./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m3.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_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/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_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/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_595956c8-c113-402c-a3f6-51f09c8fad93/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 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 --- Real Ultimate output --- This is Ultimate 0.3.0-dev-826ab2b [2024-11-14 03:18:57,106 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-14 03:18:57,180 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-14 03:18:57,191 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-14 03:18:57,191 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-14 03:18:57,218 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-14 03:18:57,219 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-14 03:18:57,219 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-14 03:18:57,219 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-14 03:18:57,220 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-14 03:18:57,220 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-14 03:18:57,221 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-14 03:18:57,221 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-14 03:18:57,221 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-14 03:18:57,221 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-14 03:18:57,221 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-14 03:18:57,222 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-14 03:18:57,222 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-14 03:18:57,222 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-14 03:18:57,222 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-14 03:18:57,222 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-14 03:18:57,223 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-14 03:18:57,224 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-14 03:18:57,224 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-14 03:18:57,224 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-14 03:18:57,224 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-14 03:18:57,224 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-14 03:18:57,225 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-14 03:18:57,225 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 03:18:57,225 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-14 03:18:57,225 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-14 03:18:57,225 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-14 03:18:57,226 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-14 03:18:57,226 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-14 03:18:57,226 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-14 03:18:57,226 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-14 03:18:57,226 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-14 03:18:57,226 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_595956c8-c113-402c-a3f6-51f09c8fad93/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 -> 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 [2024-11-14 03:18:57,594 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-14 03:18:57,604 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-14 03:18:57,607 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-14 03:18:57,608 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-14 03:18:57,609 INFO L274 PluginConnector]: CDTParser initialized [2024-11-14 03:18:57,610 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/../../sv-benchmarks/c/array-crafted/zero_sum_m3.c Unable to find full path for "g++" [2024-11-14 03:18:59,821 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-14 03:19:00,124 INFO L384 CDTParser]: Found 1 translation units. [2024-11-14 03:19:00,125 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/sv-benchmarks/c/array-crafted/zero_sum_m3.c [2024-11-14 03:19:00,136 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/data/e814137fc/620c1ab1e4d9486997ee73a15beba7ea/FLAG68b5bb8af [2024-11-14 03:19:00,396 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/data/e814137fc/620c1ab1e4d9486997ee73a15beba7ea [2024-11-14 03:19:00,399 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-14 03:19:00,402 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-14 03:19:00,408 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-14 03:19:00,409 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-14 03:19:00,414 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-14 03:19:00,416 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,419 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d94a7ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00, skipping insertion in model container [2024-11-14 03:19:00,419 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,436 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-14 03:19:00,628 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_595956c8-c113-402c-a3f6-51f09c8fad93/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2024-11-14 03:19:00,659 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 03:19:00,668 INFO L200 MainTranslator]: Completed pre-run [2024-11-14 03:19:00,678 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_595956c8-c113-402c-a3f6-51f09c8fad93/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2024-11-14 03:19:00,692 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-14 03:19:00,708 INFO L204 MainTranslator]: Completed translation [2024-11-14 03:19:00,708 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00 WrapperNode [2024-11-14 03:19:00,709 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-14 03:19:00,710 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-14 03:19:00,710 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-14 03:19:00,710 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-14 03:19:00,718 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,726 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,754 INFO L138 Inliner]: procedures = 15, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 101 [2024-11-14 03:19:00,754 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-14 03:19:00,758 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-14 03:19:00,758 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-14 03:19:00,758 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-14 03:19:00,768 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,769 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,771 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,773 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,779 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,784 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,785 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,786 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,788 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-14 03:19:00,789 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-14 03:19:00,789 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-14 03:19:00,790 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-14 03:19:00,791 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (1/1) ... [2024-11-14 03:19:00,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-14 03:19:00,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:00,831 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-14 03:19:00,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-14 03:19:00,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-14 03:19:00,871 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-14 03:19:00,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-14 03:19:00,872 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-14 03:19:00,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-14 03:19:00,872 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-14 03:19:00,872 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-14 03:19:00,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-14 03:19:00,963 INFO L238 CfgBuilder]: Building ICFG [2024-11-14 03:19:00,966 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-14 03:19:01,181 INFO L? ?]: Removed 13 outVars from TransFormulas that were not future-live. [2024-11-14 03:19:01,182 INFO L287 CfgBuilder]: Performing block encoding [2024-11-14 03:19:01,235 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-14 03:19:01,235 INFO L316 CfgBuilder]: Removed 7 assume(true) statements. [2024-11-14 03:19:01,236 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 03:19:01 BoogieIcfgContainer [2024-11-14 03:19:01,236 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-14 03:19:01,240 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-14 03:19:01,240 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-14 03:19:01,248 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-14 03:19:01,249 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.11 03:19:00" (1/3) ... [2024-11-14 03:19:01,249 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f9a217 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 03:19:01, skipping insertion in model container [2024-11-14 03:19:01,250 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.11 03:19:00" (2/3) ... [2024-11-14 03:19:01,250 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f9a217 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.11 03:19:01, skipping insertion in model container [2024-11-14 03:19:01,250 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.11 03:19:01" (3/3) ... [2024-11-14 03:19:01,252 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2024-11-14 03:19:01,270 INFO L217 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-14 03:19:01,272 INFO L154 ceAbstractionStarter]: Applying trace abstraction to ICFG zero_sum_m3.c that has 1 procedures, 15 locations, 1 initial locations, 7 loop locations, and 1 error locations. [2024-11-14 03:19:01,342 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-14 03:19:01,361 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;@5c7458b3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-14 03:19:01,361 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-14 03:19:01,368 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:01,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2024-11-14 03:19:01,377 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:01,378 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:01,378 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:01,384 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:01,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1383410613, now seen corresponding path program 1 times [2024-11-14 03:19:01,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:01,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1730994999] [2024-11-14 03:19:01,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:01,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:01,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:01,656 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:01,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:01,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1730994999] [2024-11-14 03:19:01,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1730994999] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:19:01,658 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:19:01,659 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-14 03:19:01,661 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275878909] [2024-11-14 03:19:01,661 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:19:01,666 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-14 03:19:01,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:01,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-14 03:19:01,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 03:19:01,691 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:01,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:01,793 INFO L93 Difference]: Finished difference Result 28 states and 43 transitions. [2024-11-14 03:19:01,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-14 03:19:01,798 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2024-11-14 03:19:01,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:01,806 INFO L225 Difference]: With dead ends: 28 [2024-11-14 03:19:01,806 INFO L226 Difference]: Without dead ends: 13 [2024-11-14 03:19:01,812 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-14 03:19:01,818 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:01,819 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:01,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2024-11-14 03:19:01,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2024-11-14 03:19:01,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:01,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 19 transitions. [2024-11-14 03:19:01,851 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 19 transitions. Word has length 11 [2024-11-14 03:19:01,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:01,852 INFO L471 AbstractCegarLoop]: Abstraction has 13 states and 19 transitions. [2024-11-14 03:19:01,852 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:01,852 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 19 transitions. [2024-11-14 03:19:01,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2024-11-14 03:19:01,852 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:01,854 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:01,855 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-14 03:19:01,855 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:01,856 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:01,856 INFO L85 PathProgramCache]: Analyzing trace with hash 847244860, now seen corresponding path program 1 times [2024-11-14 03:19:01,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:01,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096897048] [2024-11-14 03:19:01,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:01,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:01,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:01,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-14 03:19:01,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:01,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096897048] [2024-11-14 03:19:01,993 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096897048] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-14 03:19:01,993 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-14 03:19:01,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-14 03:19:01,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604907807] [2024-11-14 03:19:01,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-14 03:19:01,995 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-14 03:19:01,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:01,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-14 03:19:01,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-14 03:19:01,997 INFO L87 Difference]: Start difference. First operand 13 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:02,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:02,072 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2024-11-14 03:19:02,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 03:19:02,072 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2024-11-14 03:19:02,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:02,073 INFO L225 Difference]: With dead ends: 27 [2024-11-14 03:19:02,073 INFO L226 Difference]: Without dead ends: 19 [2024-11-14 03:19:02,073 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-14 03:19:02,074 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:02,075 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 5 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:02,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2024-11-14 03:19:02,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2024-11-14 03:19:02,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:02,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2024-11-14 03:19:02,082 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2024-11-14 03:19:02,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:02,082 INFO L471 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2024-11-14 03:19:02,083 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:02,083 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2024-11-14 03:19:02,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-14 03:19:02,083 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:02,084 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:02,084 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-14 03:19:02,084 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:02,085 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:02,085 INFO L85 PathProgramCache]: Analyzing trace with hash 881020952, now seen corresponding path program 1 times [2024-11-14 03:19:02,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:02,085 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357401600] [2024-11-14 03:19:02,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:02,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:02,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:02,363 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 03:19:02,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:02,364 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357401600] [2024-11-14 03:19:02,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357401600] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:02,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1923957935] [2024-11-14 03:19:02,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:02,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:02,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:02,371 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:02,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-14 03:19:02,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:02,487 INFO L255 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 03:19:02,491 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:02,574 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 03:19:02,574 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:02,606 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 03:19:02,606 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1923957935] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:02,607 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133310977] [2024-11-14 03:19:02,626 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:02,626 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:02,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:02,634 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:02,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:03,379 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:03,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '169#true' at error location [2024-11-14 03:19:03,517 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:03,517 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:03,517 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2024-11-14 03:19:03,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543126550] [2024-11-14 03:19:03,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:03,519 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-14 03:19:03,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:03,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-14 03:19:03,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2024-11-14 03:19:03,522 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:03,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:03,606 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2024-11-14 03:19:03,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-14 03:19:03,607 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-11-14 03:19:03,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:03,608 INFO L225 Difference]: With dead ends: 35 [2024-11-14 03:19:03,608 INFO L226 Difference]: Without dead ends: 20 [2024-11-14 03:19:03,608 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2024-11-14 03:19:03,609 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:03,609 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:03,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-14 03:19:03,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2024-11-14 03:19:03,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:03,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2024-11-14 03:19:03,614 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 18 [2024-11-14 03:19:03,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:03,615 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2024-11-14 03:19:03,615 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:03,615 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2024-11-14 03:19:03,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-14 03:19:03,616 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:03,616 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:03,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-14 03:19:03,816 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:03,817 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:03,817 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:03,817 INFO L85 PathProgramCache]: Analyzing trace with hash -2131167311, now seen corresponding path program 2 times [2024-11-14 03:19:03,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:03,817 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662815395] [2024-11-14 03:19:03,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:03,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:03,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-11-14 03:19:03,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:03,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662815395] [2024-11-14 03:19:03,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662815395] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:03,988 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668404486] [2024-11-14 03:19:03,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:19:03,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:03,990 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:03,992 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:03,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-14 03:19:04,080 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-14 03:19:04,081 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:04,082 INFO L255 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-14 03:19:04,084 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:04,129 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-11-14 03:19:04,129 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:04,161 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2024-11-14 03:19:04,161 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668404486] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:04,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [771987410] [2024-11-14 03:19:04,166 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:04,166 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:04,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:04,166 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:04,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:04,609 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:04,754 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '495#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:19:04,754 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:04,754 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:04,754 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2024-11-14 03:19:04,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [199914110] [2024-11-14 03:19:04,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:04,755 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-14 03:19:04,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:04,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-14 03:19:04,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2024-11-14 03:19:04,757 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:04,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:04,866 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2024-11-14 03:19:04,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-14 03:19:04,866 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2024-11-14 03:19:04,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:04,867 INFO L225 Difference]: With dead ends: 39 [2024-11-14 03:19:04,867 INFO L226 Difference]: Without dead ends: 26 [2024-11-14 03:19:04,867 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2024-11-14 03:19:04,868 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 25 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:04,868 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 13 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:04,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-14 03:19:04,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2024-11-14 03:19:04,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:04,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2024-11-14 03:19:04,874 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2024-11-14 03:19:04,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:04,874 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2024-11-14 03:19:04,874 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:04,874 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2024-11-14 03:19:04,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-14 03:19:04,875 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:04,875 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:04,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-14 03:19:05,075 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:05,076 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:05,076 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:05,076 INFO L85 PathProgramCache]: Analyzing trace with hash -551162795, now seen corresponding path program 3 times [2024-11-14 03:19:05,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:05,076 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670844145] [2024-11-14 03:19:05,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:05,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:05,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:07,603 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:07,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:07,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670844145] [2024-11-14 03:19:07,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670844145] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:07,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189901140] [2024-11-14 03:19:07,604 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:19:07,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:07,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:07,609 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:07,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-14 03:19:07,711 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:19:07,711 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:07,713 INFO L255 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 60 conjuncts are in the unsatisfiable core [2024-11-14 03:19:07,716 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:07,778 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:19:07,994 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:07,994 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:08,947 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-14 03:19:08,948 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189901140] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:08,948 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1366091881] [2024-11-14 03:19:08,950 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:08,951 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:08,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:08,951 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:08,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:09,329 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:09,641 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '617#true' at error location [2024-11-14 03:19:09,641 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:09,642 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:09,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 19] total 36 [2024-11-14 03:19:09,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830963805] [2024-11-14 03:19:09,642 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:09,642 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2024-11-14 03:19:09,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:09,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2024-11-14 03:19:09,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 03:19:09,644 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:10,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:10,349 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2024-11-14 03:19:10,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-14 03:19:10,349 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2024-11-14 03:19:10,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:10,350 INFO L225 Difference]: With dead ends: 45 [2024-11-14 03:19:10,350 INFO L226 Difference]: Without dead ends: 42 [2024-11-14 03:19:10,351 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 03:19:10,352 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 789 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 790 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:10,352 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 57 Invalid, 790 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 789 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-14 03:19:10,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-14 03:19:10,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2024-11-14 03:19:10,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:10,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2024-11-14 03:19:10,368 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 25 [2024-11-14 03:19:10,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:10,368 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2024-11-14 03:19:10,369 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3055555555555556) internal successors, (47), 36 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:10,369 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2024-11-14 03:19:10,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-14 03:19:10,369 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:10,369 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:10,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-14 03:19:10,572 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:10,573 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:10,573 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:10,573 INFO L85 PathProgramCache]: Analyzing trace with hash -1778851504, now seen corresponding path program 4 times [2024-11-14 03:19:10,573 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:10,573 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127473510] [2024-11-14 03:19:10,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:10,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:10,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:10,715 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 03:19:10,715 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:10,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127473510] [2024-11-14 03:19:10,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127473510] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:10,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199460299] [2024-11-14 03:19:10,715 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:19:10,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:10,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:10,718 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:10,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-14 03:19:10,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:10,797 INFO L255 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 03:19:10,799 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:10,869 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 03:19:10,869 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:10,919 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 03:19:10,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199460299] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:10,920 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625881439] [2024-11-14 03:19:10,923 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:10,924 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:10,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:10,924 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:10,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:11,224 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:11,357 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '958#true' at error location [2024-11-14 03:19:11,357 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:11,357 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:11,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2024-11-14 03:19:11,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330917873] [2024-11-14 03:19:11,358 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:11,358 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2024-11-14 03:19:11,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:11,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2024-11-14 03:19:11,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2024-11-14 03:19:11,359 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:11,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:11,514 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2024-11-14 03:19:11,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-14 03:19:11,515 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2024-11-14 03:19:11,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:11,516 INFO L225 Difference]: With dead ends: 78 [2024-11-14 03:19:11,516 INFO L226 Difference]: Without dead ends: 41 [2024-11-14 03:19:11,517 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2024-11-14 03:19:11,517 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:11,517 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:11,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2024-11-14 03:19:11,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2024-11-14 03:19:11,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:11,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 52 transitions. [2024-11-14 03:19:11,529 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 52 transitions. Word has length 26 [2024-11-14 03:19:11,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:11,530 INFO L471 AbstractCegarLoop]: Abstraction has 41 states and 52 transitions. [2024-11-14 03:19:11,530 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:11,530 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 52 transitions. [2024-11-14 03:19:11,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2024-11-14 03:19:11,531 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:11,531 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:11,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-14 03:19:11,732 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:11,732 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:11,732 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:11,732 INFO L85 PathProgramCache]: Analyzing trace with hash -557981719, now seen corresponding path program 5 times [2024-11-14 03:19:11,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:11,733 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532818942] [2024-11-14 03:19:11,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:11,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:11,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:11,884 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-14 03:19:11,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:11,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532818942] [2024-11-14 03:19:11,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532818942] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:11,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441038918] [2024-11-14 03:19:11,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:19:11,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:11,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:11,887 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:11,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-14 03:19:11,974 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 03:19:11,974 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:11,975 INFO L255 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-14 03:19:11,977 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:12,060 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-14 03:19:12,060 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:12,153 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-11-14 03:19:12,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441038918] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:12,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752796721] [2024-11-14 03:19:12,156 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:12,156 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:12,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:12,156 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:12,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:12,473 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:12,608 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1350#true' at error location [2024-11-14 03:19:12,608 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:12,608 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:12,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-14 03:19:12,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814225732] [2024-11-14 03:19:12,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:12,609 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-14 03:19:12,609 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:12,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-14 03:19:12,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2024-11-14 03:19:12,611 INFO L87 Difference]: Start difference. First operand 41 states and 52 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:12,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:12,765 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2024-11-14 03:19:12,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 03:19:12,765 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2024-11-14 03:19:12,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:12,766 INFO L225 Difference]: With dead ends: 62 [2024-11-14 03:19:12,766 INFO L226 Difference]: Without dead ends: 33 [2024-11-14 03:19:12,766 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2024-11-14 03:19:12,767 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:12,767 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 13 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:12,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2024-11-14 03:19:12,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2024-11-14 03:19:12,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:12,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2024-11-14 03:19:12,773 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 27 [2024-11-14 03:19:12,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:12,774 INFO L471 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2024-11-14 03:19:12,774 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 14 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:12,774 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2024-11-14 03:19:12,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-14 03:19:12,775 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:12,775 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:12,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-14 03:19:12,975 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:12,976 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:12,976 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:12,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1054044024, now seen corresponding path program 6 times [2024-11-14 03:19:12,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:12,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191588093] [2024-11-14 03:19:12,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:12,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:13,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:16,201 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:16,201 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:16,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191588093] [2024-11-14 03:19:16,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191588093] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:16,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937663814] [2024-11-14 03:19:16,201 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:19:16,202 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:16,202 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:16,203 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:16,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-14 03:19:16,288 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:19:16,288 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:16,296 INFO L255 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 86 conjuncts are in the unsatisfiable core [2024-11-14 03:19:16,301 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:16,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:19:17,381 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:17,381 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:19,024 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-14 03:19:19,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937663814] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:19,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [900384841] [2024-11-14 03:19:19,027 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:19,027 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:19,027 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:19,027 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:19,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:19,251 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:19,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1957#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:19:19,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:19,649 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:19,649 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 27, 25] total 68 [2024-11-14 03:19:19,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310523524] [2024-11-14 03:19:19,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:19,650 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2024-11-14 03:19:19,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:19,651 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2024-11-14 03:19:19,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=293, Invalid=4963, Unknown=0, NotChecked=0, Total=5256 [2024-11-14 03:19:19,654 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 68 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:23,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:23,228 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2024-11-14 03:19:23,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2024-11-14 03:19:23,229 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2024-11-14 03:19:23,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:23,231 INFO L225 Difference]: With dead ends: 85 [2024-11-14 03:19:23,232 INFO L226 Difference]: Without dead ends: 82 [2024-11-14 03:19:23,236 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2069 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=558, Invalid=8562, Unknown=0, NotChecked=0, Total=9120 [2024-11-14 03:19:23,237 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 2088 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 2160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 2088 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:23,237 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 101 Invalid, 2160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 2088 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2024-11-14 03:19:23,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2024-11-14 03:19:23,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 52. [2024-11-14 03:19:23,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.2549019607843137) internal successors, (64), 51 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:23,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 64 transitions. [2024-11-14 03:19:23,269 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 64 transitions. Word has length 32 [2024-11-14 03:19:23,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:23,270 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 64 transitions. [2024-11-14 03:19:23,270 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:23,270 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 64 transitions. [2024-11-14 03:19:23,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-14 03:19:23,270 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:23,270 INFO L215 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:23,287 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-14 03:19:23,472 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:23,472 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:23,472 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:23,473 INFO L85 PathProgramCache]: Analyzing trace with hash -1766629235, now seen corresponding path program 7 times [2024-11-14 03:19:23,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:23,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768748722] [2024-11-14 03:19:23,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:23,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:23,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:23,622 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-14 03:19:23,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:23,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768748722] [2024-11-14 03:19:23,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768748722] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:23,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880286467] [2024-11-14 03:19:23,623 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:19:23,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:23,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:23,625 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:23,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-14 03:19:23,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:23,703 INFO L255 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-14 03:19:23,705 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-14 03:19:23,796 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:23,868 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2024-11-14 03:19:23,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880286467] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:23,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1062775537] [2024-11-14 03:19:23,870 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:23,870 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:23,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:23,870 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:23,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:24,094 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:24,217 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2269#true' at error location [2024-11-14 03:19:24,217 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:24,217 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:24,217 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-14 03:19:24,218 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259526235] [2024-11-14 03:19:24,218 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:24,218 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-14 03:19:24,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:24,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-14 03:19:24,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-14 03:19:24,221 INFO L87 Difference]: Start difference. First operand 52 states and 64 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:24,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:24,413 INFO L93 Difference]: Finished difference Result 119 states and 147 transitions. [2024-11-14 03:19:24,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2024-11-14 03:19:24,414 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2024-11-14 03:19:24,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:24,414 INFO L225 Difference]: With dead ends: 119 [2024-11-14 03:19:24,416 INFO L226 Difference]: Without dead ends: 53 [2024-11-14 03:19:24,417 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 82 SyntacticMatches, 7 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2024-11-14 03:19:24,417 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:24,418 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:19:24,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2024-11-14 03:19:24,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2024-11-14 03:19:24,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:24,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 65 transitions. [2024-11-14 03:19:24,442 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 65 transitions. Word has length 33 [2024-11-14 03:19:24,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:24,443 INFO L471 AbstractCegarLoop]: Abstraction has 53 states and 65 transitions. [2024-11-14 03:19:24,443 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:24,443 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 65 transitions. [2024-11-14 03:19:24,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-14 03:19:24,447 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:24,448 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:24,476 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-14 03:19:24,648 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:24,648 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:24,649 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:24,649 INFO L85 PathProgramCache]: Analyzing trace with hash 696808404, now seen corresponding path program 8 times [2024-11-14 03:19:24,649 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:24,649 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685047667] [2024-11-14 03:19:24,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:24,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:24,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:24,811 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2024-11-14 03:19:24,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:24,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685047667] [2024-11-14 03:19:24,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685047667] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:24,811 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470959082] [2024-11-14 03:19:24,811 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:19:24,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:24,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:24,813 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:24,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-14 03:19:24,899 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-14 03:19:24,900 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:24,901 INFO L255 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-14 03:19:24,903 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:25,000 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2024-11-14 03:19:25,000 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:25,096 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2024-11-14 03:19:25,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470959082] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:25,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [314522768] [2024-11-14 03:19:25,098 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:25,098 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:25,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:25,099 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:25,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:25,327 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:25,441 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3028#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:19:25,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:25,441 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:25,441 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-14 03:19:25,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604237496] [2024-11-14 03:19:25,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:25,442 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-14 03:19:25,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:25,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-14 03:19:25,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2024-11-14 03:19:25,446 INFO L87 Difference]: Start difference. First operand 53 states and 65 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:25,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:25,597 INFO L93 Difference]: Finished difference Result 82 states and 104 transitions. [2024-11-14 03:19:25,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 03:19:25,599 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2024-11-14 03:19:25,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:25,599 INFO L225 Difference]: With dead ends: 82 [2024-11-14 03:19:25,599 INFO L226 Difference]: Without dead ends: 45 [2024-11-14 03:19:25,600 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 83 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2024-11-14 03:19:25,600 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:25,602 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 17 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:25,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2024-11-14 03:19:25,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2024-11-14 03:19:25,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:25,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2024-11-14 03:19:25,618 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 34 [2024-11-14 03:19:25,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:25,618 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2024-11-14 03:19:25,618 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 17 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:25,618 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2024-11-14 03:19:25,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-11-14 03:19:25,620 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:25,620 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:25,640 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2024-11-14 03:19:25,825 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-14 03:19:25,825 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:25,826 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:25,826 INFO L85 PathProgramCache]: Analyzing trace with hash 38049013, now seen corresponding path program 9 times [2024-11-14 03:19:25,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:25,826 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282954158] [2024-11-14 03:19:25,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:25,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:29,804 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:29,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:29,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282954158] [2024-11-14 03:19:29,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282954158] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:29,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529403313] [2024-11-14 03:19:29,805 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:19:29,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:29,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:29,806 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:29,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-14 03:19:29,910 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:19:29,910 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:29,913 WARN L253 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 114 conjuncts are in the unsatisfiable core [2024-11-14 03:19:29,917 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:29,946 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:19:31,481 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:31,481 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:34,261 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-14 03:19:34,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529403313] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:34,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2126079122] [2024-11-14 03:19:34,265 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:34,265 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:34,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:34,265 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:34,265 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:34,470 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:34,906 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3266#true' at error location [2024-11-14 03:19:34,906 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:34,906 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:34,906 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 34, 31] total 87 [2024-11-14 03:19:34,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862829403] [2024-11-14 03:19:34,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:34,907 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2024-11-14 03:19:34,907 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:34,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2024-11-14 03:19:34,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=7870, Unknown=0, NotChecked=0, Total=8190 [2024-11-14 03:19:34,910 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 87 states, 87 states have (on average 1.1724137931034482) internal successors, (102), 87 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:39,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:39,988 INFO L93 Difference]: Finished difference Result 97 states and 117 transitions. [2024-11-14 03:19:39,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2024-11-14 03:19:39,989 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.1724137931034482) internal successors, (102), 87 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2024-11-14 03:19:39,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:39,990 INFO L225 Difference]: With dead ends: 97 [2024-11-14 03:19:39,990 INFO L226 Difference]: Without dead ends: 94 [2024-11-14 03:19:39,992 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3328 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=723, Invalid=14039, Unknown=0, NotChecked=0, Total=14762 [2024-11-14 03:19:39,992 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 2957 mSolverCounterSat, 128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 3085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 128 IncrementalHoareTripleChecker+Valid, 2957 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:39,993 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 3085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [128 Valid, 2957 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2024-11-14 03:19:39,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2024-11-14 03:19:40,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 57. [2024-11-14 03:19:40,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:40,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2024-11-14 03:19:40,015 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 39 [2024-11-14 03:19:40,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:40,015 INFO L471 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2024-11-14 03:19:40,015 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.1724137931034482) internal successors, (102), 87 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:40,016 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2024-11-14 03:19:40,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-11-14 03:19:40,016 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:40,019 INFO L215 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:40,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2024-11-14 03:19:40,223 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-14 03:19:40,223 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:40,223 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:40,223 INFO L85 PathProgramCache]: Analyzing trace with hash -1502145752, now seen corresponding path program 10 times [2024-11-14 03:19:40,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:40,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806708784] [2024-11-14 03:19:40,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:40,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:40,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:40,403 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2024-11-14 03:19:40,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:40,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806708784] [2024-11-14 03:19:40,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1806708784] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:40,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198666039] [2024-11-14 03:19:40,404 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:19:40,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:40,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:40,406 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:40,407 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-14 03:19:40,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:40,497 INFO L255 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 03:19:40,499 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:40,627 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2024-11-14 03:19:40,627 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:40,725 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2024-11-14 03:19:40,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198666039] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:40,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365833202] [2024-11-14 03:19:40,727 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:40,727 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:40,727 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:40,727 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:40,727 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:40,938 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:41,077 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4196#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:19:41,078 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:41,078 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:41,078 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-14 03:19:41,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650278265] [2024-11-14 03:19:41,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:41,079 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:19:41,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:41,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:19:41,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2024-11-14 03:19:41,080 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:41,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:41,295 INFO L93 Difference]: Finished difference Result 134 states and 159 transitions. [2024-11-14 03:19:41,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2024-11-14 03:19:41,295 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2024-11-14 03:19:41,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:41,296 INFO L225 Difference]: With dead ends: 134 [2024-11-14 03:19:41,296 INFO L226 Difference]: Without dead ends: 58 [2024-11-14 03:19:41,296 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 99 SyntacticMatches, 9 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2024-11-14 03:19:41,297 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 246 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 246 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:41,297 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 246 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:19:41,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2024-11-14 03:19:41,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2024-11-14 03:19:41,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:41,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2024-11-14 03:19:41,320 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 40 [2024-11-14 03:19:41,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:41,320 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2024-11-14 03:19:41,321 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:41,321 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2024-11-14 03:19:41,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2024-11-14 03:19:41,321 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:41,321 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:41,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-14 03:19:41,522 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-14 03:19:41,522 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:41,522 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:41,522 INFO L85 PathProgramCache]: Analyzing trace with hash -1345711615, now seen corresponding path program 11 times [2024-11-14 03:19:41,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:41,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762857702] [2024-11-14 03:19:41,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:41,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:41,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:41,711 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 03:19:41,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:41,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762857702] [2024-11-14 03:19:41,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762857702] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:41,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87879069] [2024-11-14 03:19:41,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:19:41,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:41,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:41,714 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:41,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-14 03:19:41,823 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:19:41,824 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:41,825 INFO L255 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-14 03:19:41,829 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:41,929 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 03:19:41,929 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:42,049 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 03:19:42,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87879069] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:42,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560102326] [2024-11-14 03:19:42,051 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:42,051 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:42,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:42,052 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:42,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:42,247 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:42,370 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4572#true' at error location [2024-11-14 03:19:42,370 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:42,371 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:42,371 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-14 03:19:42,371 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49241242] [2024-11-14 03:19:42,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:42,371 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-14 03:19:42,371 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:42,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-14 03:19:42,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2024-11-14 03:19:42,372 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:42,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:19:42,531 INFO L93 Difference]: Finished difference Result 92 states and 112 transitions. [2024-11-14 03:19:42,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 03:19:42,531 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2024-11-14 03:19:42,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:19:42,532 INFO L225 Difference]: With dead ends: 92 [2024-11-14 03:19:42,532 INFO L226 Difference]: Without dead ends: 47 [2024-11-14 03:19:42,533 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 102 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2024-11-14 03:19:42,533 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:19:42,534 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 15 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-14 03:19:42,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-14 03:19:42,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2024-11-14 03:19:42,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:42,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2024-11-14 03:19:42,550 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 41 [2024-11-14 03:19:42,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:19:42,550 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2024-11-14 03:19:42,550 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:19:42,550 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2024-11-14 03:19:42,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-14 03:19:42,551 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:19:42,551 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:19:42,564 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2024-11-14 03:19:42,751 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:42,751 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:19:42,751 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:19:42,752 INFO L85 PathProgramCache]: Analyzing trace with hash -1439914280, now seen corresponding path program 12 times [2024-11-14 03:19:42,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:19:42,752 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711907898] [2024-11-14 03:19:42,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:19:42,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:19:42,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:19:47,906 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:47,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:19:47,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711907898] [2024-11-14 03:19:47,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711907898] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:19:47,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661821062] [2024-11-14 03:19:47,907 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:19:47,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:19:47,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:19:47,911 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:19:47,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-14 03:19:48,010 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:19:48,010 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:19:48,014 WARN L253 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 138 conjuncts are in the unsatisfiable core [2024-11-14 03:19:48,018 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:19:48,101 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:19:50,681 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:19:50,681 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:19:55,171 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-11-14 03:19:55,171 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661821062] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:19:55,171 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799603548] [2024-11-14 03:19:55,173 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:19:55,173 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:19:55,173 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:19:55,173 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:19:55,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:19:55,344 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:19:55,998 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5480#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:19:55,999 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:19:55,999 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:19:55,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 41, 37] total 107 [2024-11-14 03:19:55,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901974218] [2024-11-14 03:19:55,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:19:55,999 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2024-11-14 03:19:55,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:19:56,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2024-11-14 03:19:56,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=11965, Unknown=0, NotChecked=0, Total=12432 [2024-11-14 03:19:56,003 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:03,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:03,666 INFO L93 Difference]: Finished difference Result 114 states and 133 transitions. [2024-11-14 03:20:03,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2024-11-14 03:20:03,667 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2024-11-14 03:20:03,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:03,668 INFO L225 Difference]: With dead ends: 114 [2024-11-14 03:20:03,668 INFO L226 Difference]: Without dead ends: 111 [2024-11-14 03:20:03,672 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5408 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=1205, Invalid=22357, Unknown=0, NotChecked=0, Total=23562 [2024-11-14 03:20:03,672 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 3728 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 3951 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 3728 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:03,673 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 131 Invalid, 3951 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 3728 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2024-11-14 03:20:03,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2024-11-14 03:20:03,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 67. [2024-11-14 03:20:03,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 66 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:03,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2024-11-14 03:20:03,711 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 46 [2024-11-14 03:20:03,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:03,711 INFO L471 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2024-11-14 03:20:03,711 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:03,711 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2024-11-14 03:20:03,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2024-11-14 03:20:03,712 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:03,712 INFO L215 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:03,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-14 03:20:03,912 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:03,913 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:03,913 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:03,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1276760019, now seen corresponding path program 13 times [2024-11-14 03:20:03,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:03,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895597603] [2024-11-14 03:20:03,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:03,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:03,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:04,129 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2024-11-14 03:20:04,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:04,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895597603] [2024-11-14 03:20:04,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895597603] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:04,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608661814] [2024-11-14 03:20:04,129 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:20:04,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:04,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:04,131 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:04,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-14 03:20:04,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:04,235 INFO L255 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 03:20:04,237 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:04,375 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2024-11-14 03:20:04,375 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:04,486 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2024-11-14 03:20:04,486 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608661814] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:04,487 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [159056144] [2024-11-14 03:20:04,488 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:04,488 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:04,488 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:04,488 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:04,488 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:04,670 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:20:04,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5918#true' at error location [2024-11-14 03:20:04,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:20:04,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:20:04,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-14 03:20:04,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245316700] [2024-11-14 03:20:04,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:20:04,795 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-14 03:20:04,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:20:04,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-14 03:20:04,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2024-11-14 03:20:04,796 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:05,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:05,099 INFO L93 Difference]: Finished difference Result 158 states and 183 transitions. [2024-11-14 03:20:05,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-14 03:20:05,100 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2024-11-14 03:20:05,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:05,100 INFO L225 Difference]: With dead ends: 158 [2024-11-14 03:20:05,100 INFO L226 Difference]: Without dead ends: 68 [2024-11-14 03:20:05,101 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 118 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2024-11-14 03:20:05,101 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:05,102 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:20:05,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2024-11-14 03:20:05,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2024-11-14 03:20:05,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.164179104477612) internal successors, (78), 67 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:05,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2024-11-14 03:20:05,132 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 47 [2024-11-14 03:20:05,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:05,133 INFO L471 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2024-11-14 03:20:05,133 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:05,133 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2024-11-14 03:20:05,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-14 03:20:05,133 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:05,133 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:05,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2024-11-14 03:20:05,334 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:05,334 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:05,334 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:05,334 INFO L85 PathProgramCache]: Analyzing trace with hash 1656257332, now seen corresponding path program 14 times [2024-11-14 03:20:05,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:05,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177663275] [2024-11-14 03:20:05,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:05,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:05,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:05,573 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-14 03:20:05,573 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:05,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177663275] [2024-11-14 03:20:05,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177663275] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:05,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602426402] [2024-11-14 03:20:05,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:20:05,574 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:05,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:05,576 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:05,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-14 03:20:05,694 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-14 03:20:05,694 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:20:05,696 INFO L255 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-14 03:20:05,698 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:05,920 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-14 03:20:05,921 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:06,067 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-14 03:20:06,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602426402] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:06,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [620592244] [2024-11-14 03:20:06,068 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:06,068 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:06,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:06,070 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:06,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:06,220 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:20:06,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6970#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:20:06,341 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:20:06,341 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:20:06,341 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 28 [2024-11-14 03:20:06,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496300482] [2024-11-14 03:20:06,341 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:20:06,341 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2024-11-14 03:20:06,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:20:06,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2024-11-14 03:20:06,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:20:06,342 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:06,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:06,695 INFO L93 Difference]: Finished difference Result 107 states and 127 transitions. [2024-11-14 03:20:06,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-14 03:20:06,695 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2024-11-14 03:20:06,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:06,696 INFO L225 Difference]: With dead ends: 107 [2024-11-14 03:20:06,696 INFO L226 Difference]: Without dead ends: 54 [2024-11-14 03:20:06,697 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 120 SyntacticMatches, 12 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 742 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 03:20:06,697 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 618 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:06,697 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 25 Invalid, 618 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:20:06,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-14 03:20:06,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2024-11-14 03:20:06,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:06,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2024-11-14 03:20:06,724 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 48 [2024-11-14 03:20:06,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:06,724 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2024-11-14 03:20:06,724 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 28 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:06,724 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2024-11-14 03:20:06,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2024-11-14 03:20:06,725 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:06,725 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:06,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-14 03:20:06,925 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:06,926 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:06,926 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:06,926 INFO L85 PathProgramCache]: Analyzing trace with hash -887413355, now seen corresponding path program 15 times [2024-11-14 03:20:06,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:06,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392380643] [2024-11-14 03:20:06,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:06,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:07,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:14,113 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 2 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:20:14,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:14,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392380643] [2024-11-14 03:20:14,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392380643] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:14,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171628802] [2024-11-14 03:20:14,114 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:20:14,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:14,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:14,116 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:14,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-14 03:20:14,241 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:20:14,241 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:20:14,244 WARN L253 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 166 conjuncts are in the unsatisfiable core [2024-11-14 03:20:14,248 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:14,402 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:20:17,371 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:20:17,371 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:23,777 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2024-11-14 03:20:23,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171628802] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:23,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [208583839] [2024-11-14 03:20:23,779 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:23,779 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:23,779 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:23,779 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:23,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:23,956 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:20:24,698 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7304#true' at error location [2024-11-14 03:20:24,698 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:20:24,698 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:20:24,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 48, 43] total 123 [2024-11-14 03:20:24,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127751473] [2024-11-14 03:20:24,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:20:24,699 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2024-11-14 03:20:24,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:20:24,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2024-11-14 03:20:24,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=465, Invalid=15537, Unknown=0, NotChecked=0, Total=16002 [2024-11-14 03:20:24,701 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 123 states, 123 states have (on average 1.1219512195121952) internal successors, (138), 123 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:35,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:35,633 INFO L93 Difference]: Finished difference Result 131 states and 153 transitions. [2024-11-14 03:20:35,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2024-11-14 03:20:35,634 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.1219512195121952) internal successors, (138), 123 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2024-11-14 03:20:35,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:35,635 INFO L225 Difference]: With dead ends: 131 [2024-11-14 03:20:35,635 INFO L226 Difference]: Without dead ends: 128 [2024-11-14 03:20:35,638 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7426 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=1263, Invalid=29889, Unknown=0, NotChecked=0, Total=31152 [2024-11-14 03:20:35,638 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 5190 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 5351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 5190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:35,638 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 163 Invalid, 5351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 5190 Invalid, 0 Unknown, 0 Unchecked, 4.1s Time] [2024-11-14 03:20:35,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2024-11-14 03:20:35,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 77. [2024-11-14 03:20:35,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.144736842105263) internal successors, (87), 76 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:35,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2024-11-14 03:20:35,684 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 53 [2024-11-14 03:20:35,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:35,684 INFO L471 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2024-11-14 03:20:35,684 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.1219512195121952) internal successors, (138), 123 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:35,685 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2024-11-14 03:20:35,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-11-14 03:20:35,685 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:35,685 INFO L215 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:35,700 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2024-11-14 03:20:35,885 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-14 03:20:35,886 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:35,886 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:35,886 INFO L85 PathProgramCache]: Analyzing trace with hash -52844664, now seen corresponding path program 16 times [2024-11-14 03:20:35,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:35,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352897666] [2024-11-14 03:20:35,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:35,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:35,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:36,113 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 03:20:36,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:36,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352897666] [2024-11-14 03:20:36,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1352897666] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:36,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371175011] [2024-11-14 03:20:36,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:20:36,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:36,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:36,115 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:36,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-14 03:20:36,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:36,221 INFO L255 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 03:20:36,223 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:36,370 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 03:20:36,371 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:36,493 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 03:20:36,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371175011] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:36,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860541442] [2024-11-14 03:20:36,495 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:36,495 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:36,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:36,495 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:36,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:36,635 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:20:36,757 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8246#true' at error location [2024-11-14 03:20:36,757 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:20:36,757 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:20:36,757 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-14 03:20:36,758 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696638053] [2024-11-14 03:20:36,758 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:20:36,758 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-14 03:20:36,758 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:20:36,758 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-14 03:20:36,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2024-11-14 03:20:36,759 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:37,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:37,034 INFO L93 Difference]: Finished difference Result 182 states and 207 transitions. [2024-11-14 03:20:37,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-14 03:20:37,035 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2024-11-14 03:20:37,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:37,035 INFO L225 Difference]: With dead ends: 182 [2024-11-14 03:20:37,036 INFO L226 Difference]: Without dead ends: 78 [2024-11-14 03:20:37,036 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 136 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2024-11-14 03:20:37,036 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:37,037 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 15 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:20:37,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2024-11-14 03:20:37,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2024-11-14 03:20:37,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.1428571428571428) internal successors, (88), 77 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:37,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 88 transitions. [2024-11-14 03:20:37,086 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 88 transitions. Word has length 54 [2024-11-14 03:20:37,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:37,086 INFO L471 AbstractCegarLoop]: Abstraction has 78 states and 88 transitions. [2024-11-14 03:20:37,086 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:37,086 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 88 transitions. [2024-11-14 03:20:37,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2024-11-14 03:20:37,086 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:37,086 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:37,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-14 03:20:37,286 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-14 03:20:37,287 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:37,287 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:37,287 INFO L85 PathProgramCache]: Analyzing trace with hash 756364961, now seen corresponding path program 17 times [2024-11-14 03:20:37,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:37,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344890617] [2024-11-14 03:20:37,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:37,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:37,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:37,539 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-14 03:20:37,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:37,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344890617] [2024-11-14 03:20:37,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344890617] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:37,540 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359990929] [2024-11-14 03:20:37,540 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:20:37,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:37,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:37,542 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:37,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-14 03:20:37,677 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-14 03:20:37,677 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:20:37,679 INFO L255 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-14 03:20:37,680 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:37,903 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-14 03:20:37,903 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:38,131 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2024-11-14 03:20:38,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359990929] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:38,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [23599519] [2024-11-14 03:20:38,132 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:38,132 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:38,132 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:38,132 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:38,132 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:38,294 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:20:38,469 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9463#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:20:38,469 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:20:38,469 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:20:38,469 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 38 [2024-11-14 03:20:38,469 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043174468] [2024-11-14 03:20:38,469 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:20:38,469 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 03:20:38,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:20:38,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 03:20:38,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=1585, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 03:20:38,470 INFO L87 Difference]: Start difference. First operand 78 states and 88 transitions. Second operand has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:38,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:20:38,813 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2024-11-14 03:20:38,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-14 03:20:38,814 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2024-11-14 03:20:38,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:20:38,815 INFO L225 Difference]: With dead ends: 122 [2024-11-14 03:20:38,815 INFO L226 Difference]: Without dead ends: 61 [2024-11-14 03:20:38,815 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 132 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=311, Invalid=2139, Unknown=0, NotChecked=0, Total=2450 [2024-11-14 03:20:38,815 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 51 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:20:38,816 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 23 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:20:38,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2024-11-14 03:20:38,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2024-11-14 03:20:38,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:38,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2024-11-14 03:20:38,851 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 55 [2024-11-14 03:20:38,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:20:38,851 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2024-11-14 03:20:38,851 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:20:38,851 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2024-11-14 03:20:38,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-14 03:20:38,852 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:20:38,852 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:20:38,881 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-14 03:20:39,052 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:39,052 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:20:39,052 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:20:39,053 INFO L85 PathProgramCache]: Analyzing trace with hash -83560904, now seen corresponding path program 18 times [2024-11-14 03:20:39,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:20:39,053 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438488019] [2024-11-14 03:20:39,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:20:39,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:20:39,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:20:47,016 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 7 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:20:47,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:20:47,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438488019] [2024-11-14 03:20:47,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438488019] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:20:47,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356704088] [2024-11-14 03:20:47,016 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:20:47,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:20:47,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:20:47,018 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:20:47,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-14 03:20:47,141 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:20:47,141 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:20:47,144 WARN L253 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 190 conjuncts are in the unsatisfiable core [2024-11-14 03:20:47,147 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:20:47,368 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:20:50,129 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:20:50,129 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:20:59,042 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2024-11-14 03:20:59,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356704088] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:20:59,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2052685861] [2024-11-14 03:20:59,044 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:20:59,044 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:20:59,044 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:20:59,044 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:20:59,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:20:59,222 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:21:00,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9835#true' at error location [2024-11-14 03:21:00,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:21:00,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:21:00,033 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 55, 49] total 131 [2024-11-14 03:21:00,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073151760] [2024-11-14 03:21:00,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:21:00,033 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2024-11-14 03:21:00,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:21:00,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2024-11-14 03:21:00,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=17587, Unknown=0, NotChecked=0, Total=18090 [2024-11-14 03:21:00,035 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 131 states, 131 states have (on average 1.1068702290076335) internal successors, (145), 131 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:14,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:21:14,037 INFO L93 Difference]: Finished difference Result 146 states and 168 transitions. [2024-11-14 03:21:14,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2024-11-14 03:21:14,038 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 1.1068702290076335) internal successors, (145), 131 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2024-11-14 03:21:14,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:21:14,039 INFO L225 Difference]: With dead ends: 146 [2024-11-14 03:21:14,039 INFO L226 Difference]: Without dead ends: 143 [2024-11-14 03:21:14,039 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7904 ImplicationChecksByTransitivity, 23.2s TimeCoverageRelationStatistics Valid=1463, Invalid=34827, Unknown=0, NotChecked=0, Total=36290 [2024-11-14 03:21:14,040 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 6164 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 6366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 6164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2024-11-14 03:21:14,040 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 175 Invalid, 6366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 6164 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2024-11-14 03:21:14,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2024-11-14 03:21:14,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 87. [2024-11-14 03:21:14,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.127906976744186) internal successors, (97), 86 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:14,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 97 transitions. [2024-11-14 03:21:14,092 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 97 transitions. Word has length 60 [2024-11-14 03:21:14,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:21:14,092 INFO L471 AbstractCegarLoop]: Abstraction has 87 states and 97 transitions. [2024-11-14 03:21:14,092 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 1.1068702290076335) internal successors, (145), 131 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:14,092 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 97 transitions. [2024-11-14 03:21:14,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2024-11-14 03:21:14,092 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:21:14,093 INFO L215 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:21:14,106 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2024-11-14 03:21:14,293 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:21:14,293 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:21:14,293 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:21:14,294 INFO L85 PathProgramCache]: Analyzing trace with hash 911222733, now seen corresponding path program 19 times [2024-11-14 03:21:14,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:21:14,294 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30744060] [2024-11-14 03:21:14,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:21:14,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:21:14,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:21:14,649 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2024-11-14 03:21:14,650 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:21:14,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30744060] [2024-11-14 03:21:14,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30744060] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:21:14,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55042272] [2024-11-14 03:21:14,650 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:21:14,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:21:14,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:21:14,654 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:21:14,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-14 03:21:14,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:21:14,786 INFO L255 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-14 03:21:14,788 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:21:15,024 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2024-11-14 03:21:15,024 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:21:15,164 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2024-11-14 03:21:15,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55042272] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:21:15,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [48273333] [2024-11-14 03:21:15,166 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:21:15,166 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:21:15,166 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:21:15,166 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:21:15,166 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:21:15,311 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:21:15,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10889#true' at error location [2024-11-14 03:21:15,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:21:15,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:21:15,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-14 03:21:15,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143834699] [2024-11-14 03:21:15,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:21:15,444 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 03:21:15,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:21:15,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 03:21:15,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:21:15,445 INFO L87 Difference]: Start difference. First operand 87 states and 97 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:15,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:21:15,845 INFO L93 Difference]: Finished difference Result 206 states and 231 transitions. [2024-11-14 03:21:15,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2024-11-14 03:21:15,846 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2024-11-14 03:21:15,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:21:15,847 INFO L225 Difference]: With dead ends: 206 [2024-11-14 03:21:15,847 INFO L226 Difference]: Without dead ends: 88 [2024-11-14 03:21:15,847 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 154 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:21:15,848 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:21:15,848 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:21:15,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2024-11-14 03:21:15,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2024-11-14 03:21:15,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 87 states have (on average 1.1264367816091954) internal successors, (98), 87 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:15,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 98 transitions. [2024-11-14 03:21:15,916 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 98 transitions. Word has length 61 [2024-11-14 03:21:15,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:21:15,916 INFO L471 AbstractCegarLoop]: Abstraction has 88 states and 98 transitions. [2024-11-14 03:21:15,916 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:15,916 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 98 transitions. [2024-11-14 03:21:15,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-14 03:21:15,916 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:21:15,917 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:21:15,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2024-11-14 03:21:16,117 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2024-11-14 03:21:16,117 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:21:16,117 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:21:16,117 INFO L85 PathProgramCache]: Analyzing trace with hash 1254300308, now seen corresponding path program 20 times [2024-11-14 03:21:16,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:21:16,117 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [838294092] [2024-11-14 03:21:16,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:21:16,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:21:16,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:21:16,459 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2024-11-14 03:21:16,459 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:21:16,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [838294092] [2024-11-14 03:21:16,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [838294092] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:21:16,460 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867541384] [2024-11-14 03:21:16,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:21:16,460 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:21:16,460 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:21:16,463 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:21:16,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-14 03:21:16,713 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-14 03:21:16,713 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:21:16,715 INFO L255 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-14 03:21:16,717 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:21:16,897 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2024-11-14 03:21:16,897 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:21:17,078 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2024-11-14 03:21:17,078 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [867541384] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:21:17,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833788742] [2024-11-14 03:21:17,079 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:21:17,079 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:21:17,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:21:17,079 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:21:17,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:21:17,217 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:21:17,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11857#true' at error location [2024-11-14 03:21:17,331 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:21:17,332 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:21:17,332 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-14 03:21:17,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405718878] [2024-11-14 03:21:17,332 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:21:17,332 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-14 03:21:17,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:21:17,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-14 03:21:17,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=845, Unknown=0, NotChecked=0, Total=1056 [2024-11-14 03:21:17,333 INFO L87 Difference]: Start difference. First operand 88 states and 98 transitions. Second operand has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:17,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:21:17,603 INFO L93 Difference]: Finished difference Result 137 states and 157 transitions. [2024-11-14 03:21:17,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 03:21:17,603 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2024-11-14 03:21:17,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:21:17,604 INFO L225 Difference]: With dead ends: 137 [2024-11-14 03:21:17,604 INFO L226 Difference]: Without dead ends: 68 [2024-11-14 03:21:17,605 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 156 SyntacticMatches, 16 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=222, Invalid=900, Unknown=0, NotChecked=0, Total=1122 [2024-11-14 03:21:17,606 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 386 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:21:17,607 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 21 Invalid, 386 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:21:17,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2024-11-14 03:21:17,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2024-11-14 03:21:17,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:17,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2024-11-14 03:21:17,665 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 62 [2024-11-14 03:21:17,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:21:17,665 INFO L471 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2024-11-14 03:21:17,666 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.9655172413793103) internal successors, (57), 29 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:21:17,666 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2024-11-14 03:21:17,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2024-11-14 03:21:17,666 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:21:17,666 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:21:17,687 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2024-11-14 03:21:17,866 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2024-11-14 03:21:17,867 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:21:17,867 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:21:17,867 INFO L85 PathProgramCache]: Analyzing trace with hash -1619812811, now seen corresponding path program 21 times [2024-11-14 03:21:17,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:21:17,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610799894] [2024-11-14 03:21:17,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:21:17,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:21:18,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:21:28,108 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 22 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:21:28,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:21:28,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610799894] [2024-11-14 03:21:28,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610799894] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:21:28,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609073676] [2024-11-14 03:21:28,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:21:28,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:21:28,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:21:28,111 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:21:28,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-14 03:21:28,264 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:21:28,264 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:21:28,270 WARN L253 TraceCheckSpWp]: Trace formula consists of 376 conjuncts, 218 conjuncts are in the unsatisfiable core [2024-11-14 03:21:28,275 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:21:28,501 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:21:32,289 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:21:32,289 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:21:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-14 03:21:44,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609073676] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:21:44,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1159502050] [2024-11-14 03:21:44,643 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:21:44,643 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:21:44,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:21:44,643 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:21:44,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:21:44,779 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:21:45,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13198#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:21:45,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:21:45,861 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:21:45,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 62, 55] total 147 [2024-11-14 03:21:45,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333468542] [2024-11-14 03:21:45,862 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:21:45,862 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 147 states [2024-11-14 03:21:45,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:21:45,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 147 interpolants. [2024-11-14 03:21:45,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=700, Invalid=22252, Unknown=0, NotChecked=0, Total=22952 [2024-11-14 03:21:45,865 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 147 states, 147 states have (on average 1.1020408163265305) internal successors, (162), 147 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:03,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:22:03,843 INFO L93 Difference]: Finished difference Result 164 states and 183 transitions. [2024-11-14 03:22:03,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2024-11-14 03:22:03,844 INFO L78 Accepts]: Start accepts. Automaton has has 147 states, 147 states have (on average 1.1020408163265305) internal successors, (162), 147 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2024-11-14 03:22:03,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:22:03,845 INFO L225 Difference]: With dead ends: 164 [2024-11-14 03:22:03,846 INFO L226 Difference]: Without dead ends: 161 [2024-11-14 03:22:03,848 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9710 ImplicationChecksByTransitivity, 31.1s TimeCoverageRelationStatistics Valid=2075, Invalid=43081, Unknown=0, NotChecked=0, Total=45156 [2024-11-14 03:22:03,849 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 7040 mSolverCounterSat, 293 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 7333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 293 IncrementalHoareTripleChecker+Valid, 7040 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:22:03,849 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 177 Invalid, 7333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [293 Valid, 7040 Invalid, 0 Unknown, 0 Unchecked, 6.3s Time] [2024-11-14 03:22:03,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2024-11-14 03:22:03,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 97. [2024-11-14 03:22:03,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.1145833333333333) internal successors, (107), 96 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:03,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 107 transitions. [2024-11-14 03:22:03,935 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 107 transitions. Word has length 67 [2024-11-14 03:22:03,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:22:03,935 INFO L471 AbstractCegarLoop]: Abstraction has 97 states and 107 transitions. [2024-11-14 03:22:03,936 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 147 states, 147 states have (on average 1.1020408163265305) internal successors, (162), 147 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:03,936 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 107 transitions. [2024-11-14 03:22:03,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2024-11-14 03:22:03,936 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:22:03,936 INFO L215 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:22:03,950 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-14 03:22:04,137 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2024-11-14 03:22:04,137 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:22:04,137 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:22:04,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1635904536, now seen corresponding path program 22 times [2024-11-14 03:22:04,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:22:04,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604105994] [2024-11-14 03:22:04,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:22:04,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:22:04,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:22:04,427 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-14 03:22:04,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:22:04,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604105994] [2024-11-14 03:22:04,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604105994] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:22:04,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205457610] [2024-11-14 03:22:04,427 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:22:04,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:22:04,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:22:04,429 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:22:04,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-14 03:22:04,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:22:04,583 INFO L255 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 03:22:04,584 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:22:04,800 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-14 03:22:04,801 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:22:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-14 03:22:04,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205457610] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:22:04,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [466533974] [2024-11-14 03:22:04,989 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:22:04,989 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:22:04,989 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:22:04,989 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:22:04,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:22:05,124 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:22:05,263 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13834#true' at error location [2024-11-14 03:22:05,264 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:22:05,264 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:22:05,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-14 03:22:05,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941711845] [2024-11-14 03:22:05,264 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:22:05,264 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-14 03:22:05,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:22:05,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-14 03:22:05,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 03:22:05,265 INFO L87 Difference]: Start difference. First operand 97 states and 107 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:05,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:22:05,690 INFO L93 Difference]: Finished difference Result 230 states and 255 transitions. [2024-11-14 03:22:05,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-14 03:22:05,691 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2024-11-14 03:22:05,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:22:05,692 INFO L225 Difference]: With dead ends: 230 [2024-11-14 03:22:05,692 INFO L226 Difference]: Without dead ends: 98 [2024-11-14 03:22:05,692 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 172 SyntacticMatches, 17 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 03:22:05,692 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:22:05,693 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:22:05,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2024-11-14 03:22:05,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2024-11-14 03:22:05,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.1134020618556701) internal successors, (108), 97 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:05,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2024-11-14 03:22:05,763 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 68 [2024-11-14 03:22:05,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:22:05,763 INFO L471 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2024-11-14 03:22:05,764 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:05,764 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2024-11-14 03:22:05,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2024-11-14 03:22:05,764 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:22:05,764 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:22:05,780 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-14 03:22:05,965 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2024-11-14 03:22:05,965 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:22:05,965 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:22:05,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1572814015, now seen corresponding path program 23 times [2024-11-14 03:22:05,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:22:05,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142714217] [2024-11-14 03:22:05,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:22:05,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:22:05,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:22:06,291 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2024-11-14 03:22:06,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:22:06,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142714217] [2024-11-14 03:22:06,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142714217] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:22:06,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389217362] [2024-11-14 03:22:06,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:22:06,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:22:06,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:22:06,293 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:22:06,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-14 03:22:06,470 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 03:22:06,471 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:22:06,473 INFO L255 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-14 03:22:06,474 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:22:06,695 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2024-11-14 03:22:06,695 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:22:06,902 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2024-11-14 03:22:06,902 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389217362] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:22:06,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [47419636] [2024-11-14 03:22:06,904 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:22:06,904 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:22:06,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:22:06,904 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:22:06,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:22:07,043 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:22:07,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14915#true' at error location [2024-11-14 03:22:07,172 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:22:07,172 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:22:07,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-14 03:22:07,172 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472289732] [2024-11-14 03:22:07,172 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:22:07,173 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-14 03:22:07,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:22:07,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-14 03:22:07,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1007, Unknown=0, NotChecked=0, Total=1260 [2024-11-14 03:22:07,174 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:07,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:22:07,458 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2024-11-14 03:22:07,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-14 03:22:07,458 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2024-11-14 03:22:07,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:22:07,459 INFO L225 Difference]: With dead ends: 152 [2024-11-14 03:22:07,459 INFO L226 Difference]: Without dead ends: 75 [2024-11-14 03:22:07,459 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 174 SyntacticMatches, 18 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=265, Invalid=1067, Unknown=0, NotChecked=0, Total=1332 [2024-11-14 03:22:07,459 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:22:07,460 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 19 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:22:07,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2024-11-14 03:22:07,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2024-11-14 03:22:07,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:07,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2024-11-14 03:22:07,512 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 69 [2024-11-14 03:22:07,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:22:07,512 INFO L471 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2024-11-14 03:22:07,512 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:22:07,512 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2024-11-14 03:22:07,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-14 03:22:07,513 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:22:07,513 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:22:07,533 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2024-11-14 03:22:07,713 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-14 03:22:07,713 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:22:07,714 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:22:07,714 INFO L85 PathProgramCache]: Analyzing trace with hash 257056152, now seen corresponding path program 24 times [2024-11-14 03:22:07,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:22:07,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625949281] [2024-11-14 03:22:07,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:22:07,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:22:07,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:22:19,595 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 27 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:22:19,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:22:19,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625949281] [2024-11-14 03:22:19,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625949281] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:22:19,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644564706] [2024-11-14 03:22:19,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:22:19,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:22:19,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:22:19,598 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:22:19,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-14 03:22:19,771 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:22:19,771 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:22:19,776 WARN L253 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 242 conjuncts are in the unsatisfiable core [2024-11-14 03:22:19,782 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:22:20,206 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:22:25,141 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:22:25,141 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:22:40,981 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-14 03:22:40,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644564706] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:22:40,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055624268] [2024-11-14 03:22:40,982 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:22:40,982 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:22:40,982 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:22:40,982 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:22:40,982 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:22:41,117 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:22:42,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15802#true' at error location [2024-11-14 03:22:42,106 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:22:42,106 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:22:42,106 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 69, 61] total 165 [2024-11-14 03:22:42,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887839248] [2024-11-14 03:22:42,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:22:42,106 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2024-11-14 03:22:42,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:22:42,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2024-11-14 03:22:42,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=700, Invalid=27692, Unknown=0, NotChecked=0, Total=28392 [2024-11-14 03:22:42,108 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 165 states, 165 states have (on average 1.0909090909090908) internal successors, (180), 165 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:05,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:23:05,162 INFO L93 Difference]: Finished difference Result 180 states and 199 transitions. [2024-11-14 03:23:05,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2024-11-14 03:23:05,163 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 1.0909090909090908) internal successors, (180), 165 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2024-11-14 03:23:05,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:23:05,164 INFO L225 Difference]: With dead ends: 180 [2024-11-14 03:23:05,164 INFO L226 Difference]: Without dead ends: 177 [2024-11-14 03:23:05,166 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 237 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12577 ImplicationChecksByTransitivity, 40.5s TimeCoverageRelationStatistics Valid=2452, Invalid=54430, Unknown=0, NotChecked=0, Total=56882 [2024-11-14 03:23:05,167 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 8992 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 9380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 8992 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.9s IncrementalHoareTripleChecker+Time [2024-11-14 03:23:05,167 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 209 Invalid, 9380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 8992 Invalid, 0 Unknown, 0 Unchecked, 7.9s Time] [2024-11-14 03:23:05,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2024-11-14 03:23:05,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 107. [2024-11-14 03:23:05,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.1037735849056605) internal successors, (117), 106 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:05,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 117 transitions. [2024-11-14 03:23:05,263 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 117 transitions. Word has length 74 [2024-11-14 03:23:05,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:23:05,263 INFO L471 AbstractCegarLoop]: Abstraction has 107 states and 117 transitions. [2024-11-14 03:23:05,263 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 1.0909090909090908) internal successors, (180), 165 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:05,263 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 117 transitions. [2024-11-14 03:23:05,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2024-11-14 03:23:05,264 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:23:05,264 INFO L215 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:23:05,283 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2024-11-14 03:23:05,464 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-14 03:23:05,464 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:23:05,465 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:23:05,465 INFO L85 PathProgramCache]: Analyzing trace with hash 134956909, now seen corresponding path program 25 times [2024-11-14 03:23:05,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:23:05,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575312727] [2024-11-14 03:23:05,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:23:05,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:23:05,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:23:05,818 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2024-11-14 03:23:05,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:23:05,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575312727] [2024-11-14 03:23:05,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575312727] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:23:05,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240502989] [2024-11-14 03:23:05,818 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:23:05,818 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:23:05,818 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:23:05,820 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:23:05,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-14 03:23:05,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:23:05,967 INFO L255 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-14 03:23:05,969 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:23:06,220 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2024-11-14 03:23:06,220 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:23:06,416 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2024-11-14 03:23:06,416 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240502989] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:23:06,416 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274548251] [2024-11-14 03:23:06,417 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:23:06,417 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:23:06,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:23:06,418 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:23:06,418 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:23:06,621 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:23:06,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17110#true' at error location [2024-11-14 03:23:06,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:23:06,785 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:23:06,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-14 03:23:06,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508224266] [2024-11-14 03:23:06,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:23:06,786 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-14 03:23:06,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:23:06,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-14 03:23:06,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=1183, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 03:23:06,788 INFO L87 Difference]: Start difference. First operand 107 states and 117 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:07,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:23:07,410 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2024-11-14 03:23:07,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2024-11-14 03:23:07,410 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2024-11-14 03:23:07,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:23:07,411 INFO L225 Difference]: With dead ends: 254 [2024-11-14 03:23:07,411 INFO L226 Difference]: Without dead ends: 108 [2024-11-14 03:23:07,411 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 190 SyntacticMatches, 19 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=299, Invalid=1183, Unknown=0, NotChecked=0, Total=1482 [2024-11-14 03:23:07,412 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 659 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 659 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:23:07,412 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 659 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:23:07,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2024-11-14 03:23:07,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2024-11-14 03:23:07,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 107 states have (on average 1.102803738317757) internal successors, (118), 107 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:07,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 118 transitions. [2024-11-14 03:23:07,502 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 118 transitions. Word has length 75 [2024-11-14 03:23:07,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:23:07,502 INFO L471 AbstractCegarLoop]: Abstraction has 108 states and 118 transitions. [2024-11-14 03:23:07,502 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:07,502 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 118 transitions. [2024-11-14 03:23:07,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2024-11-14 03:23:07,503 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:23:07,503 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:23:07,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2024-11-14 03:23:07,703 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-14 03:23:07,703 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:23:07,704 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:23:07,704 INFO L85 PathProgramCache]: Analyzing trace with hash -1325510156, now seen corresponding path program 26 times [2024-11-14 03:23:07,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:23:07,704 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520988745] [2024-11-14 03:23:07,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:23:07,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:23:07,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:23:08,071 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2024-11-14 03:23:08,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:23:08,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520988745] [2024-11-14 03:23:08,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520988745] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:23:08,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9741703] [2024-11-14 03:23:08,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:23:08,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:23:08,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:23:08,074 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:23:08,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-14 03:23:08,317 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-14 03:23:08,317 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:23:08,320 INFO L255 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-14 03:23:08,321 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:23:08,549 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2024-11-14 03:23:08,549 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:23:08,788 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2024-11-14 03:23:08,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9741703] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:23:08,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [89155103] [2024-11-14 03:23:08,789 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:23:08,789 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:23:08,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:23:08,789 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:23:08,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:23:08,919 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:23:09,047 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18789#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:23:09,047 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:23:09,047 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:23:09,047 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-14 03:23:09,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914684683] [2024-11-14 03:23:09,048 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:23:09,048 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-14 03:23:09,048 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:23:09,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-14 03:23:09,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1257, Unknown=0, NotChecked=0, Total=1560 [2024-11-14 03:23:09,049 INFO L87 Difference]: Start difference. First operand 108 states and 118 transitions. Second operand has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:09,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:23:09,382 INFO L93 Difference]: Finished difference Result 167 states and 187 transitions. [2024-11-14 03:23:09,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 03:23:09,382 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2024-11-14 03:23:09,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:23:09,384 INFO L225 Difference]: With dead ends: 167 [2024-11-14 03:23:09,384 INFO L226 Difference]: Without dead ends: 82 [2024-11-14 03:23:09,384 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 191 SyntacticMatches, 20 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1038 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2024-11-14 03:23:09,384 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:23:09,384 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 27 Invalid, 427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:23:09,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2024-11-14 03:23:09,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2024-11-14 03:23:09,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 81 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:09,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2024-11-14 03:23:09,453 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 76 [2024-11-14 03:23:09,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:23:09,454 INFO L471 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2024-11-14 03:23:09,454 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 35 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:23:09,454 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2024-11-14 03:23:09,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2024-11-14 03:23:09,454 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:23:09,454 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:23:09,469 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-14 03:23:09,655 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-14 03:23:09,655 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:23:09,655 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:23:09,655 INFO L85 PathProgramCache]: Analyzing trace with hash -610795819, now seen corresponding path program 27 times [2024-11-14 03:23:09,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:23:09,655 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962941484] [2024-11-14 03:23:09,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:23:09,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:23:09,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:23:23,359 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 38 proven. 347 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:23:23,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:23:23,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962941484] [2024-11-14 03:23:23,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962941484] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:23:23,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571672636] [2024-11-14 03:23:23,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:23:23,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:23:23,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:23:23,361 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:23:23,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-14 03:23:23,533 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:23:23,533 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:23:23,538 WARN L253 TraceCheckSpWp]: Trace formula consists of 454 conjuncts, 270 conjuncts are in the unsatisfiable core [2024-11-14 03:23:23,542 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:23:24,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:23:31,084 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:23:31,084 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:23:51,649 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2024-11-14 03:23:51,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571672636] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:23:51,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565952974] [2024-11-14 03:23:51,650 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:23:51,650 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:23:51,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:23:51,650 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:23:51,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:23:51,776 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:23:52,912 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19281#true' at error location [2024-11-14 03:23:52,912 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:23:52,912 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:23:52,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 76, 67] total 188 [2024-11-14 03:23:52,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308899922] [2024-11-14 03:23:52,913 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:23:52,913 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2024-11-14 03:23:52,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:23:52,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2024-11-14 03:23:52,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=773, Invalid=35899, Unknown=0, NotChecked=0, Total=36672 [2024-11-14 03:23:52,915 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 188 states, 188 states have (on average 1.0797872340425532) internal successors, (203), 188 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:20,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:24:20,779 INFO L93 Difference]: Finished difference Result 202 states and 221 transitions. [2024-11-14 03:24:20,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2024-11-14 03:24:20,780 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 1.0797872340425532) internal successors, (203), 188 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2024-11-14 03:24:20,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:24:20,782 INFO L225 Difference]: With dead ends: 202 [2024-11-14 03:24:20,782 INFO L226 Difference]: Without dead ends: 199 [2024-11-14 03:24:20,784 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 261 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15922 ImplicationChecksByTransitivity, 50.6s TimeCoverageRelationStatistics Valid=2447, Invalid=66459, Unknown=0, NotChecked=0, Total=68906 [2024-11-14 03:24:20,785 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 10412 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 10816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 10412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:24:20,785 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 227 Invalid, 10816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 10412 Invalid, 0 Unknown, 0 Unchecked, 9.7s Time] [2024-11-14 03:24:20,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2024-11-14 03:24:20,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 117. [2024-11-14 03:24:20,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0948275862068966) internal successors, (127), 116 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:20,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 127 transitions. [2024-11-14 03:24:20,907 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 127 transitions. Word has length 81 [2024-11-14 03:24:20,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:24:20,907 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 127 transitions. [2024-11-14 03:24:20,908 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 1.0797872340425532) internal successors, (203), 188 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:20,908 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 127 transitions. [2024-11-14 03:24:20,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2024-11-14 03:24:20,908 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:24:20,909 INFO L215 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:24:20,923 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2024-11-14 03:24:21,109 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-14 03:24:21,109 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:24:21,110 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:24:21,110 INFO L85 PathProgramCache]: Analyzing trace with hash 873093192, now seen corresponding path program 28 times [2024-11-14 03:24:21,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:24:21,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197793222] [2024-11-14 03:24:21,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:24:21,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:24:21,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:24:21,488 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2024-11-14 03:24:21,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:24:21,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197793222] [2024-11-14 03:24:21,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197793222] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:24:21,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89179105] [2024-11-14 03:24:21,489 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:24:21,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:24:21,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:24:21,491 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:24:21,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-14 03:24:21,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:24:21,658 INFO L255 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-14 03:24:21,659 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:24:21,949 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2024-11-14 03:24:21,949 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:24:22,181 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2024-11-14 03:24:22,181 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89179105] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:24:22,181 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423525223] [2024-11-14 03:24:22,182 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:24:22,182 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:24:22,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:24:22,182 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:24:22,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:24:22,370 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:24:22,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20720#true' at error location [2024-11-14 03:24:22,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:24:22,528 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:24:22,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-14 03:24:22,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351271262] [2024-11-14 03:24:22,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:24:22,529 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 03:24:22,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:24:22,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 03:24:22,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 03:24:22,530 INFO L87 Difference]: Start difference. First operand 117 states and 127 transitions. Second operand has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:23,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:24:23,199 INFO L93 Difference]: Finished difference Result 278 states and 303 transitions. [2024-11-14 03:24:23,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-14 03:24:23,200 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2024-11-14 03:24:23,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:24:23,201 INFO L225 Difference]: With dead ends: 278 [2024-11-14 03:24:23,201 INFO L226 Difference]: Without dead ends: 118 [2024-11-14 03:24:23,202 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 208 SyntacticMatches, 21 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1000 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2024-11-14 03:24:23,203 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 841 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 841 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:24:23,203 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 841 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:24:23,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2024-11-14 03:24:23,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2024-11-14 03:24:23,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.0940170940170941) internal successors, (128), 117 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:23,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2024-11-14 03:24:23,319 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 82 [2024-11-14 03:24:23,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:24:23,319 INFO L471 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2024-11-14 03:24:23,319 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:23,319 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2024-11-14 03:24:23,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2024-11-14 03:24:23,319 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:24:23,320 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:24:23,333 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2024-11-14 03:24:23,520 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:24:23,520 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:24:23,520 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:24:23,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1221150751, now seen corresponding path program 29 times [2024-11-14 03:24:23,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:24:23,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104248691] [2024-11-14 03:24:23,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:24:23,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:24:23,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:24:23,953 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2024-11-14 03:24:23,953 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:24:23,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104248691] [2024-11-14 03:24:23,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104248691] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:24:23,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928172907] [2024-11-14 03:24:23,953 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:24:23,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:24:23,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:24:23,955 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:24:23,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-14 03:24:24,252 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 03:24:24,252 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:24:24,256 INFO L255 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-14 03:24:24,257 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:24:24,506 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2024-11-14 03:24:24,506 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:24:24,771 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2024-11-14 03:24:24,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928172907] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:24:24,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [261193747] [2024-11-14 03:24:24,773 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:24:24,773 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:24:24,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:24:24,773 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:24:24,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:24:24,898 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:24:25,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22557#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:24:25,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:24:25,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:24:25,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-14 03:24:25,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092524351] [2024-11-14 03:24:25,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:24:25,032 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-14 03:24:25,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:24:25,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-14 03:24:25,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1453, Unknown=0, NotChecked=0, Total=1806 [2024-11-14 03:24:25,033 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:25,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:24:25,406 INFO L93 Difference]: Finished difference Result 182 states and 202 transitions. [2024-11-14 03:24:25,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 03:24:25,407 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2024-11-14 03:24:25,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:24:25,408 INFO L225 Difference]: With dead ends: 182 [2024-11-14 03:24:25,408 INFO L226 Difference]: Without dead ends: 89 [2024-11-14 03:24:25,409 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 209 SyntacticMatches, 22 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=367, Invalid=1525, Unknown=0, NotChecked=0, Total=1892 [2024-11-14 03:24:25,409 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-14 03:24:25,409 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 15 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-14 03:24:25,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2024-11-14 03:24:25,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2024-11-14 03:24:25,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:25,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2024-11-14 03:24:25,499 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 83 [2024-11-14 03:24:25,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:24:25,499 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2024-11-14 03:24:25,500 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:24:25,500 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2024-11-14 03:24:25,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-14 03:24:25,500 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:24:25,500 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:24:25,523 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2024-11-14 03:24:25,701 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:24:25,701 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:24:25,701 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:24:25,701 INFO L85 PathProgramCache]: Analyzing trace with hash 2123029752, now seen corresponding path program 30 times [2024-11-14 03:24:25,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:24:25,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892933632] [2024-11-14 03:24:25,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:24:25,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:24:26,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:24:42,818 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 22 proven. 440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:24:42,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:24:42,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892933632] [2024-11-14 03:24:42,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892933632] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:24:42,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233065331] [2024-11-14 03:24:42,819 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:24:42,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:24:42,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:24:42,821 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:24:42,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-14 03:24:43,013 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:24:43,013 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:24:43,020 WARN L253 TraceCheckSpWp]: Trace formula consists of 493 conjuncts, 294 conjuncts are in the unsatisfiable core [2024-11-14 03:24:43,024 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:24:43,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:24:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:24:51,153 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:12,454 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2024-11-14 03:25:12,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233065331] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:12,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306522109] [2024-11-14 03:25:12,455 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:25:12,455 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:12,455 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:12,455 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:12,455 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:25:12,573 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:25:13,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23093#true' at error location [2024-11-14 03:25:13,717 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:25:13,718 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:25:13,718 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 83, 73] total 204 [2024-11-14 03:25:13,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810802943] [2024-11-14 03:25:13,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:25:13,718 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 204 states [2024-11-14 03:25:13,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:13,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 204 interpolants. [2024-11-14 03:25:13,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1149, Invalid=41907, Unknown=0, NotChecked=0, Total=43056 [2024-11-14 03:25:13,721 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 204 states, 204 states have (on average 1.0735294117647058) internal successors, (219), 204 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:42,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:42,560 INFO L93 Difference]: Finished difference Result 210 states and 232 transitions. [2024-11-14 03:25:42,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2024-11-14 03:25:42,560 INFO L78 Accepts]: Start accepts. Automaton has has 204 states, 204 states have (on average 1.0735294117647058) internal successors, (219), 204 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2024-11-14 03:25:42,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:42,561 INFO L225 Difference]: With dead ends: 210 [2024-11-14 03:25:42,561 INFO L226 Difference]: Without dead ends: 207 [2024-11-14 03:25:42,563 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22887 ImplicationChecksByTransitivity, 52.4s TimeCoverageRelationStatistics Valid=2727, Invalid=74279, Unknown=0, NotChecked=0, Total=77006 [2024-11-14 03:25:42,564 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 11031 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 11226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 11031 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.9s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:42,564 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 209 Invalid, 11226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 11031 Invalid, 0 Unknown, 0 Unchecked, 10.9s Time] [2024-11-14 03:25:42,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2024-11-14 03:25:42,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 127. [2024-11-14 03:25:42,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:42,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2024-11-14 03:25:42,727 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 88 [2024-11-14 03:25:42,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:42,727 INFO L471 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2024-11-14 03:25:42,727 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 204 states, 204 states have (on average 1.0735294117647058) internal successors, (219), 204 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:42,728 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2024-11-14 03:25:42,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2024-11-14 03:25:42,728 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:42,728 INFO L215 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:42,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-14 03:25:42,929 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:42,929 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:42,929 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:42,929 INFO L85 PathProgramCache]: Analyzing trace with hash 229740301, now seen corresponding path program 31 times [2024-11-14 03:25:42,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:42,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817090727] [2024-11-14 03:25:42,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:42,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:42,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,451 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2024-11-14 03:25:43,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:43,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817090727] [2024-11-14 03:25:43,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817090727] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:25:43,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505254297] [2024-11-14 03:25:43,452 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:25:43,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:43,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:43,456 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:43,457 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-14 03:25:43,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:43,658 INFO L255 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-14 03:25:43,660 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:44,026 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2024-11-14 03:25:44,026 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:44,328 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2024-11-14 03:25:44,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505254297] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:44,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1906276185] [2024-11-14 03:25:44,329 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:25:44,330 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:44,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:44,330 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:44,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:25:44,462 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:25:44,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24624#true' at error location [2024-11-14 03:25:44,630 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:25:44,630 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:25:44,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-14 03:25:44,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070073755] [2024-11-14 03:25:44,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:25:44,631 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-14 03:25:44,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:44,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-14 03:25:44,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1577, Unknown=0, NotChecked=0, Total=1980 [2024-11-14 03:25:44,632 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:45,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:45,338 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2024-11-14 03:25:45,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-14 03:25:45,338 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2024-11-14 03:25:45,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:45,340 INFO L225 Difference]: With dead ends: 302 [2024-11-14 03:25:45,340 INFO L226 Difference]: Without dead ends: 128 [2024-11-14 03:25:45,341 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 226 SyntacticMatches, 23 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1164 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=403, Invalid=1577, Unknown=0, NotChecked=0, Total=1980 [2024-11-14 03:25:45,341 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 636 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 726 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 636 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:45,341 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 15 Invalid, 726 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 636 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-14 03:25:45,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2024-11-14 03:25:45,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2024-11-14 03:25:45,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.0866141732283465) internal successors, (138), 127 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:45,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2024-11-14 03:25:45,500 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 89 [2024-11-14 03:25:45,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:45,501 INFO L471 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2024-11-14 03:25:45,501 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:45,501 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2024-11-14 03:25:45,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2024-11-14 03:25:45,501 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:45,501 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:45,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2024-11-14 03:25:45,702 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:45,702 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:45,702 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:45,702 INFO L85 PathProgramCache]: Analyzing trace with hash -2042617516, now seen corresponding path program 32 times [2024-11-14 03:25:45,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:45,702 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856016813] [2024-11-14 03:25:45,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:45,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:45,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:25:46,149 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2024-11-14 03:25:46,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:25:46,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856016813] [2024-11-14 03:25:46,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856016813] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:25:46,149 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430852958] [2024-11-14 03:25:46,149 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:25:46,149 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:46,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:25:46,151 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:25:46,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-14 03:25:46,398 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-14 03:25:46,398 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:25:46,402 INFO L255 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-14 03:25:46,404 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:25:46,983 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2024-11-14 03:25:46,983 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:25:47,494 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2024-11-14 03:25:47,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430852958] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:25:47,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089137159] [2024-11-14 03:25:47,495 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:25:47,495 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:25:47,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:25:47,496 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:25:47,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:25:47,633 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:25:47,775 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26044#true' at error location [2024-11-14 03:25:47,775 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:25:47,775 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:25:47,776 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 52 [2024-11-14 03:25:47,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40393796] [2024-11-14 03:25:47,776 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:25:47,776 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2024-11-14 03:25:47,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:25:47,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2024-11-14 03:25:47,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=2494, Unknown=0, NotChecked=0, Total=2970 [2024-11-14 03:25:47,777 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand has 52 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:48,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:25:48,661 INFO L93 Difference]: Finished difference Result 197 states and 217 transitions. [2024-11-14 03:25:48,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-14 03:25:48,661 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2024-11-14 03:25:48,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:25:48,662 INFO L225 Difference]: With dead ends: 197 [2024-11-14 03:25:48,662 INFO L226 Difference]: Without dead ends: 96 [2024-11-14 03:25:48,663 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 230 SyntacticMatches, 24 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2563 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=748, Invalid=3808, Unknown=0, NotChecked=0, Total=4556 [2024-11-14 03:25:48,663 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 994 mSolverCounterSat, 335 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 335 IncrementalHoareTripleChecker+Valid, 994 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 03:25:48,663 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 29 Invalid, 1329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [335 Valid, 994 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 03:25:48,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2024-11-14 03:25:48,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2024-11-14 03:25:48,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0736842105263158) internal successors, (102), 95 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:48,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2024-11-14 03:25:48,775 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 90 [2024-11-14 03:25:48,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:25:48,775 INFO L471 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2024-11-14 03:25:48,775 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.6923076923076923) internal successors, (88), 52 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:25:48,775 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2024-11-14 03:25:48,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2024-11-14 03:25:48,775 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:25:48,775 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:25:48,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2024-11-14 03:25:48,976 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:25:48,976 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:25:48,976 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:25:48,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1917994869, now seen corresponding path program 33 times [2024-11-14 03:25:48,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:25:48,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822088747] [2024-11-14 03:25:48,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:25:48,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:25:49,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:26:11,391 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 46 proven. 500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:26:11,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:26:11,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822088747] [2024-11-14 03:26:11,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822088747] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:26:11,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94045208] [2024-11-14 03:26:11,391 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:26:11,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:26:11,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:26:11,393 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:26:11,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-14 03:26:11,607 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:26:11,607 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:26:11,613 WARN L253 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 322 conjuncts are in the unsatisfiable core [2024-11-14 03:26:11,616 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:26:11,922 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:26:22,601 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:26:22,601 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:26:58,867 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2024-11-14 03:26:58,868 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94045208] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:26:58,868 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [128700089] [2024-11-14 03:26:58,869 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:26:58,869 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:26:58,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:26:58,869 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:26:58,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:26:59,005 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:27:00,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27244#true' at error location [2024-11-14 03:27:00,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:27:00,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:27:00,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 90, 79] total 214 [2024-11-14 03:27:00,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821294658] [2024-11-14 03:27:00,666 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:27:00,666 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 214 states [2024-11-14 03:27:00,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:27:00,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 214 interpolants. [2024-11-14 03:27:00,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=858, Invalid=46448, Unknown=0, NotChecked=0, Total=47306 [2024-11-14 03:27:00,670 INFO L87 Difference]: Start difference. First operand 96 states and 102 transitions. Second operand has 214 states, 214 states have (on average 1.0700934579439252) internal successors, (229), 214 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:27:57,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:27:57,516 INFO L93 Difference]: Finished difference Result 230 states and 249 transitions. [2024-11-14 03:27:57,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2024-11-14 03:27:57,517 INFO L78 Accepts]: Start accepts. Automaton has has 214 states, 214 states have (on average 1.0700934579439252) internal successors, (229), 214 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2024-11-14 03:27:57,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:27:57,519 INFO L225 Difference]: With dead ends: 230 [2024-11-14 03:27:57,519 INFO L226 Difference]: Without dead ends: 227 [2024-11-14 03:27:57,523 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 160 SyntacticMatches, 1 SemanticMatches, 322 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19554 ImplicationChecksByTransitivity, 95.0s TimeCoverageRelationStatistics Valid=4547, Invalid=100105, Unknown=0, NotChecked=0, Total=104652 [2024-11-14 03:27:57,524 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 1 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 15193 mSolverCounterSat, 624 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 15817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 624 IncrementalHoareTripleChecker+Valid, 15193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.6s IncrementalHoareTripleChecker+Time [2024-11-14 03:27:57,524 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 287 Invalid, 15817 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [624 Valid, 15193 Invalid, 0 Unknown, 0 Unchecked, 16.6s Time] [2024-11-14 03:27:57,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2024-11-14 03:27:57,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 137. [2024-11-14 03:27:57,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 136 states have (on average 1.0808823529411764) internal successors, (147), 136 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:27:57,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 147 transitions. [2024-11-14 03:27:57,758 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 147 transitions. Word has length 95 [2024-11-14 03:27:57,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:27:57,758 INFO L471 AbstractCegarLoop]: Abstraction has 137 states and 147 transitions. [2024-11-14 03:27:57,759 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 214 states, 214 states have (on average 1.0700934579439252) internal successors, (229), 214 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:27:57,759 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 147 transitions. [2024-11-14 03:27:57,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2024-11-14 03:27:57,759 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:27:57,759 INFO L215 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:27:57,774 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2024-11-14 03:27:57,959 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2024-11-14 03:27:57,960 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:27:57,960 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:27:57,960 INFO L85 PathProgramCache]: Analyzing trace with hash 463762600, now seen corresponding path program 34 times [2024-11-14 03:27:57,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:27:57,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902504663] [2024-11-14 03:27:57,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:27:57,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:27:57,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:27:58,558 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2024-11-14 03:27:58,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:27:58,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902504663] [2024-11-14 03:27:58,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902504663] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:27:58,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815341918] [2024-11-14 03:27:58,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:27:58,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:27:58,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:27:58,562 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:27:58,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2024-11-14 03:27:58,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:27:58,767 INFO L255 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 03:27:58,768 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:27:59,158 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2024-11-14 03:27:59,158 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:27:59,459 INFO L134 CoverageAnalysis]: Checked inductivity of 559 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2024-11-14 03:27:59,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815341918] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:27:59,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735209914] [2024-11-14 03:27:59,460 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:27:59,460 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:27:59,460 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:27:59,460 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:27:59,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:27:59,606 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:27:59,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28959#true' at error location [2024-11-14 03:27:59,767 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:27:59,767 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:27:59,767 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2024-11-14 03:27:59,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402734979] [2024-11-14 03:27:59,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:27:59,767 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-14 03:27:59,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:27:59,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-14 03:27:59,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1795, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 03:27:59,768 INFO L87 Difference]: Start difference. First operand 137 states and 147 transitions. Second operand has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:00,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:28:00,592 INFO L93 Difference]: Finished difference Result 326 states and 351 transitions. [2024-11-14 03:28:00,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-14 03:28:00,594 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2024-11-14 03:28:00,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:28:00,595 INFO L225 Difference]: With dead ends: 326 [2024-11-14 03:28:00,595 INFO L226 Difference]: Without dead ends: 138 [2024-11-14 03:28:00,596 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 244 SyntacticMatches, 25 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=461, Invalid=1795, Unknown=0, NotChecked=0, Total=2256 [2024-11-14 03:28:00,597 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:28:00,597 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:28:00,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2024-11-14 03:28:00,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2024-11-14 03:28:00,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.0802919708029197) internal successors, (148), 137 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:00,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 148 transitions. [2024-11-14 03:28:00,794 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 148 transitions. Word has length 96 [2024-11-14 03:28:00,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:28:00,795 INFO L471 AbstractCegarLoop]: Abstraction has 138 states and 148 transitions. [2024-11-14 03:28:00,795 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.3409090909090908) internal successors, (59), 44 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:00,795 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 148 transitions. [2024-11-14 03:28:00,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2024-11-14 03:28:00,796 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:28:00,796 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:28:00,820 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2024-11-14 03:28:01,000 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2024-11-14 03:28:01,000 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:28:01,000 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:28:01,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1033825151, now seen corresponding path program 35 times [2024-11-14 03:28:01,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:28:01,001 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049049593] [2024-11-14 03:28:01,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:28:01,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:28:01,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:28:01,581 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2024-11-14 03:28:01,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:28:01,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049049593] [2024-11-14 03:28:01,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2049049593] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:28:01,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753530467] [2024-11-14 03:28:01,582 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:28:01,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:28:01,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:28:01,584 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:28:01,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2024-11-14 03:28:02,098 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-14 03:28:02,098 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:28:02,102 INFO L255 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-14 03:28:02,105 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:28:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2024-11-14 03:28:02,757 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:28:03,278 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 78 proven. 91 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2024-11-14 03:28:03,278 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753530467] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:28:03,278 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411371679] [2024-11-14 03:28:03,279 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:28:03,279 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:28:03,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:28:03,279 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:28:03,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:28:03,414 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:28:03,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31124#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:28:03,611 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:28:03,612 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:28:03,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 56 [2024-11-14 03:28:03,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158232784] [2024-11-14 03:28:03,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:28:03,612 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2024-11-14 03:28:03,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:28:03,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2024-11-14 03:28:03,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=3105, Unknown=0, NotChecked=0, Total=3660 [2024-11-14 03:28:03,613 INFO L87 Difference]: Start difference. First operand 138 states and 148 transitions. Second operand has 56 states, 56 states have (on average 1.625) internal successors, (91), 56 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:04,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:28:04,827 INFO L93 Difference]: Finished difference Result 212 states and 232 transitions. [2024-11-14 03:28:04,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2024-11-14 03:28:04,827 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.625) internal successors, (91), 56 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2024-11-14 03:28:04,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:28:04,829 INFO L225 Difference]: With dead ends: 212 [2024-11-14 03:28:04,829 INFO L226 Difference]: Without dead ends: 103 [2024-11-14 03:28:04,830 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 246 SyntacticMatches, 26 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3171 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=869, Invalid=4681, Unknown=0, NotChecked=0, Total=5550 [2024-11-14 03:28:04,830 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1351 mSolverCounterSat, 369 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 1720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 369 IncrementalHoareTripleChecker+Valid, 1351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:28:04,830 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 33 Invalid, 1720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [369 Valid, 1351 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-14 03:28:04,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2024-11-14 03:28:05,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2024-11-14 03:28:05,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 102 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:05,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2024-11-14 03:28:05,010 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 97 [2024-11-14 03:28:05,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:28:05,011 INFO L471 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2024-11-14 03:28:05,011 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.625) internal successors, (91), 56 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:28:05,011 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2024-11-14 03:28:05,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2024-11-14 03:28:05,011 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:28:05,012 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:28:05,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2024-11-14 03:28:05,212 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2024-11-14 03:28:05,212 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:28:05,212 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:28:05,212 INFO L85 PathProgramCache]: Analyzing trace with hash -106662824, now seen corresponding path program 36 times [2024-11-14 03:28:05,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:28:05,213 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745139097] [2024-11-14 03:28:05,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:28:05,213 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:28:05,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:28:30,815 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 36 proven. 601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:28:30,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:28:30,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745139097] [2024-11-14 03:28:30,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745139097] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:28:30,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464434378] [2024-11-14 03:28:30,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:28:30,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:28:30,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:28:30,817 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:28:30,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2024-11-14 03:28:31,051 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:28:31,051 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:28:31,057 WARN L253 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 346 conjuncts are in the unsatisfiable core [2024-11-14 03:28:31,061 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:28:32,150 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:28:42,896 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 0 proven. 637 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:28:42,896 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:29:14,722 INFO L134 CoverageAnalysis]: Checked inductivity of 637 backedges. 0 proven. 546 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2024-11-14 03:29:14,722 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464434378] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:29:14,722 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2127899958] [2024-11-14 03:29:14,723 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:29:14,723 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:29:14,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:29:14,723 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:29:14,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:29:14,847 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:29:16,300 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31787#true' at error location [2024-11-14 03:29:16,301 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:29:16,301 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:29:16,301 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 97, 85] total 239 [2024-11-14 03:29:16,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370602028] [2024-11-14 03:29:16,301 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:29:16,302 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 239 states [2024-11-14 03:29:16,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:29:16,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 239 interpolants. [2024-11-14 03:29:16,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1439, Invalid=57367, Unknown=0, NotChecked=0, Total=58806 [2024-11-14 03:29:16,305 INFO L87 Difference]: Start difference. First operand 103 states and 109 transitions. Second operand has 239 states, 239 states have (on average 1.0627615062761506) internal successors, (254), 239 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:29:58,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:29:58,940 INFO L93 Difference]: Finished difference Result 248 states and 270 transitions. [2024-11-14 03:29:58,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 149 states. [2024-11-14 03:29:58,940 INFO L78 Accepts]: Start accepts. Automaton has has 239 states, 239 states have (on average 1.0627615062761506) internal successors, (254), 239 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2024-11-14 03:29:58,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:29:58,942 INFO L225 Difference]: With dead ends: 248 [2024-11-14 03:29:58,942 INFO L226 Difference]: Without dead ends: 245 [2024-11-14 03:29:58,946 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 320 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32200 ImplicationChecksByTransitivity, 75.1s TimeCoverageRelationStatistics Valid=3319, Invalid=100043, Unknown=0, NotChecked=0, Total=103362 [2024-11-14 03:29:58,947 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 274 mSDsCounter, 0 mSdLazyCounter, 15679 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 16067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 15679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:29:58,947 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 277 Invalid, 16067 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [388 Valid, 15679 Invalid, 0 Unknown, 0 Unchecked, 17.7s Time] [2024-11-14 03:29:58,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2024-11-14 03:29:59,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 147. [2024-11-14 03:29:59,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 146 states have (on average 1.0753424657534247) internal successors, (157), 146 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:29:59,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 157 transitions. [2024-11-14 03:29:59,193 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 157 transitions. Word has length 102 [2024-11-14 03:29:59,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:29:59,193 INFO L471 AbstractCegarLoop]: Abstraction has 147 states and 157 transitions. [2024-11-14 03:29:59,194 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 239 states, 239 states have (on average 1.0627615062761506) internal successors, (254), 239 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:29:59,194 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 157 transitions. [2024-11-14 03:29:59,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2024-11-14 03:29:59,194 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:29:59,194 INFO L215 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:29:59,208 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2024-11-14 03:29:59,395 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2024-11-14 03:29:59,395 INFO L396 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:29:59,395 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:29:59,395 INFO L85 PathProgramCache]: Analyzing trace with hash -966984019, now seen corresponding path program 37 times [2024-11-14 03:29:59,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:29:59,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585463500] [2024-11-14 03:29:59,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:29:59,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:29:59,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:00,124 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 92 proven. 104 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2024-11-14 03:30:00,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:00,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585463500] [2024-11-14 03:30:00,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585463500] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:00,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226798552] [2024-11-14 03:30:00,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:30:00,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:00,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:00,127 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:00,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2024-11-14 03:30:00,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:00,349 INFO L255 TraceCheckSpWp]: Trace formula consists of 576 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-14 03:30:00,352 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:00,794 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2024-11-14 03:30:00,794 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:01,157 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 105 proven. 91 refuted. 0 times theorem prover too weak. 455 trivial. 0 not checked. [2024-11-14 03:30:01,157 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226798552] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:30:01,157 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1069275293] [2024-11-14 03:30:01,158 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:30:01,158 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:01,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:01,158 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:01,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:30:01,291 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:30:01,480 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34230#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:30:01,480 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:30:01,480 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:30:01,480 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 47 [2024-11-14 03:30:01,480 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966710555] [2024-11-14 03:30:01,480 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:30:01,480 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2024-11-14 03:30:01,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:30:01,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2024-11-14 03:30:01,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=513, Invalid=2139, Unknown=0, NotChecked=0, Total=2652 [2024-11-14 03:30:01,481 INFO L87 Difference]: Start difference. First operand 147 states and 157 transitions. Second operand has 47 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:02,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:02,420 INFO L93 Difference]: Finished difference Result 350 states and 375 transitions. [2024-11-14 03:30:02,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-14 03:30:02,420 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 103 [2024-11-14 03:30:02,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:02,422 INFO L225 Difference]: With dead ends: 350 [2024-11-14 03:30:02,422 INFO L226 Difference]: Without dead ends: 148 [2024-11-14 03:30:02,422 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 261 SyntacticMatches, 27 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1559 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=513, Invalid=2139, Unknown=0, NotChecked=0, Total=2652 [2024-11-14 03:30:02,423 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 897 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:02,423 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 1032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 897 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:30:02,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2024-11-14 03:30:02,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2024-11-14 03:30:02,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 147 states have (on average 1.0748299319727892) internal successors, (158), 147 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:02,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 158 transitions. [2024-11-14 03:30:02,650 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 158 transitions. Word has length 103 [2024-11-14 03:30:02,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:02,650 INFO L471 AbstractCegarLoop]: Abstraction has 148 states and 158 transitions. [2024-11-14 03:30:02,650 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.3191489361702127) internal successors, (62), 47 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:02,650 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 158 transitions. [2024-11-14 03:30:02,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-11-14 03:30:02,651 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:02,651 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:30:02,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2024-11-14 03:30:02,851 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:02,852 INFO L396 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:02,852 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:02,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1021216948, now seen corresponding path program 38 times [2024-11-14 03:30:02,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:02,852 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62056708] [2024-11-14 03:30:02,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:02,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:02,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:03,448 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 78 proven. 118 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2024-11-14 03:30:03,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:03,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62056708] [2024-11-14 03:30:03,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62056708] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:03,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7677706] [2024-11-14 03:30:03,448 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:30:03,448 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:03,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:03,451 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:03,456 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2024-11-14 03:30:03,957 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-14 03:30:03,957 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:30:03,962 INFO L255 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 30 conjuncts are in the unsatisfiable core [2024-11-14 03:30:03,963 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:04,666 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2024-11-14 03:30:04,666 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:30:05,232 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 91 proven. 105 refuted. 0 times theorem prover too weak. 469 trivial. 0 not checked. [2024-11-14 03:30:05,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [7677706] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:30:05,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1904669461] [2024-11-14 03:30:05,233 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:30:05,233 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:30:05,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:30:05,233 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:30:05,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:30:05,356 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:30:05,544 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35896#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:30:05,545 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:30:05,545 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:30:05,545 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 60 [2024-11-14 03:30:05,545 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843284534] [2024-11-14 03:30:05,545 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:30:05,545 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2024-11-14 03:30:05,545 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:30:05,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2024-11-14 03:30:05,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=3529, Unknown=0, NotChecked=0, Total=4160 [2024-11-14 03:30:05,546 INFO L87 Difference]: Start difference. First operand 148 states and 158 transitions. Second operand has 60 states, 60 states have (on average 1.6) internal successors, (96), 60 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:06,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:30:06,677 INFO L93 Difference]: Finished difference Result 227 states and 247 transitions. [2024-11-14 03:30:06,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2024-11-14 03:30:06,677 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.6) internal successors, (96), 60 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2024-11-14 03:30:06,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:30:06,679 INFO L225 Difference]: With dead ends: 227 [2024-11-14 03:30:06,679 INFO L226 Difference]: Without dead ends: 110 [2024-11-14 03:30:06,679 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 264 SyntacticMatches, 28 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3654 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=990, Invalid=5330, Unknown=0, NotChecked=0, Total=6320 [2024-11-14 03:30:06,679 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 50 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 407 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 1718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 407 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-14 03:30:06,680 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 31 Invalid, 1718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [407 Valid, 1311 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-14 03:30:06,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2024-11-14 03:30:06,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2024-11-14 03:30:06,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.0642201834862386) internal successors, (116), 109 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:06,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 116 transitions. [2024-11-14 03:30:06,862 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 116 transitions. Word has length 104 [2024-11-14 03:30:06,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:30:06,863 INFO L471 AbstractCegarLoop]: Abstraction has 110 states and 116 transitions. [2024-11-14 03:30:06,863 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.6) internal successors, (96), 60 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:30:06,863 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 116 transitions. [2024-11-14 03:30:06,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2024-11-14 03:30:06,863 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:30:06,863 INFO L215 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:30:06,878 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2024-11-14 03:30:07,063 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2024-11-14 03:30:07,064 INFO L396 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:30:07,064 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:30:07,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1930659819, now seen corresponding path program 39 times [2024-11-14 03:30:07,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:30:07,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521572677] [2024-11-14 03:30:07,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:30:07,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:30:07,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:30:36,774 INFO L134 CoverageAnalysis]: Checked inductivity of 735 backedges. 55 proven. 680 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:30:36,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:30:36,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521572677] [2024-11-14 03:30:36,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521572677] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:30:36,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127131482] [2024-11-14 03:30:36,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-14 03:30:36,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:30:36,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:30:36,776 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:30:36,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2024-11-14 03:30:37,027 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-14 03:30:37,027 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:30:37,033 WARN L253 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 374 conjuncts are in the unsatisfiable core [2024-11-14 03:30:37,037 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:30:37,231 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-14 03:30:51,467 INFO L134 CoverageAnalysis]: Checked inductivity of 735 backedges. 0 proven. 735 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-14 03:30:51,467 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:31:39,843 INFO L134 CoverageAnalysis]: Checked inductivity of 735 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2024-11-14 03:31:39,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127131482] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:31:39,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1378478188] [2024-11-14 03:31:39,845 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:31:39,845 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:31:39,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:31:39,845 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:31:39,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:31:39,960 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:31:41,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36606#true' at error location [2024-11-14 03:31:41,999 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:31:41,999 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:31:41,999 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 104, 91] total 249 [2024-11-14 03:31:41,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049037218] [2024-11-14 03:31:41,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:31:42,000 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 249 states [2024-11-14 03:31:42,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:31:42,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 249 interpolants. [2024-11-14 03:31:42,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1206, Invalid=62550, Unknown=0, NotChecked=0, Total=63756 [2024-11-14 03:31:42,004 INFO L87 Difference]: Start difference. First operand 110 states and 116 transitions. Second operand has 249 states, 249 states have (on average 1.0602409638554218) internal successors, (264), 249 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:39,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:32:39,392 INFO L93 Difference]: Finished difference Result 259 states and 281 transitions. [2024-11-14 03:32:39,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 160 states. [2024-11-14 03:32:39,392 INFO L78 Accepts]: Start accepts. Automaton has has 249 states, 249 states have (on average 1.0602409638554218) internal successors, (264), 249 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2024-11-14 03:32:39,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:32:39,395 INFO L225 Difference]: With dead ends: 259 [2024-11-14 03:32:39,395 INFO L226 Difference]: Without dead ends: 256 [2024-11-14 03:32:39,398 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 347 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26207 ImplicationChecksByTransitivity, 109.4s TimeCoverageRelationStatistics Valid=3908, Invalid=117544, Unknown=0, NotChecked=0, Total=121452 [2024-11-14 03:32:39,398 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 18585 mSolverCounterSat, 311 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 18896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 311 IncrementalHoareTripleChecker+Valid, 18585 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:32:39,398 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 309 Invalid, 18896 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [311 Valid, 18585 Invalid, 0 Unknown, 0 Unchecked, 20.4s Time] [2024-11-14 03:32:39,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2024-11-14 03:32:39,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 157. [2024-11-14 03:32:39,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0705128205128205) internal successors, (167), 156 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:39,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 167 transitions. [2024-11-14 03:32:39,708 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 167 transitions. Word has length 109 [2024-11-14 03:32:39,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:32:39,708 INFO L471 AbstractCegarLoop]: Abstraction has 157 states and 167 transitions. [2024-11-14 03:32:39,708 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 249 states, 249 states have (on average 1.0602409638554218) internal successors, (264), 249 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:39,708 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 167 transitions. [2024-11-14 03:32:39,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2024-11-14 03:32:39,709 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:32:39,709 INFO L215 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:32:39,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2024-11-14 03:32:39,910 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:39,910 INFO L396 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:32:39,910 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:32:39,910 INFO L85 PathProgramCache]: Analyzing trace with hash -923637496, now seen corresponding path program 40 times [2024-11-14 03:32:39,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:32:39,910 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370348863] [2024-11-14 03:32:39,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:32:39,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:32:39,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:32:40,555 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 106 proven. 119 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2024-11-14 03:32:40,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:32:40,555 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370348863] [2024-11-14 03:32:40,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370348863] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:32:40,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604880487] [2024-11-14 03:32:40,556 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-14 03:32:40,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:40,556 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:32:40,557 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:32:40,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2024-11-14 03:32:40,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:32:40,797 INFO L255 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-14 03:32:40,799 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:32:41,291 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2024-11-14 03:32:41,291 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:32:41,676 INFO L134 CoverageAnalysis]: Checked inductivity of 750 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2024-11-14 03:32:41,677 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604880487] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:32:41,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519130465] [2024-11-14 03:32:41,678 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:32:41,678 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:32:41,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:32:41,678 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:32:41,678 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:32:41,806 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:32:41,990 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38518#true' at error location [2024-11-14 03:32:41,990 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:32:41,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:32:41,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 50 [2024-11-14 03:32:41,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23315240] [2024-11-14 03:32:41,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:32:41,991 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2024-11-14 03:32:41,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:32:41,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2024-11-14 03:32:41,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=589, Invalid=2273, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 03:32:41,992 INFO L87 Difference]: Start difference. First operand 157 states and 167 transitions. Second operand has 50 states, 50 states have (on average 1.3) internal successors, (65), 50 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:42,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:32:42,948 INFO L93 Difference]: Finished difference Result 374 states and 399 transitions. [2024-11-14 03:32:42,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-14 03:32:42,948 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.3) internal successors, (65), 50 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 110 [2024-11-14 03:32:42,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:32:42,950 INFO L225 Difference]: With dead ends: 374 [2024-11-14 03:32:42,950 INFO L226 Difference]: Without dead ends: 158 [2024-11-14 03:32:42,950 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 280 SyntacticMatches, 29 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1728 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=589, Invalid=2273, Unknown=0, NotChecked=0, Total=2862 [2024-11-14 03:32:42,951 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 671 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 671 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-14 03:32:42,951 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 671 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-14 03:32:42,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2024-11-14 03:32:43,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 158. [2024-11-14 03:32:43,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 157 states have (on average 1.070063694267516) internal successors, (168), 157 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:43,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 168 transitions. [2024-11-14 03:32:43,215 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 168 transitions. Word has length 110 [2024-11-14 03:32:43,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:32:43,215 INFO L471 AbstractCegarLoop]: Abstraction has 158 states and 168 transitions. [2024-11-14 03:32:43,215 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.3) internal successors, (65), 50 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:43,215 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 168 transitions. [2024-11-14 03:32:43,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2024-11-14 03:32:43,216 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:32:43,216 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:32:43,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2024-11-14 03:32:43,416 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:43,416 INFO L396 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:32:43,416 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:32:43,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1755961633, now seen corresponding path program 41 times [2024-11-14 03:32:43,417 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:32:43,417 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275237397] [2024-11-14 03:32:43,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:32:43,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:32:43,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-14 03:32:44,071 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 91 proven. 134 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2024-11-14 03:32:44,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-14 03:32:44,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275237397] [2024-11-14 03:32:44,071 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275237397] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-14 03:32:44,071 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933789842] [2024-11-14 03:32:44,071 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-14 03:32:44,071 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:44,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 [2024-11-14 03:32:44,073 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-14 03:32:44,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2024-11-14 03:32:44,570 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-14 03:32:44,570 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-14 03:32:44,575 INFO L255 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-14 03:32:44,577 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-14 03:32:45,419 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2024-11-14 03:32:45,419 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-14 03:32:46,279 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 120 proven. 105 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2024-11-14 03:32:46,279 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933789842] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-14 03:32:46,279 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1809300410] [2024-11-14 03:32:46,280 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-14 03:32:46,280 INFO L166 IcfgInterpreter]: Building call graph [2024-11-14 03:32:46,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-14 03:32:46,280 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-14 03:32:46,280 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-14 03:32:46,426 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-14 03:32:46,705 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41015#(= |ULTIMATE.start_main_~#a~0#1.offset| 0)' at error location [2024-11-14 03:32:46,705 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-14 03:32:46,706 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-14 03:32:46,706 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 78 [2024-11-14 03:32:46,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499197264] [2024-11-14 03:32:46,706 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-14 03:32:46,706 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2024-11-14 03:32:46,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-14 03:32:46,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2024-11-14 03:32:46,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=813, Invalid=5993, Unknown=0, NotChecked=0, Total=6806 [2024-11-14 03:32:46,708 INFO L87 Difference]: Start difference. First operand 158 states and 168 transitions. Second operand has 78 states, 78 states have (on average 1.205128205128205) internal successors, (94), 78 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:47,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-14 03:32:47,883 INFO L93 Difference]: Finished difference Result 242 states and 262 transitions. [2024-11-14 03:32:47,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2024-11-14 03:32:47,883 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.205128205128205) internal successors, (94), 78 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 111 [2024-11-14 03:32:47,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-14 03:32:47,885 INFO L225 Difference]: With dead ends: 242 [2024-11-14 03:32:47,885 INFO L226 Difference]: Without dead ends: 117 [2024-11-14 03:32:47,886 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 379 GetRequests, 268 SyntacticMatches, 15 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3644 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1187, Invalid=8319, Unknown=0, NotChecked=0, Total=9506 [2024-11-14 03:32:47,886 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 99 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 470 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 470 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-14 03:32:47,887 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 39 Invalid, 1153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [470 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-14 03:32:47,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2024-11-14 03:32:48,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2024-11-14 03:32:48,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 116 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:48,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2024-11-14 03:32:48,132 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 111 [2024-11-14 03:32:48,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-14 03:32:48,133 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2024-11-14 03:32:48,133 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 1.205128205128205) internal successors, (94), 78 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-14 03:32:48,133 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2024-11-14 03:32:48,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2024-11-14 03:32:48,134 INFO L207 NwaCegarLoop]: Found error trace [2024-11-14 03:32:48,134 INFO L215 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-14 03:32:48,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2024-11-14 03:32:48,334 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_595956c8-c113-402c-a3f6-51f09c8fad93/bin/utaipan-verify-sOmjnqqW8E/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-14 03:32:48,334 INFO L396 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-14 03:32:48,334 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-14 03:32:48,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1424677960, now seen corresponding path program 42 times [2024-11-14 03:32:48,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-14 03:32:48,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389352830] [2024-11-14 03:32:48,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-14 03:32:48,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-14 03:32:49,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat