16,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-11-09 01:19:16,459 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594767258] [2024-11-09 01:19:16,459 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:19:16,460 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-09 01:19:16,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:19:16,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-09 01:19:16,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=2490, Unknown=1, NotChecked=0, Total=2756 [2024-11-09 01:19:16,461 INFO L87 Difference]: Start difference. First operand 478 states and 703 transitions. Second operand has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 12 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2024-11-09 01:19:21,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:19:21,324 INFO L93 Difference]: Finished difference Result 573 states and 855 transitions. [2024-11-09 01:19:21,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 01:19:21,325 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 12 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) Word has length 187 [2024-11-09 01:19:21,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:19:21,329 INFO L225 Difference]: With dead ends: 573 [2024-11-09 01:19:21,329 INFO L226 Difference]: Without dead ends: 568 [2024-11-09 01:19:21,330 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 421 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1059 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=355, Invalid=3550, Unknown=1, NotChecked=0, Total=3906 [2024-11-09 01:19:21,331 INFO L432 NwaCegarLoop]: 57 mSDtfsCounter, 52 mSDsluCounter, 588 mSDsCounter, 0 mSdLazyCounter, 1219 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 1271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 1219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2024-11-09 01:19:21,331 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 645 Invalid, 1271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 1219 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2024-11-09 01:19:21,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2024-11-09 01:19:22,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 516. [2024-11-09 01:19:22,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 248 states have (on average 1.1975806451612903) internal successors, (297), 249 states have internal predecessors, (297), 234 states have call successors, (234), 34 states have call predecessors, (234), 33 states have return successors, (233), 232 states have call predecessors, (233), 233 states have call successors, (233) [2024-11-09 01:19:22,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 764 transitions. [2024-11-09 01:19:22,923 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 764 transitions. Word has length 187 [2024-11-09 01:19:22,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:19:22,924 INFO L471 AbstractCegarLoop]: Abstraction has 516 states and 764 transitions. [2024-11-09 01:19:22,924 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.894736842105263) internal successors, (36), 18 states have internal predecessors, (36), 12 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 11 states have call predecessors, (34), 11 states have call successors, (34) [2024-11-09 01:19:22,924 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 764 transitions. [2024-11-09 01:19:22,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2024-11-09 01:19:22,927 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:19:22,928 INFO L215 NwaCegarLoop]: trace histogram [29, 28, 28, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:19:22,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2024-11-09 01:19:23,129 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-09 01:19:23,129 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:19:23,129 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:19:23,130 INFO L85 PathProgramCache]: Analyzing trace with hash -104636675, now seen corresponding path program 8 times [2024-11-09 01:19:23,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:19:23,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [761209415] [2024-11-09 01:19:23,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:19:23,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:19:23,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:19:23,178 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1273952346] [2024-11-09 01:19:23,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 01:19:23,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:19:23,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:19:23,181 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:19:23,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-09 01:19:23,490 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-09 01:19:23,490 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:19:23,493 INFO L255 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-09 01:19:23,498 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:19:58,755 INFO L134 CoverageAnalysis]: Checked inductivity of 1739 backedges. 216 proven. 196 refuted. 0 times theorem prover too weak. 1327 trivial. 0 not checked. [2024-11-09 01:19:58,755 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:20:11,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:20:11,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [761209415] [2024-11-09 01:20:11,712 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:20:11,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1273952346] [2024-11-09 01:20:11,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1273952346] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:20:11,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447139745] [2024-11-09 01:20:11,714 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:20:11,714 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:20:11,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:20:11,714 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:20:11,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:20:12,905 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:12,905 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:12,933 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:12,933 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:12,974 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:12,974 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,029 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,029 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,187 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,187 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,382 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,382 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:20:13,714 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:20:13,721 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:20:13,723 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:20:34,916 WARN L286 SmtUtils]: Spent 6.56s on a formula simplification. DAG size of input: 98 DAG size of output: 90 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:22:11,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36229#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:22:11,516 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:22:11,517 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:22:11,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-09 01:22:11,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352459897] [2024-11-09 01:22:11,517 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:22:11,517 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 01:22:11,518 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:22:11,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 01:22:11,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1800, Unknown=13, NotChecked=0, Total=1980 [2024-11-09 01:22:11,519 INFO L87 Difference]: Start difference. First operand 516 states and 764 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 11 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-09 01:22:21,088 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:23,775 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:26,558 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:27,682 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.06s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:30,345 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:33,221 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:34,885 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:36,889 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:40,835 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:42,034 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.20s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:44,037 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:46,992 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:49,041 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:51,896 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:53,541 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.08s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:58,075 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:22:59,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:23:01,313 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-09 01:23:02,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:23:02,875 INFO L93 Difference]: Finished difference Result 676 states and 1023 transitions. [2024-11-09 01:23:02,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 01:23:02,876 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 11 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) Word has length 190 [2024-11-09 01:23:02,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:23:02,892 INFO L225 Difference]: With dead ends: 676 [2024-11-09 01:23:02,893 INFO L226 Difference]: Without dead ends: 671 [2024-11-09 01:23:02,894 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 311 SyntacticMatches, 39 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1770 ImplicationChecksByTransitivity, 156.1s TimeCoverageRelationStatistics Valid=236, Invalid=2721, Unknown=13, NotChecked=0, Total=2970 [2024-11-09 01:23:02,899 INFO L432 NwaCegarLoop]: 53 mSDtfsCounter, 29 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 28 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 44.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 684 SdHoareTripleChecker+Invalid, 791 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 45.0s IncrementalHoareTripleChecker+Time [2024-11-09 01:23:02,899 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 684 Invalid, 791 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 756 Invalid, 7 Unknown, 0 Unchecked, 45.0s Time] [2024-11-09 01:23:02,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2024-11-09 01:23:04,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 549. [2024-11-09 01:23:04,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 549 states, 266 states have (on average 1.1917293233082706) internal successors, (317), 267 states have internal predecessors, (317), 246 states have call successors, (246), 37 states have call predecessors, (246), 36 states have return successors, (245), 244 states have call predecessors, (245), 245 states have call successors, (245) [2024-11-09 01:23:04,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 549 states to 549 states and 808 transitions. [2024-11-09 01:23:04,796 INFO L78 Accepts]: Start accepts. Automaton has 549 states and 808 transitions. Word has length 190 [2024-11-09 01:23:04,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:23:04,797 INFO L471 AbstractCegarLoop]: Abstraction has 549 states and 808 transitions. [2024-11-09 01:23:04,797 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 16 states have internal predecessors, (35), 11 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-09 01:23:04,797 INFO L276 IsEmpty]: Start isEmpty. Operand 549 states and 808 transitions. [2024-11-09 01:23:04,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2024-11-09 01:23:04,801 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:23:04,802 INFO L215 NwaCegarLoop]: trace histogram [33, 32, 32, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:23:04,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2024-11-09 01:23:05,005 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:23:05,006 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:23:05,006 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:23:05,006 INFO L85 PathProgramCache]: Analyzing trace with hash -1355339403, now seen corresponding path program 9 times [2024-11-09 01:23:05,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:23:05,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259140200] [2024-11-09 01:23:05,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:23:05,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:23:05,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:23:05,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1333113220] [2024-11-09 01:23:05,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 01:23:05,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:23:05,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:23:05,073 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:23:05,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-09 01:23:05,253 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 01:23:05,253 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 01:23:05,257 INFO L255 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-09 01:23:05,262 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:23:08,440 INFO L134 CoverageAnalysis]: Checked inductivity of 2253 backedges. 192 proven. 145 refuted. 0 times theorem prover too weak. 1916 trivial. 0 not checked. [2024-11-09 01:23:08,440 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:23:12,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:23:12,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259140200] [2024-11-09 01:23:12,845 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:23:12,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333113220] [2024-11-09 01:23:12,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333113220] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:23:12,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503825839] [2024-11-09 01:23:12,847 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:23:12,847 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:23:12,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:23:12,848 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:23:12,848 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:23:13,844 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:13,845 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:13,882 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:13,882 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:13,945 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:13,946 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,034 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,035 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,290 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,291 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,555 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,556 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:14,944 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:23:14,950 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:23:14,952 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 01:23:23,726 WARN L286 SmtUtils]: Spent 6.39s on a formula simplification. DAG size of input: 89 DAG size of output: 82 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-09 01:23:36,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39065#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location [2024-11-09 01:23:36,177 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 01:23:36,177 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-09 01:23:36,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2024-11-09 01:23:36,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170579089] [2024-11-09 01:23:36,178 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-09 01:23:36,178 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2024-11-09 01:23:36,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 01:23:36,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2024-11-09 01:23:36,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=2048, Unknown=0, NotChecked=0, Total=2256 [2024-11-09 01:23:36,180 INFO L87 Difference]: Start difference. First operand 549 states and 808 transitions. Second operand has 22 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 12 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (38), 12 states have call predecessors, (38), 11 states have call successors, (38) [2024-11-09 01:23:44,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 01:23:44,747 INFO L93 Difference]: Finished difference Result 610 states and 902 transitions. [2024-11-09 01:23:44,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-09 01:23:44,747 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 12 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (38), 12 states have call predecessors, (38), 11 states have call successors, (38) Word has length 209 [2024-11-09 01:23:44,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 01:23:44,751 INFO L225 Difference]: With dead ends: 610 [2024-11-09 01:23:44,751 INFO L226 Difference]: Without dead ends: 605 [2024-11-09 01:23:44,751 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 343 SyntacticMatches, 42 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2838 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=298, Invalid=3124, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 01:23:44,752 INFO L432 NwaCegarLoop]: 62 mSDtfsCounter, 40 mSDsluCounter, 792 mSDsCounter, 0 mSdLazyCounter, 1399 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 854 SdHoareTripleChecker+Invalid, 1428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2024-11-09 01:23:44,752 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 854 Invalid, 1428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1399 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2024-11-09 01:23:44,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2024-11-09 01:23:46,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 553. [2024-11-09 01:23:46,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 269 states have (on average 1.1895910780669146) internal successors, (320), 270 states have internal predecessors, (320), 246 states have call successors, (246), 38 states have call predecessors, (246), 37 states have return successors, (245), 244 states have call predecessors, (245), 245 states have call successors, (245) [2024-11-09 01:23:46,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 811 transitions. [2024-11-09 01:23:46,453 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 811 transitions. Word has length 209 [2024-11-09 01:23:46,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 01:23:46,454 INFO L471 AbstractCegarLoop]: Abstraction has 553 states and 811 transitions. [2024-11-09 01:23:46,454 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.9) internal successors, (38), 19 states have internal predecessors, (38), 12 states have call successors, (39), 2 states have call predecessors, (39), 3 states have return successors, (38), 12 states have call predecessors, (38), 11 states have call successors, (38) [2024-11-09 01:23:46,454 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 811 transitions. [2024-11-09 01:23:46,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2024-11-09 01:23:46,458 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 01:23:46,458 INFO L215 NwaCegarLoop]: trace histogram [33, 32, 32, 8, 8, 8, 8, 8, 8, 8, 8, 8, 6, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 01:23:46,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-09 01:23:46,662 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:23:46,663 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 01:23:46,663 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 01:23:46,663 INFO L85 PathProgramCache]: Analyzing trace with hash 186254686, now seen corresponding path program 10 times [2024-11-09 01:23:46,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 01:23:46,663 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263588707] [2024-11-09 01:23:46,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 01:23:46,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 01:23:46,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-09 01:23:46,719 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [101038195] [2024-11-09 01:23:46,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 01:23:46,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 01:23:46,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 01:23:46,722 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 01:23:46,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9d9621bd-ec10-4ae7-ac82-7c9e6dcfa106/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-09 01:23:46,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 01:23:46,938 INFO L255 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 82 conjuncts are in the unsatisfiable core [2024-11-09 01:23:46,943 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 01:23:50,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2261 backedges. 193 proven. 239 refuted. 0 times theorem prover too weak. 1829 trivial. 0 not checked. [2024-11-09 01:23:50,089 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 01:23:51,850 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 01:23:51,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263588707] [2024-11-09 01:23:51,851 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-09 01:23:51,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101038195] [2024-11-09 01:23:51,851 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101038195] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 01:23:51,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1929379066] [2024-11-09 01:23:51,853 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-09 01:23:51,853 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 01:23:51,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 01:23:51,853 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 01:23:51,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 01:23:53,104 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,105 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,132 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,132 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,171 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,171 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,225 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,225 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,361 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,362 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,362 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,362 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,392 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,393 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,430 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,431 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,484 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,485 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,601 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,602 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,602 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,602 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,638 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,639 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,681 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,681 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,740 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:53,741 WARN L110 ntervalStateProvider]: Interval conversion did not stabilize in 10 iterations. Over-approximation may be very coarse. [2024-11-09 01:23:54,060 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-09 01:23:54,068 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs [2024-11-09 01:23:54,070 INFO L180 IcfgInterpreter]: Interpretation finished