./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/dll2n_update_all.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/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_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/dll2n_update_all.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c46cc56772f2c3f0b073640343b328fb3b128ed13803ffe5a04f6290fe624494 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:51:13,828 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:51:13,903 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:51:13,909 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:51:13,910 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:51:13,961 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:51:13,961 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:51:13,962 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:51:13,963 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:51:13,964 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:51:13,964 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:51:13,965 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:51:13,966 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:51:13,966 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:51:13,967 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:51:13,968 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:51:13,968 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:51:13,969 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:51:13,969 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:51:13,970 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:51:13,970 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:51:13,971 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:51:13,972 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:51:13,972 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:51:13,973 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:51:13,973 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:51:13,974 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:51:13,974 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:51:13,975 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:51:13,975 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:51:13,975 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:51:13,976 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:51:13,976 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:51:13,977 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:51:13,992 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:51:13,992 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:51:13,993 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:51:13,993 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:13,994 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:51:13,994 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:51:13,994 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:51:13,995 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:51:13,995 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:51:13,995 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:51:13,996 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:51:13,996 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:51:13,996 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:51:13,997 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_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c46cc56772f2c3f0b073640343b328fb3b128ed13803ffe5a04f6290fe624494 [2023-11-21 19:51:14,266 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:51:14,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:51:14,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:51:14,312 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:51:14,312 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:51:14,314 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/list-simple/dll2n_update_all.i [2023-11-21 19:51:17,405 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:51:17,705 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:51:17,705 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/sv-benchmarks/c/list-simple/dll2n_update_all.i [2023-11-21 19:51:17,723 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/data/e084a6c1a/548f15329af942ecb178b7f73662174f/FLAG4e2e3f2c1 [2023-11-21 19:51:17,738 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/data/e084a6c1a/548f15329af942ecb178b7f73662174f [2023-11-21 19:51:17,741 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:51:17,742 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:51:17,744 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:17,744 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:51:17,750 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:51:17,751 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:17" (1/1) ... [2023-11-21 19:51:17,752 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7eb21789 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:17, skipping insertion in model container [2023-11-21 19:51:17,752 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:51:17" (1/1) ... [2023-11-21 19:51:17,794 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:51:18,143 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/sv-benchmarks/c/list-simple/dll2n_update_all.i[24455,24468] [2023-11-21 19:51:18,148 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:18,159 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:51:18,204 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/sv-benchmarks/c/list-simple/dll2n_update_all.i[24455,24468] [2023-11-21 19:51:18,205 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:51:18,241 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:51:18,241 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18 WrapperNode [2023-11-21 19:51:18,241 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:51:18,243 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:18,243 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:51:18,243 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:51:18,251 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,266 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,292 INFO L138 Inliner]: procedures = 126, calls = 27, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 114 [2023-11-21 19:51:18,293 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:51:18,294 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:51:18,294 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:51:18,294 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:51:18,304 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,304 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,308 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,309 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,316 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,320 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,322 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,324 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,335 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:51:18,336 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:51:18,336 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:51:18,337 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:51:18,337 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (1/1) ... [2023-11-21 19:51:18,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:51:18,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:18,385 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:51:18,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:51:18,429 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-21 19:51:18,429 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-21 19:51:18,429 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:51:18,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:51:18,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 19:51:18,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:51:18,433 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-21 19:51:18,434 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-21 19:51:18,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:51:18,434 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:51:18,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:51:18,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:51:18,669 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:51:18,671 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:51:18,717 INFO L774 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-21 19:51:18,899 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:51:18,975 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:51:18,975 INFO L308 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-21 19:51:18,977 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:18 BoogieIcfgContainer [2023-11-21 19:51:18,977 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:51:18,980 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:51:18,980 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:51:18,983 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:51:18,983 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:51:17" (1/3) ... [2023-11-21 19:51:18,984 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1867d753 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:18, skipping insertion in model container [2023-11-21 19:51:18,984 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:51:18" (2/3) ... [2023-11-21 19:51:18,985 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1867d753 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:51:18, skipping insertion in model container [2023-11-21 19:51:18,985 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:51:18" (3/3) ... [2023-11-21 19:51:18,986 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_update_all.i [2023-11-21 19:51:19,009 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:51:19,009 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:51:19,063 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:51:19,071 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6953273a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:51:19,071 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:51:19,076 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 15 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:19,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 19:51:19,084 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:19,084 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:19,085 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:19,091 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:19,091 INFO L85 PathProgramCache]: Analyzing trace with hash 1570243634, now seen corresponding path program 1 times [2023-11-21 19:51:19,102 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:19,102 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710083434] [2023-11-21 19:51:19,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:19,103 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:19,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:19,423 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 19:51:19,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:19,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710083434] [2023-11-21 19:51:19,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710083434] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:19,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:19,426 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:51:19,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794302120] [2023-11-21 19:51:19,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:19,446 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:51:19,446 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:19,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:51:19,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:51:19,500 INFO L87 Difference]: Start difference. First operand has 17 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 15 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:19,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:19,599 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2023-11-21 19:51:19,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:51:19,601 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 19:51:19,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:19,609 INFO L225 Difference]: With dead ends: 31 [2023-11-21 19:51:19,609 INFO L226 Difference]: Without dead ends: 14 [2023-11-21 19:51:19,612 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:51:19,616 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:19,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 24 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:19,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-21 19:51:19,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 12. [2023-11-21 19:51:19,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 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 19:51:19,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2023-11-21 19:51:19,651 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 7 [2023-11-21 19:51:19,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:19,651 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2023-11-21 19:51:19,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:19,652 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2023-11-21 19:51:19,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-21 19:51:19,652 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:19,652 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:19,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:51:19,653 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:19,654 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:19,654 INFO L85 PathProgramCache]: Analyzing trace with hash 299858783, now seen corresponding path program 1 times [2023-11-21 19:51:19,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:19,654 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923222305] [2023-11-21 19:51:19,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:19,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:19,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:19,933 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:19,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:19,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923222305] [2023-11-21 19:51:19,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1923222305] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:19,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117013192] [2023-11-21 19:51:19,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:19,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:19,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:19,937 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:19,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:51:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:20,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:51:20,100 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:20,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:20,153 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:20,175 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:20,175 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1117013192] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:20,176 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665249243] [2023-11-21 19:51:20,197 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-21 19:51:20,197 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:20,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:20,207 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:20,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:21,412 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:21,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1665249243] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:21,595 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:21,595 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2023-11-21 19:51:21,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003357565] [2023-11-21 19:51:21,597 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:21,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:51:21,598 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:21,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:51:21,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:51:21,600 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 19:51:21,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:21,691 INFO L93 Difference]: Finished difference Result 19 states and 26 transitions. [2023-11-21 19:51:21,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:51:21,693 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 10 [2023-11-21 19:51:21,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:21,694 INFO L225 Difference]: With dead ends: 19 [2023-11-21 19:51:21,694 INFO L226 Difference]: Without dead ends: 14 [2023-11-21 19:51:21,695 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:51:21,698 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 2 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:21,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 13 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:21,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-21 19:51:21,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2023-11-21 19:51:21,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 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 19:51:21,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-11-21 19:51:21,709 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 10 [2023-11-21 19:51:21,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:21,709 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-11-21 19:51:21,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 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 19:51:21,710 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-11-21 19:51:21,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-21 19:51:21,712 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:21,715 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:21,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:21,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:21,931 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:21,932 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:21,932 INFO L85 PathProgramCache]: Analyzing trace with hash 1448453533, now seen corresponding path program 1 times [2023-11-21 19:51:21,932 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:21,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [549550490] [2023-11-21 19:51:21,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:21,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:21,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:22,047 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:22,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:22,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [549550490] [2023-11-21 19:51:22,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [549550490] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:22,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975279377] [2023-11-21 19:51:22,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:22,049 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:22,049 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:22,053 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:22,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:51:22,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:22,170 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:51:22,173 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:22,196 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:22,196 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:22,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:51:22,217 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975279377] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:22,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663038800] [2023-11-21 19:51:22,223 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:22,224 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:22,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:22,224 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:22,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:23,033 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:23,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [663038800] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:23,549 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:23,549 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3, 3, 3] total 8 [2023-11-21 19:51:23,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609012646] [2023-11-21 19:51:23,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:23,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:23,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:23,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:23,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:51:23,554 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.0) 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 19:51:23,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:23,720 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2023-11-21 19:51:23,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:51:23,722 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) 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 19:51:23,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:23,722 INFO L225 Difference]: With dead ends: 20 [2023-11-21 19:51:23,722 INFO L226 Difference]: Without dead ends: 15 [2023-11-21 19:51:23,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:51:23,724 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:23,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:51:23,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-21 19:51:23,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2023-11-21 19:51:23,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:23,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2023-11-21 19:51:23,730 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2023-11-21 19:51:23,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:23,731 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2023-11-21 19:51:23,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) 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 19:51:23,736 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2023-11-21 19:51:23,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-21 19:51:23,736 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:23,737 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:23,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:23,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:23,938 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:23,938 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:23,938 INFO L85 PathProgramCache]: Analyzing trace with hash 474531345, now seen corresponding path program 1 times [2023-11-21 19:51:23,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:23,939 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871209286] [2023-11-21 19:51:23,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:23,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:23,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:24,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:51:24,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:24,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871209286] [2023-11-21 19:51:24,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871209286] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:24,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853564217] [2023-11-21 19:51:24,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:24,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:24,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:24,043 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:24,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:51:24,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:24,164 INFO L262 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:51:24,165 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:24,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:51:24,183 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:24,204 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:51:24,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853564217] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:24,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [124236758] [2023-11-21 19:51:24,210 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:24,211 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:24,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:24,212 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:24,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:25,402 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:28,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '403#(and (= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~expected~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 (+ |ULTIMATE.start_dll_get_data_at_#res#1| 2147483648)) (<= |ULTIMATE.start_dll_get_data_at_#res#1| 2147483647) (exists ((|v_ULTIMATE.start_main_~new_data~0#1_22| Int) (|v_ULTIMATE.start_main_~i~0#1_57| Int)) (and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_dll_update_at_~head#1.base_31| Int) (|v_ULTIMATE.start_dll_update_at_~head#1.offset_31| Int) (|v_#memory_$Pointer$.base_65| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_65| (Array Int (Array Int Int))) (|v_#memory_int_78| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_65| |v_ULTIMATE.start_dll_update_at_~head#1.base_31| (store (select |v_#memory_$Pointer$.base_65| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31|))) |#memory_$Pointer$.base|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_65| |v_ULTIMATE.start_dll_update_at_~head#1.base_31| (store (select |v_#memory_$Pointer$.offset_65| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31|)))) (<= (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31|) 3) (<= 2 (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31|)) (= |#memory_int| (store |v_#memory_int_78| |v_ULTIMATE.start_dll_update_at_~head#1.base_31| (store (select |v_#memory_int_78| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31| (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_31|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_31|)))))) (= |v_ULTIMATE.start_main_~i~0#1_57| 2) (<= |v_ULTIMATE.start_main_~new_data~0#1_22| 3) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |v_ULTIMATE.start_main_~new_data~0#1_22|) (= |ULTIMATE.start_main_~s~0#1.offset| 0))) (= (select (select |#memory_int| |ULTIMATE.start_main_~s~0#1.base|) |ULTIMATE.start_main_~s~0#1.offset|) |ULTIMATE.start_dll_get_data_at_#res#1|) (not (= |ULTIMATE.start_main_~expected~0#1| |ULTIMATE.start_dll_get_data_at_#res#1|)))' at error location [2023-11-21 19:51:28,631 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:28,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:28,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2023-11-21 19:51:28,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548967597] [2023-11-21 19:51:28,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:28,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:51:28,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:28,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:51:28,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=125, Unknown=1, NotChecked=0, Total=156 [2023-11-21 19:51:28,633 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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 19:51:28,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:28,701 INFO L93 Difference]: Finished difference Result 26 states and 36 transitions. [2023-11-21 19:51:28,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:51:28,702 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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 13 [2023-11-21 19:51:28,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:28,702 INFO L225 Difference]: With dead ends: 26 [2023-11-21 19:51:28,703 INFO L226 Difference]: Without dead ends: 17 [2023-11-21 19:51:28,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=30, Invalid=125, Unknown=1, NotChecked=0, Total=156 [2023-11-21 19:51:28,704 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:28,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 15 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:28,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-21 19:51:28,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-21 19:51:28,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 16 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 19:51:28,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2023-11-21 19:51:28,710 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 13 [2023-11-21 19:51:28,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:28,710 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2023-11-21 19:51:28,711 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 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 19:51:28,711 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2023-11-21 19:51:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-21 19:51:28,712 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:28,712 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:28,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:28,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:28,933 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:28,933 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:28,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1856804994, now seen corresponding path program 2 times [2023-11-21 19:51:28,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:28,934 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509147367] [2023-11-21 19:51:28,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:28,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:28,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:29,103 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:51:29,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:29,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509147367] [2023-11-21 19:51:29,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509147367] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:29,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:29,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:51:29,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997429660] [2023-11-21 19:51:29,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:29,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:51:29,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:29,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:51:29,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:51:29,107 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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 19:51:29,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:29,187 INFO L93 Difference]: Finished difference Result 31 states and 41 transitions. [2023-11-21 19:51:29,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:51:29,188 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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 16 [2023-11-21 19:51:29,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:29,189 INFO L225 Difference]: With dead ends: 31 [2023-11-21 19:51:29,190 INFO L226 Difference]: Without dead ends: 24 [2023-11-21 19:51:29,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 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 19:51:29,192 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 6 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:29,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:29,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-21 19:51:29,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 19. [2023-11-21 19:51:29,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 0 states have call successors, (0), 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 19:51:29,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2023-11-21 19:51:29,207 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 16 [2023-11-21 19:51:29,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:29,208 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2023-11-21 19:51:29,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 4 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 19:51:29,208 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2023-11-21 19:51:29,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-21 19:51:29,209 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:29,209 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:29,210 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:51:29,210 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:29,210 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:29,211 INFO L85 PathProgramCache]: Analyzing trace with hash 1814988096, now seen corresponding path program 3 times [2023-11-21 19:51:29,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:29,211 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782097228] [2023-11-21 19:51:29,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:29,212 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:29,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:30,586 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:30,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:30,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782097228] [2023-11-21 19:51:30,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782097228] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:30,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165848933] [2023-11-21 19:51:30,586 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:51:30,587 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:30,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:30,588 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:30,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:51:31,302 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:51:31,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:51:31,306 INFO L262 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 78 conjunts are in the unsatisfiable core [2023-11-21 19:51:31,311 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:31,356 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-11-21 19:51:31,448 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:51:31,449 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 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 19:51:31,511 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 23 [2023-11-21 19:51:31,526 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-21 19:51:31,527 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 70 treesize of output 61 [2023-11-21 19:51:31,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-11-21 19:51:31,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:51:31,719 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 19:51:31,730 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 32 treesize of output 16 [2023-11-21 19:51:31,864 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 24 treesize of output 12 [2023-11-21 19:51:31,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 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 19:51:32,096 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:32,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:32,147 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_341 (Array Int Int))) (= |c_ULTIMATE.start_main_~len~0#1| (select (select (store |c_#memory_int| |c_ULTIMATE.start_dll_update_at_~head#1.base| v_ArrVal_341) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|))) is different from false [2023-11-21 19:51:32,158 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_341 (Array Int Int))) (= |c_ULTIMATE.start_main_~len~0#1| (select (select (store |c_#memory_int| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_update_at_~head#1.base|) (+ |c_ULTIMATE.start_dll_update_at_~head#1.offset| 4)) v_ArrVal_341) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|))) is different from false [2023-11-21 19:51:32,175 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_341 (Array Int Int))) (= |c_ULTIMATE.start_main_~len~0#1| (select (select (store |c_#memory_int| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~s~0#1.base|) (+ |c_ULTIMATE.start_main_~s~0#1.offset| 4)) v_ArrVal_341) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|))) is different from false [2023-11-21 19:51:32,185 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_341 (Array Int Int)) (v_ArrVal_338 Int)) (= |c_ULTIMATE.start_main_~len~0#1| (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_dll_update_at_~head#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_dll_update_at_~head#1.base|) |c_ULTIMATE.start_dll_update_at_~head#1.offset| |c_ULTIMATE.start_dll_update_at_~data#1|)) (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_update_at_~head#1.base| (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_update_at_~head#1.base|) |c_ULTIMATE.start_dll_update_at_~head#1.offset| v_ArrVal_338)) |c_ULTIMATE.start_main_~s~0#1.base|) (+ |c_ULTIMATE.start_main_~s~0#1.offset| 4)) v_ArrVal_341) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|))) is different from false [2023-11-21 19:51:32,362 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:51:32,363 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 87 treesize of output 107 [2023-11-21 19:51:32,401 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-11-21 19:51:32,401 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 75 [2023-11-21 19:51:32,441 INFO L349 Elim1Store]: treesize reduction 17, result has 39.3 percent of original size [2023-11-21 19:51:32,441 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 92 [2023-11-21 19:51:32,475 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2023-11-21 19:51:32,530 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 9 treesize of output 1 [2023-11-21 19:51:32,544 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:51:32,544 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 19:51:32,552 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 42 treesize of output 34 [2023-11-21 19:51:32,558 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 5 treesize of output 3 [2023-11-21 19:51:32,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:51:32,575 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 14 [2023-11-21 19:51:32,578 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 8 treesize of output 4 [2023-11-21 19:51:32,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:51:32,682 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-21 19:51:32,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165848933] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:32,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1955459949] [2023-11-21 19:51:32,685 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:32,686 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:32,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:32,686 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:32,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:33,759 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:37,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '703#(and (= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~expected~0#1|) (exists ((|v_ULTIMATE.start_main_~new_data~0#1_30| Int) (|v_ULTIMATE.start_main_~i~0#1_69| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~new_data~0#1_30| 3) (exists ((|v_#memory_$Pointer$.offset_84| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_85| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.base_46| Int) (|v_#memory_int_105| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.offset_44| Int)) (and (<= 2 (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44|)) (<= (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44|) 3) (= |#memory_int| (store |v_#memory_int_105| |v_ULTIMATE.start_dll_update_at_~head#1.base_46| (store (select |v_#memory_int_105| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44| (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44|)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_84| |v_ULTIMATE.start_dll_update_at_~head#1.base_46| (store (select |v_#memory_$Pointer$.offset_84| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44|)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_85| |v_ULTIMATE.start_dll_update_at_~head#1.base_46| (store (select |v_#memory_$Pointer$.base_85| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_dll_update_at_~head#1.base_46|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_44|)))))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |v_ULTIMATE.start_main_~new_data~0#1_30|) (= |v_ULTIMATE.start_main_~i~0#1_69| 2) (= |ULTIMATE.start_main_~s~0#1.offset| 0))) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 (+ |ULTIMATE.start_dll_get_data_at_#res#1| 2147483648)) (<= |ULTIMATE.start_dll_get_data_at_#res#1| 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~s~0#1.base|) |ULTIMATE.start_main_~s~0#1.offset|) |ULTIMATE.start_dll_get_data_at_#res#1|) (not (= |ULTIMATE.start_main_~expected~0#1| |ULTIMATE.start_dll_get_data_at_#res#1|)))' at error location [2023-11-21 19:51:37,590 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:37,590 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:37,590 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 39 [2023-11-21 19:51:37,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844952101] [2023-11-21 19:51:37,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:37,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-11-21 19:51:37,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:37,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-11-21 19:51:37,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1658, Unknown=5, NotChecked=340, Total=2162 [2023-11-21 19:51:37,594 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 39 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 39 states have internal predecessors, (49), 0 states have call successors, (0), 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 19:51:38,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:38,769 INFO L93 Difference]: Finished difference Result 43 states and 58 transitions. [2023-11-21 19:51:38,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-21 19:51:38,770 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 39 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-21 19:51:38,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:38,772 INFO L225 Difference]: With dead ends: 43 [2023-11-21 19:51:38,772 INFO L226 Difference]: Without dead ends: 41 [2023-11-21 19:51:38,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=284, Invalid=2589, Unknown=5, NotChecked=428, Total=3306 [2023-11-21 19:51:38,774 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 79 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 706 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:38,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 108 Invalid, 706 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 493 Invalid, 0 Unknown, 208 Unchecked, 0.6s Time] [2023-11-21 19:51:38,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-21 19:51:38,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 27. [2023-11-21 19:51:38,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:38,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions. [2023-11-21 19:51:38,786 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 18 [2023-11-21 19:51:38,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:38,787 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 37 transitions. [2023-11-21 19:51:38,787 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 39 states have internal predecessors, (49), 0 states have call successors, (0), 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 19:51:38,787 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions. [2023-11-21 19:51:38,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:51:38,788 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:38,788 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:38,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:39,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:39,002 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:39,002 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:39,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1047799090, now seen corresponding path program 4 times [2023-11-21 19:51:39,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:39,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394838103] [2023-11-21 19:51:39,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:39,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:39,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:39,119 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:51:39,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:39,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394838103] [2023-11-21 19:51:39,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394838103] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:39,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563358983] [2023-11-21 19:51:39,120 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:51:39,120 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:39,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:39,121 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:39,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:51:39,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:39,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:51:39,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:39,306 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:51:39,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:51:39,329 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563358983] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:39,329 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502878905] [2023-11-21 19:51:39,331 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:39,332 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:39,332 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:39,332 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:39,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:40,149 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:43,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '963#(and (= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~expected~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 (+ |ULTIMATE.start_dll_get_data_at_#res#1| 2147483648)) (<= |ULTIMATE.start_dll_get_data_at_#res#1| 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~s~0#1.base|) |ULTIMATE.start_main_~s~0#1.offset|) |ULTIMATE.start_dll_get_data_at_#res#1|) (exists ((|v_ULTIMATE.start_main_~i~0#1_80| Int) (|v_ULTIMATE.start_main_~new_data~0#1_38| Int)) (and (<= 2 |v_ULTIMATE.start_main_~new_data~0#1_38|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~data~0#1| 1) (exists ((|v_#memory_$Pointer$.base_99| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.base_59| Int) (|v_#memory_$Pointer$.offset_98| (Array Int (Array Int Int))) (|v_#memory_int_123| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.offset_57| Int)) (and (<= (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57|) 3) (= |#memory_int| (store |v_#memory_int_123| |v_ULTIMATE.start_dll_update_at_~head#1.base_59| (store (select |v_#memory_int_123| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57| (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57|)))) (<= 2 (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57|)) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_dll_update_at_~head#1.base_59| (store (select |v_#memory_$Pointer$.offset_98| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57|)))) (= (store |v_#memory_$Pointer$.base_99| |v_ULTIMATE.start_dll_update_at_~head#1.base_59| (store (select |v_#memory_$Pointer$.base_99| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_dll_update_at_~head#1.base_59|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_57|))) |#memory_$Pointer$.base|))) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (= |v_ULTIMATE.start_main_~i~0#1_80| 2) (<= |v_ULTIMATE.start_main_~new_data~0#1_38| 3) (= |ULTIMATE.start_main_~s~0#1.offset| 0))) (not (= |ULTIMATE.start_main_~expected~0#1| |ULTIMATE.start_dll_get_data_at_#res#1|)))' at error location [2023-11-21 19:51:43,256 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:43,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:43,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2023-11-21 19:51:43,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2386265] [2023-11-21 19:51:43,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:43,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:51:43,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:43,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:51:43,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=161, Unknown=1, NotChecked=0, Total=210 [2023-11-21 19:51:43,258 INFO L87 Difference]: Start difference. First operand 27 states and 37 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:43,377 INFO L93 Difference]: Finished difference Result 45 states and 61 transitions. [2023-11-21 19:51:43,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:51:43,378 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:51:43,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:43,379 INFO L225 Difference]: With dead ends: 45 [2023-11-21 19:51:43,379 INFO L226 Difference]: Without dead ends: 38 [2023-11-21 19:51:43,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=68, Invalid=237, Unknown=1, NotChecked=0, Total=306 [2023-11-21 19:51:43,380 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 12 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:43,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 24 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:43,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-21 19:51:43,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2023-11-21 19:51:43,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2023-11-21 19:51:43,392 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 19 [2023-11-21 19:51:43,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:43,392 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2023-11-21 19:51:43,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,392 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2023-11-21 19:51:43,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:51:43,393 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:43,393 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:43,413 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:43,594 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:43,594 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:43,594 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:43,595 INFO L85 PathProgramCache]: Analyzing trace with hash 428634211, now seen corresponding path program 1 times [2023-11-21 19:51:43,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:43,595 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840760610] [2023-11-21 19:51:43,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:43,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:43,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:43,686 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:51:43,687 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:43,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840760610] [2023-11-21 19:51:43,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840760610] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:43,687 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:51:43,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:51:43,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003907650] [2023-11-21 19:51:43,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:43,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:51:43,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:43,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:51:43,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:51:43,690 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:43,748 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-11-21 19:51:43,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:51:43,748 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:51:43,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:43,753 INFO L225 Difference]: With dead ends: 38 [2023-11-21 19:51:43,753 INFO L226 Difference]: Without dead ends: 33 [2023-11-21 19:51:43,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 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 19:51:43,755 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 5 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:43,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:51:43,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-21 19:51:43,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2023-11-21 19:51:43,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2023-11-21 19:51:43,776 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 19 [2023-11-21 19:51:43,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:43,776 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2023-11-21 19:51:43,776 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:43,777 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2023-11-21 19:51:43,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:51:43,777 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:43,777 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:43,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 19:51:43,778 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:43,778 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:43,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1493809982, now seen corresponding path program 5 times [2023-11-21 19:51:43,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:43,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250470196] [2023-11-21 19:51:43,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:43,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:43,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:43,922 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 19:51:43,922 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:43,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250470196] [2023-11-21 19:51:43,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250470196] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:43,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35964914] [2023-11-21 19:51:43,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:51:43,923 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:43,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:43,927 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:43,951 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:51:44,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:51:44,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:51:44,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:51:44,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:44,172 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:51:44,172 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:51:44,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35964914] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:51:44,173 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:51:44,173 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 8 [2023-11-21 19:51:44,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954010331] [2023-11-21 19:51:44,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:51:44,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:51:44,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:44,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:51:44,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:51:44,175 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 19:51:44,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:44,252 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2023-11-21 19:51:44,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:51:44,252 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 20 [2023-11-21 19:51:44,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:44,253 INFO L225 Difference]: With dead ends: 44 [2023-11-21 19:51:44,253 INFO L226 Difference]: Without dead ends: 37 [2023-11-21 19:51:44,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:51:44,254 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 19 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:44,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 15 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:44,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-21 19:51:44,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2023-11-21 19:51:44,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 29 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:44,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2023-11-21 19:51:44,271 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 20 [2023-11-21 19:51:44,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:44,271 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2023-11-21 19:51:44,271 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 19:51:44,272 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2023-11-21 19:51:44,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:51:44,273 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:44,273 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:44,299 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:44,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:44,494 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:44,494 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:44,494 INFO L85 PathProgramCache]: Analyzing trace with hash -54969726, now seen corresponding path program 6 times [2023-11-21 19:51:44,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:44,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421195889] [2023-11-21 19:51:44,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:44,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:44,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:44,590 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 19:51:44,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:44,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421195889] [2023-11-21 19:51:44,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421195889] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:44,591 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786605660] [2023-11-21 19:51:44,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:51:44,591 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:44,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:44,592 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:44,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:51:44,757 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:51:44,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:51:44,759 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:51:44,761 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:44,774 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 19:51:44,774 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:44,795 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 19:51:44,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786605660] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:44,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277080868] [2023-11-21 19:51:44,797 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:44,798 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:44,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:44,798 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:44,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:45,546 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:50,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1526#(and (= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~expected~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 (+ |ULTIMATE.start_dll_get_data_at_#res#1| 2147483648)) (<= |ULTIMATE.start_dll_get_data_at_#res#1| 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~s~0#1.base|) |ULTIMATE.start_main_~s~0#1.offset|) |ULTIMATE.start_dll_get_data_at_#res#1|) (exists ((|v_ULTIMATE.start_main_~i~0#1_94| Int) (|v_ULTIMATE.start_main_~new_data~0#1_47| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 2 |v_ULTIMATE.start_main_~new_data~0#1_47|) (<= |v_ULTIMATE.start_main_~new_data~0#1_47| 3) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (= |v_ULTIMATE.start_main_~i~0#1_94| 2) (exists ((|v_#memory_$Pointer$.offset_119| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.offset_70| Int) (|v_#memory_int_154| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.base_72| Int) (|v_#memory_$Pointer$.base_120| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_120| |v_ULTIMATE.start_dll_update_at_~head#1.base_72| (store (select |v_#memory_$Pointer$.base_120| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70|))) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_154| |v_ULTIMATE.start_dll_update_at_~head#1.base_72| (store (select |v_#memory_int_154| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70| (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70|)))) (<= (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70|) 3) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_119| |v_ULTIMATE.start_dll_update_at_~head#1.base_72| (store (select |v_#memory_$Pointer$.offset_119| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70|)))) (<= 2 (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_72|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_70|)))) (= |ULTIMATE.start_main_~s~0#1.offset| 0))) (not (= |ULTIMATE.start_main_~expected~0#1| |ULTIMATE.start_dll_get_data_at_#res#1|)))' at error location [2023-11-21 19:51:50,677 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:50,677 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:50,677 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2023-11-21 19:51:50,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12445637] [2023-11-21 19:51:50,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:50,678 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:50,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:50,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:50,679 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=141, Unknown=2, NotChecked=0, Total=182 [2023-11-21 19:51:50,679 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 19:51:50,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:50,769 INFO L93 Difference]: Finished difference Result 43 states and 56 transitions. [2023-11-21 19:51:50,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:51:50,770 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 19:51:50,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:50,770 INFO L225 Difference]: With dead ends: 43 [2023-11-21 19:51:50,770 INFO L226 Difference]: Without dead ends: 32 [2023-11-21 19:51:50,771 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=44, Invalid=164, Unknown=2, NotChecked=0, Total=210 [2023-11-21 19:51:50,771 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 23 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:50,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 21 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:50,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-21 19:51:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2023-11-21 19:51:50,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:51:50,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-11-21 19:51:50,781 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 20 [2023-11-21 19:51:50,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:50,782 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-11-21 19:51:50,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 19:51:50,782 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-11-21 19:51:50,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 19:51:50,783 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:50,783 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:50,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:50,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:51:50,991 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:50,992 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:50,992 INFO L85 PathProgramCache]: Analyzing trace with hash 995539652, now seen corresponding path program 1 times [2023-11-21 19:51:50,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:50,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191786344] [2023-11-21 19:51:50,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:50,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:51,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:51,091 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:51:51,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:51,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191786344] [2023-11-21 19:51:51,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191786344] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:51,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426615676] [2023-11-21 19:51:51,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:51,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:51,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:51,093 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:51,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:51:51,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:51,265 INFO L262 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:51:51,272 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:51,288 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:51:51,289 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:51:51,313 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:51:51,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426615676] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:51:51,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363751833] [2023-11-21 19:51:51,318 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:51:51,318 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:51:51,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:51:51,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:51:51,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:51:52,105 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:51:57,801 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1782#(and (= |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~expected~0#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 (+ |ULTIMATE.start_dll_get_data_at_#res#1| 2147483648)) (<= |ULTIMATE.start_dll_get_data_at_#res#1| 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~s~0#1.base|) |ULTIMATE.start_main_~s~0#1.offset|) |ULTIMATE.start_dll_get_data_at_#res#1|) (exists ((|v_ULTIMATE.start_main_~i~0#1_103| Int) (|v_ULTIMATE.start_main_~new_data~0#1_53| Int)) (and (<= 1 |#StackHeapBarrier|) (<= |v_ULTIMATE.start_main_~new_data~0#1_53| 3) (exists ((|v_#memory_int_170| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.base_81| Int) (|v_#memory_$Pointer$.offset_131| (Array Int (Array Int Int))) (|v_ULTIMATE.start_dll_update_at_~head#1.offset_79| Int) (|v_#memory_$Pointer$.base_132| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_170| |v_ULTIMATE.start_dll_update_at_~head#1.base_81| (store (select |v_#memory_int_170| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79| (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79|)))) (= (store |v_#memory_$Pointer$.base_132| |v_ULTIMATE.start_dll_update_at_~head#1.base_81| (store (select |v_#memory_$Pointer$.base_132| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79|))) |#memory_$Pointer$.base|) (<= 2 (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79|)) (<= (select (select |#memory_int| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79|) 3) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_131| |v_ULTIMATE.start_dll_update_at_~head#1.base_81| (store (select |v_#memory_$Pointer$.offset_131| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79| (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_dll_update_at_~head#1.base_81|) |v_ULTIMATE.start_dll_update_at_~head#1.offset_79|)))))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (= 2 |v_ULTIMATE.start_main_~i~0#1_103|) (<= 2 |v_ULTIMATE.start_main_~new_data~0#1_53|) (= |ULTIMATE.start_main_~s~0#1.offset| 0))) (not (= |ULTIMATE.start_main_~expected~0#1| |ULTIMATE.start_dll_get_data_at_#res#1|)))' at error location [2023-11-21 19:51:57,802 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:51:57,802 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:51:57,802 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2023-11-21 19:51:57,802 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217497669] [2023-11-21 19:51:57,802 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:51:57,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:51:57,803 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:51:57,803 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:51:57,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=144, Unknown=2, NotChecked=0, Total=182 [2023-11-21 19:51:57,804 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 19:51:57,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:51:57,906 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2023-11-21 19:51:57,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:51:57,906 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 21 [2023-11-21 19:51:57,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:51:57,907 INFO L225 Difference]: With dead ends: 38 [2023-11-21 19:51:57,907 INFO L226 Difference]: Without dead ends: 33 [2023-11-21 19:51:57,907 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=41, Invalid=167, Unknown=2, NotChecked=0, Total=210 [2023-11-21 19:51:57,908 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 17 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:51:57,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 23 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:51:57,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-21 19:51:57,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2023-11-21 19:51:57,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 states have internal predecessors, (36), 0 states have call successors, (0), 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 19:51:57,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2023-11-21 19:51:57,922 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 21 [2023-11-21 19:51:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:51:57,923 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2023-11-21 19:51:57,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 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 19:51:57,923 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2023-11-21 19:51:57,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:51:57,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:51:57,927 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:51:57,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 19:51:58,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-21 19:51:58,148 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:51:58,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:51:58,148 INFO L85 PathProgramCache]: Analyzing trace with hash 795536223, now seen corresponding path program 1 times [2023-11-21 19:51:58,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:51:58,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373388856] [2023-11-21 19:51:58,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:58,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:51:58,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:59,556 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:51:59,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:51:59,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373388856] [2023-11-21 19:51:59,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373388856] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:51:59,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258991829] [2023-11-21 19:51:59,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:51:59,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:51:59,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:51:59,562 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:51:59,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 19:51:59,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:51:59,746 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 85 conjunts are in the unsatisfiable core [2023-11-21 19:51:59,750 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:51:59,775 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-11-21 19:51:59,858 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-21 19:51:59,859 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 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 19:51:59,910 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 27 [2023-11-21 19:51:59,923 INFO L349 Elim1Store]: treesize reduction 21, result has 19.2 percent of original size [2023-11-21 19:51:59,924 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 86 treesize of output 77 [2023-11-21 19:51:59,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:52:00,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:52:00,089 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 36 treesize of output 18 [2023-11-21 19:52:00,290 INFO L349 Elim1Store]: treesize reduction 21, result has 19.2 percent of original size [2023-11-21 19:52:00,291 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 90 treesize of output 81 [2023-11-21 19:52:00,296 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 19 [2023-11-21 19:52:00,299 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 23 [2023-11-21 19:52:00,564 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 49 treesize of output 25 [2023-11-21 19:52:00,568 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 23 treesize of output 11 [2023-11-21 19:52:00,655 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:52:00,655 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:52:00,844 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 86 treesize of output 64 [2023-11-21 19:52:00,859 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_ULTIMATE.start_main_~s~0#1.offset| 4))) (and (forall ((v_ArrVal_1015 (Array Int Int))) (= |c_ULTIMATE.start_dll_update_at_~head#1.offset| (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_dll_update_at_~head#1.base| v_ArrVal_1015) |c_ULTIMATE.start_main_~s~0#1.base|) .cse0))) (forall ((v_ArrVal_1014 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_update_at_~head#1.base| v_ArrVal_1014) |c_ULTIMATE.start_main_~s~0#1.base|) .cse0) |c_ULTIMATE.start_dll_update_at_~head#1.base|)) (= |c_ULTIMATE.start_dll_update_at_~data#1| (+ |c_ULTIMATE.start_main_~len~0#1| 1)))) is different from false [2023-11-21 19:52:00,876 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:52:00,877 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 50 treesize of output 43 [2023-11-21 19:52:00,881 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 17 treesize of output 13 [2023-11-21 19:52:01,254 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:52:01,254 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 87 treesize of output 107 [2023-11-21 19:52:01,291 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-11-21 19:52:01,292 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 75 [2023-11-21 19:52:01,320 INFO L349 Elim1Store]: treesize reduction 17, result has 39.3 percent of original size [2023-11-21 19:52:01,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 92 [2023-11-21 19:52:01,338 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 15 [2023-11-21 19:52:01,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:52:01,378 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 40 treesize of output 36 [2023-11-21 19:52:01,381 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-21 19:52:01,382 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 29 treesize of output 21 [2023-11-21 19:52:01,387 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-21 19:52:01,389 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 8 treesize of output 4 [2023-11-21 19:52:01,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:52:01,537 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-21 19:52:01,537 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258991829] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:52:01,537 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [743424298] [2023-11-21 19:52:01,539 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:52:01,539 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:52:01,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:52:01,540 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:52:01,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:52:07,992 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:52:08,623 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1904#true' at error location [2023-11-21 19:52:08,623 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:52:08,623 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:52:08,623 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 46 [2023-11-21 19:52:08,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456238859] [2023-11-21 19:52:08,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:52:08,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2023-11-21 19:52:08,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:52:08,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2023-11-21 19:52:08,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2197, Unknown=1, NotChecked=94, Total=2450 [2023-11-21 19:52:08,628 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 46 states, 46 states have (on average 1.326086956521739) internal successors, (61), 46 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:10,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:52:10,540 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2023-11-21 19:52:10,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-21 19:52:10,540 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.326086956521739) internal successors, (61), 46 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-21 19:52:10,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:52:10,541 INFO L225 Difference]: With dead ends: 55 [2023-11-21 19:52:10,541 INFO L226 Difference]: Without dead ends: 53 [2023-11-21 19:52:10,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=332, Invalid=3703, Unknown=1, NotChecked=124, Total=4160 [2023-11-21 19:52:10,545 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 100 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 766 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:52:10,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 132 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 766 Invalid, 0 Unknown, 48 Unchecked, 1.0s Time] [2023-11-21 19:52:10,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-21 19:52:10,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 37. [2023-11-21 19:52:10,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.25) internal successors, (45), 36 states have internal predecessors, (45), 0 states have call successors, (0), 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 19:52:10,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2023-11-21 19:52:10,559 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 22 [2023-11-21 19:52:10,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:52:10,559 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2023-11-21 19:52:10,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.326086956521739) internal successors, (61), 46 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:10,559 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2023-11-21 19:52:10,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:52:10,560 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:52:10,560 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:52:10,584 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-21 19:52:10,767 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-21 19:52:10,767 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:52:10,767 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:52:10,767 INFO L85 PathProgramCache]: Analyzing trace with hash 985589118, now seen corresponding path program 7 times [2023-11-21 19:52:10,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:52:10,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554867106] [2023-11-21 19:52:10,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:52:10,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:52:10,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:10,907 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-21 19:52:10,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:52:10,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554867106] [2023-11-21 19:52:10,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1554867106] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:52:10,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285707597] [2023-11-21 19:52:10,908 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:52:10,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:10,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:10,911 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:52:10,920 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-21 19:52:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:11,111 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:52:11,113 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:52:11,166 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-21 19:52:11,166 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-21 19:52:11,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285707597] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:52:11,167 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-21 19:52:11,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 9 [2023-11-21 19:52:11,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529662048] [2023-11-21 19:52:11,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:52:11,168 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-21 19:52:11,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:52:11,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-21 19:52:11,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:52:11,169 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 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 19:52:11,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:52:11,251 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2023-11-21 19:52:11,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:52:11,255 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 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 19:52:11,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:52:11,256 INFO L225 Difference]: With dead ends: 43 [2023-11-21 19:52:11,256 INFO L226 Difference]: Without dead ends: 24 [2023-11-21 19:52:11,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:52:11,257 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:52:11,257 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 16 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:52:11,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-21 19:52:11,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-21 19:52:11,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:52:11,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2023-11-21 19:52:11,266 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2023-11-21 19:52:11,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:52:11,266 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2023-11-21 19:52:11,267 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 0 states have call successors, (0), 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 19:52:11,267 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2023-11-21 19:52:11,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:52:11,269 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:52:11,269 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:52:11,291 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-21 19:52:11,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-21 19:52:11,483 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:52:11,483 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:52:11,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1109602780, now seen corresponding path program 2 times [2023-11-21 19:52:11,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:52:11,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191618444] [2023-11-21 19:52:11,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:52:11,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:52:11,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:52:11,588 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-21 19:52:11,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:52:11,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191618444] [2023-11-21 19:52:11,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191618444] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:52:11,589 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172003051] [2023-11-21 19:52:11,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:52:11,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:52:11,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:52:11,591 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:52:11,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_00eb765b-6ca9-44eb-91d2-578fcbd19c8b/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-21 19:52:11,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-21 19:52:11,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:52:11,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:52:11,788 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:52:11,824 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:52:11,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:52:11,866 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:52:11,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172003051] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:52:11,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [310170266] [2023-11-21 19:52:11,868 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:52:11,868 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:52:11,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:52:11,869 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:52:11,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs