./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext-properties/list-ext_1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext-properties/list-ext_1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash e978ccdde62c7126e7c77a584896efdc6e7afe04b6752d127d7236cecdea192f --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:52:54,509 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:52:54,632 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-21 19:52:54,643 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:52:54,644 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:52:54,696 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:52:54,697 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:52:54,697 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:52:54,698 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:52:54,703 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:52:54,704 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:52:54,704 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:52:54,705 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:52:54,706 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:52:54,706 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:52:54,707 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:52:54,707 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:52:54,709 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:52:54,709 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:52:54,710 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:52:54,710 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:52:54,711 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:52:54,711 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 19:52:54,712 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 19:52:54,713 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:52:54,713 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:52:54,714 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:52:54,732 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:52:54,732 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:52:54,733 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-21 19:52:54,733 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-21 19:52:54,733 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-21 19:52:54,734 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:52:54,734 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-21 19:52:54,734 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 19:52:54,735 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:52:54,735 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:52:54,735 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:52:54,735 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:52:54,736 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:52:54,736 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:52:54,736 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:52:54,736 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:52:54,737 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:52:54,737 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:52:54,737 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:52:54,737 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:52:54,738 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:52:54,738 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e978ccdde62c7126e7c77a584896efdc6e7afe04b6752d127d7236cecdea192f [2023-11-21 19:52:55,023 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:52:55,055 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:52:55,058 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:52:55,059 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:52:55,060 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:52:55,061 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/list-ext-properties/list-ext_1.i [2023-11-21 19:52:58,220 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:52:58,581 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:52:58,582 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/sv-benchmarks/c/list-ext-properties/list-ext_1.i [2023-11-21 19:52:58,605 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/data/48ef30edf/701c7a5cb325471caf197fcdb225e452/FLAGc020a4173 [2023-11-21 19:52:58,624 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/data/48ef30edf/701c7a5cb325471caf197fcdb225e452 [2023-11-21 19:52:58,630 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:52:58,632 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:52:58,635 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:52:58,635 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:52:58,641 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:52:58,647 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:52:58" (1/1) ... [2023-11-21 19:52:58,648 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b3c7f08 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:58, skipping insertion in model container [2023-11-21 19:52:58,649 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:52:58" (1/1) ... [2023-11-21 19:52:58,695 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:52:59,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:52:59,095 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:52:59,175 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:52:59,214 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:52:59,215 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59 WrapperNode [2023-11-21 19:52:59,215 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:52:59,216 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:52:59,217 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:52:59,217 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:52:59,225 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,252 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,292 INFO L138 Inliner]: procedures = 124, calls = 30, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 132 [2023-11-21 19:52:59,292 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:52:59,293 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:52:59,293 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:52:59,294 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:52:59,304 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,304 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,323 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,324 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,332 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,341 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,349 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,357 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,362 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:52:59,363 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:52:59,363 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:52:59,363 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:52:59,364 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (1/1) ... [2023-11-21 19:52:59,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:52:59,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:59,401 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:52:59,436 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:52:59,488 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-21 19:52:59,488 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-21 19:52:59,488 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:52:59,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:52:59,489 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 19:52:59,489 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:52:59,490 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-21 19:52:59,491 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-21 19:52:59,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:52:59,492 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:52:59,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:52:59,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:52:59,682 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:52:59,685 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:52:59,735 INFO L774 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-21 19:53:00,144 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:53:00,226 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:53:00,226 INFO L308 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-21 19:53:00,228 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:53:00 BoogieIcfgContainer [2023-11-21 19:53:00,228 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:53:00,231 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:53:00,231 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:53:00,234 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:53:00,236 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:52:58" (1/3) ... [2023-11-21 19:53:00,237 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@360a3abb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:53:00, skipping insertion in model container [2023-11-21 19:53:00,238 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:52:59" (2/3) ... [2023-11-21 19:53:00,240 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@360a3abb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:53:00, skipping insertion in model container [2023-11-21 19:53:00,242 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:53:00" (3/3) ... [2023-11-21 19:53:00,243 INFO L112 eAbstractionObserver]: Analyzing ICFG list-ext_1.i [2023-11-21 19:53:00,259 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:53:00,259 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 38 error locations. [2023-11-21 19:53:00,307 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:53:00,315 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@5cfcfa3, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:53:00,315 INFO L358 AbstractCegarLoop]: Starting to check reachability of 38 error locations. [2023-11-21 19:53:00,319 INFO L276 IsEmpty]: Start isEmpty. Operand has 83 states, 41 states have (on average 2.292682926829268) internal successors, (94), 81 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:00,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-21 19:53:00,335 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:00,336 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-21 19:53:00,337 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:00,342 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:00,342 INFO L85 PathProgramCache]: Analyzing trace with hash -1906837973, now seen corresponding path program 1 times [2023-11-21 19:53:00,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:00,354 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648357365] [2023-11-21 19:53:00,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:00,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:00,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:00,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:00,519 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:00,520 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648357365] [2023-11-21 19:53:00,520 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648357365] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:00,521 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:00,521 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:53:00,523 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436237794] [2023-11-21 19:53:00,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:00,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-21 19:53:00,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:00,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-21 19:53:00,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 19:53:00,567 INFO L87 Difference]: Start difference. First operand has 83 states, 41 states have (on average 2.292682926829268) internal successors, (94), 81 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:00,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:00,618 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2023-11-21 19:53:00,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-21 19:53:00,620 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-21 19:53:00,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:00,628 INFO L225 Difference]: With dead ends: 82 [2023-11-21 19:53:00,628 INFO L226 Difference]: Without dead ends: 76 [2023-11-21 19:53:00,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-21 19:53:00,634 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:00,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:53:00,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-21 19:53:00,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-11-21 19:53:00,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 38 states have (on average 2.1052631578947367) internal successors, (80), 75 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:00,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2023-11-21 19:53:00,688 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 6 [2023-11-21 19:53:00,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:00,688 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2023-11-21 19:53:00,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:00,689 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2023-11-21 19:53:00,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-21 19:53:00,689 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:00,690 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-21 19:53:00,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:53:00,691 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:00,692 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:00,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1906689850, now seen corresponding path program 1 times [2023-11-21 19:53:00,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:00,694 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730828364] [2023-11-21 19:53:00,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:00,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:00,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:00,912 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:00,912 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:00,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730828364] [2023-11-21 19:53:00,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730828364] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:00,914 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:00,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:53:00,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003508114] [2023-11-21 19:53:00,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:00,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:53:00,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:00,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:53:00,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:53:00,919 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:01,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:01,143 INFO L93 Difference]: Finished difference Result 94 states and 101 transitions. [2023-11-21 19:53:01,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:53:01,144 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-21 19:53:01,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:01,145 INFO L225 Difference]: With dead ends: 94 [2023-11-21 19:53:01,146 INFO L226 Difference]: Without dead ends: 94 [2023-11-21 19:53:01,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:01,148 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 134 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:01,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 32 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:01,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-21 19:53:01,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 75. [2023-11-21 19:53:01,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 48 states have (on average 1.8125) internal successors, (87), 74 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) [2023-11-21 19:53:01,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2023-11-21 19:53:01,161 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 6 [2023-11-21 19:53:01,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:01,162 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2023-11-21 19:53:01,162 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:01,162 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2023-11-21 19:53:01,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-21 19:53:01,163 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:01,163 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-21 19:53:01,163 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:53:01,164 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:01,164 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:01,164 INFO L85 PathProgramCache]: Analyzing trace with hash -1906689849, now seen corresponding path program 1 times [2023-11-21 19:53:01,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:01,165 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886160077] [2023-11-21 19:53:01,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:01,165 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:01,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:01,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:01,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:01,412 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886160077] [2023-11-21 19:53:01,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886160077] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:01,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:01,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:53:01,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704338803] [2023-11-21 19:53:01,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:01,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:53:01,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:01,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:53:01,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:53:01,435 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:01,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:01,683 INFO L93 Difference]: Finished difference Result 105 states and 114 transitions. [2023-11-21 19:53:01,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:53:01,684 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-21 19:53:01,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:01,685 INFO L225 Difference]: With dead ends: 105 [2023-11-21 19:53:01,685 INFO L226 Difference]: Without dead ends: 105 [2023-11-21 19:53:01,686 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:01,687 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 138 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:01,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 40 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:01,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-11-21 19:53:01,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 92. [2023-11-21 19:53:01,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.5692307692307692) internal successors, (102), 91 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) [2023-11-21 19:53:01,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2023-11-21 19:53:01,698 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 6 [2023-11-21 19:53:01,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:01,699 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2023-11-21 19:53:01,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:01,699 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2023-11-21 19:53:01,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-21 19:53:01,700 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:01,700 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:01,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:53:01,701 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:01,701 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:01,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1444090260, now seen corresponding path program 1 times [2023-11-21 19:53:01,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:01,702 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312944410] [2023-11-21 19:53:01,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:01,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:01,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:01,946 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:01,947 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312944410] [2023-11-21 19:53:01,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312944410] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:01,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:01,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:53:01,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095319385] [2023-11-21 19:53:01,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:01,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:53:01,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:01,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:53:01,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:01,950 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:02,178 INFO L93 Difference]: Finished difference Result 125 states and 139 transitions. [2023-11-21 19:53:02,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:02,179 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-21 19:53:02,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:02,183 INFO L225 Difference]: With dead ends: 125 [2023-11-21 19:53:02,183 INFO L226 Difference]: Without dead ends: 125 [2023-11-21 19:53:02,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:53:02,185 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 93 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:02,186 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 101 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:02,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-21 19:53:02,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 89. [2023-11-21 19:53:02,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 65 states have (on average 1.523076923076923) internal successors, (99), 88 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 99 transitions. [2023-11-21 19:53:02,194 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 99 transitions. Word has length 12 [2023-11-21 19:53:02,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:02,194 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 99 transitions. [2023-11-21 19:53:02,194 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,194 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 99 transitions. [2023-11-21 19:53:02,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-21 19:53:02,195 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:02,195 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:02,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:53:02,196 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:02,196 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:02,196 INFO L85 PathProgramCache]: Analyzing trace with hash 1444090261, now seen corresponding path program 1 times [2023-11-21 19:53:02,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:02,197 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444550619] [2023-11-21 19:53:02,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:02,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:02,513 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:02,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:02,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444550619] [2023-11-21 19:53:02,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444550619] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:02,513 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:02,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:53:02,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1730894529] [2023-11-21 19:53:02,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:02,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:53:02,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:02,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:53:02,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:02,516 INFO L87 Difference]: Start difference. First operand 89 states and 99 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:02,845 INFO L93 Difference]: Finished difference Result 117 states and 132 transitions. [2023-11-21 19:53:02,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:02,846 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-21 19:53:02,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:02,847 INFO L225 Difference]: With dead ends: 117 [2023-11-21 19:53:02,848 INFO L226 Difference]: Without dead ends: 117 [2023-11-21 19:53:02,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:53:02,851 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 51 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:02,852 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 145 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:53:02,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-21 19:53:02,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 67. [2023-11-21 19:53:02,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 51 states have (on average 1.4705882352941178) internal successors, (75), 66 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2023-11-21 19:53:02,897 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 12 [2023-11-21 19:53:02,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:02,898 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2023-11-21 19:53:02,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:02,899 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2023-11-21 19:53:02,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-21 19:53:02,900 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:02,900 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:02,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:53:02,901 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:02,901 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:02,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1718731934, now seen corresponding path program 1 times [2023-11-21 19:53:02,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:02,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849906510] [2023-11-21 19:53:02,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:02,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:02,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:03,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:03,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:03,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849906510] [2023-11-21 19:53:03,093 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849906510] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:03,093 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:03,093 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:53:03,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579978310] [2023-11-21 19:53:03,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:03,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:53:03,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:03,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:53:03,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:53:03,100 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:03,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:03,318 INFO L93 Difference]: Finished difference Result 118 states and 128 transitions. [2023-11-21 19:53:03,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:03,319 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 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 13 [2023-11-21 19:53:03,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:03,320 INFO L225 Difference]: With dead ends: 118 [2023-11-21 19:53:03,320 INFO L226 Difference]: Without dead ends: 118 [2023-11-21 19:53:03,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:53:03,321 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 53 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:03,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 116 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:03,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2023-11-21 19:53:03,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 75. [2023-11-21 19:53:03,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 59 states have (on average 1.4406779661016949) internal successors, (85), 74 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:03,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 85 transitions. [2023-11-21 19:53:03,326 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 85 transitions. Word has length 13 [2023-11-21 19:53:03,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:03,327 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 85 transitions. [2023-11-21 19:53:03,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:03,327 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 85 transitions. [2023-11-21 19:53:03,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:53:03,329 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:03,330 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:03,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-21 19:53:03,330 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:03,330 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:03,331 INFO L85 PathProgramCache]: Analyzing trace with hash -1865370342, now seen corresponding path program 1 times [2023-11-21 19:53:03,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:03,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738557569] [2023-11-21 19:53:03,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:03,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:03,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:03,548 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:03,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:03,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738557569] [2023-11-21 19:53:03,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738557569] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:03,549 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:03,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:53:03,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532931690] [2023-11-21 19:53:03,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:03,549 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:53:03,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:03,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:53:03,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:53:03,551 INFO L87 Difference]: Start difference. First operand 75 states and 85 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:03,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:03,721 INFO L93 Difference]: Finished difference Result 117 states and 126 transitions. [2023-11-21 19:53:03,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:03,722 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-21 19:53:03,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:03,723 INFO L225 Difference]: With dead ends: 117 [2023-11-21 19:53:03,723 INFO L226 Difference]: Without dead ends: 117 [2023-11-21 19:53:03,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:53:03,727 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 92 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:03,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 93 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:53:03,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2023-11-21 19:53:03,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 77. [2023-11-21 19:53:03,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 61 states have (on average 1.4262295081967213) 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) [2023-11-21 19:53:03,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2023-11-21 19:53:03,740 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 15 [2023-11-21 19:53:03,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:03,740 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2023-11-21 19:53:03,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:03,741 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2023-11-21 19:53:03,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 19:53:03,741 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:03,742 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:03,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-21 19:53:03,743 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:03,744 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:03,744 INFO L85 PathProgramCache]: Analyzing trace with hash -1623238166, now seen corresponding path program 1 times [2023-11-21 19:53:03,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:03,744 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269063087] [2023-11-21 19:53:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:03,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:03,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:03,970 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:03,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:03,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269063087] [2023-11-21 19:53:03,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269063087] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:03,970 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:03,971 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:53:03,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768879765] [2023-11-21 19:53:03,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:03,971 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:53:03,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:03,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:53:03,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:53:03,972 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:04,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:04,179 INFO L93 Difference]: Finished difference Result 114 states and 123 transitions. [2023-11-21 19:53:04,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:04,180 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 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 17 [2023-11-21 19:53:04,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:04,181 INFO L225 Difference]: With dead ends: 114 [2023-11-21 19:53:04,181 INFO L226 Difference]: Without dead ends: 114 [2023-11-21 19:53:04,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:53:04,184 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 81 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:04,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 101 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:04,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-11-21 19:53:04,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 79. [2023-11-21 19:53:04,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 63 states have (on average 1.4126984126984128) internal successors, (89), 78 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:04,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2023-11-21 19:53:04,191 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 17 [2023-11-21 19:53:04,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:04,191 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2023-11-21 19:53:04,193 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:04,194 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2023-11-21 19:53:04,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:53:04,197 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:04,198 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:04,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 19:53:04,199 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:04,200 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:04,200 INFO L85 PathProgramCache]: Analyzing trace with hash 141984051, now seen corresponding path program 1 times [2023-11-21 19:53:04,200 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:04,201 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084138340] [2023-11-21 19:53:04,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:04,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:04,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:04,616 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:04,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:04,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084138340] [2023-11-21 19:53:04,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084138340] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:04,620 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760668451] [2023-11-21 19:53:04,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:04,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:04,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:04,628 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:04,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:53:04,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:04,767 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-21 19:53:04,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:04,870 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 11 treesize of output 7 [2023-11-21 19:53:04,889 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:53:04,889 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 19:53:04,940 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-21 19:53:04,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:53:04,964 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2023-11-21 19:53:04,981 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2023-11-21 19:53:05,023 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:05,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:05,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:05,053 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:05,111 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_143 (Array Int Int))) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_143) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) is different from false [2023-11-21 19:53:05,165 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_143 (Array Int Int))) (not (= (select (select (store |c_#memory_int| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base|) (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4)) v_ArrVal_143) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) is different from false [2023-11-21 19:53:05,229 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:05,230 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 30 [2023-11-21 19:53:05,250 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-11-21 19:53:05,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 32 [2023-11-21 19:53:05,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 18 [2023-11-21 19:53:05,280 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-21 19:53:05,284 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-21 19:53:05,323 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 19:53:05,323 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [760668451] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:05,324 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972090266] [2023-11-21 19:53:05,345 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-21 19:53:05,346 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:05,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:05,358 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:05,358 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:07,625 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:53:09,431 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1771#(and (= |ULTIMATE.start_main_~y~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_main_~p~0#1.base|) 1)) (or (and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_55| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_56| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.offset_86| Int) (|v_#memory_int_49| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_57| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_56| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.base_105| Int)) (and (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_105|) 1) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_86| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_105|)) (= |v_#memory_$Pointer$.offset_56| (store |v_#memory_$Pointer$.offset_55| |v_ULTIMATE.start_main_~p~0#1.base_105| (store (select |v_#memory_$Pointer$.offset_55| |v_ULTIMATE.start_main_~p~0#1.base_105|) |v_ULTIMATE.start_main_~p~0#1.offset_86| (select (select |v_#memory_$Pointer$.offset_56| |v_ULTIMATE.start_main_~p~0#1.base_105|) |v_ULTIMATE.start_main_~p~0#1.offset_86|)))) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_86|) (= (store |v_#memory_$Pointer$.base_57| |v_ULTIMATE.start_main_~p~0#1.base_105| (store (select |v_#memory_$Pointer$.base_57| |v_ULTIMATE.start_main_~p~0#1.base_105|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_86| 4) 0)) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_49| |v_ULTIMATE.start_main_~p~0#1.base_105| (store (store (select |v_#memory_int_49| |v_ULTIMATE.start_main_~p~0#1.base_105|) |v_ULTIMATE.start_main_~p~0#1.offset_86| 3) (+ |v_ULTIMATE.start_main_~p~0#1.offset_86| 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_105|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_86| 4))))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_56| |v_ULTIMATE.start_main_~p~0#1.base_105| (store (select |v_#memory_$Pointer$.offset_56| |v_ULTIMATE.start_main_~p~0#1.base_105|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_86| 4) 0))) (= (store |v_#memory_$Pointer$.base_56| |v_ULTIMATE.start_main_~p~0#1.base_105| (store (select |v_#memory_$Pointer$.base_56| |v_ULTIMATE.start_main_~p~0#1.base_105|) |v_ULTIMATE.start_main_~p~0#1.offset_86| (select (select |v_#memory_$Pointer$.base_57| |v_ULTIMATE.start_main_~p~0#1.base_105|) |v_ULTIMATE.start_main_~p~0#1.offset_86|))) |v_#memory_$Pointer$.base_57|)))) (exists ((|v_ULTIMATE.start_main_~p~0#1.base_109| Int) (|v_ULTIMATE.start_main_~p~0#1.offset_90| Int)) (and (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_90| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_109|)) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_109|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_90| 4)) |ULTIMATE.start_main_~p~0#1.base|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_109|) 1) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_90|) (= |ULTIMATE.start_main_~p~0#1.offset| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_109|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_90| 4)))))))' at error location [2023-11-21 19:53:09,431 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:53:09,431 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:53:09,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-11-21 19:53:09,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59107481] [2023-11-21 19:53:09,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:53:09,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:53:09,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:09,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:53:09,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=485, Unknown=2, NotChecked=90, Total=650 [2023-11-21 19:53:09,434 INFO L87 Difference]: Start difference. First operand 79 states and 89 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) [2023-11-21 19:53:10,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:10,080 INFO L93 Difference]: Finished difference Result 146 states and 157 transitions. [2023-11-21 19:53:10,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:53:10,081 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 19 [2023-11-21 19:53:10,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:10,083 INFO L225 Difference]: With dead ends: 146 [2023-11-21 19:53:10,083 INFO L226 Difference]: Without dead ends: 146 [2023-11-21 19:53:10,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=130, Invalid=868, Unknown=2, NotChecked=122, Total=1122 [2023-11-21 19:53:10,085 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 140 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 271 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:10,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 224 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 387 Invalid, 0 Unknown, 271 Unchecked, 0.4s Time] [2023-11-21 19:53:10,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-21 19:53:10,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 89. [2023-11-21 19:53:10,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 73 states have (on average 1.36986301369863) internal successors, (100), 88 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:10,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 100 transitions. [2023-11-21 19:53:10,091 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 100 transitions. Word has length 19 [2023-11-21 19:53:10,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:10,091 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 100 transitions. [2023-11-21 19:53:10,092 INFO L496 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) [2023-11-21 19:53:10,092 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 100 transitions. [2023-11-21 19:53:10,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:53:10,096 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:10,097 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:10,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:53:10,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-21 19:53:10,311 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:10,311 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:10,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1798830064, now seen corresponding path program 1 times [2023-11-21 19:53:10,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:10,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026785245] [2023-11-21 19:53:10,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:10,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:10,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:10,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:10,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:10,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026785245] [2023-11-21 19:53:10,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026785245] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:10,840 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091278895] [2023-11-21 19:53:10,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:10,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:10,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:10,846 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:10,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:53:10,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:10,955 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-21 19:53:10,958 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:11,002 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-21 19:53:11,003 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-11-21 19:53:11,059 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-21 19:53:11,174 INFO L349 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2023-11-21 19:53:11,174 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2023-11-21 19:53:11,199 INFO L349 Elim1Store]: treesize reduction 21, result has 19.2 percent of original size [2023-11-21 19:53:11,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 41 [2023-11-21 19:53:11,244 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2023-11-21 19:53:11,271 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:11,272 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:11,341 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_203 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base|) (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4)) v_ArrVal_203) |c_ULTIMATE.start_main_~a~0#1.base|) (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) 1)) is different from false [2023-11-21 19:53:11,348 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:11,349 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 25 [2023-11-21 19:53:11,358 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:11,359 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2023-11-21 19:53:11,362 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2023-11-21 19:53:11,552 INFO L349 Elim1Store]: treesize reduction 5, result has 93.8 percent of original size [2023-11-21 19:53:11,553 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 70 treesize of output 135 [2023-11-21 19:53:11,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:11,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091278895] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:11,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691080367] [2023-11-21 19:53:11,774 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-21 19:53:11,774 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:11,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:11,774 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:11,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:17,948 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:53:20,111 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2163#(and (= |ULTIMATE.start_main_~y~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_main_~p~0#1.base|) 1)) (or (and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (exists ((|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_#t~nondet9#1_32| Int) (|v_ULTIMATE.start_main_#t~nondet9#1_31| Int) (|v_ULTIMATE.start_main_~y~0#1_31| Int)) (and (or (and (<= 10 |v_ULTIMATE.start_main_~y~0#1_31|) (not |v_ULTIMATE.start_main_#t~short10#1_16|)) (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= |v_ULTIMATE.start_main_~y~0#1_31| 9))) (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (= |v_ULTIMATE.start_main_#t~nondet9#1_32| 0)) (and (= |v_ULTIMATE.start_main_#t~nondet9#1_32| |v_ULTIMATE.start_main_#t~nondet9#1_31|) (not |v_ULTIMATE.start_main_#t~short10#1_16|))))) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (exists ((|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_68| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.base_120| Int) (|v_ULTIMATE.start_main_~p~0#1.offset_98| Int) (|v_#memory_int_61| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_main_~p~0#1.base_120| (store (select |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_main_~p~0#1.base_120|) |v_ULTIMATE.start_main_~p~0#1.offset_98| (select (select |v_#memory_$Pointer$.offset_68| |v_ULTIMATE.start_main_~p~0#1.base_120|) |v_ULTIMATE.start_main_~p~0#1.offset_98|))) |v_#memory_$Pointer$.offset_68|) (= |#memory_int| (store |v_#memory_int_61| |v_ULTIMATE.start_main_~p~0#1.base_120| (store (store (select |v_#memory_int_61| |v_ULTIMATE.start_main_~p~0#1.base_120|) |v_ULTIMATE.start_main_~p~0#1.offset_98| 3) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_120|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4))))) (<= (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 8) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_120|)) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_120|) 1) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_98|) (= (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_main_~p~0#1.base_120| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_main_~p~0#1.base_120|) |v_ULTIMATE.start_main_~p~0#1.offset_98| (select (select |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_main_~p~0#1.base_120|) |v_ULTIMATE.start_main_~p~0#1.offset_98|))) |v_#memory_$Pointer$.base_72|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_68| |v_ULTIMATE.start_main_~p~0#1.base_120| (store (select |v_#memory_$Pointer$.offset_68| |v_ULTIMATE.start_main_~p~0#1.base_120|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4) 0))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_main_~p~0#1.base_120| (store (select |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_main_~p~0#1.base_120|) (+ |v_ULTIMATE.start_main_~p~0#1.offset_98| 4) 0)))))) (exists ((|v_ULTIMATE.start_main_~p~0#1.offset_102| Int) (|v_ULTIMATE.start_main_~p~0#1.base_124| Int)) (and (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_102|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_124|)) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= 1 (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_124|)) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_102|) (= |ULTIMATE.start_main_~p~0#1.offset| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_124|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_102|))) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_124|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_102|)) |ULTIMATE.start_main_~p~0#1.base|)))))' at error location [2023-11-21 19:53:20,111 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:53:20,111 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:53:20,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2023-11-21 19:53:20,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6274498] [2023-11-21 19:53:20,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:53:20,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-21 19:53:20,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:20,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-21 19:53:20,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=723, Unknown=3, NotChecked=54, Total=870 [2023-11-21 19:53:20,114 INFO L87 Difference]: Start difference. First operand 89 states and 100 transitions. Second operand has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 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) [2023-11-21 19:53:21,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:21,476 INFO L93 Difference]: Finished difference Result 179 states and 196 transitions. [2023-11-21 19:53:21,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:53:21,477 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 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) Word has length 19 [2023-11-21 19:53:21,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:21,479 INFO L225 Difference]: With dead ends: 179 [2023-11-21 19:53:21,479 INFO L226 Difference]: Without dead ends: 179 [2023-11-21 19:53:21,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=162, Invalid=1099, Unknown=3, NotChecked=68, Total=1332 [2023-11-21 19:53:21,480 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 394 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 721 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 394 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 976 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 180 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:21,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [394 Valid, 301 Invalid, 976 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 721 Invalid, 0 Unknown, 180 Unchecked, 0.9s Time] [2023-11-21 19:53:21,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-11-21 19:53:21,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 120. [2023-11-21 19:53:21,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 104 states have (on average 1.3846153846153846) internal successors, (144), 119 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:21,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 144 transitions. [2023-11-21 19:53:21,486 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 144 transitions. Word has length 19 [2023-11-21 19:53:21,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:21,487 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 144 transitions. [2023-11-21 19:53:21,487 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 2.8333333333333335) internal successors, (51), 19 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) [2023-11-21 19:53:21,487 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 144 transitions. [2023-11-21 19:53:21,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:53:21,488 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:21,488 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:21,522 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:53:21,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:53:21,708 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:21,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:21,710 INFO L85 PathProgramCache]: Analyzing trace with hash -1798830063, now seen corresponding path program 1 times [2023-11-21 19:53:21,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:21,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949395053] [2023-11-21 19:53:21,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:21,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:21,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:22,391 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:22,391 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:22,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949395053] [2023-11-21 19:53:22,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949395053] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:22,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646519184] [2023-11-21 19:53:22,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:22,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:22,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:22,393 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:22,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:53:22,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:22,508 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-21 19:53:22,516 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:22,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 8 treesize of output 1 [2023-11-21 19:53:22,574 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:53:22,575 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 19:53:22,641 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-21 19:53:22,651 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 13 treesize of output 9 [2023-11-21 19:53:22,787 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 19:53:22,787 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 17 [2023-11-21 19:53:22,794 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-21 19:53:22,813 INFO L349 Elim1Store]: treesize reduction 17, result has 22.7 percent of original size [2023-11-21 19:53:22,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 30 [2023-11-21 19:53:22,863 INFO L349 Elim1Store]: treesize reduction 21, result has 19.2 percent of original size [2023-11-21 19:53:22,865 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 57 [2023-11-21 19:53:22,877 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 13 [2023-11-21 19:53:22,933 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 13 [2023-11-21 19:53:22,937 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 3 [2023-11-21 19:53:22,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:22,956 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:23,047 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (and (forall ((v_ArrVal_266 (Array Int Int))) (<= 0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_266) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0))) (forall ((v_ArrVal_265 (Array Int Int)) (v_ArrVal_266 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_266) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0) 4) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_265) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0)))))) is different from false [2023-11-21 19:53:23,174 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:23,174 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 46 [2023-11-21 19:53:23,182 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:23,183 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 36 [2023-11-21 19:53:23,196 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:23,197 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 61 [2023-11-21 19:53:23,218 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:23,218 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 96 treesize of output 89 [2023-11-21 19:53:23,226 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2023-11-21 19:53:23,229 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:53:23,267 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:23,267 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 23 [2023-11-21 19:53:23,270 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-21 19:53:23,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:53:23,278 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 10 [2023-11-21 19:53:23,362 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-21 19:53:23,362 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-21 19:53:23,382 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 19:53:23,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1646519184] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:23,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104798656] [2023-11-21 19:53:23,385 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-21 19:53:23,385 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:23,386 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:23,386 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:23,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:27,730 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:53:29,839 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2616#(and (or (exists ((|v_ULTIMATE.start_main_~p~0#1.base_140| Int) (|v_ULTIMATE.start_main_~p~0#1.offset_116| Int)) (and (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_140|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_116|)) |ULTIMATE.start_main_~p~0#1.base|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_116|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_140|)) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_116|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_140|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_116|)) |ULTIMATE.start_main_~p~0#1.offset|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_140|) 1))) (and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_86| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_85| (Array Int (Array Int Int))) (|v_#memory_int_76| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.offset_112| Int) (|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.base_136| Int) (|v_#memory_$Pointer$.base_89| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.offset_85| |v_ULTIMATE.start_main_~p~0#1.base_136| (store (select |v_#memory_$Pointer$.offset_85| |v_ULTIMATE.start_main_~p~0#1.base_136|) |v_ULTIMATE.start_main_~p~0#1.offset_112| (select (select |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_main_~p~0#1.base_136|) |v_ULTIMATE.start_main_~p~0#1.offset_112|))) |v_#memory_$Pointer$.offset_86|) (= (store |v_#memory_$Pointer$.base_89| |v_ULTIMATE.start_main_~p~0#1.base_136| (store (select |v_#memory_$Pointer$.base_89| |v_ULTIMATE.start_main_~p~0#1.base_136|) |v_ULTIMATE.start_main_~p~0#1.offset_112| (select (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_main_~p~0#1.base_136|) |v_ULTIMATE.start_main_~p~0#1.offset_112|))) |v_#memory_$Pointer$.base_90|) (= (store |v_#memory_int_76| |v_ULTIMATE.start_main_~p~0#1.base_136| (store (store (select |v_#memory_int_76| |v_ULTIMATE.start_main_~p~0#1.base_136|) |v_ULTIMATE.start_main_~p~0#1.offset_112| 3) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_136|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|)))) |#memory_int|) (= 1 (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_136|)) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_main_~p~0#1.base_136| (store (select |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_main_~p~0#1.base_136|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|) 0))) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_112|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_136|)) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_112|) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_main_~p~0#1.base_136| (store (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_main_~p~0#1.base_136|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_112|) 0))))) (exists ((|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_~y~0#1_33| Int) (|v_ULTIMATE.start_main_#t~nondet9#1_36| Int) (|v_ULTIMATE.start_main_#t~nondet9#1_35| Int)) (and (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= |v_ULTIMATE.start_main_~y~0#1_33| 9)) (and (<= 10 |v_ULTIMATE.start_main_~y~0#1_33|) (not |v_ULTIMATE.start_main_#t~short10#1_16|))) (or (and (= |v_ULTIMATE.start_main_#t~nondet9#1_36| 0) |v_ULTIMATE.start_main_#t~short10#1_16|) (and (not |v_ULTIMATE.start_main_#t~short10#1_16|) (= |v_ULTIMATE.start_main_#t~nondet9#1_36| |v_ULTIMATE.start_main_#t~nondet9#1_35|))))))) (= |ULTIMATE.start_main_~y~0#1| 0) (or (< |ULTIMATE.start_main_~p~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_main_~p~0#1.base|) (+ |ULTIMATE.start_main_~p~0#1.offset| 4))))' at error location [2023-11-21 19:53:29,839 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:53:29,839 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:53:29,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 19 [2023-11-21 19:53:29,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007561026] [2023-11-21 19:53:29,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:53:29,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-21 19:53:29,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:29,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-21 19:53:29,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=835, Unknown=4, NotChecked=58, Total=992 [2023-11-21 19:53:29,842 INFO L87 Difference]: Start difference. First operand 120 states and 144 transitions. Second operand has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 20 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) [2023-11-21 19:53:31,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:31,148 INFO L93 Difference]: Finished difference Result 173 states and 188 transitions. [2023-11-21 19:53:31,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-21 19:53:31,149 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 20 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) Word has length 19 [2023-11-21 19:53:31,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:31,150 INFO L225 Difference]: With dead ends: 173 [2023-11-21 19:53:31,150 INFO L226 Difference]: Without dead ends: 173 [2023-11-21 19:53:31,152 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=231, Invalid=1571, Unknown=8, NotChecked=82, Total=1892 [2023-11-21 19:53:31,152 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 359 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:31,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [359 Valid, 257 Invalid, 838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 583 Invalid, 0 Unknown, 168 Unchecked, 0.6s Time] [2023-11-21 19:53:31,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2023-11-21 19:53:31,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 116. [2023-11-21 19:53:31,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 101 states have (on average 1.3366336633663367) internal successors, (135), 115 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 135 transitions. [2023-11-21 19:53:31,158 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 135 transitions. Word has length 19 [2023-11-21 19:53:31,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:31,158 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 135 transitions. [2023-11-21 19:53:31,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 2.736842105263158) internal successors, (52), 20 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) [2023-11-21 19:53:31,159 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 135 transitions. [2023-11-21 19:53:31,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:53:31,159 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:31,159 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:31,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-21 19:53:31,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-21 19:53:31,373 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr35ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:31,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:31,373 INFO L85 PathProgramCache]: Analyzing trace with hash 2077258470, now seen corresponding path program 1 times [2023-11-21 19:53:31,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:31,373 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784404312] [2023-11-21 19:53:31,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:31,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:31,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:31,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:31,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:31,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784404312] [2023-11-21 19:53:31,448 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784404312] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:31,449 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:31,449 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:53:31,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653202569] [2023-11-21 19:53:31,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:31,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:53:31,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:31,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:53:31,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:53:31,451 INFO L87 Difference]: Start difference. First operand 116 states and 135 transitions. Second operand has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:31,551 INFO L93 Difference]: Finished difference Result 134 states and 154 transitions. [2023-11-21 19:53:31,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:53:31,552 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 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 20 [2023-11-21 19:53:31,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:31,553 INFO L225 Difference]: With dead ends: 134 [2023-11-21 19:53:31,553 INFO L226 Difference]: Without dead ends: 134 [2023-11-21 19:53:31,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:31,553 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 99 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:31,554 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:53:31,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-11-21 19:53:31,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 123. [2023-11-21 19:53:31,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 108 states have (on average 1.3148148148148149) internal successors, (142), 122 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 142 transitions. [2023-11-21 19:53:31,558 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 142 transitions. Word has length 20 [2023-11-21 19:53:31,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:31,558 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 142 transitions. [2023-11-21 19:53:31,558 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 6.666666666666667) internal successors, (20), 3 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,558 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 142 transitions. [2023-11-21 19:53:31,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:53:31,559 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:31,559 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:31,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 19:53:31,559 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr37ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:31,559 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:31,559 INFO L85 PathProgramCache]: Analyzing trace with hash -914396119, now seen corresponding path program 1 times [2023-11-21 19:53:31,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:31,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708130481] [2023-11-21 19:53:31,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:31,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:31,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:31,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:31,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:31,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708130481] [2023-11-21 19:53:31,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708130481] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:31,679 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:31,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:53:31,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232258424] [2023-11-21 19:53:31,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:31,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:53:31,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:31,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:53:31,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:53:31,684 INFO L87 Difference]: Start difference. First operand 123 states and 142 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:31,845 INFO L93 Difference]: Finished difference Result 150 states and 170 transitions. [2023-11-21 19:53:31,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:31,846 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 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 22 [2023-11-21 19:53:31,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:31,847 INFO L225 Difference]: With dead ends: 150 [2023-11-21 19:53:31,847 INFO L226 Difference]: Without dead ends: 146 [2023-11-21 19:53:31,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:53:31,848 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 58 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:31,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 113 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:53:31,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-21 19:53:31,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 126. [2023-11-21 19:53:31,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 111 states have (on average 1.3063063063063063) internal successors, (145), 125 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) [2023-11-21 19:53:31,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 145 transitions. [2023-11-21 19:53:31,853 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 145 transitions. Word has length 22 [2023-11-21 19:53:31,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:31,854 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 145 transitions. [2023-11-21 19:53:31,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 4 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 145 transitions. [2023-11-21 19:53:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:53:31,855 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:31,855 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:31,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-21 19:53:31,856 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:31,856 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:31,856 INFO L85 PathProgramCache]: Analyzing trace with hash -639405002, now seen corresponding path program 2 times [2023-11-21 19:53:31,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:31,857 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435058703] [2023-11-21 19:53:31,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:31,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:31,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:32,436 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:32,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:32,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435058703] [2023-11-21 19:53:32,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435058703] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:32,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [807613348] [2023-11-21 19:53:32,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:53:32,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:32,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:32,439 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:32,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:53:32,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:53:32,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:53:32,591 INFO L262 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 39 conjunts are in the unsatisfiable core [2023-11-21 19:53:32,596 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:32,600 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-11-21 19:53:32,673 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:53:32,673 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 19:53:32,697 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 [2023-11-21 19:53:32,704 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 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 [2023-11-21 19:53:32,796 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:32,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:53:32,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:32,847 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-21 19:53:32,847 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 84 [2023-11-21 19:53:32,855 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 54 [2023-11-21 19:53:32,860 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 19 [2023-11-21 19:53:32,910 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 19 [2023-11-21 19:53:32,914 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-21 19:53:32,922 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:32,923 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:32,994 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_359 (Array Int Int)) (v_ArrVal_360 (Array Int Int)) (v_ArrVal_358 Int)) (not (= 1 (let ((.cse0 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~p~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~p~0#1.base|) (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4) v_ArrVal_358)) (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_360) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0)) (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_359) |c_ULTIMATE.start_main_~a~0#1.base|) .cse0)))))) is different from false [2023-11-21 19:53:33,003 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 400 treesize of output 356 [2023-11-21 19:53:33,229 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse5 (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4))) (let ((.cse4 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~p~0#1.base|) .cse5))) (let ((.cse2 (+ .cse4 4)) (.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base|) .cse5)) (.cse1 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (and (or (forall ((v_ArrVal_360 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_360) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1) .cse0))) (forall ((v_ArrVal_359 (Array Int Int))) (not (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_359) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1) .cse2)))) (forall ((v_ArrVal_360 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_360) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1) .cse0)) (forall ((v_ArrVal_359 (Array Int Int))) (let ((.cse3 (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_359) |c_ULTIMATE.start_main_~a~0#1.base|) .cse1))) (or (= .cse3 .cse2) (= .cse3 .cse4)))))))) is different from false [2023-11-21 19:53:33,245 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:33,245 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 26 [2023-11-21 19:53:33,255 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:33,255 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 38 [2023-11-21 19:53:33,259 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2023-11-21 19:53:33,279 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:33,280 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2023-11-21 19:53:33,295 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:33,295 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 38 [2023-11-21 19:53:33,300 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 18 [2023-11-21 19:53:33,316 INFO L349 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2023-11-21 19:53:33,316 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 1 [2023-11-21 19:53:33,336 INFO L349 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2023-11-21 19:53:33,336 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 1 [2023-11-21 19:53:33,460 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:33,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [807613348] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:33,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691839216] [2023-11-21 19:53:33,465 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-21 19:53:33,465 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:33,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:33,466 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:33,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:35,360 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:53:37,531 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3639#(and (or (exists ((|v_ULTIMATE.start_main_~p~0#1.offset_133| Int) (|v_ULTIMATE.start_main_~p~0#1.base_157| Int)) (and (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_133|) (<= 0 |ULTIMATE.start_main_~a~0#1.offset|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_157|) 1) (<= 1 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_main_~p~0#1.base_157|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_133|)) |ULTIMATE.start_main_~p~0#1.base|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_133|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_157|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_main_~p~0#1.base_157|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_133|)) |ULTIMATE.start_main_~p~0#1.offset|))) (and (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start_main_~a~0#1.offset| |ULTIMATE.start_main_~p~0#1.offset|) (exists ((|v_ULTIMATE.start_main_#t~nondet9#1_40| Int) (|v_ULTIMATE.start_main_~y~0#1_35| Int) (|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_#t~nondet9#1_39| Int)) (and (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (= |v_ULTIMATE.start_main_#t~nondet9#1_40| 0)) (and (not |v_ULTIMATE.start_main_#t~short10#1_16|) (= |v_ULTIMATE.start_main_#t~nondet9#1_40| |v_ULTIMATE.start_main_#t~nondet9#1_39|))) (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= |v_ULTIMATE.start_main_~y~0#1_35| 9)) (and (<= 10 |v_ULTIMATE.start_main_~y~0#1_35|) (not |v_ULTIMATE.start_main_#t~short10#1_16|))))) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_104| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_108| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_107| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.offset_129| Int) (|v_ULTIMATE.start_main_~p~0#1.base_153| Int) (|v_#memory_int_93| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_103| (Array Int (Array Int Int)))) (and (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_129|) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_129|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_153|)) (= |v_#memory_$Pointer$.base_108| (store |v_#memory_$Pointer$.base_107| |v_ULTIMATE.start_main_~p~0#1.base_153| (store (select |v_#memory_$Pointer$.base_107| |v_ULTIMATE.start_main_~p~0#1.base_153|) |v_ULTIMATE.start_main_~p~0#1.offset_129| (select (select |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_main_~p~0#1.base_153|) |v_ULTIMATE.start_main_~p~0#1.offset_129|)))) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_153|) 1) (= (store |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_main_~p~0#1.base_153| (store (select |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_main_~p~0#1.base_153|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_129|) 0)) |#memory_$Pointer$.base|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_104| |v_ULTIMATE.start_main_~p~0#1.base_153| (store (select |v_#memory_$Pointer$.offset_104| |v_ULTIMATE.start_main_~p~0#1.base_153|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_129|) 0))) (= |#memory_int| (store |v_#memory_int_93| |v_ULTIMATE.start_main_~p~0#1.base_153| (store (store (select |v_#memory_int_93| |v_ULTIMATE.start_main_~p~0#1.base_153|) |v_ULTIMATE.start_main_~p~0#1.offset_129| 3) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_129|) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_153|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_129|))))) (= |v_#memory_$Pointer$.offset_104| (store |v_#memory_$Pointer$.offset_103| |v_ULTIMATE.start_main_~p~0#1.base_153| (store (select |v_#memory_$Pointer$.offset_103| |v_ULTIMATE.start_main_~p~0#1.base_153|) |v_ULTIMATE.start_main_~p~0#1.offset_129| (select (select |v_#memory_$Pointer$.offset_104| |v_ULTIMATE.start_main_~p~0#1.base_153|) |v_ULTIMATE.start_main_~p~0#1.offset_129|)))))))) (= |ULTIMATE.start_main_~y~0#1| 0) (not (= (select |#valid| |ULTIMATE.start_main_~p~0#1.base|) 1)))' at error location [2023-11-21 19:53:37,531 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:53:37,531 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:53:37,532 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2023-11-21 19:53:37,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833859835] [2023-11-21 19:53:37,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:53:37,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-21 19:53:37,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:37,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-21 19:53:37,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=841, Unknown=6, NotChecked=118, Total=1056 [2023-11-21 19:53:37,533 INFO L87 Difference]: Start difference. First operand 126 states and 145 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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) [2023-11-21 19:53:38,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:38,712 INFO L93 Difference]: Finished difference Result 161 states and 177 transitions. [2023-11-21 19:53:38,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-21 19:53:38,712 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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) Word has length 22 [2023-11-21 19:53:38,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:38,713 INFO L225 Difference]: With dead ends: 161 [2023-11-21 19:53:38,713 INFO L226 Difference]: Without dead ends: 161 [2023-11-21 19:53:38,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=246, Invalid=1826, Unknown=6, NotChecked=178, Total=2256 [2023-11-21 19:53:38,715 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 299 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 318 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:38,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 285 Invalid, 935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 562 Invalid, 0 Unknown, 318 Unchecked, 0.5s Time] [2023-11-21 19:53:38,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2023-11-21 19:53:38,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 126. [2023-11-21 19:53:38,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 111 states have (on average 1.2972972972972974) internal successors, (144), 125 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:38,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 144 transitions. [2023-11-21 19:53:38,720 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 144 transitions. Word has length 22 [2023-11-21 19:53:38,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:38,720 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 144 transitions. [2023-11-21 19:53:38,721 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 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) [2023-11-21 19:53:38,721 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 144 transitions. [2023-11-21 19:53:38,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:53:38,722 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:38,722 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:38,740 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:53:38,928 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-21 19:53:38,928 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:38,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:38,929 INFO L85 PathProgramCache]: Analyzing trace with hash 1797575736, now seen corresponding path program 1 times [2023-11-21 19:53:38,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:38,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953749567] [2023-11-21 19:53:38,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:38,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:38,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:39,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:39,219 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:39,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953749567] [2023-11-21 19:53:39,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953749567] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:53:39,220 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:53:39,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:53:39,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61525522] [2023-11-21 19:53:39,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:53:39,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:53:39,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:39,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:53:39,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:53:39,222 INFO L87 Difference]: Start difference. First operand 126 states and 144 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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) [2023-11-21 19:53:39,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:39,449 INFO L93 Difference]: Finished difference Result 140 states and 157 transitions. [2023-11-21 19:53:39,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:53:39,449 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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 23 [2023-11-21 19:53:39,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:39,450 INFO L225 Difference]: With dead ends: 140 [2023-11-21 19:53:39,450 INFO L226 Difference]: Without dead ends: 129 [2023-11-21 19:53:39,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:53:39,451 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 134 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 173 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:39,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 109 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 173 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:53:39,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-21 19:53:39,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 115. [2023-11-21 19:53:39,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 100 states have (on average 1.32) internal successors, (132), 114 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:39,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 132 transitions. [2023-11-21 19:53:39,455 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 132 transitions. Word has length 23 [2023-11-21 19:53:39,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:39,455 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 132 transitions. [2023-11-21 19:53:39,455 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 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) [2023-11-21 19:53:39,456 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 132 transitions. [2023-11-21 19:53:39,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:53:39,461 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:39,461 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:39,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-21 19:53:39,462 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:39,462 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:39,462 INFO L85 PathProgramCache]: Analyzing trace with hash 12174335, now seen corresponding path program 1 times [2023-11-21 19:53:39,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:39,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27580554] [2023-11-21 19:53:39,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:39,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:39,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:39,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:39,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:39,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27580554] [2023-11-21 19:53:39,764 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27580554] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:39,764 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473169368] [2023-11-21 19:53:39,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:39,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:39,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:39,766 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:39,793 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:53:39,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:39,876 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-21 19:53:39,878 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:39,910 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:53:39,910 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 19:53:39,920 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:53:39,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:53:39,946 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2023-11-21 19:53:39,953 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-21 19:53:39,964 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2023-11-21 19:53:39,980 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:39,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:40,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:40,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:40,013 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_439 (Array Int Int))) (= 2 (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_439) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|))) is different from false [2023-11-21 19:53:40,089 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:40,089 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2023-11-21 19:53:40,104 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-11-21 19:53:40,104 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2023-11-21 19:53:40,110 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-11-21 19:53:40,123 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-21 19:53:40,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-21 19:53:40,151 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 19:53:40,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473169368] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:40,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1273977529] [2023-11-21 19:53:40,156 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-21 19:53:40,157 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:40,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:40,158 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:40,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:41,210 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:53:43,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4378#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_ULTIMATE.start_main_~p~0#1.offset_141| Int) (|v_#memory_$Pointer$.offset_118| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_119| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_~p~0#1.base_167| Int) (|v_#memory_int_112| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_124| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_123| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_119| |v_ULTIMATE.start_main_~p~0#1.base_167| (store (select |v_#memory_$Pointer$.offset_119| |v_ULTIMATE.start_main_~p~0#1.base_167|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_141|) 0))) (= (store |v_#memory_$Pointer$.base_123| |v_ULTIMATE.start_main_~p~0#1.base_167| (store (select |v_#memory_$Pointer$.base_123| |v_ULTIMATE.start_main_~p~0#1.base_167|) |v_ULTIMATE.start_main_~p~0#1.offset_141| (select (select |v_#memory_$Pointer$.base_124| |v_ULTIMATE.start_main_~p~0#1.base_167|) |v_ULTIMATE.start_main_~p~0#1.offset_141|))) |v_#memory_$Pointer$.base_124|) (= (store |v_#memory_$Pointer$.base_124| |v_ULTIMATE.start_main_~p~0#1.base_167| (store (select |v_#memory_$Pointer$.base_124| |v_ULTIMATE.start_main_~p~0#1.base_167|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_141|) 0)) |#memory_$Pointer$.base|) (= (select |#valid| |v_ULTIMATE.start_main_~p~0#1.base_167|) 1) (<= (+ 8 |v_ULTIMATE.start_main_~p~0#1.offset_141|) (select |#length| |v_ULTIMATE.start_main_~p~0#1.base_167|)) (= (store |v_#memory_$Pointer$.offset_118| |v_ULTIMATE.start_main_~p~0#1.base_167| (store (select |v_#memory_$Pointer$.offset_118| |v_ULTIMATE.start_main_~p~0#1.base_167|) |v_ULTIMATE.start_main_~p~0#1.offset_141| (select (select |v_#memory_$Pointer$.offset_119| |v_ULTIMATE.start_main_~p~0#1.base_167|) |v_ULTIMATE.start_main_~p~0#1.offset_141|))) |v_#memory_$Pointer$.offset_119|) (<= 0 |v_ULTIMATE.start_main_~p~0#1.offset_141|) (= |#memory_int| (store |v_#memory_int_112| |v_ULTIMATE.start_main_~p~0#1.base_167| (store (store (select |v_#memory_int_112| |v_ULTIMATE.start_main_~p~0#1.base_167|) |v_ULTIMATE.start_main_~p~0#1.offset_141| 3) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_141|) (select (select |#memory_int| |v_ULTIMATE.start_main_~p~0#1.base_167|) (+ 4 |v_ULTIMATE.start_main_~p~0#1.offset_141|))))))) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~p~0#1.base|) 0) 2)) (<= 4 (select |#length| |ULTIMATE.start_main_~p~0#1.base|)) (= |ULTIMATE.start_main_~y~0#1| 0) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~p~0#1.base|) 0) 3)) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~p~0#1.base|) 0) 1)) (= |ULTIMATE.start_main_~a~0#1.base| |ULTIMATE.start_main_~p~0#1.base|) (= |ULTIMATE.start_main_~p~0#1.offset| 0) (= (select |#valid| |ULTIMATE.start_main_~p~0#1.base|) 1))' at error location [2023-11-21 19:53:43,103 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:53:43,104 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:53:43,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2023-11-21 19:53:43,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756048739] [2023-11-21 19:53:43,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:53:43,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 19:53:43,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:53:43,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 19:53:43,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=548, Unknown=7, NotChecked=48, Total=702 [2023-11-21 19:53:43,106 INFO L87 Difference]: Start difference. First operand 115 states and 132 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:43,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:53:43,486 INFO L93 Difference]: Finished difference Result 136 states and 153 transitions. [2023-11-21 19:53:43,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:53:43,486 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 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 23 [2023-11-21 19:53:43,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:53:43,487 INFO L225 Difference]: With dead ends: 136 [2023-11-21 19:53:43,487 INFO L226 Difference]: Without dead ends: 136 [2023-11-21 19:53:43,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=122, Invalid=743, Unknown=9, NotChecked=56, Total=930 [2023-11-21 19:53:43,489 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 40 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:53:43,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 172 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 293 Invalid, 0 Unknown, 86 Unchecked, 0.3s Time] [2023-11-21 19:53:43,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-11-21 19:53:43,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 117. [2023-11-21 19:53:43,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 102 states have (on average 1.3137254901960784) internal successors, (134), 116 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:43,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 134 transitions. [2023-11-21 19:53:43,493 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 134 transitions. Word has length 23 [2023-11-21 19:53:43,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:53:43,493 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 134 transitions. [2023-11-21 19:53:43,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 11 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:53:43,493 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 134 transitions. [2023-11-21 19:53:43,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:53:43,494 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:53:43,494 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:53:43,521 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:53:43,715 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-21 19:53:43,715 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 35 more)] === [2023-11-21 19:53:43,715 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:53:43,716 INFO L85 PathProgramCache]: Analyzing trace with hash 1761776732, now seen corresponding path program 1 times [2023-11-21 19:53:43,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:53:43,716 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919293229] [2023-11-21 19:53:43,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:43,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:53:43,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:44,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:44,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:53:44,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919293229] [2023-11-21 19:53:44,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919293229] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:53:44,033 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668573783] [2023-11-21 19:53:44,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:53:44,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:53:44,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:53:44,035 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:53:44,040 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f0221005-4e28-43a8-bd6b-b5cd66af5ee8/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:53:44,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:53:44,151 INFO L262 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-21 19:53:44,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:53:44,193 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:53:44,193 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-21 19:53:44,199 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-21 19:53:44,227 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2023-11-21 19:53:44,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:53:44,233 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2023-11-21 19:53:44,257 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2023-11-21 19:53:44,286 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:44,295 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:53:44,318 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:53:44,318 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:53:44,328 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_502 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~p~0#1.base| v_ArrVal_502) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) is different from false [2023-11-21 19:53:44,353 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_502 (Array Int Int))) (= (select (select (store |c_#memory_int| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~p~0#1.base|) (+ |c_ULTIMATE.start_main_~p~0#1.offset| 4)) v_ArrVal_502) |c_ULTIMATE.start_main_~a~0#1.base|) |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) is different from false [2023-11-21 19:53:45,234 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:53:45,235 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2023-11-21 19:53:45,251 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-11-21 19:53:45,251 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2023-11-21 19:53:45,256 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-11-21 19:53:45,266 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-21 19:53:45,266 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 13 treesize of output 12 [2023-11-21 19:53:45,281 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 19:53:45,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668573783] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:53:45,281 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1629414429] [2023-11-21 19:53:45,283 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-21 19:53:45,283 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:53:45,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:53:45,283 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:53:45,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:53:46,793 INFO L180 IcfgInterpreter]: Interpretation finished