./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 826ab2ba Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/plugins/org.eclipse.equinox.launcher_1.6.800.v20240513-1750.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E --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 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 03:25:39,067 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 03:25:39,183 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 03:25:39,193 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 03:25:39,194 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 03:25:39,232 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 03:25:39,234 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 03:25:39,234 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 03:25:39,235 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 03:25:39,235 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 03:25:39,235 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 03:25:39,237 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 03:25:39,237 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 03:25:39,237 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 03:25:39,237 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 03:25:39,237 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 03:25:39,237 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 03:25:39,238 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 03:25:39,238 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 03:25:39,238 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 03:25:39,239 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 03:25:39,239 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 03:25:39,240 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 03:25:39,240 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 03:25:39,240 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 03:25:39,240 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 03:25:39,240 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 03:25:39,240 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 03:25:39,241 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 03:25:39,241 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 03:25:39,241 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 03:25:39,241 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 03:25:39,242 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 03:25:39,242 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 03:25:39,242 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 03:25:39,242 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 03:25:39,242 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 03:25:39,243 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 03:25:39,244 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 03:25:39,244 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 03:25:39,245 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 03:25:39,245 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E 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 -> 9e9911e775b3214ba13077b05d83e9364947724e9afa3bb89f51b07ee325bd90 [2024-11-14 03:25:39,587 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 03:25:39,596 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 03:25:39,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 03:25:39,602 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 03:25:39,603 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 03:25:39,605 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c Unable to find full path for "g++" [2024-11-14 03:25:41,460 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 03:25:41,793 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 03:25:41,794 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c [2024-11-14 03:25:41,812 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/data/49d65a282/5d890c7c72b940bf92ac91d48ac9b776/FLAG6ad55ba1e [2024-11-14 03:25:41,831 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/data/49d65a282/5d890c7c72b940bf92ac91d48ac9b776 [2024-11-14 03:25:41,837 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 03:25:41,839 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 03:25:41,840 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 03:25:41,841 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 03:25:41,846 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 03:25:41,847 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 03:25:41" (1/1) ... [2024-11-14 03:25:41,849 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22e172d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:41, skipping insertion in model container [2024-11-14 03:25:41,849 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 03:25:41" (1/1) ... [2024-11-14 03:25:41,868 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 03:25:42,060 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_8d3ed777-996b-4c52-b175-31d64d571615/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2024-11-14 03:25:42,093 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 03:25:42,106 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 03:25:42,117 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_8d3ed777-996b-4c52-b175-31d64d571615/sv-benchmarks/c/nla-digbench-scaling/egcd2-ll_unwindbound20.c[490,503] [2024-11-14 03:25:42,135 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 03:25:42,155 INFO L204 MainTranslator]: Completed translation [2024-11-14 03:25:42,156 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42 WrapperNode [2024-11-14 03:25:42,156 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 03:25:42,158 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 03:25:42,158 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 03:25:42,158 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 03:25:42,165 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,171 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,192 INFO L138 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 84 [2024-11-14 03:25:42,194 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 03:25:42,195 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 03:25:42,195 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 03:25:42,196 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 03:25:42,203 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,204 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,205 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,207 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,214 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,217 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,221 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,223 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,225 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 03:25:42,229 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 03:25:42,229 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 03:25:42,230 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 03:25:42,231 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (1/1) ... [2024-11-14 03:25:42,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 03:25:42,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:42,267 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 03:25:42,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 03:25:42,298 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 03:25:42,298 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-14 03:25:42,299 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-14 03:25:42,299 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 03:25:42,299 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 03:25:42,299 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 03:25:42,300 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-14 03:25:42,300 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-14 03:25:42,381 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 03:25:42,383 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 03:25:42,668 INFO L? ?]: Removed 11 outVars from TransFormulas that were not future-live. [2024-11-14 03:25:42,669 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 03:25:42,705 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 03:25:42,705 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-14 03:25:42,705 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 03:25:42 BoogieIcfgContainer [2024-11-14 03:25:42,706 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 03:25:42,708 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 03:25:42,708 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 03:25:42,716 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 03:25:42,717 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 03:25:41" (1/3) ... [2024-11-14 03:25:42,717 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@169e7fc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 03:25:42, skipping insertion in model container [2024-11-14 03:25:42,717 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:25:42" (2/3) ... [2024-11-14 03:25:42,717 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@169e7fc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 03:25:42, skipping insertion in model container [2024-11-14 03:25:42,718 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 03:25:42" (3/3) ... [2024-11-14 03:25:42,720 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound20.c [2024-11-14 03:25:42,735 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 03:25:42,738 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG egcd2-ll_unwindbound20.c that has 3 procedures, 29 locations, 1 initial locations, 2 loop locations, and 1 error locations. [2024-11-14 03:25:42,804 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 03:25:42,822 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;@78b48f59, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 03:25:42,822 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 03:25:42,827 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2024-11-14 03:25:42,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-14 03:25:42,837 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:42,838 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:42,838 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:42,845 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:42,846 INFO L85 PathProgramCache]: Analyzing trace with hash -143790805, now seen corresponding path program 1 times [2024-11-14 03:25:42,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:42,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068267932] [2024-11-14 03:25:42,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:42,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:42,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,082 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 03:25:43,082 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:43,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068267932] [2024-11-14 03:25:43,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068267932] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:43,084 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:43,084 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-14 03:25:43,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320594799] [2024-11-14 03:25:43,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:43,093 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-14 03:25:43,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:43,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-14 03:25:43,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-14 03:25:43,121 INFO L87 Difference]: Start difference. First operand has 29 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 17 states have internal predecessors, (23), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:43,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:43,164 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2024-11-14 03:25:43,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-14 03:25:43,167 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 19 [2024-11-14 03:25:43,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:43,175 INFO L225 Difference]: With dead ends: 50 [2024-11-14 03:25:43,178 INFO L226 Difference]: Without dead ends: 27 [2024-11-14 03:25:43,181 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 [2024-11-14 03:25:43,185 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:43,185 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 03:25:43,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-14 03:25:43,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-14 03:25:43,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 16 states have internal predecessors, (19), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-11-14 03:25:43,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2024-11-14 03:25:43,231 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 19 [2024-11-14 03:25:43,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:43,236 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2024-11-14 03:25:43,236 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:43,236 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2024-11-14 03:25:43,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-14 03:25:43,239 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:43,239 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:43,239 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 03:25:43,240 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:43,240 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:43,241 INFO L85 PathProgramCache]: Analyzing trace with hash -1203477869, now seen corresponding path program 1 times [2024-11-14 03:25:43,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:43,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645732723] [2024-11-14 03:25:43,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:43,244 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:43,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,508 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 03:25:43,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:43,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645732723] [2024-11-14 03:25:43,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645732723] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:43,508 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:43,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-14 03:25:43,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598544274] [2024-11-14 03:25:43,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:43,510 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-14 03:25:43,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:43,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-14 03:25:43,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-14 03:25:43,513 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:43,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:43,563 INFO L93 Difference]: Finished difference Result 37 states and 49 transitions. [2024-11-14 03:25:43,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 03:25:43,564 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 20 [2024-11-14 03:25:43,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:43,566 INFO L225 Difference]: With dead ends: 37 [2024-11-14 03:25:43,567 INFO L226 Difference]: Without dead ends: 29 [2024-11-14 03:25:43,567 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2024-11-14 03:25:43,568 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 5 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:43,570 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 91 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 03:25:43,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-14 03:25:43,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2024-11-14 03:25:43,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-11-14 03:25:43,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 40 transitions. [2024-11-14 03:25:43,607 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 40 transitions. Word has length 20 [2024-11-14 03:25:43,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:43,608 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 40 transitions. [2024-11-14 03:25:43,608 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:43,608 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 40 transitions. [2024-11-14 03:25:43,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2024-11-14 03:25:43,608 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:43,608 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:43,609 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 03:25:43,609 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:43,609 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:43,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1341228556, now seen corresponding path program 1 times [2024-11-14 03:25:43,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:43,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36457244] [2024-11-14 03:25:43,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:43,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:43,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-14 03:25:43,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:43,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36457244] [2024-11-14 03:25:43,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36457244] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:25:43,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009148854] [2024-11-14 03:25:43,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:43,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:43,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:43,864 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:43,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 03:25:43,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,949 INFO L255 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjuncts are in the unsatisfiable core [2024-11-14 03:25:43,957 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:44,019 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-14 03:25:44,019 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:44,117 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-14 03:25:44,117 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009148854] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:44,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1323572869] [2024-11-14 03:25:44,138 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2024-11-14 03:25:44,138 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:44,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:44,146 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:44,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:25:45,488 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:25:45,494 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:25:47,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1323572869] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:47,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:25:47,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 5, 5] total 15 [2024-11-14 03:25:47,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443936059] [2024-11-14 03:25:47,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:47,101 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-14 03:25:47,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:47,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-14 03:25:47,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2024-11-14 03:25:47,104 INFO L87 Difference]: Start difference. First operand 29 states and 40 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-14 03:25:47,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:47,765 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2024-11-14 03:25:47,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 03:25:47,766 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2024-11-14 03:25:47,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:47,767 INFO L225 Difference]: With dead ends: 39 [2024-11-14 03:25:47,767 INFO L226 Difference]: Without dead ends: 31 [2024-11-14 03:25:47,767 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2024-11-14 03:25:47,768 INFO L432 NwaCegarLoop]: 27 mSDtfsCounter, 1 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:47,768 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 153 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-14 03:25:47,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2024-11-14 03:25:47,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2024-11-14 03:25:47,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-11-14 03:25:47,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 41 transitions. [2024-11-14 03:25:47,784 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 41 transitions. Word has length 21 [2024-11-14 03:25:47,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:47,784 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 41 transitions. [2024-11-14 03:25:47,785 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 5 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2024-11-14 03:25:47,785 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 41 transitions. [2024-11-14 03:25:47,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2024-11-14 03:25:47,786 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:47,786 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:47,807 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-14 03:25:47,991 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:47,991 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:47,992 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:47,992 INFO L85 PathProgramCache]: Analyzing trace with hash 373669115, now seen corresponding path program 1 times [2024-11-14 03:25:47,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:47,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113611373] [2024-11-14 03:25:47,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:47,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:48,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:25:48,014 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [363869897] [2024-11-14 03:25:48,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:48,014 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:48,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:48,016 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:48,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 03:25:48,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:48,084 INFO L255 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 03:25:48,086 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:48,136 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 03:25:48,137 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 03:25:48,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:48,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113611373] [2024-11-14 03:25:48,138 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:25:48,138 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363869897] [2024-11-14 03:25:48,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363869897] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:48,138 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:48,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 03:25:48,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025938321] [2024-11-14 03:25:48,139 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:48,139 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 03:25:48,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:48,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 03:25:48,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 03:25:48,140 INFO L87 Difference]: Start difference. First operand 30 states and 41 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:48,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:48,215 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2024-11-14 03:25:48,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 03:25:48,216 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 23 [2024-11-14 03:25:48,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:48,217 INFO L225 Difference]: With dead ends: 44 [2024-11-14 03:25:48,219 INFO L226 Difference]: Without dead ends: 42 [2024-11-14 03:25:48,219 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 03:25:48,220 INFO L432 NwaCegarLoop]: 30 mSDtfsCounter, 5 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:48,220 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 113 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:25:48,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-14 03:25:48,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37. [2024-11-14 03:25:48,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 24 states have internal predecessors, (28), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2024-11-14 03:25:48,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 49 transitions. [2024-11-14 03:25:48,241 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 49 transitions. Word has length 23 [2024-11-14 03:25:48,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:48,242 INFO L471 AbstractCegarLoop]: Abstraction has 37 states and 49 transitions. [2024-11-14 03:25:48,242 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:48,242 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 49 transitions. [2024-11-14 03:25:48,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-14 03:25:48,243 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:48,244 INFO L215 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:48,266 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-14 03:25:48,444 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:48,444 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:48,445 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:48,445 INFO L85 PathProgramCache]: Analyzing trace with hash 275905003, now seen corresponding path program 1 times [2024-11-14 03:25:48,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:48,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384323755] [2024-11-14 03:25:48,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:48,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:48,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:48,559 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 03:25:48,559 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:48,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384323755] [2024-11-14 03:25:48,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384323755] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:48,560 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:48,560 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2024-11-14 03:25:48,560 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297690513] [2024-11-14 03:25:48,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:48,560 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-14 03:25:48,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:48,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-14 03:25:48,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 03:25:48,561 INFO L87 Difference]: Start difference. First operand 37 states and 49 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:48,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:48,619 INFO L93 Difference]: Finished difference Result 65 states and 87 transitions. [2024-11-14 03:25:48,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 03:25:48,622 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 26 [2024-11-14 03:25:48,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:48,624 INFO L225 Difference]: With dead ends: 65 [2024-11-14 03:25:48,624 INFO L226 Difference]: Without dead ends: 39 [2024-11-14 03:25:48,624 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-14 03:25:48,627 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 6 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:48,629 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 90 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-14 03:25:48,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2024-11-14 03:25:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2024-11-14 03:25:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 24 states have (on average 1.25) internal successors, (30), 26 states have internal predecessors, (30), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2024-11-14 03:25:48,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 51 transitions. [2024-11-14 03:25:48,647 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 51 transitions. Word has length 26 [2024-11-14 03:25:48,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:48,651 INFO L471 AbstractCegarLoop]: Abstraction has 39 states and 51 transitions. [2024-11-14 03:25:48,651 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-14 03:25:48,651 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 51 transitions. [2024-11-14 03:25:48,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2024-11-14 03:25:48,652 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:48,652 INFO L215 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:48,652 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2024-11-14 03:25:48,652 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:48,652 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:48,652 INFO L85 PathProgramCache]: Analyzing trace with hash -1646055805, now seen corresponding path program 1 times [2024-11-14 03:25:48,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:48,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011209465] [2024-11-14 03:25:48,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:48,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:48,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:25:48,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [15801992] [2024-11-14 03:25:48,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:48,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:48,686 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:48,690 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:48,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 03:25:48,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:48,762 INFO L255 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 03:25:48,764 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:48,895 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2024-11-14 03:25:48,895 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 03:25:48,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:48,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011209465] [2024-11-14 03:25:48,896 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:25:48,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15801992] [2024-11-14 03:25:48,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15801992] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:48,896 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:48,896 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 03:25:48,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391452765] [2024-11-14 03:25:48,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:48,897 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 03:25:48,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:48,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 03:25:48,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 03:25:48,898 INFO L87 Difference]: Start difference. First operand 39 states and 51 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-14 03:25:48,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:48,978 INFO L93 Difference]: Finished difference Result 54 states and 72 transitions. [2024-11-14 03:25:48,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 03:25:48,979 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2024-11-14 03:25:48,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:48,980 INFO L225 Difference]: With dead ends: 54 [2024-11-14 03:25:48,980 INFO L226 Difference]: Without dead ends: 52 [2024-11-14 03:25:48,981 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 [2024-11-14 03:25:48,984 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:48,985 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 123 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:25:48,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2024-11-14 03:25:49,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2024-11-14 03:25:49,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 33 states have internal predecessors, (38), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-14 03:25:49,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 69 transitions. [2024-11-14 03:25:49,008 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 69 transitions. Word has length 28 [2024-11-14 03:25:49,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:49,008 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 69 transitions. [2024-11-14 03:25:49,009 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2024-11-14 03:25:49,009 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 69 transitions. [2024-11-14 03:25:49,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-14 03:25:49,011 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:49,011 INFO L215 NwaCegarLoop]: trace histogram [4, 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] [2024-11-14 03:25:49,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-14 03:25:49,216 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:49,216 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:49,216 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:49,216 INFO L85 PathProgramCache]: Analyzing trace with hash 204769723, now seen corresponding path program 1 times [2024-11-14 03:25:49,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:49,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44806679] [2024-11-14 03:25:49,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:49,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:49,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:25:49,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1164341200] [2024-11-14 03:25:49,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:49,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:49,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:49,259 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:49,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 03:25:49,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:49,330 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 03:25:49,332 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:49,437 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-14 03:25:49,437 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 03:25:49,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:49,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44806679] [2024-11-14 03:25:49,437 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:25:49,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164341200] [2024-11-14 03:25:49,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164341200] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:49,438 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:49,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 03:25:49,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212375253] [2024-11-14 03:25:49,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:49,438 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 03:25:49,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:49,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 03:25:49,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 03:25:49,440 INFO L87 Difference]: Start difference. First operand 51 states and 69 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2024-11-14 03:25:49,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:49,529 INFO L93 Difference]: Finished difference Result 58 states and 75 transitions. [2024-11-14 03:25:49,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 03:25:49,530 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 33 [2024-11-14 03:25:49,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:49,531 INFO L225 Difference]: With dead ends: 58 [2024-11-14 03:25:49,534 INFO L226 Difference]: Without dead ends: 56 [2024-11-14 03:25:49,534 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 [2024-11-14 03:25:49,535 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 6 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:49,535 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 114 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:25:49,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2024-11-14 03:25:49,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2024-11-14 03:25:49,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 36 states have internal predecessors, (41), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-14 03:25:49,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 72 transitions. [2024-11-14 03:25:49,559 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 72 transitions. Word has length 33 [2024-11-14 03:25:49,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:49,560 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 72 transitions. [2024-11-14 03:25:49,560 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2024-11-14 03:25:49,561 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 72 transitions. [2024-11-14 03:25:49,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2024-11-14 03:25:49,562 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:49,562 INFO L215 NwaCegarLoop]: trace histogram [4, 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] [2024-11-14 03:25:49,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-14 03:25:49,763 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:49,763 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:49,763 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:49,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1859090109, now seen corresponding path program 1 times [2024-11-14 03:25:49,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:49,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236648434] [2024-11-14 03:25:49,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:49,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:49,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:25:49,792 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [272770580] [2024-11-14 03:25:49,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:49,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:49,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:49,797 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:49,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 03:25:49,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:49,864 INFO L255 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 11 conjuncts are in the unsatisfiable core [2024-11-14 03:25:49,866 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:50,031 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-14 03:25:50,032 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-14 03:25:50,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:50,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236648434] [2024-11-14 03:25:50,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:25:50,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272770580] [2024-11-14 03:25:50,033 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272770580] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:25:50,033 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:25:50,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 03:25:50,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932926730] [2024-11-14 03:25:50,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:25:50,034 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 03:25:50,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:50,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 03:25:50,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 03:25:50,035 INFO L87 Difference]: Start difference. First operand 55 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2024-11-14 03:25:50,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:50,126 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2024-11-14 03:25:50,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 03:25:50,126 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 38 [2024-11-14 03:25:50,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:50,127 INFO L225 Difference]: With dead ends: 62 [2024-11-14 03:25:50,127 INFO L226 Difference]: Without dead ends: 60 [2024-11-14 03:25:50,128 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 [2024-11-14 03:25:50,128 INFO L432 NwaCegarLoop]: 31 mSDtfsCounter, 6 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:50,128 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 111 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:25:50,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2024-11-14 03:25:50,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2024-11-14 03:25:50,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 39 states have internal predecessors, (44), 16 states have call successors, (16), 6 states have call predecessors, (16), 6 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-14 03:25:50,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2024-11-14 03:25:50,141 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 38 [2024-11-14 03:25:50,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:50,141 INFO L471 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2024-11-14 03:25:50,141 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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) [2024-11-14 03:25:50,141 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2024-11-14 03:25:50,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-14 03:25:50,142 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:50,142 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 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] [2024-11-14 03:25:50,163 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-14 03:25:50,343 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:50,343 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:50,343 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:50,344 INFO L85 PathProgramCache]: Analyzing trace with hash 39088359, now seen corresponding path program 1 times [2024-11-14 03:25:50,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:50,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202067647] [2024-11-14 03:25:50,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:50,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:50,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:25:50,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1236533491] [2024-11-14 03:25:50,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:50,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:50,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:50,367 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:50,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 03:25:50,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:50,455 INFO L255 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-14 03:25:50,457 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:50,559 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:25:50,559 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:50,698 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:25:50,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:50,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202067647] [2024-11-14 03:25:50,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:25:50,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236533491] [2024-11-14 03:25:50,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236533491] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:50,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742969944] [2024-11-14 03:25:50,704 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2024-11-14 03:25:50,704 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:50,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:50,707 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:50,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:25:54,766 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:25:54,778 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:25:54,780 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:25:58,527 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1990#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:25:58,527 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:25:58,527 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:25:58,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2024-11-14 03:25:58,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710973541] [2024-11-14 03:25:58,528 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:25:58,528 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 03:25:58,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:58,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 03:25:58,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=614, Unknown=0, NotChecked=0, Total=702 [2024-11-14 03:25:58,529 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-14 03:25:58,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:58,671 INFO L93 Difference]: Finished difference Result 89 states and 124 transitions. [2024-11-14 03:25:58,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-14 03:25:58,671 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 46 [2024-11-14 03:25:58,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:58,674 INFO L225 Difference]: With dead ends: 89 [2024-11-14 03:25:58,675 INFO L226 Difference]: Without dead ends: 87 [2024-11-14 03:25:58,675 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 108 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=93, Invalid=663, Unknown=0, NotChecked=0, Total=756 [2024-11-14 03:25:58,676 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 9 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 192 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 [2024-11-14 03:25:58,676 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 192 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:25:58,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2024-11-14 03:25:58,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 55. [2024-11-14 03:25:58,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 35 states have internal predecessors, (41), 14 states have call successors, (14), 6 states have call predecessors, (14), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2024-11-14 03:25:58,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2024-11-14 03:25:58,690 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 46 [2024-11-14 03:25:58,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:58,691 INFO L471 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2024-11-14 03:25:58,691 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2024-11-14 03:25:58,691 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2024-11-14 03:25:58,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2024-11-14 03:25:58,692 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:58,692 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 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] [2024-11-14 03:25:58,711 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-14 03:25:58,896 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:58,896 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:58,896 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:58,897 INFO L85 PathProgramCache]: Analyzing trace with hash 212178052, now seen corresponding path program 1 times [2024-11-14 03:25:58,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:58,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800231069] [2024-11-14 03:25:58,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:58,897 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:58,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:59,044 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:25:59,045 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:59,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800231069] [2024-11-14 03:25:59,045 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800231069] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:25:59,045 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760403115] [2024-11-14 03:25:59,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:59,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:59,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:59,047 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:59,050 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 03:25:59,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:59,125 INFO L255 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 03:25:59,127 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:59,202 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:25:59,202 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:59,303 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:25:59,303 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760403115] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:59,303 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1470705256] [2024-11-14 03:25:59,305 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:25:59,305 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:59,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:59,306 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:59,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:03,926 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2024-11-14 03:26:04,175 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:04,176 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:26:08,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2527#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:26:08,829 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:26:08,829 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:26:08,829 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 6] total 12 [2024-11-14 03:26:08,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072022984] [2024-11-14 03:26:08,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:26:08,830 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-14 03:26:08,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:26:08,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-14 03:26:08,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2024-11-14 03:26:08,831 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2024-11-14 03:26:09,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:26:09,090 INFO L93 Difference]: Finished difference Result 208 states and 247 transitions. [2024-11-14 03:26:09,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-14 03:26:09,090 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) Word has length 47 [2024-11-14 03:26:09,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:26:09,092 INFO L225 Difference]: With dead ends: 208 [2024-11-14 03:26:09,093 INFO L226 Difference]: Without dead ends: 200 [2024-11-14 03:26:09,094 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 114 SyntacticMatches, 4 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:26:09,094 INFO L432 NwaCegarLoop]: 33 mSDtfsCounter, 86 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:26:09,095 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 134 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:26:09,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2024-11-14 03:26:09,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 192. [2024-11-14 03:26:09,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 122 states have (on average 1.1967213114754098) internal successors, (146), 126 states have internal predecessors, (146), 44 states have call successors, (44), 25 states have call predecessors, (44), 25 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2024-11-14 03:26:09,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 230 transitions. [2024-11-14 03:26:09,137 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 230 transitions. Word has length 47 [2024-11-14 03:26:09,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:26:09,138 INFO L471 AbstractCegarLoop]: Abstraction has 192 states and 230 transitions. [2024-11-14 03:26:09,138 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 12 states have internal predecessors, (37), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2024-11-14 03:26:09,138 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 230 transitions. [2024-11-14 03:26:09,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-14 03:26:09,139 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:26:09,139 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 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] [2024-11-14 03:26:09,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-14 03:26:09,344 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-14 03:26:09,344 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:26:09,344 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:26:09,345 INFO L85 PathProgramCache]: Analyzing trace with hash -2018078149, now seen corresponding path program 1 times [2024-11-14 03:26:09,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:26:09,345 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008529539] [2024-11-14 03:26:09,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:09,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:26:09,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:09,598 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-11-14 03:26:09,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:09,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008529539] [2024-11-14 03:26:09,599 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008529539] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:26:09,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852312699] [2024-11-14 03:26:09,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:09,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:09,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:09,601 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:09,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 03:26:09,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:09,689 INFO L255 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 03:26:09,691 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:09,743 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-11-14 03:26:09,744 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:09,854 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2024-11-14 03:26:09,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852312699] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:26:09,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2085574635] [2024-11-14 03:26:09,856 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:26:09,859 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:09,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:09,859 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:09,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:13,473 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 107 for LOIs [2024-11-14 03:26:13,660 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:13,662 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:26:17,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3462#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:26:17,871 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:26:17,871 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:26:17,871 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2024-11-14 03:26:17,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089241829] [2024-11-14 03:26:17,872 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:26:17,872 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 03:26:17,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:26:17,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 03:26:17,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2024-11-14 03:26:17,873 INFO L87 Difference]: Start difference. First operand 192 states and 230 transitions. Second operand has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2024-11-14 03:26:18,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:26:18,183 INFO L93 Difference]: Finished difference Result 276 states and 361 transitions. [2024-11-14 03:26:18,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-14 03:26:18,183 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 48 [2024-11-14 03:26:18,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:26:18,186 INFO L225 Difference]: With dead ends: 276 [2024-11-14 03:26:18,186 INFO L226 Difference]: Without dead ends: 256 [2024-11-14 03:26:18,187 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2024-11-14 03:26:18,187 INFO L432 NwaCegarLoop]: 44 mSDtfsCounter, 60 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:26:18,188 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 230 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:26:18,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2024-11-14 03:26:18,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 232. [2024-11-14 03:26:18,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 149 states have (on average 1.2281879194630871) internal successors, (183), 152 states have internal predecessors, (183), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2024-11-14 03:26:18,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 296 transitions. [2024-11-14 03:26:18,231 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 296 transitions. Word has length 48 [2024-11-14 03:26:18,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:26:18,231 INFO L471 AbstractCegarLoop]: Abstraction has 232 states and 296 transitions. [2024-11-14 03:26:18,231 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2024-11-14 03:26:18,232 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 296 transitions. [2024-11-14 03:26:18,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-14 03:26:18,235 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:26:18,236 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:26:18,250 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-14 03:26:18,438 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-14 03:26:18,438 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:26:18,438 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:26:18,438 INFO L85 PathProgramCache]: Analyzing trace with hash 435271584, now seen corresponding path program 1 times [2024-11-14 03:26:18,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:26:18,439 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723591730] [2024-11-14 03:26:18,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:18,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:26:18,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:18,567 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:26:18,568 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:18,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723591730] [2024-11-14 03:26:18,568 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723591730] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:26:18,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001520740] [2024-11-14 03:26:18,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:18,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:18,569 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:18,571 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:18,572 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 03:26:18,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:18,640 INFO L255 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 03:26:18,641 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:18,717 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:26:18,717 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:18,801 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 11 proven. 2 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:26:18,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001520740] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:26:18,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947427049] [2024-11-14 03:26:18,804 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:26:18,804 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:18,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:18,804 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:18,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:24,664 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:26:24,667 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:24,668 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:26:28,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4590#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:26:28,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:26:28,526 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:26:28,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 6] total 12 [2024-11-14 03:26:28,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119216215] [2024-11-14 03:26:28,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:26:28,526 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-14 03:26:28,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:26:28,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-14 03:26:28,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=881, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:26:28,528 INFO L87 Difference]: Start difference. First operand 232 states and 296 transitions. Second operand has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2024-11-14 03:26:28,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:26:28,827 INFO L93 Difference]: Finished difference Result 341 states and 445 transitions. [2024-11-14 03:26:28,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 03:26:28,828 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) Word has length 50 [2024-11-14 03:26:28,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:26:28,829 INFO L225 Difference]: With dead ends: 341 [2024-11-14 03:26:28,829 INFO L226 Difference]: Without dead ends: 245 [2024-11-14 03:26:28,831 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 434 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=205, Invalid=1127, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 03:26:28,832 INFO L432 NwaCegarLoop]: 32 mSDtfsCounter, 69 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:26:28,833 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 151 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:26:28,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2024-11-14 03:26:28,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 241. [2024-11-14 03:26:28,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 158 states have (on average 1.1772151898734178) internal successors, (186), 161 states have internal predecessors, (186), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2024-11-14 03:26:28,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 299 transitions. [2024-11-14 03:26:28,880 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 299 transitions. Word has length 50 [2024-11-14 03:26:28,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:26:28,882 INFO L471 AbstractCegarLoop]: Abstraction has 241 states and 299 transitions. [2024-11-14 03:26:28,882 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.25) internal successors, (39), 12 states have internal predecessors, (39), 6 states have call successors, (25), 4 states have call predecessors, (25), 3 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2024-11-14 03:26:28,882 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 299 transitions. [2024-11-14 03:26:28,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-11-14 03:26:28,883 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:26:28,883 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 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] [2024-11-14 03:26:28,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-14 03:26:29,084 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-14 03:26:29,084 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:26:29,084 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:26:29,084 INFO L85 PathProgramCache]: Analyzing trace with hash -1360011404, now seen corresponding path program 1 times [2024-11-14 03:26:29,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:26:29,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626590513] [2024-11-14 03:26:29,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:29,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:26:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:26:29,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1603154158] [2024-11-14 03:26:29,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:29,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:29,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:29,122 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:29,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 03:26:29,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:29,207 INFO L255 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-14 03:26:29,209 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:29,611 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 10 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-14 03:26:29,611 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:29,932 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 10 proven. 7 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2024-11-14 03:26:29,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:29,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626590513] [2024-11-14 03:26:29,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:26:29,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603154158] [2024-11-14 03:26:29,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603154158] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:26:29,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931429072] [2024-11-14 03:26:29,936 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:26:29,936 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:29,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:29,938 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:29,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:32,843 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2024-11-14 03:26:32,977 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:32,978 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:26:37,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5855#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:26:37,818 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:26:37,818 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:26:37,818 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2024-11-14 03:26:37,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510754046] [2024-11-14 03:26:37,818 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:26:37,819 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 03:26:37,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:26:37,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 03:26:37,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=835, Unknown=0, NotChecked=0, Total=992 [2024-11-14 03:26:37,820 INFO L87 Difference]: Start difference. First operand 241 states and 299 transitions. Second operand has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) [2024-11-14 03:26:39,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:26:39,292 INFO L93 Difference]: Finished difference Result 294 states and 377 transitions. [2024-11-14 03:26:39,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-14 03:26:39,293 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) Word has length 55 [2024-11-14 03:26:39,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:26:39,296 INFO L225 Difference]: With dead ends: 294 [2024-11-14 03:26:39,296 INFO L226 Difference]: Without dead ends: 289 [2024-11-14 03:26:39,297 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 126 SyntacticMatches, 7 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=240, Invalid=1320, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 03:26:39,298 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 60 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-14 03:26:39,298 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 360 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-14 03:26:39,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2024-11-14 03:26:39,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 278. [2024-11-14 03:26:39,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 181 states have (on average 1.1933701657458564) internal successors, (216), 185 states have internal predecessors, (216), 69 states have call successors, (69), 27 states have call predecessors, (69), 27 states have return successors, (65), 65 states have call predecessors, (65), 65 states have call successors, (65) [2024-11-14 03:26:39,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 350 transitions. [2024-11-14 03:26:39,373 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 350 transitions. Word has length 55 [2024-11-14 03:26:39,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:26:39,374 INFO L471 AbstractCegarLoop]: Abstraction has 278 states and 350 transitions. [2024-11-14 03:26:39,374 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 12 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) [2024-11-14 03:26:39,374 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 350 transitions. [2024-11-14 03:26:39,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-14 03:26:39,376 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:26:39,376 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 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] [2024-11-14 03:26:39,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-14 03:26:39,581 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-14 03:26:39,581 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:26:39,582 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:26:39,582 INFO L85 PathProgramCache]: Analyzing trace with hash -1294612630, now seen corresponding path program 2 times [2024-11-14 03:26:39,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:26:39,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870538140] [2024-11-14 03:26:39,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:39,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:26:39,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:26:39,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1279183206] [2024-11-14 03:26:39,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:26:39,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:39,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:39,635 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:39,638 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 03:26:39,750 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:26:39,751 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:26:39,752 INFO L255 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 33 conjuncts are in the unsatisfiable core [2024-11-14 03:26:39,755 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:39,983 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 8 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2024-11-14 03:26:39,983 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:40,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:40,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870538140] [2024-11-14 03:26:40,090 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:26:40,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279183206] [2024-11-14 03:26:40,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279183206] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:26:40,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016819887] [2024-11-14 03:26:40,092 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:26:40,092 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:40,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:40,093 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:40,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:43,098 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 107 for LOIs [2024-11-14 03:26:43,231 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:43,232 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:26:47,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7032#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:26:47,887 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:26:47,887 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:26:47,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2024-11-14 03:26:47,887 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206931501] [2024-11-14 03:26:47,888 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:26:47,888 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-14 03:26:47,888 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:26:47,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-14 03:26:47,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=764, Unknown=0, NotChecked=0, Total=870 [2024-11-14 03:26:47,889 INFO L87 Difference]: Start difference. First operand 278 states and 350 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 4 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) [2024-11-14 03:26:48,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:26:48,111 INFO L93 Difference]: Finished difference Result 300 states and 377 transitions. [2024-11-14 03:26:48,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-14 03:26:48,112 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 4 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 60 [2024-11-14 03:26:48,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:26:48,114 INFO L225 Difference]: With dead ends: 300 [2024-11-14 03:26:48,114 INFO L226 Difference]: Without dead ends: 298 [2024-11-14 03:26:48,114 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 107 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=118, Invalid=874, Unknown=0, NotChecked=0, Total=992 [2024-11-14 03:26:48,115 INFO L432 NwaCegarLoop]: 37 mSDtfsCounter, 16 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:26:48,115 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 216 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:26:48,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2024-11-14 03:26:48,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 297. [2024-11-14 03:26:48,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 193 states have (on average 1.1917098445595855) internal successors, (230), 197 states have internal predecessors, (230), 73 states have call successors, (73), 30 states have call predecessors, (73), 30 states have return successors, (69), 69 states have call predecessors, (69), 69 states have call successors, (69) [2024-11-14 03:26:48,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 372 transitions. [2024-11-14 03:26:48,159 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 372 transitions. Word has length 60 [2024-11-14 03:26:48,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:26:48,159 INFO L471 AbstractCegarLoop]: Abstraction has 297 states and 372 transitions. [2024-11-14 03:26:48,159 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 4 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) [2024-11-14 03:26:48,159 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 372 transitions. [2024-11-14 03:26:48,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2024-11-14 03:26:48,160 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:26:48,160 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:26:48,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-14 03:26:48,364 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-14 03:26:48,364 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:26:48,364 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:26:48,364 INFO L85 PathProgramCache]: Analyzing trace with hash 695042292, now seen corresponding path program 3 times [2024-11-14 03:26:48,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:26:48,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621908874] [2024-11-14 03:26:48,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:26:48,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:26:48,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:26:48,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1803042816] [2024-11-14 03:26:48,384 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:26:48,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:48,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:48,386 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:48,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 03:26:48,459 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:26:48,459 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:26:48,460 INFO L255 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-14 03:26:48,462 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:49,054 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 31 proven. 13 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2024-11-14 03:26:49,055 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:52,487 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:52,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621908874] [2024-11-14 03:26:52,488 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:26:52,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803042816] [2024-11-14 03:26:52,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803042816] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:26:52,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [406352192] [2024-11-14 03:26:52,490 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:26:52,490 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:52,490 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:52,490 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:52,490 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:55,160 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 103 for LOIs [2024-11-14 03:26:55,287 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:26:55,288 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:27:00,889 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8271#(and (<= 2 ~counter~0) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:27:00,890 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:27:00,890 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:27:00,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2024-11-14 03:27:00,890 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734354688] [2024-11-14 03:27:00,890 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:27:00,891 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2024-11-14 03:27:00,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:27:00,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2024-11-14 03:27:00,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1017, Unknown=1, NotChecked=0, Total=1190 [2024-11-14 03:27:00,892 INFO L87 Difference]: Start difference. First operand 297 states and 372 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2024-11-14 03:27:01,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:27:01,585 INFO L93 Difference]: Finished difference Result 312 states and 386 transitions. [2024-11-14 03:27:01,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 03:27:01,586 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) Word has length 65 [2024-11-14 03:27:01,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:27:01,588 INFO L225 Difference]: With dead ends: 312 [2024-11-14 03:27:01,588 INFO L226 Difference]: Without dead ends: 308 [2024-11-14 03:27:01,589 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 114 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=199, Invalid=1206, Unknown=1, NotChecked=0, Total=1406 [2024-11-14 03:27:01,589 INFO L432 NwaCegarLoop]: 29 mSDtfsCounter, 38 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:27:01,590 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 176 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:27:01,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2024-11-14 03:27:01,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 307. [2024-11-14 03:27:01,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 201 states have (on average 1.1791044776119404) internal successors, (237), 204 states have internal predecessors, (237), 73 states have call successors, (73), 33 states have call predecessors, (73), 32 states have return successors, (69), 69 states have call predecessors, (69), 69 states have call successors, (69) [2024-11-14 03:27:01,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 379 transitions. [2024-11-14 03:27:01,636 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 379 transitions. Word has length 65 [2024-11-14 03:27:01,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:27:01,636 INFO L471 AbstractCegarLoop]: Abstraction has 307 states and 379 transitions. [2024-11-14 03:27:01,637 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2024-11-14 03:27:01,637 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 379 transitions. [2024-11-14 03:27:01,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2024-11-14 03:27:01,638 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:27:01,638 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:27:01,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2024-11-14 03:27:01,842 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-14 03:27:01,842 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:27:01,842 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:27:01,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1356849103, now seen corresponding path program 1 times [2024-11-14 03:27:01,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:27:01,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927338367] [2024-11-14 03:27:01,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:01,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:27:01,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:27:01,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [397341324] [2024-11-14 03:27:01,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:01,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:27:01,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:27:01,867 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:27:01,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 03:27:01,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:27:01,947 INFO L255 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 39 conjuncts are in the unsatisfiable core [2024-11-14 03:27:01,949 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:27:02,552 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 13 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2024-11-14 03:27:02,552 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:27:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 16 proven. 10 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2024-11-14 03:27:03,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:27:03,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927338367] [2024-11-14 03:27:03,372 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:27:03,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397341324] [2024-11-14 03:27:03,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397341324] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:27:03,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1102744426] [2024-11-14 03:27:03,374 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:27:03,374 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:27:03,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:27:03,374 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:27:03,374 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:27:11,682 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:27:11,686 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:27:11,687 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:27:13,625 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9695#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:27:13,625 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:27:13,625 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:27:13,625 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2024-11-14 03:27:13,625 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012645900] [2024-11-14 03:27:13,626 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:27:13,626 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:27:13,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:27:13,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:27:13,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1193, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 03:27:13,628 INFO L87 Difference]: Start difference. First operand 307 states and 379 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2024-11-14 03:27:17,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:27:17,598 INFO L93 Difference]: Finished difference Result 451 states and 614 transitions. [2024-11-14 03:27:17,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 03:27:17,599 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) Word has length 71 [2024-11-14 03:27:17,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:27:17,602 INFO L225 Difference]: With dead ends: 451 [2024-11-14 03:27:17,602 INFO L226 Difference]: Without dead ends: 444 [2024-11-14 03:27:17,603 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=378, Invalid=2702, Unknown=0, NotChecked=0, Total=3080 [2024-11-14 03:27:17,604 INFO L432 NwaCegarLoop]: 57 mSDtfsCounter, 136 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 461 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 513 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:27:17,604 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 513 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 461 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-11-14 03:27:17,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2024-11-14 03:27:17,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 407. [2024-11-14 03:27:17,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 260 states have (on average 1.2461538461538462) internal successors, (324), 263 states have internal predecessors, (324), 112 states have call successors, (112), 34 states have call predecessors, (112), 34 states have return successors, (110), 109 states have call predecessors, (110), 110 states have call successors, (110) [2024-11-14 03:27:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 546 transitions. [2024-11-14 03:27:17,704 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 546 transitions. Word has length 71 [2024-11-14 03:27:17,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:27:17,704 INFO L471 AbstractCegarLoop]: Abstraction has 407 states and 546 transitions. [2024-11-14 03:27:17,704 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 10 states have call successors, (25), 3 states have call predecessors, (25), 2 states have return successors, (24), 8 states have call predecessors, (24), 8 states have call successors, (24) [2024-11-14 03:27:17,704 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 546 transitions. [2024-11-14 03:27:17,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2024-11-14 03:27:17,705 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:27:17,706 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 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] [2024-11-14 03:27:17,720 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 03:27:17,906 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-14 03:27:17,906 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:27:17,906 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:27:17,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1564111963, now seen corresponding path program 4 times [2024-11-14 03:27:17,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:27:17,907 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089245144] [2024-11-14 03:27:17,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:17,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:27:17,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:27:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 239 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2024-11-14 03:27:18,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:27:18,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089245144] [2024-11-14 03:27:18,005 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089245144] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:27:18,005 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:27:18,005 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-14 03:27:18,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474954569] [2024-11-14 03:27:18,005 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:27:18,005 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-14 03:27:18,006 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:27:18,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-14 03:27:18,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-14 03:27:18,007 INFO L87 Difference]: Start difference. First operand 407 states and 546 transitions. Second operand has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2024-11-14 03:27:18,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:27:18,232 INFO L93 Difference]: Finished difference Result 607 states and 867 transitions. [2024-11-14 03:27:18,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-14 03:27:18,232 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 87 [2024-11-14 03:27:18,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:27:18,236 INFO L225 Difference]: With dead ends: 607 [2024-11-14 03:27:18,236 INFO L226 Difference]: Without dead ends: 459 [2024-11-14 03:27:18,237 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2024-11-14 03:27:18,238 INFO L432 NwaCegarLoop]: 50 mSDtfsCounter, 12 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:27:18,238 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 169 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:27:18,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2024-11-14 03:27:18,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 407. [2024-11-14 03:27:18,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 264 states have (on average 1.2424242424242424) internal successors, (328), 267 states have internal predecessors, (328), 108 states have call successors, (108), 34 states have call predecessors, (108), 34 states have return successors, (106), 105 states have call predecessors, (106), 106 states have call successors, (106) [2024-11-14 03:27:18,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 542 transitions. [2024-11-14 03:27:18,353 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 542 transitions. Word has length 87 [2024-11-14 03:27:18,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:27:18,353 INFO L471 AbstractCegarLoop]: Abstraction has 407 states and 542 transitions. [2024-11-14 03:27:18,353 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.6) internal successors, (28), 5 states have internal predecessors, (28), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2024-11-14 03:27:18,353 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 542 transitions. [2024-11-14 03:27:18,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-14 03:27:18,354 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:27:18,355 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:27:18,355 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2024-11-14 03:27:18,355 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:27:18,355 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:27:18,355 INFO L85 PathProgramCache]: Analyzing trace with hash 1019121120, now seen corresponding path program 1 times [2024-11-14 03:27:18,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:27:18,355 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043822883] [2024-11-14 03:27:18,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:18,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:27:18,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:27:18,379 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [637890886] [2024-11-14 03:27:18,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:18,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:27:18,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:27:18,382 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:27:18,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 03:27:18,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:27:18,475 INFO L255 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 52 conjuncts are in the unsatisfiable core [2024-11-14 03:27:18,478 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:27:19,584 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 68 proven. 33 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2024-11-14 03:27:19,584 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:28:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 68 proven. 30 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2024-11-14 03:28:08,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:28:08,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043822883] [2024-11-14 03:28:08,681 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:28:08,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637890886] [2024-11-14 03:28:08,681 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637890886] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:28:08,681 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1731604335] [2024-11-14 03:28:08,683 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:28:08,683 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:28:08,683 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:28:08,684 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:28:08,684 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:28:18,442 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:28:18,446 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:28:18,447 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:28:30,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13223#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:28:30,833 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:28:30,833 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:28:30,833 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 24 [2024-11-14 03:28:30,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984258170] [2024-11-14 03:28:30,834 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:28:30,834 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-14 03:28:30,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:28:30,834 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-14 03:28:30,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=1581, Unknown=2, NotChecked=0, Total=1806 [2024-11-14 03:28:30,835 INFO L87 Difference]: Start difference. First operand 407 states and 542 transitions. Second operand has 24 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 20 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 12 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-14 03:28:32,428 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.57s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [] [2024-11-14 03:28:40,334 WARN L286 SmtUtils]: Spent 5.80s on a formula simplification. DAG size of input: 76 DAG size of output: 75 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 03:28:48,352 WARN L286 SmtUtils]: Spent 5.70s on a formula simplification. DAG size of input: 67 DAG size of output: 66 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 03:28:50,580 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:28:53,609 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:01,879 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:07,237 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:09,240 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:11,345 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:25,642 WARN L286 SmtUtils]: Spent 7.29s on a formula simplification that was a NOOP. DAG size: 70 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 03:29:27,667 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:35,058 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:46,747 WARN L286 SmtUtils]: Spent 7.50s on a formula simplification that was a NOOP. DAG size: 79 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 03:29:48,763 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:29:56,846 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:30:01,811 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:30:07,287 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:30:09,349 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:30:09,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:09,363 INFO L93 Difference]: Finished difference Result 562 states and 791 transitions. [2024-11-14 03:30:09,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 03:30:09,364 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 20 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 12 states have call predecessors, (30), 10 states have call successors, (30) Word has length 88 [2024-11-14 03:30:09,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:09,369 INFO L225 Difference]: With dead ends: 562 [2024-11-14 03:30:09,369 INFO L226 Difference]: Without dead ends: 560 [2024-11-14 03:30:09,370 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 220 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1086 ImplicationChecksByTransitivity, 92.2s TimeCoverageRelationStatistics Valid=565, Invalid=3085, Unknown=10, NotChecked=0, Total=3660 [2024-11-14 03:30:09,371 INFO L432 NwaCegarLoop]: 41 mSDtfsCounter, 149 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 117 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 36.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 659 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 117 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 36.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:09,371 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 438 Invalid, 659 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [117 Valid, 530 Invalid, 12 Unknown, 0 Unchecked, 36.7s Time] [2024-11-14 03:30:09,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2024-11-14 03:30:09,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 528. [2024-11-14 03:30:09,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 528 states, 331 states have (on average 1.29607250755287) internal successors, (429), 338 states have internal predecessors, (429), 160 states have call successors, (160), 36 states have call predecessors, (160), 36 states have return successors, (158), 153 states have call predecessors, (158), 158 states have call successors, (158) [2024-11-14 03:30:09,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 528 states to 528 states and 747 transitions. [2024-11-14 03:30:09,719 INFO L78 Accepts]: Start accepts. Automaton has 528 states and 747 transitions. Word has length 88 [2024-11-14 03:30:09,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:09,720 INFO L471 AbstractCegarLoop]: Abstraction has 528 states and 747 transitions. [2024-11-14 03:30:09,720 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 20 states have internal predecessors, (48), 11 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 12 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-14 03:30:09,720 INFO L276 IsEmpty]: Start isEmpty. Operand 528 states and 747 transitions. [2024-11-14 03:30:09,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-11-14 03:30:09,723 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:09,724 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 3, 3, 3, 3, 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] [2024-11-14 03:30:09,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-14 03:30:09,928 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 03:30:09,928 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:09,928 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:09,928 INFO L85 PathProgramCache]: Analyzing trace with hash -704857568, now seen corresponding path program 1 times [2024-11-14 03:30:09,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:09,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58210714] [2024-11-14 03:30:09,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:09,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:09,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:10,088 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 46 proven. 11 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2024-11-14 03:30:10,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:10,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58210714] [2024-11-14 03:30:10,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58210714] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:10,089 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915585944] [2024-11-14 03:30:10,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:10,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:10,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:10,091 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:10,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 03:30:10,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:10,189 INFO L255 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-14 03:30:10,192 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:10,243 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 92 proven. 11 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2024-11-14 03:30:10,243 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:10,381 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 46 proven. 11 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2024-11-14 03:30:10,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915585944] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:30:10,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325996974] [2024-11-14 03:30:10,383 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2024-11-14 03:30:10,384 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:10,385 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:10,385 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:10,385 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:30:18,976 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:30:18,991 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:30:18,993 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:30:20,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15601#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:30:20,356 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:30:20,356 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:30:20,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 7 [2024-11-14 03:30:20,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482432510] [2024-11-14 03:30:20,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:30:20,357 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 03:30:20,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:30:20,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 03:30:20,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2024-11-14 03:30:20,358 INFO L87 Difference]: Start difference. First operand 528 states and 747 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2024-11-14 03:30:21,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:21,108 INFO L93 Difference]: Finished difference Result 692 states and 1010 transitions. [2024-11-14 03:30:21,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 03:30:21,108 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 103 [2024-11-14 03:30:21,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:21,113 INFO L225 Difference]: With dead ends: 692 [2024-11-14 03:30:21,113 INFO L226 Difference]: Without dead ends: 679 [2024-11-14 03:30:21,114 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 289 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=133, Invalid=1057, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 03:30:21,114 INFO L432 NwaCegarLoop]: 80 mSDtfsCounter, 30 mSDsluCounter, 299 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:21,115 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 379 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:30:21,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2024-11-14 03:30:21,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 542. [2024-11-14 03:30:21,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 542 states, 345 states have (on average 1.289855072463768) internal successors, (445), 352 states have internal predecessors, (445), 160 states have call successors, (160), 36 states have call predecessors, (160), 36 states have return successors, (158), 153 states have call predecessors, (158), 158 states have call successors, (158) [2024-11-14 03:30:21,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 542 states to 542 states and 763 transitions. [2024-11-14 03:30:21,446 INFO L78 Accepts]: Start accepts. Automaton has 542 states and 763 transitions. Word has length 103 [2024-11-14 03:30:21,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:21,446 INFO L471 AbstractCegarLoop]: Abstraction has 542 states and 763 transitions. [2024-11-14 03:30:21,446 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 7 states have internal predecessors, (31), 4 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2024-11-14 03:30:21,446 INFO L276 IsEmpty]: Start isEmpty. Operand 542 states and 763 transitions. [2024-11-14 03:30:21,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-11-14 03:30:21,448 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:21,448 INFO L215 NwaCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:30:21,468 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 03:30:21,652 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:21,652 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:21,652 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:21,652 INFO L85 PathProgramCache]: Analyzing trace with hash 332066041, now seen corresponding path program 1 times [2024-11-14 03:30:21,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:21,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213671930] [2024-11-14 03:30:21,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:21,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:21,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:21,964 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:30:21,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:21,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213671930] [2024-11-14 03:30:21,965 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213671930] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:21,965 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733780383] [2024-11-14 03:30:21,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:21,965 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:21,965 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:21,967 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:21,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 03:30:22,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:22,056 INFO L255 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 03:30:22,059 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:22,197 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 229 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2024-11-14 03:30:22,197 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:22,431 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 32 proven. 37 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2024-11-14 03:30:22,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733780383] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:30:22,431 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [764319337] [2024-11-14 03:30:22,433 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:30:22,433 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:22,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:22,433 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:22,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:30:30,807 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:30:30,809 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:30:30,810 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:30:31,587 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18208#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:30:31,587 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:30:31,587 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:30:31,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 10] total 20 [2024-11-14 03:30:31,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682792251] [2024-11-14 03:30:31,588 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:30:31,588 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:30:31,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:30:31,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:30:31,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=1010, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 03:30:31,590 INFO L87 Difference]: Start difference. First operand 542 states and 763 transitions. Second operand has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 10 states have call successors, (49), 6 states have call predecessors, (49), 5 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) [2024-11-14 03:30:33,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:33,262 INFO L93 Difference]: Finished difference Result 1835 states and 2624 transitions. [2024-11-14 03:30:33,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 03:30:33,263 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 10 states have call successors, (49), 6 states have call predecessors, (49), 5 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) Word has length 103 [2024-11-14 03:30:33,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:33,273 INFO L225 Difference]: With dead ends: 1835 [2024-11-14 03:30:33,273 INFO L226 Difference]: Without dead ends: 1544 [2024-11-14 03:30:33,276 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 283 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 776 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=508, Invalid=1844, Unknown=0, NotChecked=0, Total=2352 [2024-11-14 03:30:33,276 INFO L432 NwaCegarLoop]: 34 mSDtfsCounter, 228 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 228 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:33,277 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [228 Valid, 279 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:30:33,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1544 states. [2024-11-14 03:30:34,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1544 to 1476. [2024-11-14 03:30:34,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1476 states, 906 states have (on average 1.2229580573951435) internal successors, (1108), 933 states have internal predecessors, (1108), 453 states have call successors, (453), 116 states have call predecessors, (453), 116 states have return successors, (437), 426 states have call predecessors, (437), 437 states have call successors, (437) [2024-11-14 03:30:34,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1476 states to 1476 states and 1998 transitions. [2024-11-14 03:30:34,103 INFO L78 Accepts]: Start accepts. Automaton has 1476 states and 1998 transitions. Word has length 103 [2024-11-14 03:30:34,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:34,104 INFO L471 AbstractCegarLoop]: Abstraction has 1476 states and 1998 transitions. [2024-11-14 03:30:34,104 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 10 states have call successors, (49), 6 states have call predecessors, (49), 5 states have return successors, (48), 9 states have call predecessors, (48), 9 states have call successors, (48) [2024-11-14 03:30:34,104 INFO L276 IsEmpty]: Start isEmpty. Operand 1476 states and 1998 transitions. [2024-11-14 03:30:34,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2024-11-14 03:30:34,105 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:34,105 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 13, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:30:34,126 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-14 03:30:34,306 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2024-11-14 03:30:34,308 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:34,309 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:34,309 INFO L85 PathProgramCache]: Analyzing trace with hash 785094161, now seen corresponding path program 2 times [2024-11-14 03:30:34,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:34,309 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809369791] [2024-11-14 03:30:34,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:34,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:34,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:30:34,346 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [473458022] [2024-11-14 03:30:34,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:30:34,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:34,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:34,351 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:34,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-14 03:30:34,497 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:30:34,497 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:30:34,504 INFO L255 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 43 conjuncts are in the unsatisfiable core [2024-11-14 03:30:34,506 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:34,911 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 29 proven. 43 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2024-11-14 03:30:34,911 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:35,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:35,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809369791] [2024-11-14 03:30:35,134 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:30:35,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473458022] [2024-11-14 03:30:35,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473458022] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:35,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871535547] [2024-11-14 03:30:35,136 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:30:35,136 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:35,136 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:35,136 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:35,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:30:44,561 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:30:44,564 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:30:44,565 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:30:46,405 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23994#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:30:46,405 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:30:46,405 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:30:46,405 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2024-11-14 03:30:46,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058286696] [2024-11-14 03:30:46,405 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:30:46,405 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2024-11-14 03:30:46,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:30:46,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2024-11-14 03:30:46,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1058, Unknown=0, NotChecked=0, Total=1190 [2024-11-14 03:30:46,406 INFO L87 Difference]: Start difference. First operand 1476 states and 1998 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2024-11-14 03:30:47,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:47,924 INFO L93 Difference]: Finished difference Result 1705 states and 2338 transitions. [2024-11-14 03:30:47,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 03:30:47,925 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 105 [2024-11-14 03:30:47,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:47,934 INFO L225 Difference]: With dead ends: 1705 [2024-11-14 03:30:47,934 INFO L226 Difference]: Without dead ends: 1695 [2024-11-14 03:30:47,936 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=151, Invalid=1255, Unknown=0, NotChecked=0, Total=1406 [2024-11-14 03:30:47,936 INFO L432 NwaCegarLoop]: 40 mSDtfsCounter, 27 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:47,936 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 321 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 03:30:47,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1695 states. [2024-11-14 03:30:48,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1695 to 1670. [2024-11-14 03:30:48,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1670 states, 1020 states have (on average 1.2294117647058824) internal successors, (1254), 1045 states have internal predecessors, (1254), 525 states have call successors, (525), 124 states have call predecessors, (525), 124 states have return successors, (509), 500 states have call predecessors, (509), 509 states have call successors, (509) [2024-11-14 03:30:48,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 2288 transitions. [2024-11-14 03:30:48,992 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 2288 transitions. Word has length 105 [2024-11-14 03:30:48,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:48,992 INFO L471 AbstractCegarLoop]: Abstraction has 1670 states and 2288 transitions. [2024-11-14 03:30:48,993 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 10 states have internal predecessors, (32), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2024-11-14 03:30:48,993 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 2288 transitions. [2024-11-14 03:30:48,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2024-11-14 03:30:48,994 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:48,994 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:30:49,000 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-14 03:30:49,198 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-14 03:30:49,198 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:49,198 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:49,198 INFO L85 PathProgramCache]: Analyzing trace with hash 703299818, now seen corresponding path program 3 times [2024-11-14 03:30:49,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:49,198 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883692431] [2024-11-14 03:30:49,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:49,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:49,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:30:49,226 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1937319576] [2024-11-14 03:30:49,226 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:30:49,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:49,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:49,229 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:49,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-14 03:30:49,316 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:30:49,316 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:30:49,318 INFO L255 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-14 03:30:49,321 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:50,165 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 28 proven. 42 refuted. 0 times theorem prover too weak. 373 trivial. 0 not checked. [2024-11-14 03:30:50,165 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:51,563 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 28 proven. 39 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2024-11-14 03:30:51,563 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:51,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883692431] [2024-11-14 03:30:51,563 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:30:51,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937319576] [2024-11-14 03:30:51,563 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937319576] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:30:51,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017900739] [2024-11-14 03:30:51,565 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:30:51,565 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:51,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:51,566 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:51,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:31:00,048 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:31:00,051 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:31:00,052 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:31:02,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30012#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:31:02,216 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:31:02,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:31:02,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2024-11-14 03:31:02,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785348552] [2024-11-14 03:31:02,216 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:31:02,217 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:31:02,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:31:02,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:31:02,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1321, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 03:31:02,218 INFO L87 Difference]: Start difference. First operand 1670 states and 2288 transitions. Second operand has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 17 states have internal predecessors, (49), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2024-11-14 03:31:10,787 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 [] [2024-11-14 03:31:13,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:31:13,165 INFO L93 Difference]: Finished difference Result 2129 states and 2966 transitions. [2024-11-14 03:31:13,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2024-11-14 03:31:13,165 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 17 states have internal predecessors, (49), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) Word has length 106 [2024-11-14 03:31:13,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:31:13,176 INFO L225 Difference]: With dead ends: 2129 [2024-11-14 03:31:13,176 INFO L226 Difference]: Without dead ends: 2127 [2024-11-14 03:31:13,179 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 279 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1135 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=561, Invalid=3729, Unknown=0, NotChecked=0, Total=4290 [2024-11-14 03:31:13,180 INFO L432 NwaCegarLoop]: 71 mSDtfsCounter, 156 mSDsluCounter, 670 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 134 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2024-11-14 03:31:13,181 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 741 Invalid, 739 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 604 Invalid, 1 Unknown, 0 Unchecked, 5.9s Time] [2024-11-14 03:31:13,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2127 states. [2024-11-14 03:31:14,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2127 to 2018. [2024-11-14 03:31:14,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2018 states, 1217 states have (on average 1.2341824157764996) internal successors, (1502), 1241 states have internal predecessors, (1502), 657 states have call successors, (657), 143 states have call predecessors, (657), 143 states have return successors, (641), 633 states have call predecessors, (641), 641 states have call successors, (641) [2024-11-14 03:31:14,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2018 states to 2018 states and 2800 transitions. [2024-11-14 03:31:14,369 INFO L78 Accepts]: Start accepts. Automaton has 2018 states and 2800 transitions. Word has length 106 [2024-11-14 03:31:14,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:31:14,369 INFO L471 AbstractCegarLoop]: Abstraction has 2018 states and 2800 transitions. [2024-11-14 03:31:14,370 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 17 states have internal predecessors, (49), 12 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (36), 12 states have call predecessors, (36), 12 states have call successors, (36) [2024-11-14 03:31:14,370 INFO L276 IsEmpty]: Start isEmpty. Operand 2018 states and 2800 transitions. [2024-11-14 03:31:14,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2024-11-14 03:31:14,371 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:31:14,371 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:31:14,392 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-14 03:31:14,576 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-14 03:31:14,576 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:31:14,576 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:31:14,576 INFO L85 PathProgramCache]: Analyzing trace with hash -2117817619, now seen corresponding path program 4 times [2024-11-14 03:31:14,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:31:14,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195892128] [2024-11-14 03:31:14,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:31:14,577 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:31:14,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:31:14,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1976862743] [2024-11-14 03:31:14,602 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:31:14,602 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:31:14,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:31:14,605 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:31:14,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-14 03:31:14,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:31:14,707 INFO L255 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-14 03:31:14,713 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:31:15,816 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 57 proven. 59 refuted. 0 times theorem prover too weak. 334 trivial. 0 not checked. [2024-11-14 03:31:15,816 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:31:17,710 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 65 proven. 48 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2024-11-14 03:31:17,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:31:17,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195892128] [2024-11-14 03:31:17,710 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:31:17,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976862743] [2024-11-14 03:31:17,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976862743] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:31:17,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104944351] [2024-11-14 03:31:17,712 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:31:17,712 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:31:17,712 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:31:17,712 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:31:17,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:31:26,006 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:31:26,010 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:31:26,011 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:31:28,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37359#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:31:28,480 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:31:28,480 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:31:28,481 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 27 [2024-11-14 03:31:28,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819585363] [2024-11-14 03:31:28,481 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:31:28,481 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2024-11-14 03:31:28,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:31:28,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2024-11-14 03:31:28,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1834, Unknown=0, NotChecked=0, Total=2070 [2024-11-14 03:31:28,484 INFO L87 Difference]: Start difference. First operand 2018 states and 2800 transitions. Second operand has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2024-11-14 03:31:35,784 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 [] [2024-11-14 03:31:39,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:31:39,031 INFO L93 Difference]: Finished difference Result 2478 states and 3424 transitions. [2024-11-14 03:31:39,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 03:31:39,032 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) Word has length 110 [2024-11-14 03:31:39,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:31:39,048 INFO L225 Difference]: With dead ends: 2478 [2024-11-14 03:31:39,048 INFO L226 Difference]: Without dead ends: 2476 [2024-11-14 03:31:39,051 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 351 GetRequests, 284 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=665, Invalid=4027, Unknown=0, NotChecked=0, Total=4692 [2024-11-14 03:31:39,052 INFO L432 NwaCegarLoop]: 44 mSDtfsCounter, 159 mSDsluCounter, 687 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 157 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 731 SdHoareTripleChecker+Invalid, 937 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2024-11-14 03:31:39,053 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 731 Invalid, 937 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 779 Invalid, 1 Unknown, 0 Unchecked, 5.6s Time] [2024-11-14 03:31:39,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2476 states. [2024-11-14 03:31:40,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2476 to 2298. [2024-11-14 03:31:40,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2298 states, 1405 states have (on average 1.2320284697508896) internal successors, (1731), 1435 states have internal predecessors, (1731), 715 states have call successors, (715), 177 states have call predecessors, (715), 177 states have return successors, (699), 685 states have call predecessors, (699), 699 states have call successors, (699) [2024-11-14 03:31:41,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2298 states to 2298 states and 3145 transitions. [2024-11-14 03:31:41,007 INFO L78 Accepts]: Start accepts. Automaton has 2298 states and 3145 transitions. Word has length 110 [2024-11-14 03:31:41,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:31:41,008 INFO L471 AbstractCegarLoop]: Abstraction has 2298 states and 3145 transitions. [2024-11-14 03:31:41,008 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.3846153846153846) internal successors, (62), 24 states have internal predecessors, (62), 13 states have call successors, (37), 3 states have call predecessors, (37), 3 states have return successors, (36), 13 states have call predecessors, (36), 13 states have call successors, (36) [2024-11-14 03:31:41,008 INFO L276 IsEmpty]: Start isEmpty. Operand 2298 states and 3145 transitions. [2024-11-14 03:31:41,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2024-11-14 03:31:41,010 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:31:41,011 INFO L215 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:31:41,040 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2024-11-14 03:31:41,211 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-11-14 03:31:41,212 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:31:41,212 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:31:41,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1242095667, now seen corresponding path program 1 times [2024-11-14 03:31:41,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:31:41,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685333462] [2024-11-14 03:31:41,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:31:41,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:31:41,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:31:41,596 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 50 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2024-11-14 03:31:41,596 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:31:41,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685333462] [2024-11-14 03:31:41,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685333462] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:31:41,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297310310] [2024-11-14 03:31:41,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:31:41,597 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:31:41,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:31:41,603 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:31:41,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-14 03:31:41,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:31:41,704 INFO L255 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 15 conjuncts are in the unsatisfiable core [2024-11-14 03:31:41,707 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:31:41,867 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 434 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2024-11-14 03:31:41,867 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:31:42,065 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 32 proven. 50 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2024-11-14 03:31:42,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297310310] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:31:42,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1542921348] [2024-11-14 03:31:42,067 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:31:42,067 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:31:42,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:31:42,067 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:31:42,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:31:50,717 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:31:50,719 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:31:50,720 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:31:52,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45735#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:31:52,356 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:31:52,356 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:31:52,356 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 10] total 20 [2024-11-14 03:31:52,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914643737] [2024-11-14 03:31:52,356 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:31:52,357 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:31:52,357 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:31:52,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:31:52,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=323, Invalid=1083, Unknown=0, NotChecked=0, Total=1406 [2024-11-14 03:31:52,358 INFO L87 Difference]: Start difference. First operand 2298 states and 3145 transitions. Second operand has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 12 states have call successors, (61), 7 states have call predecessors, (61), 6 states have return successors, (60), 11 states have call predecessors, (60), 11 states have call successors, (60) [2024-11-14 03:31:54,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:31:54,132 INFO L93 Difference]: Finished difference Result 2386 states and 3238 transitions. [2024-11-14 03:31:54,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-14 03:31:54,133 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 12 states have call successors, (61), 7 states have call predecessors, (61), 6 states have return successors, (60), 11 states have call predecessors, (60), 11 states have call successors, (60) Word has length 120 [2024-11-14 03:31:54,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:31:54,142 INFO L225 Difference]: With dead ends: 2386 [2024-11-14 03:31:54,142 INFO L226 Difference]: Without dead ends: 2326 [2024-11-14 03:31:54,144 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 333 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=493, Invalid=1859, Unknown=0, NotChecked=0, Total=2352 [2024-11-14 03:31:54,145 INFO L432 NwaCegarLoop]: 35 mSDtfsCounter, 223 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:31:54,145 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 270 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 03:31:54,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2326 states. [2024-11-14 03:31:55,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2326 to 2312. [2024-11-14 03:31:55,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2312 states, 1422 states have (on average 1.2032348804500703) internal successors, (1711), 1450 states have internal predecessors, (1711), 713 states have call successors, (713), 177 states have call predecessors, (713), 176 states have return successors, (698), 684 states have call predecessors, (698), 698 states have call successors, (698) [2024-11-14 03:31:55,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2312 states to 2312 states and 3122 transitions. [2024-11-14 03:31:55,484 INFO L78 Accepts]: Start accepts. Automaton has 2312 states and 3122 transitions. Word has length 120 [2024-11-14 03:31:55,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:31:55,485 INFO L471 AbstractCegarLoop]: Abstraction has 2312 states and 3122 transitions. [2024-11-14 03:31:55,485 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.6) internal successors, (72), 20 states have internal predecessors, (72), 12 states have call successors, (61), 7 states have call predecessors, (61), 6 states have return successors, (60), 11 states have call predecessors, (60), 11 states have call successors, (60) [2024-11-14 03:31:55,485 INFO L276 IsEmpty]: Start isEmpty. Operand 2312 states and 3122 transitions. [2024-11-14 03:31:55,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2024-11-14 03:31:55,487 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:31:55,487 INFO L215 NwaCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:31:55,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2024-11-14 03:31:55,691 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2024-11-14 03:31:55,691 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:31:55,691 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:31:55,691 INFO L85 PathProgramCache]: Analyzing trace with hash -155403156, now seen corresponding path program 2 times [2024-11-14 03:31:55,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:31:55,691 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970437696] [2024-11-14 03:31:55,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:31:55,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:31:55,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:31:55,716 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [859797476] [2024-11-14 03:31:55,716 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:31:55,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:31:55,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:31:55,719 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:31:55,721 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-14 03:31:55,810 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:31:55,810 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:31:55,812 INFO L255 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 67 conjuncts are in the unsatisfiable core [2024-11-14 03:31:55,815 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:31:56,819 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 75 proven. 58 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2024-11-14 03:31:56,819 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:32:00,066 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 73 proven. 56 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2024-11-14 03:32:00,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:32:00,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970437696] [2024-11-14 03:32:00,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:32:00,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859797476] [2024-11-14 03:32:00,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859797476] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:32:00,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1503251489] [2024-11-14 03:32:00,068 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:32:00,068 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:32:00,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:32:00,068 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:32:00,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:32:08,115 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:32:08,118 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:32:08,118 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:32:10,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53961#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:32:10,955 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:32:10,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:32:10,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 29 [2024-11-14 03:32:10,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291769139] [2024-11-14 03:32:10,955 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:32:10,956 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 03:32:10,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:32:10,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 03:32:10,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2024-11-14 03:32:10,957 INFO L87 Difference]: Start difference. First operand 2312 states and 3122 transitions. Second operand has 29 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 26 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2024-11-14 03:32:15,306 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2024-11-14 03:32:23,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:32:23,000 INFO L93 Difference]: Finished difference Result 2594 states and 3539 transitions. [2024-11-14 03:32:23,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 03:32:23,001 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 26 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) Word has length 121 [2024-11-14 03:32:23,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:32:23,009 INFO L225 Difference]: With dead ends: 2594 [2024-11-14 03:32:23,009 INFO L226 Difference]: Without dead ends: 2581 [2024-11-14 03:32:23,011 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1580 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=912, Invalid=5250, Unknown=0, NotChecked=0, Total=6162 [2024-11-14 03:32:23,011 INFO L432 NwaCegarLoop]: 67 mSDtfsCounter, 228 mSDsluCounter, 786 mSDsCounter, 0 mSdLazyCounter, 937 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 229 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 1187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 937 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:32:23,011 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [229 Valid, 853 Invalid, 1187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 937 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2024-11-14 03:32:23,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2581 states. [2024-11-14 03:32:24,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2581 to 2539. [2024-11-14 03:32:24,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2539 states, 1566 states have (on average 1.2043422733077906) internal successors, (1886), 1593 states have internal predecessors, (1886), 783 states have call successors, (783), 189 states have call predecessors, (783), 189 states have return successors, (775), 756 states have call predecessors, (775), 775 states have call successors, (775) [2024-11-14 03:32:24,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2539 states to 2539 states and 3444 transitions. [2024-11-14 03:32:24,769 INFO L78 Accepts]: Start accepts. Automaton has 2539 states and 3444 transitions. Word has length 121 [2024-11-14 03:32:24,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:32:24,769 INFO L471 AbstractCegarLoop]: Abstraction has 2539 states and 3444 transitions. [2024-11-14 03:32:24,770 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 26 states have internal predecessors, (64), 15 states have call successors, (41), 3 states have call predecessors, (41), 3 states have return successors, (40), 13 states have call predecessors, (40), 13 states have call successors, (40) [2024-11-14 03:32:24,770 INFO L276 IsEmpty]: Start isEmpty. Operand 2539 states and 3444 transitions. [2024-11-14 03:32:24,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2024-11-14 03:32:24,771 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:32:24,771 INFO L215 NwaCegarLoop]: trace histogram [18, 17, 17, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:32:24,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2024-11-14 03:32:24,971 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:24,971 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:32:24,972 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:32:24,972 INFO L85 PathProgramCache]: Analyzing trace with hash 46679805, now seen corresponding path program 5 times [2024-11-14 03:32:24,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:32:24,972 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363771173] [2024-11-14 03:32:24,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:32:24,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:32:24,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:32:24,994 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [314611761] [2024-11-14 03:32:24,995 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:32:24,995 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:24,995 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:32:24,997 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:32:25,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-14 03:32:25,125 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:32:25,125 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:32:25,127 INFO L255 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 50 conjuncts are in the unsatisfiable core [2024-11-14 03:32:25,129 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:32:25,639 INFO L134 CoverageAnalysis]: Checked inductivity of 658 backedges. 78 proven. 75 refuted. 0 times theorem prover too weak. 505 trivial. 0 not checked. [2024-11-14 03:32:25,639 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:32:25,863 INFO L134 CoverageAnalysis]: Checked inductivity of 658 backedges. 104 proven. 7 refuted. 0 times theorem prover too weak. 547 trivial. 0 not checked. [2024-11-14 03:32:25,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:32:25,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363771173] [2024-11-14 03:32:25,864 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:32:25,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314611761] [2024-11-14 03:32:25,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314611761] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:32:25,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [438704688] [2024-11-14 03:32:25,865 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:32:25,865 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:32:25,865 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:32:25,865 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:32:25,865 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:32:34,111 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:32:34,115 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:32:34,116 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:32:36,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62947#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:32:36,053 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:32:36,053 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:32:36,054 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 7] total 19 [2024-11-14 03:32:36,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823041216] [2024-11-14 03:32:36,054 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:32:36,054 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-14 03:32:36,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:32:36,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-14 03:32:36,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1268, Unknown=0, NotChecked=0, Total=1406 [2024-11-14 03:32:36,055 INFO L87 Difference]: Start difference. First operand 2539 states and 3444 transitions. Second operand has 19 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 18 states have internal predecessors, (58), 10 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-14 03:32:39,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:32:39,247 INFO L93 Difference]: Finished difference Result 2780 states and 3753 transitions. [2024-11-14 03:32:39,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 03:32:39,248 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 18 states have internal predecessors, (58), 10 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) Word has length 128 [2024-11-14 03:32:39,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:32:39,261 INFO L225 Difference]: With dead ends: 2780 [2024-11-14 03:32:39,262 INFO L226 Difference]: Without dead ends: 2730 [2024-11-14 03:32:39,264 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 417 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=200, Invalid=1870, Unknown=0, NotChecked=0, Total=2070 [2024-11-14 03:32:39,264 INFO L432 NwaCegarLoop]: 55 mSDtfsCounter, 69 mSDsluCounter, 576 mSDsCounter, 0 mSdLazyCounter, 610 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 631 SdHoareTripleChecker+Invalid, 670 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 610 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-14 03:32:39,265 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 631 Invalid, 670 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 610 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-14 03:32:39,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2730 states. [2024-11-14 03:32:41,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2730 to 2588. [2024-11-14 03:32:41,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2588 states, 1611 states have (on average 1.1893234016139045) internal successors, (1916), 1632 states have internal predecessors, (1916), 772 states have call successors, (772), 204 states have call predecessors, (772), 204 states have return successors, (765), 751 states have call predecessors, (765), 765 states have call successors, (765) [2024-11-14 03:32:41,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2588 states to 2588 states and 3453 transitions. [2024-11-14 03:32:41,279 INFO L78 Accepts]: Start accepts. Automaton has 2588 states and 3453 transitions. Word has length 128 [2024-11-14 03:32:41,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:32:41,279 INFO L471 AbstractCegarLoop]: Abstraction has 2588 states and 3453 transitions. [2024-11-14 03:32:41,279 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 3.2222222222222223) internal successors, (58), 18 states have internal predecessors, (58), 10 states have call successors, (31), 3 states have call predecessors, (31), 3 states have return successors, (30), 10 states have call predecessors, (30), 10 states have call successors, (30) [2024-11-14 03:32:41,279 INFO L276 IsEmpty]: Start isEmpty. Operand 2588 states and 3453 transitions. [2024-11-14 03:32:41,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2024-11-14 03:32:41,281 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:32:41,281 INFO L215 NwaCegarLoop]: trace histogram [20, 19, 19, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:32:41,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-14 03:32:41,481 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:41,481 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:32:41,481 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:32:41,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1982652131, now seen corresponding path program 6 times [2024-11-14 03:32:41,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:32:41,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050563324] [2024-11-14 03:32:41,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:32:41,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:32:41,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:32:41,512 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [46650916] [2024-11-14 03:32:41,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:32:41,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:41,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:32:41,516 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:32:41,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-14 03:32:41,640 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:32:41,640 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:32:41,643 INFO L255 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 71 conjuncts are in the unsatisfiable core [2024-11-14 03:32:41,648 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:32:44,814 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 143 proven. 118 refuted. 0 times theorem prover too weak. 549 trivial. 0 not checked. [2024-11-14 03:32:44,814 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:32:46,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:32:46,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050563324] [2024-11-14 03:32:46,276 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:32:46,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46650916] [2024-11-14 03:32:46,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46650916] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:32:46,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624493747] [2024-11-14 03:32:46,277 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:32:46,277 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:32:46,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:32:46,278 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:32:46,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:32:54,151 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:32:54,154 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:32:54,155 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:33:00,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71982#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:33:00,101 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:33:00,101 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:33:00,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-11-14 03:33:00,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422232285] [2024-11-14 03:33:00,101 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:33:00,101 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-14 03:33:00,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:33:00,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-14 03:33:00,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1929, Unknown=1, NotChecked=0, Total=2162 [2024-11-14 03:33:00,103 INFO L87 Difference]: Start difference. First operand 2588 states and 3453 transitions. Second operand has 21 states, 19 states have (on average 2.0) internal successors, (38), 16 states have internal predecessors, (38), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) [2024-11-14 03:33:06,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:33:06,053 INFO L93 Difference]: Finished difference Result 2620 states and 3478 transitions. [2024-11-14 03:33:06,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 03:33:06,054 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0) internal successors, (38), 16 states have internal predecessors, (38), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) Word has length 138 [2024-11-14 03:33:06,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:33:06,063 INFO L225 Difference]: With dead ends: 2620 [2024-11-14 03:33:06,063 INFO L226 Difference]: Without dead ends: 2618 [2024-11-14 03:33:06,064 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 257 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=321, Invalid=2758, Unknown=1, NotChecked=0, Total=3080 [2024-11-14 03:33:06,065 INFO L432 NwaCegarLoop]: 57 mSDtfsCounter, 62 mSDsluCounter, 710 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 767 SdHoareTripleChecker+Invalid, 802 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:33:06,065 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 767 Invalid, 802 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 766 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2024-11-14 03:33:06,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2618 states. [2024-11-14 03:33:07,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2618 to 2612. [2024-11-14 03:33:07,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2612 states, 1629 states have (on average 1.1866175567833026) internal successors, (1933), 1650 states have internal predecessors, (1933), 772 states have call successors, (772), 210 states have call predecessors, (772), 210 states have return successors, (765), 751 states have call predecessors, (765), 765 states have call successors, (765) [2024-11-14 03:33:07,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2612 states to 2612 states and 3470 transitions. [2024-11-14 03:33:07,930 INFO L78 Accepts]: Start accepts. Automaton has 2612 states and 3470 transitions. Word has length 138 [2024-11-14 03:33:07,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:33:07,930 INFO L471 AbstractCegarLoop]: Abstraction has 2612 states and 3470 transitions. [2024-11-14 03:33:07,931 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0) internal successors, (38), 16 states have internal predecessors, (38), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 10 states have call predecessors, (23), 9 states have call successors, (23) [2024-11-14 03:33:07,931 INFO L276 IsEmpty]: Start isEmpty. Operand 2612 states and 3470 transitions. [2024-11-14 03:33:07,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2024-11-14 03:33:07,933 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:33:07,933 INFO L215 NwaCegarLoop]: trace histogram [24, 23, 23, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:33:07,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-14 03:33:08,137 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:33:08,137 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:33:08,137 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:33:08,137 INFO L85 PathProgramCache]: Analyzing trace with hash -545590511, now seen corresponding path program 7 times [2024-11-14 03:33:08,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:33:08,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011968740] [2024-11-14 03:33:08,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:33:08,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:33:08,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:33:08,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1757685435] [2024-11-14 03:33:08,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:33:08,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:33:08,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:33:08,174 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:33:08,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-14 03:33:08,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:33:08,316 INFO L255 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 53 conjuncts are in the unsatisfiable core [2024-11-14 03:33:08,320 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:33:11,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 116 proven. 169 refuted. 0 times theorem prover too weak. 895 trivial. 0 not checked. [2024-11-14 03:33:11,909 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:33:12,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:33:12,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011968740] [2024-11-14 03:33:12,228 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:33:12,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757685435] [2024-11-14 03:33:12,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757685435] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:33:12,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368743164] [2024-11-14 03:33:12,230 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:33:12,230 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:33:12,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:33:12,230 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:33:12,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:33:23,262 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:33:23,267 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:33:23,269 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:33:28,033 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80787#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:33:28,033 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:33:28,033 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:33:28,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-14 03:33:28,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039656621] [2024-11-14 03:33:28,033 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:33:28,034 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:33:28,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:33:28,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:33:28,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 03:33:28,035 INFO L87 Difference]: Start difference. First operand 2612 states and 3470 transitions. Second operand has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 10 states have call predecessors, (27), 9 states have call successors, (27) [2024-11-14 03:33:32,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:33:32,405 INFO L93 Difference]: Finished difference Result 2687 states and 3550 transitions. [2024-11-14 03:33:32,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 03:33:32,406 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 10 states have call predecessors, (27), 9 states have call successors, (27) Word has length 161 [2024-11-14 03:33:32,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:33:32,416 INFO L225 Difference]: With dead ends: 2687 [2024-11-14 03:33:32,417 INFO L226 Difference]: Without dead ends: 2683 [2024-11-14 03:33:32,418 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 286 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=217, Invalid=2233, Unknown=0, NotChecked=0, Total=2450 [2024-11-14 03:33:32,418 INFO L432 NwaCegarLoop]: 63 mSDtfsCounter, 67 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2024-11-14 03:33:32,418 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 676 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2024-11-14 03:33:32,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2683 states. [2024-11-14 03:33:34,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2683 to 2677. [2024-11-14 03:33:34,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2677 states, 1672 states have (on average 1.1836124401913874) internal successors, (1979), 1692 states have internal predecessors, (1979), 784 states have call successors, (784), 221 states have call predecessors, (784), 220 states have return successors, (777), 763 states have call predecessors, (777), 777 states have call successors, (777) [2024-11-14 03:33:34,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2677 states to 2677 states and 3540 transitions. [2024-11-14 03:33:34,589 INFO L78 Accepts]: Start accepts. Automaton has 2677 states and 3540 transitions. Word has length 161 [2024-11-14 03:33:34,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:33:34,590 INFO L471 AbstractCegarLoop]: Abstraction has 2677 states and 3540 transitions. [2024-11-14 03:33:34,590 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 10 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 10 states have call predecessors, (27), 9 states have call successors, (27) [2024-11-14 03:33:34,590 INFO L276 IsEmpty]: Start isEmpty. Operand 2677 states and 3540 transitions. [2024-11-14 03:33:34,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2024-11-14 03:33:34,592 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:33:34,592 INFO L215 NwaCegarLoop]: trace histogram [25, 24, 24, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:33:34,615 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2024-11-14 03:33:34,792 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-14 03:33:34,793 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:33:34,793 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:33:34,793 INFO L85 PathProgramCache]: Analyzing trace with hash -1500632046, now seen corresponding path program 3 times [2024-11-14 03:33:34,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:33:34,793 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622975913] [2024-11-14 03:33:34,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:33:34,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:33:34,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:33:34,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [433828521] [2024-11-14 03:33:34,823 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:33:34,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:33:34,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:33:34,825 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:33:34,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-14 03:33:34,960 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:33:34,960 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:33:34,963 INFO L255 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 53 conjuncts are in the unsatisfiable core [2024-11-14 03:33:34,968 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:33:37,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1279 backedges. 113 proven. 122 refuted. 0 times theorem prover too weak. 1044 trivial. 0 not checked. [2024-11-14 03:33:37,542 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:33:40,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:33:40,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622975913] [2024-11-14 03:33:40,739 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:33:40,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433828521] [2024-11-14 03:33:40,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [433828521] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:33:40,740 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [276362274] [2024-11-14 03:33:40,741 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:33:40,741 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:33:40,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:33:40,741 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:33:40,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:33:50,327 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:33:50,331 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:33:50,332 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:33:54,456 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '89848#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:33:54,457 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:33:54,457 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:33:54,457 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-14 03:33:54,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279500573] [2024-11-14 03:33:54,457 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:33:54,457 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:33:54,457 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:33:54,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:33:54,458 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1582, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 03:33:54,458 INFO L87 Difference]: Start difference. First operand 2677 states and 3540 transitions. Second operand has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 11 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (28), 9 states have call predecessors, (28), 10 states have call successors, (28) [2024-11-14 03:34:00,295 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 [] [2024-11-14 03:34:05,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:34:05,287 INFO L93 Difference]: Finished difference Result 2760 states and 3633 transitions. [2024-11-14 03:34:05,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 03:34:05,288 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 11 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (28), 9 states have call predecessors, (28), 10 states have call successors, (28) Word has length 167 [2024-11-14 03:34:05,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:34:05,301 INFO L225 Difference]: With dead ends: 2760 [2024-11-14 03:34:05,302 INFO L226 Difference]: Without dead ends: 2755 [2024-11-14 03:34:05,303 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=209, Invalid=2443, Unknown=0, NotChecked=0, Total=2652 [2024-11-14 03:34:05,304 INFO L432 NwaCegarLoop]: 65 mSDtfsCounter, 65 mSDsluCounter, 578 mSDsCounter, 0 mSdLazyCounter, 999 mSolverCounterSat, 47 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 643 SdHoareTripleChecker+Invalid, 1047 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 999 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2024-11-14 03:34:05,304 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 643 Invalid, 1047 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 999 Invalid, 1 Unknown, 0 Unchecked, 7.5s Time] [2024-11-14 03:34:05,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2755 states. [2024-11-14 03:34:07,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2755 to 2718. [2024-11-14 03:34:07,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2718 states, 1703 states have (on average 1.17968291250734) internal successors, (2009), 1723 states have internal predecessors, (2009), 783 states have call successors, (783), 231 states have call predecessors, (783), 231 states have return successors, (777), 763 states have call predecessors, (777), 777 states have call successors, (777) [2024-11-14 03:34:07,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2718 states to 2718 states and 3569 transitions. [2024-11-14 03:34:07,279 INFO L78 Accepts]: Start accepts. Automaton has 2718 states and 3569 transitions. Word has length 167 [2024-11-14 03:34:07,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:34:07,280 INFO L471 AbstractCegarLoop]: Abstraction has 2718 states and 3569 transitions. [2024-11-14 03:34:07,280 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 11 states have call successors, (29), 2 states have call predecessors, (29), 3 states have return successors, (28), 9 states have call predecessors, (28), 10 states have call successors, (28) [2024-11-14 03:34:07,280 INFO L276 IsEmpty]: Start isEmpty. Operand 2718 states and 3569 transitions. [2024-11-14 03:34:07,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2024-11-14 03:34:07,283 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:34:07,283 INFO L215 NwaCegarLoop]: trace histogram [27, 26, 26, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:34:07,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-14 03:34:07,488 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-14 03:34:07,488 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:34:07,488 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:34:07,488 INFO L85 PathProgramCache]: Analyzing trace with hash -434481471, now seen corresponding path program 8 times [2024-11-14 03:34:07,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:34:07,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827632564] [2024-11-14 03:34:07,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:34:07,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:34:07,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:34:07,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [148199091] [2024-11-14 03:34:07,517 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:34:07,517 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:34:07,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:34:07,519 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:34:07,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-14 03:34:07,724 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:34:07,724 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:34:07,727 INFO L255 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 59 conjuncts are in the unsatisfiable core [2024-11-14 03:34:07,731 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:34:09,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1509 backedges. 182 proven. 138 refuted. 0 times theorem prover too weak. 1189 trivial. 0 not checked. [2024-11-14 03:34:09,729 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:34:11,183 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:34:11,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827632564] [2024-11-14 03:34:11,183 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:34:11,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148199091] [2024-11-14 03:34:11,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148199091] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:34:11,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550462634] [2024-11-14 03:34:11,185 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:34:11,185 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:34:11,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:34:11,185 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:34:11,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:34:19,719 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:34:19,724 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:34:19,725 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:34:22,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99186#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:34:22,471 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:34:22,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:34:22,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2024-11-14 03:34:22,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922575988] [2024-11-14 03:34:22,471 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:34:22,471 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2024-11-14 03:34:22,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:34:22,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2024-11-14 03:34:22,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=1535, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 03:34:22,473 INFO L87 Difference]: Start difference. First operand 2718 states and 3569 transitions. Second operand has 16 states, 16 states have (on average 2.375) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) [2024-11-14 03:34:25,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:34:25,824 INFO L93 Difference]: Finished difference Result 2932 states and 3833 transitions. [2024-11-14 03:34:25,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 03:34:25,825 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) Word has length 179 [2024-11-14 03:34:25,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:34:25,838 INFO L225 Difference]: With dead ends: 2932 [2024-11-14 03:34:25,838 INFO L226 Difference]: Without dead ends: 2930 [2024-11-14 03:34:25,839 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=250, Invalid=2006, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 03:34:25,840 INFO L432 NwaCegarLoop]: 60 mSDtfsCounter, 34 mSDsluCounter, 509 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:34:25,840 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 569 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-14 03:34:25,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2930 states. [2024-11-14 03:34:27,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2930 to 2912. [2024-11-14 03:34:27,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2912 states, 1821 states have (on average 1.1768259198242723) internal successors, (2143), 1836 states have internal predecessors, (2143), 836 states have call successors, (836), 254 states have call predecessors, (836), 254 states have return successors, (830), 821 states have call predecessors, (830), 830 states have call successors, (830) [2024-11-14 03:34:27,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2912 states to 2912 states and 3809 transitions. [2024-11-14 03:34:27,953 INFO L78 Accepts]: Start accepts. Automaton has 2912 states and 3809 transitions. Word has length 179 [2024-11-14 03:34:27,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:34:27,954 INFO L471 AbstractCegarLoop]: Abstraction has 2912 states and 3809 transitions. [2024-11-14 03:34:27,954 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.375) internal successors, (38), 14 states have internal predecessors, (38), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 7 states have call predecessors, (22), 8 states have call successors, (22) [2024-11-14 03:34:27,954 INFO L276 IsEmpty]: Start isEmpty. Operand 2912 states and 3809 transitions. [2024-11-14 03:34:27,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2024-11-14 03:34:27,957 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:34:27,957 INFO L215 NwaCegarLoop]: trace histogram [27, 26, 26, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:34:27,965 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-14 03:34:28,162 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:34:28,172 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:34:28,172 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:34:28,172 INFO L85 PathProgramCache]: Analyzing trace with hash 814295032, now seen corresponding path program 9 times [2024-11-14 03:34:28,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:34:28,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448363608] [2024-11-14 03:34:28,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:34:28,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:34:28,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:34:28,212 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2047670700] [2024-11-14 03:34:28,213 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:34:28,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:34:28,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:34:28,215 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:34:28,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-14 03:34:28,357 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:34:28,358 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:34:28,365 INFO L255 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-14 03:34:28,369 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:34:43,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 131 proven. 224 refuted. 0 times theorem prover too weak. 1165 trivial. 0 not checked. [2024-11-14 03:34:43,694 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:34:49,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:34:49,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448363608] [2024-11-14 03:34:49,685 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:34:49,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047670700] [2024-11-14 03:34:49,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047670700] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:34:49,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1959594533] [2024-11-14 03:34:49,687 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:34:49,687 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:34:49,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:34:49,687 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:34:49,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:34:58,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:34:58,991 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:34:58,992 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:35:09,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109081#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:35:09,175 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:35:09,175 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:35:09,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2024-11-14 03:35:09,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80756642] [2024-11-14 03:35:09,175 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:35:09,176 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-14 03:35:09,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:35:09,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-14 03:35:09,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=2146, Unknown=1, NotChecked=0, Total=2352 [2024-11-14 03:35:09,177 INFO L87 Difference]: Start difference. First operand 2912 states and 3809 transitions. Second operand has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 20 states have internal predecessors, (48), 12 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 12 states have call successors, (30) [2024-11-14 03:35:20,530 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.00s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-14 03:35:29,703 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-14 03:35:32,000 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.84s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [0] [2024-11-14 03:35:45,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:35:45,299 INFO L93 Difference]: Finished difference Result 3027 states and 3941 transitions. [2024-11-14 03:35:45,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-14 03:35:45,300 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 20 states have internal predecessors, (48), 12 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 12 states have call successors, (30) Word has length 183 [2024-11-14 03:35:45,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:35:45,316 INFO L225 Difference]: With dead ends: 3027 [2024-11-14 03:35:45,316 INFO L226 Difference]: Without dead ends: 3025 [2024-11-14 03:35:45,318 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 405 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1007 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=318, Invalid=3462, Unknown=2, NotChecked=0, Total=3782 [2024-11-14 03:35:45,319 INFO L432 NwaCegarLoop]: 67 mSDtfsCounter, 69 mSDsluCounter, 660 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 45 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 727 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:35:45,319 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 727 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1123 Invalid, 1 Unknown, 0 Unchecked, 20.4s Time] [2024-11-14 03:35:45,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3025 states. [2024-11-14 03:35:47,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3025 to 3001. [2024-11-14 03:35:47,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3001 states, 1877 states have (on average 1.1742141715503462) internal successors, (2204), 1892 states have internal predecessors, (2204), 856 states have call successors, (856), 267 states have call predecessors, (856), 267 states have return successors, (850), 841 states have call predecessors, (850), 850 states have call successors, (850) [2024-11-14 03:35:47,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3001 states to 3001 states and 3910 transitions. [2024-11-14 03:35:47,803 INFO L78 Accepts]: Start accepts. Automaton has 3001 states and 3910 transitions. Word has length 183 [2024-11-14 03:35:47,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:35:47,804 INFO L471 AbstractCegarLoop]: Abstraction has 3001 states and 3910 transitions. [2024-11-14 03:35:47,804 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0869565217391304) internal successors, (48), 20 states have internal predecessors, (48), 12 states have call successors, (31), 2 states have call predecessors, (31), 3 states have return successors, (30), 11 states have call predecessors, (30), 12 states have call successors, (30) [2024-11-14 03:35:47,805 INFO L276 IsEmpty]: Start isEmpty. Operand 3001 states and 3910 transitions. [2024-11-14 03:35:47,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2024-11-14 03:35:47,808 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:35:47,808 INFO L215 NwaCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:35:47,832 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2024-11-14 03:35:48,012 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:35:48,012 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:35:48,013 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:35:48,013 INFO L85 PathProgramCache]: Analyzing trace with hash 1172179747, now seen corresponding path program 10 times [2024-11-14 03:35:48,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:35:48,013 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902755267] [2024-11-14 03:35:48,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:35:48,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:35:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:35:48,060 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [499978013] [2024-11-14 03:35:48,060 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:35:48,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:35:48,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:35:48,066 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:35:48,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-14 03:35:48,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:35:48,241 INFO L255 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-14 03:35:48,246 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:35:52,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1621 backedges. 131 proven. 155 refuted. 0 times theorem prover too weak. 1335 trivial. 0 not checked. [2024-11-14 03:35:52,651 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:35:53,340 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:35:53,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902755267] [2024-11-14 03:35:53,340 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:35:53,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499978013] [2024-11-14 03:35:53,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499978013] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:35:53,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032068182] [2024-11-14 03:35:53,342 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:35:53,342 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:35:53,342 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:35:53,342 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:35:53,343 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:36:03,821 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:36:03,826 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:36:03,827 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:36:07,783 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119216#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:36:07,783 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:36:07,783 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:36:07,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2024-11-14 03:36:07,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524448657] [2024-11-14 03:36:07,784 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:36:07,784 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-14 03:36:07,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:36:07,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-14 03:36:07,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1620, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 03:36:07,785 INFO L87 Difference]: Start difference. First operand 3001 states and 3910 transitions. Second operand has 21 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 11 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 10 states have call predecessors, (31), 10 states have call successors, (31) [2024-11-14 03:36:14,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:36:14,279 INFO L93 Difference]: Finished difference Result 3053 states and 3959 transitions. [2024-11-14 03:36:14,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-14 03:36:14,280 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 11 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 10 states have call predecessors, (31), 10 states have call successors, (31) Word has length 184 [2024-11-14 03:36:14,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:36:14,292 INFO L225 Difference]: With dead ends: 3053 [2024-11-14 03:36:14,292 INFO L226 Difference]: Without dead ends: 3051 [2024-11-14 03:36:14,294 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 655 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=244, Invalid=2306, Unknown=0, NotChecked=0, Total=2550 [2024-11-14 03:36:14,295 INFO L432 NwaCegarLoop]: 69 mSDtfsCounter, 71 mSDsluCounter, 708 mSDsCounter, 0 mSdLazyCounter, 991 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 1032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 991 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2024-11-14 03:36:14,295 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 777 Invalid, 1032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 991 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2024-11-14 03:36:14,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3051 states. [2024-11-14 03:36:17,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3051 to 3014. [2024-11-14 03:36:17,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3014 states, 1889 states have (on average 1.1725780836421387) internal successors, (2215), 1904 states have internal predecessors, (2215), 852 states have call successors, (852), 272 states have call predecessors, (852), 272 states have return successors, (846), 837 states have call predecessors, (846), 846 states have call successors, (846) [2024-11-14 03:36:17,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3014 states to 3014 states and 3913 transitions. [2024-11-14 03:36:17,159 INFO L78 Accepts]: Start accepts. Automaton has 3014 states and 3913 transitions. Word has length 184 [2024-11-14 03:36:17,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:36:17,160 INFO L471 AbstractCegarLoop]: Abstraction has 3014 states and 3913 transitions. [2024-11-14 03:36:17,160 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 18 states have internal predecessors, (44), 11 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 10 states have call predecessors, (31), 10 states have call successors, (31) [2024-11-14 03:36:17,161 INFO L276 IsEmpty]: Start isEmpty. Operand 3014 states and 3913 transitions. [2024-11-14 03:36:17,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2024-11-14 03:36:17,165 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:36:17,165 INFO L215 NwaCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:36:17,192 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2024-11-14 03:36:17,365 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:36:17,366 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:36:17,366 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:36:17,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1551104099, now seen corresponding path program 11 times [2024-11-14 03:36:17,366 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:36:17,366 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603631692] [2024-11-14 03:36:17,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:36:17,366 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:36:17,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:36:17,416 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1285624638] [2024-11-14 03:36:17,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:36:17,416 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:36:17,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:36:17,422 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:36:17,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-14 03:36:17,657 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:36:17,657 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:36:17,661 INFO L255 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 83 conjuncts are in the unsatisfiable core [2024-11-14 03:36:17,666 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:36:33,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1621 backedges. 282 proven. 184 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2024-11-14 03:36:33,326 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:36:35,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:36:35,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603631692] [2024-11-14 03:36:35,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:36:35,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285624638] [2024-11-14 03:36:35,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285624638] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:36:35,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2110190686] [2024-11-14 03:36:35,822 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:36:35,822 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:36:35,822 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:36:35,822 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:36:35,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:36:46,286 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:36:46,291 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:36:46,292 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:36:52,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '129471#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:36:52,868 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:36:52,868 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:36:52,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2024-11-14 03:36:52,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810437449] [2024-11-14 03:36:52,869 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:36:52,869 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:36:52,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:36:52,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:36:52,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=1917, Unknown=2, NotChecked=0, Total=2162 [2024-11-14 03:36:52,870 INFO L87 Difference]: Start difference. First operand 3014 states and 3913 transitions. Second operand has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (24), 10 states have call predecessors, (24), 9 states have call successors, (24) [2024-11-14 03:37:03,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:37:03,991 INFO L93 Difference]: Finished difference Result 3207 states and 4135 transitions. [2024-11-14 03:37:03,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 03:37:03,992 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (24), 10 states have call predecessors, (24), 9 states have call successors, (24) Word has length 184 [2024-11-14 03:37:03,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:37:04,006 INFO L225 Difference]: With dead ends: 3207 [2024-11-14 03:37:04,006 INFO L226 Difference]: Without dead ends: 3203 [2024-11-14 03:37:04,008 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=321, Invalid=2538, Unknown=3, NotChecked=0, Total=2862 [2024-11-14 03:37:04,009 INFO L432 NwaCegarLoop]: 72 mSDtfsCounter, 59 mSDsluCounter, 592 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2024-11-14 03:37:04,009 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 664 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 841 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2024-11-14 03:37:04,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3203 states. [2024-11-14 03:37:06,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3203 to 3167. [2024-11-14 03:37:06,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3167 states, 1993 states have (on average 1.168590065228299) internal successors, (2329), 2007 states have internal predecessors, (2329), 884 states have call successors, (884), 290 states have call predecessors, (884), 289 states have return successors, (878), 869 states have call predecessors, (878), 878 states have call successors, (878) [2024-11-14 03:37:06,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3167 states to 3167 states and 4091 transitions. [2024-11-14 03:37:06,859 INFO L78 Accepts]: Start accepts. Automaton has 3167 states and 4091 transitions. Word has length 184 [2024-11-14 03:37:06,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:37:06,859 INFO L471 AbstractCegarLoop]: Abstraction has 3167 states and 4091 transitions. [2024-11-14 03:37:06,859 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 10 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (24), 10 states have call predecessors, (24), 9 states have call successors, (24) [2024-11-14 03:37:06,860 INFO L276 IsEmpty]: Start isEmpty. Operand 3167 states and 4091 transitions. [2024-11-14 03:37:06,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2024-11-14 03:37:06,864 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:37:06,864 INFO L215 NwaCegarLoop]: trace histogram [28, 27, 27, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:37:06,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-14 03:37:07,066 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:37:07,066 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:37:07,067 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:37:07,067 INFO L85 PathProgramCache]: Analyzing trace with hash 119949606, now seen corresponding path program 12 times [2024-11-14 03:37:07,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:37:07,067 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518277542] [2024-11-14 03:37:07,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:37:07,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:37:07,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:37:07,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [539211962] [2024-11-14 03:37:07,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:37:07,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:37:07,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:37:07,126 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:37:07,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-14 03:37:07,295 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:37:07,296 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:37:07,299 INFO L255 TraceCheckSpWp]: Trace formula consists of 408 conjuncts, 100 conjuncts are in the unsatisfiable core [2024-11-14 03:37:07,305 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:37:12,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1632 backedges. 259 proven. 290 refuted. 0 times theorem prover too weak. 1083 trivial. 0 not checked. [2024-11-14 03:37:12,980 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:37:16,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:37:16,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518277542] [2024-11-14 03:37:16,617 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:37:16,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539211962] [2024-11-14 03:37:16,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [539211962] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:37:16,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1043397958] [2024-11-14 03:37:16,618 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2024-11-14 03:37:16,618 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:37:16,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:37:16,619 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:37:16,619 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:37:25,549 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs [2024-11-14 03:37:25,553 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:37:25,555 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:37:30,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '140201#(and (= |__VERIFIER_assert_#in~cond| 0) (<= ~counter~0 20))' at error location [2024-11-14 03:37:30,412 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:37:30,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2024-11-14 03:37:30,412 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2024-11-14 03:37:30,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852549137] [2024-11-14 03:37:30,413 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2024-11-14 03:37:30,413 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 03:37:30,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:37:30,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 03:37:30,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=2455, Unknown=0, NotChecked=0, Total=2756 [2024-11-14 03:37:30,415 INFO L87 Difference]: Start difference. First operand 3167 states and 4091 transitions. Second operand has 26 states, 24 states have (on average 2.0) internal successors, (48), 20 states have internal predecessors, (48), 13 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 13 states have call predecessors, (31), 12 states have call successors, (31) [2024-11-14 03:37:37,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:37:37,823 INFO L93 Difference]: Finished difference Result 3200 states and 4119 transitions. [2024-11-14 03:37:37,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 03:37:37,823 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 2.0) internal successors, (48), 20 states have internal predecessors, (48), 13 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 13 states have call predecessors, (31), 12 states have call successors, (31) Word has length 188 [2024-11-14 03:37:37,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:37:37,837 INFO L225 Difference]: With dead ends: 3200 [2024-11-14 03:37:37,838 INFO L226 Difference]: Without dead ends: 3198 [2024-11-14 03:37:37,839 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 415 GetRequests, 350 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1218 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=454, Invalid=3836, Unknown=0, NotChecked=0, Total=4290 [2024-11-14 03:37:37,840 INFO L432 NwaCegarLoop]: 70 mSDtfsCounter, 68 mSDsluCounter, 1041 mSDsCounter, 0 mSdLazyCounter, 1132 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 1111 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:37:37,841 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 1111 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1132 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2024-11-14 03:37:37,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3198 states. [2024-11-14 03:37:40,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3198 to 3187. [2024-11-14 03:37:40,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3187 states, 2008 states have (on average 1.1673306772908367) internal successors, (2344), 2022 states have internal predecessors, (2344), 884 states have call successors, (884), 295 states have call predecessors, (884), 294 states have return successors, (878), 869 states have call predecessors, (878), 878 states have call successors, (878) [2024-11-14 03:37:40,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3187 states to 3187 states and 4106 transitions. [2024-11-14 03:37:40,728 INFO L78 Accepts]: Start accepts. Automaton has 3187 states and 4106 transitions. Word has length 188 [2024-11-14 03:37:40,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:37:40,729 INFO L471 AbstractCegarLoop]: Abstraction has 3187 states and 4106 transitions. [2024-11-14 03:37:40,729 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 2.0) internal successors, (48), 20 states have internal predecessors, (48), 13 states have call successors, (32), 2 states have call predecessors, (32), 3 states have return successors, (31), 13 states have call predecessors, (31), 12 states have call successors, (31) [2024-11-14 03:37:40,729 INFO L276 IsEmpty]: Start isEmpty. Operand 3187 states and 4106 transitions. [2024-11-14 03:37:40,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2024-11-14 03:37:40,733 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:37:40,734 INFO L215 NwaCegarLoop]: trace histogram [29, 28, 28, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:37:40,759 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-14 03:37:40,938 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:37:40,938 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:37:40,938 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:37:40,938 INFO L85 PathProgramCache]: Analyzing trace with hash 64693272, now seen corresponding path program 4 times [2024-11-14 03:37:40,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:37:40,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396339492] [2024-11-14 03:37:40,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:37:40,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:37:40,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-14 03:37:40,975 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [514004005] [2024-11-14 03:37:40,975 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:37:40,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:37:40,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:37:40,978 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:37:40,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8d3ed777-996b-4c52-b175-31d64d571615/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-14 03:37:41,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:37:41,177 INFO L255 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 70 conjuncts are in the unsatisfiable core [2024-11-14 03:37:41,182 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:37:43,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1737 backedges. 133 proven. 164 refuted. 0 times theorem prover too weak. 1440 trivial. 0 not checked. [2024-11-14 03:37:43,415 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:37:51,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1737 backedges. 133 proven. 161 refuted. 0 times theorem prover too weak. 1443 trivial. 0 not checked. [2024-11-14 03:37:51,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:37:51,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396339492] [2024-11-14 03:37:51,010 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-14 03:37:51,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514004005] [2024-11-14 03:37:51,010 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514004005] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:37:51,010 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1490546108] [2024-11-14 03:37:51,012 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-14 03:37:51,012 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:37:51,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:37:51,012 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:37:51,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:38:00,068 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2024-11-14 03:38:00,072 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 7 for LOIs [2024-11-14 03:38:00,073 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:38:03,604 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '151467#(= |__VERIFIER_assert_#in~cond| 0)' at error location [2024-11-14 03:38:03,604 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:38:03,604 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-14 03:38:03,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 36 [2024-11-14 03:38:03,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085218411] [2024-11-14 03:38:03,604 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-14 03:38:03,605 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-14 03:38:03,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:38:03,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-14 03:38:03,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2024-11-14 03:38:03,610 INFO L87 Difference]: Start difference. First operand 3187 states and 4106 transitions. Second operand has 36 states, 33 states have (on average 2.484848484848485) internal successors, (82), 32 states have internal predecessors, (82), 22 states have call successors, (65), 3 states have call predecessors, (65), 3 states have return successors, (64), 20 states have call predecessors, (64), 20 states have call successors, (64) [2024-11-14 03:38:58,563 WARN L286 SmtUtils]: Spent 5.58s on a formula simplification. DAG size of input: 93 DAG size of output: 95 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-11-14 03:39:45,352 WARN L286 SmtUtils]: Spent 5.39s on a formula simplification. DAG size of input: 98 DAG size of output: 102 (called from [L 388] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)