./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 0e0057cc 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_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash f1741d130075f1f7f25c8fd49724f342261e16295a533d1b7fc59c9fdd3354e1 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:48:04,922 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:48:04,986 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-12-02 16:48:04,992 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:48:04,993 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:48:05,015 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:48:05,016 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:48:05,017 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:48:05,018 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:48:05,018 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:48:05,019 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:48:05,019 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:48:05,020 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:48:05,020 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:48:05,021 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:48:05,021 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:48:05,022 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:48:05,022 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:48:05,023 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:48:05,023 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:48:05,024 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:48:05,024 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:48:05,025 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-12-02 16:48:05,025 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-12-02 16:48:05,026 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:48:05,026 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:48:05,027 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:48:05,027 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-12-02 16:48:05,027 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-12-02 16:48:05,028 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-12-02 16:48:05,028 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:48:05,029 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 16:48:05,029 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-12-02 16:48:05,029 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:48:05,029 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:48:05,030 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:48:05,030 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:48:05,030 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:48:05,030 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:48:05,030 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:48:05,031 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:48:05,031 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:48:05,031 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:48:05,031 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:48:05,031 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:48:05,032 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_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f1741d130075f1f7f25c8fd49724f342261e16295a533d1b7fc59c9fdd3354e1 [2023-12-02 16:48:05,265 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:48:05,285 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:48:05,288 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:48:05,289 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:48:05,290 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:48:05,291 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i [2023-12-02 16:48:08,088 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:48:08,323 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:48:08,324 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i [2023-12-02 16:48:08,346 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/data/e609548e6/b078aaaf2aba4d68a8a2d28afdc4d9c2/FLAG23105fc29 [2023-12-02 16:48:08,358 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/data/e609548e6/b078aaaf2aba4d68a8a2d28afdc4d9c2 [2023-12-02 16:48:08,360 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:48:08,362 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:48:08,363 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:48:08,363 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:48:08,368 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:48:08,369 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,369 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47f999dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08, skipping insertion in model container [2023-12-02 16:48:08,370 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,466 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:48:08,723 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:48:08,732 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:48:08,776 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:48:08,808 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:48:08,808 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08 WrapperNode [2023-12-02 16:48:08,808 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:48:08,809 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:48:08,809 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:48:08,810 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:48:08,817 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,831 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,853 INFO L138 Inliner]: procedures = 121, calls = 26, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 93 [2023-12-02 16:48:08,853 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:48:08,854 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:48:08,854 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:48:08,854 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:48:08,861 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,861 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,865 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,865 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,872 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,875 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,877 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,878 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,880 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:48:08,881 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:48:08,881 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:48:08,881 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:48:08,881 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (1/1) ... [2023-12-02 16:48:08,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:48:08,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:08,907 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:48:08,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:48:08,941 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero_internal [2023-12-02 16:48:08,942 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero_internal [2023-12-02 16:48:08,942 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero [2023-12-02 16:48:08,942 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero [2023-12-02 16:48:08,942 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 16:48:08,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 16:48:08,942 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 16:48:08,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 16:48:08,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:48:08,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:48:09,062 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:48:09,064 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:48:09,317 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:48:09,372 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:48:09,372 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-12-02 16:48:09,374 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:48:09 BoogieIcfgContainer [2023-12-02 16:48:09,374 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:48:09,377 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:48:09,378 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:48:09,381 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:48:09,381 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:48:08" (1/3) ... [2023-12-02 16:48:09,382 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b836a1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:48:09, skipping insertion in model container [2023-12-02 16:48:09,382 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:48:08" (2/3) ... [2023-12-02 16:48:09,383 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b836a1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:48:09, skipping insertion in model container [2023-12-02 16:48:09,383 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:48:09" (3/3) ... [2023-12-02 16:48:09,384 INFO L112 eAbstractionObserver]: Analyzing ICFG sll-shared-sll-after.i [2023-12-02 16:48:09,404 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:48:09,404 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 29 error locations. [2023-12-02 16:48:09,453 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:48:09,460 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@67044280, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:48:09,461 INFO L358 AbstractCegarLoop]: Starting to check reachability of 29 error locations. [2023-12-02 16:48:09,465 INFO L276 IsEmpty]: Start isEmpty. Operand has 68 states, 32 states have (on average 2.125) internal successors, (68), 61 states have internal predecessors, (68), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:48:09,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 16:48:09,479 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:09,480 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 16:48:09,481 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:09,487 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:09,487 INFO L85 PathProgramCache]: Analyzing trace with hash 5796754, now seen corresponding path program 1 times [2023-12-02 16:48:09,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:09,495 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995014913] [2023-12-02 16:48:09,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:09,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:09,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:09,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:09,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:09,707 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995014913] [2023-12-02 16:48:09,707 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995014913] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:09,708 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:09,708 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:48:09,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115199114] [2023-12-02 16:48:09,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:09,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:48:09,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:09,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:48:09,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:48:09,746 INFO L87 Difference]: Start difference. First operand has 68 states, 32 states have (on average 2.125) internal successors, (68), 61 states have internal predecessors, (68), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-12-02 16:48:09,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:09,842 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2023-12-02 16:48:09,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:48:09,844 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) Word has length 4 [2023-12-02 16:48:09,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:09,853 INFO L225 Difference]: With dead ends: 66 [2023-12-02 16:48:09,853 INFO L226 Difference]: Without dead ends: 65 [2023-12-02 16:48:09,855 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 [2023-12-02 16:48:09,859 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 4 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:09,860 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 87 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:09,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-12-02 16:48:09,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-12-02 16:48:09,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 32 states have (on average 1.96875) internal successors, (63), 58 states have internal predecessors, (63), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:48:09,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2023-12-02 16:48:09,898 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 4 [2023-12-02 16:48:09,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:09,898 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2023-12-02 16:48:09,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-12-02 16:48:09,899 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2023-12-02 16:48:09,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-12-02 16:48:09,899 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:09,899 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-12-02 16:48:09,900 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 16:48:09,900 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:09,901 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:09,901 INFO L85 PathProgramCache]: Analyzing trace with hash 5796755, now seen corresponding path program 1 times [2023-12-02 16:48:09,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:09,901 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007951046] [2023-12-02 16:48:09,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:09,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:09,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:09,993 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:09,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:09,994 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007951046] [2023-12-02 16:48:09,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007951046] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:09,994 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:09,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:48:09,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898256432] [2023-12-02 16:48:09,995 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:09,996 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:48:09,996 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:09,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:48:09,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:48:09,998 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-12-02 16:48:10,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:10,063 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2023-12-02 16:48:10,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:48:10,064 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) Word has length 4 [2023-12-02 16:48:10,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:10,066 INFO L225 Difference]: With dead ends: 63 [2023-12-02 16:48:10,066 INFO L226 Difference]: Without dead ends: 63 [2023-12-02 16:48:10,066 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 [2023-12-02 16:48:10,068 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 2 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:10,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 92 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:10,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-12-02 16:48:10,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-12-02 16:48:10,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 32 states have (on average 1.90625) internal successors, (61), 56 states have internal predecessors, (61), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:48:10,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 69 transitions. [2023-12-02 16:48:10,078 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 69 transitions. Word has length 4 [2023-12-02 16:48:10,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:10,079 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 69 transitions. [2023-12-02 16:48:10,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 3 states have internal predecessors, (3), 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) [2023-12-02 16:48:10,079 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 69 transitions. [2023-12-02 16:48:10,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 16:48:10,080 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:10,080 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:10,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 16:48:10,081 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting alloc_and_zero_internalErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:10,081 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:10,081 INFO L85 PathProgramCache]: Analyzing trace with hash -1995356130, now seen corresponding path program 1 times [2023-12-02 16:48:10,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:10,082 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024248509] [2023-12-02 16:48:10,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:10,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:10,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:10,178 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:10,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:10,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024248509] [2023-12-02 16:48:10,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024248509] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:10,179 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:10,179 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:48:10,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136995457] [2023-12-02 16:48:10,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:10,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:48:10,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:10,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:48:10,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:48:10,182 INFO L87 Difference]: Start difference. First operand 63 states and 69 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 16:48:10,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:10,245 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2023-12-02 16:48:10,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:48:10,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-12-02 16:48:10,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:10,247 INFO L225 Difference]: With dead ends: 62 [2023-12-02 16:48:10,248 INFO L226 Difference]: Without dead ends: 62 [2023-12-02 16:48:10,248 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 [2023-12-02 16:48:10,250 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:10,250 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 85 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:10,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-12-02 16:48:10,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2023-12-02 16:48:10,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 32 states have (on average 1.875) internal successors, (60), 55 states have internal predecessors, (60), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:48:10,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-12-02 16:48:10,259 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 13 [2023-12-02 16:48:10,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:10,260 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-12-02 16:48:10,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 16:48:10,261 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-12-02 16:48:10,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 16:48:10,261 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:10,262 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:10,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 16:48:10,262 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting alloc_and_zero_internalErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:10,263 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:10,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1995356129, now seen corresponding path program 1 times [2023-12-02 16:48:10,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:10,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950244843] [2023-12-02 16:48:10,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:10,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:10,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:10,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:10,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:10,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950244843] [2023-12-02 16:48:10,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950244843] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:10,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:10,368 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:48:10,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48109169] [2023-12-02 16:48:10,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:10,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:48:10,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:10,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:48:10,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 16:48:10,370 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 16:48:10,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:10,423 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2023-12-02 16:48:10,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:48:10,424 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-12-02 16:48:10,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:10,425 INFO L225 Difference]: With dead ends: 61 [2023-12-02 16:48:10,425 INFO L226 Difference]: Without dead ends: 61 [2023-12-02 16:48:10,425 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 [2023-12-02 16:48:10,426 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 1 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:10,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 90 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:48:10,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-12-02 16:48:10,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-12-02 16:48:10,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 32 states have (on average 1.84375) internal successors, (59), 54 states have internal predecessors, (59), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 16:48:10,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2023-12-02 16:48:10,432 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 13 [2023-12-02 16:48:10,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:10,432 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2023-12-02 16:48:10,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 5.0) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 16:48:10,433 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2023-12-02 16:48:10,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 16:48:10,433 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:10,433 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:10,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 16:48:10,434 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:10,434 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:10,434 INFO L85 PathProgramCache]: Analyzing trace with hash -717837352, now seen corresponding path program 1 times [2023-12-02 16:48:10,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:10,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482985003] [2023-12-02 16:48:10,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:10,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:10,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:10,707 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:10,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:10,707 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482985003] [2023-12-02 16:48:10,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482985003] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:10,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319621601] [2023-12-02 16:48:10,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:10,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:10,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:10,712 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:10,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:48:10,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:10,803 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:48:10,812 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:10,861 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:10,903 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_~pi~0.base Int)) (and (= (select |c_old(#valid)| alloc_and_zero_~pi~0.base) 0) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_~pi~0.base (select |c_#valid| alloc_and_zero_~pi~0.base))))) is different from true [2023-12-02 16:48:10,948 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 16:48:10,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 16:48:10,956 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2023-12-02 16:48:10,956 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:11,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319621601] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:11,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2130237330] [2023-12-02 16:48:11,034 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 16:48:11,034 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:11,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:11,043 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:11,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:11,458 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 67 for LOIs [2023-12-02 16:48:11,599 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:13,180 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_create_~sll~1#1.offset| 0) (let ((.cse0 (exists ((|v_#memory_$Pointer$.offset_65| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_65| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_65| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)) |c_#memory_$Pointer$.offset|))) (.cse1 (<= (+ |c_ULTIMATE.start_create_~sll~1#1.base| 1) |c_#StackHeapBarrier|)) (.cse2 (= |c_ULTIMATE.start_create_~sll~1#1.base| |c_ULTIMATE.start_create_~now~1#1.base|)) (.cse3 (= (select |c_ULTIMATE.start_main_old_#valid#1| 0) 0)) (.cse4 (not (= |c_ULTIMATE.start_create_~sll~1#1.base| 0))) (.cse5 (not (= |c_ULTIMATE.start_create_#t~ret11#1.base| 0))) (.cse6 (<= 16 (select |c_#length| |c_ULTIMATE.start_create_#t~ret11#1.base|))) (.cse7 (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_12| Int)) (and (<= |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_12| 0))))) (.cse8 (<= (+ |c_ULTIMATE.start_create_#t~ret11#1.base| 1) |c_#StackHeapBarrier|)) (.cse9 (= (select |c_#valid| |c_ULTIMATE.start_create_#t~ret11#1.base|) 1))) (or (and .cse0 .cse1 .cse2 .cse3 (exists ((|v_#length_61| (Array Int Int))) (= |c_#length| (store |v_#length_61| |c_ULTIMATE.start_create_#t~ret11#1.base| 16))) .cse4 .cse5 (exists ((|v_#valid_81| (Array Int Int))) (and (= 0 (select |v_#valid_81| |c_ULTIMATE.start_create_#t~ret11#1.base|)) (= |c_#valid| (store |v_#valid_81| |c_ULTIMATE.start_create_#t~ret11#1.base| 1)))) .cse6 .cse7 (exists ((|v_#valid_79| (Array Int Int))) (= (select |v_#valid_79| |c_ULTIMATE.start_create_~sll~1#1.base|) 0)) .cse8 .cse9 (exists ((|v_#memory_$Pointer$.base_68| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_68| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_68| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0))))) (and .cse0 (exists ((|v_#valid_80| (Array Int Int))) (= (select |v_#valid_80| |c_ULTIMATE.start_create_~sll~1#1.base|) 0)) .cse1 .cse2 .cse3 (exists ((|v_#valid_79| (Array Int Int))) (and (= (select |v_#valid_79| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0) (= |c_#valid| (store |v_#valid_79| |c_ULTIMATE.start_create_#t~ret11#1.base| 1)))) .cse4 .cse5 (exists ((|v_#memory_$Pointer$.base_65| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_65| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_65| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)) |c_#memory_$Pointer$.base|)) .cse6 .cse7 (exists ((|v_#length_62| (Array Int Int))) (= |c_#length| (store |v_#length_62| |c_ULTIMATE.start_create_#t~ret11#1.base| 16))) .cse8 .cse9))) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_create_~now~1#1.offset| 0) (= |c_ULTIMATE.start_create_#t~ret11#1.offset| 0)) is different from true [2023-12-02 16:48:13,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '646#(and (not (= (select |#valid| |ULTIMATE.start_create_~now~1#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (or (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_65| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_65| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_65| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#valid_79| (Array Int Int))) (= (select |v_#valid_79| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (exists ((|v_#memory_$Pointer$.base_68| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_68| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_68| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (exists ((|v_#length_61| (Array Int Int))) (= |#length| (store |v_#length_61| |ULTIMATE.start_create_#t~ret11#1.base| 16))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_12| Int)) (and (<= |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_12| 0)))) (<= (+ |ULTIMATE.start_create_#t~ret11#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_81| (Array Int Int))) (and (= (select |v_#valid_81| |ULTIMATE.start_create_#t~ret11#1.base|) 0) (= (store |v_#valid_81| |ULTIMATE.start_create_#t~ret11#1.base| 1) |#valid|))) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|) (not (= |ULTIMATE.start_create_#t~ret11#1.base| 0))) (and (exists ((|v_#valid_80| (Array Int Int))) (= (select |v_#valid_80| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_65| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_65| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_65| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_65| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_65| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_65| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)) |#memory_$Pointer$.base|)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#length_62| (Array Int Int))) (= (store |v_#length_62| |ULTIMATE.start_create_#t~ret11#1.base| 16) |#length|)) (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_12| Int)) (and (<= |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_12| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_12| 0)))) (exists ((|v_#valid_79| (Array Int Int))) (and (= |#valid| (store |v_#valid_79| |ULTIMATE.start_create_#t~ret11#1.base| 1)) (= (select |v_#valid_79| |ULTIMATE.start_create_#t~ret11#1.base|) 0))) (<= (+ |ULTIMATE.start_create_#t~ret11#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|) (not (= |ULTIMATE.start_create_#t~ret11#1.base| 0)))) (= |ULTIMATE.start_create_#t~ret11#1.offset| 0) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-12-02 16:48:13,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:13,183 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:13,183 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-12-02 16:48:13,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442753527] [2023-12-02 16:48:13,183 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:13,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 16:48:13,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:13,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 16:48:13,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=315, Unknown=4, NotChecked=74, Total=462 [2023-12-02 16:48:13,185 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-12-02 16:48:13,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:13,484 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2023-12-02 16:48:13,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:48:13,485 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 15 [2023-12-02 16:48:13,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:13,486 INFO L225 Difference]: With dead ends: 66 [2023-12-02 16:48:13,486 INFO L226 Difference]: Without dead ends: 66 [2023-12-02 16:48:13,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=87, Invalid=379, Unknown=4, NotChecked=82, Total=552 [2023-12-02 16:48:13,487 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 8 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:13,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 224 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 276 Invalid, 0 Unknown, 71 Unchecked, 0.2s Time] [2023-12-02 16:48:13,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-12-02 16:48:13,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2023-12-02 16:48:13,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 35 states have (on average 1.8) internal successors, (63), 56 states have internal predecessors, (63), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:48:13,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2023-12-02 16:48:13,494 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 15 [2023-12-02 16:48:13,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:13,495 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2023-12-02 16:48:13,495 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-12-02 16:48:13,495 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2023-12-02 16:48:13,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 16:48:13,496 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:13,496 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:13,508 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:48:13,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:13,697 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:13,697 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:13,697 INFO L85 PathProgramCache]: Analyzing trace with hash -717837351, now seen corresponding path program 1 times [2023-12-02 16:48:13,697 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:13,698 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625976075] [2023-12-02 16:48:13,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:13,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:13,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:13,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:13,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:13,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625976075] [2023-12-02 16:48:13,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625976075] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:13,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [892568501] [2023-12-02 16:48:13,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:13,969 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:13,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:13,970 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:13,988 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:48:14,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:14,060 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 16:48:14,062 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:14,069 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:14,087 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:48:14,206 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_~pi~0.base Int)) (and (= (select |c_old(#valid)| alloc_and_zero_~pi~0.base) 0) (= (store |c_old(#length)| alloc_and_zero_~pi~0.base (select |c_#length| alloc_and_zero_~pi~0.base)) |c_#length|))) is different from true [2023-12-02 16:48:14,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:14,225 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-12-02 16:48:14,237 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:48:14,237 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:48:14,256 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2023-12-02 16:48:14,256 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:14,358 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [892568501] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:14,358 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092641731] [2023-12-02 16:48:14,360 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-12-02 16:48:14,361 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:14,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:14,361 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:14,361 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:14,521 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 67 for LOIs [2023-12-02 16:48:14,575 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:15,915 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_create_~sll~1#1.offset| 0) (<= 1 |c_#StackHeapBarrier|) (= |c_ULTIMATE.start_create_~now~1#1.offset| 0) (let ((.cse0 (<= (+ |c_ULTIMATE.start_create_~sll~1#1.base| 1) |c_#StackHeapBarrier|)) (.cse1 (= |c_ULTIMATE.start_create_~sll~1#1.base| |c_ULTIMATE.start_create_~now~1#1.base|)) (.cse2 (= (select |c_ULTIMATE.start_main_old_#valid#1| 0) 0)) (.cse3 (not (= |c_ULTIMATE.start_create_~sll~1#1.base| 0))) (.cse4 (not (= |c_ULTIMATE.start_create_#t~ret11#1.base| 0))) (.cse5 (<= 16 (select |c_#length| |c_ULTIMATE.start_create_#t~ret11#1.base|))) (.cse6 (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_13| Int)) (and (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_13| 0)) (<= |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483647)))) (.cse7 (exists ((|v_#valid_90| (Array Int Int))) (and (= 0 (select |v_#valid_90| |c_ULTIMATE.start_create_#t~ret11#1.base|)) (= |c_#valid| (store |v_#valid_90| |c_ULTIMATE.start_create_#t~ret11#1.base| 1))))) (.cse8 (<= (+ |c_ULTIMATE.start_create_#t~ret11#1.base| 1) |c_#StackHeapBarrier|)) (.cse9 (= (select |c_#valid| |c_ULTIMATE.start_create_#t~ret11#1.base|) 1))) (or (and (exists ((|v_#length_74| (Array Int Int))) (= |c_#length| (store |v_#length_74| |c_ULTIMATE.start_create_#t~ret11#1.base| 16))) .cse0 .cse1 .cse2 .cse3 .cse4 .cse5 (exists ((|v_#valid_91| (Array Int Int))) (= (select |v_#valid_91| |c_ULTIMATE.start_create_~sll~1#1.base|) 0)) .cse6 (exists ((|v_#memory_$Pointer$.offset_78| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_78| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_78| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (exists ((|v_#memory_$Pointer$.base_78| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_78| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_78| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) .cse7 .cse8 .cse9) (and .cse0 .cse1 (exists ((|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_79| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_79| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) .cse2 .cse3 .cse4 .cse5 (exists ((|v_#memory_$Pointer$.offset_76| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_76| |c_ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_76| |c_ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) .cse6 (exists ((|v_#length_75| (Array Int Int))) (= |c_#length| (store |v_#length_75| |c_ULTIMATE.start_create_#t~ret11#1.base| 16))) .cse7 (exists ((|v_#valid_92| (Array Int Int))) (= (select |v_#valid_92| |c_ULTIMATE.start_create_~sll~1#1.base|) 0)) .cse8 .cse9))) (= |c_ULTIMATE.start_create_#t~ret11#1.offset| 0)) is different from true [2023-12-02 16:48:15,916 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (or (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_78| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_78| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_78| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (exists ((|v_#length_74| (Array Int Int))) (= (store |v_#length_74| |ULTIMATE.start_create_#t~ret11#1.base| 16) |#length|)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_91| (Array Int Int))) (= (select |v_#valid_91| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_13| Int)) (and (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_13| 0)) (<= |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483647))) (<= (+ |ULTIMATE.start_create_#t~ret11#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_78| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_78| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_78| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|) (exists ((|v_#valid_90| (Array Int Int))) (and (= (select |v_#valid_90| |ULTIMATE.start_create_#t~ret11#1.base|) 0) (= (store |v_#valid_90| |ULTIMATE.start_create_#t~ret11#1.base| 1) |#valid|))) (not (= |ULTIMATE.start_create_#t~ret11#1.base| 0))) (and (<= (+ |ULTIMATE.start_create_~sll~1#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_76| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_76| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.offset_76| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)))) (not (= |ULTIMATE.start_create_~sll~1#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_79| |ULTIMATE.start_create_#t~ret11#1.base| (store (store (select |v_#memory_$Pointer$.base_79| |ULTIMATE.start_create_#t~ret11#1.base|) 0 0) 8 0)) |#memory_$Pointer$.base|)) (exists ((|v_#length_75| (Array Int Int))) (= (store |v_#length_75| |ULTIMATE.start_create_#t~ret11#1.base| 16) |#length|)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_92| (Array Int Int))) (= (select |v_#valid_92| |ULTIMATE.start_create_~sll~1#1.base|) 0)) (exists ((|v_ULTIMATE.start_create_#t~nondet10#1_13| Int)) (and (<= 0 (+ |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483648)) (not (= |v_ULTIMATE.start_create_#t~nondet10#1_13| 0)) (<= |v_ULTIMATE.start_create_#t~nondet10#1_13| 2147483647))) (<= (+ |ULTIMATE.start_create_#t~ret11#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_~now~1#1.base| |ULTIMATE.start_create_~sll~1#1.base|) (exists ((|v_#valid_90| (Array Int Int))) (and (= (select |v_#valid_90| |ULTIMATE.start_create_#t~ret11#1.base|) 0) (= (store |v_#valid_90| |ULTIMATE.start_create_#t~ret11#1.base| 1) |#valid|))) (not (= |ULTIMATE.start_create_#t~ret11#1.base| 0)))) (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_create_~now~1#1.base|) 7) (= |ULTIMATE.start_create_#t~ret11#1.offset| 0) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-12-02 16:48:15,916 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:15,916 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:15,916 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-12-02 16:48:15,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421699041] [2023-12-02 16:48:15,916 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:15,917 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-12-02 16:48:15,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:15,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-12-02 16:48:15,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=601, Unknown=3, NotChecked=102, Total=812 [2023-12-02 16:48:15,918 INFO L87 Difference]: Start difference. First operand 64 states and 73 transitions. Second operand has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:16,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:16,229 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2023-12-02 16:48:16,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:48:16,230 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 15 [2023-12-02 16:48:16,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:16,231 INFO L225 Difference]: With dead ends: 66 [2023-12-02 16:48:16,231 INFO L226 Difference]: Without dead ends: 66 [2023-12-02 16:48:16,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=127, Invalid=690, Unknown=3, NotChecked=110, Total=930 [2023-12-02 16:48:16,232 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 11 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:16,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 273 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 362 Invalid, 0 Unknown, 71 Unchecked, 0.2s Time] [2023-12-02 16:48:16,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-12-02 16:48:16,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2023-12-02 16:48:16,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 36 states have (on average 1.75) internal successors, (63), 57 states have internal predecessors, (63), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:48:16,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2023-12-02 16:48:16,239 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 15 [2023-12-02 16:48:16,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:16,239 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2023-12-02 16:48:16,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:16,239 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2023-12-02 16:48:16,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 16:48:16,240 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:16,240 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:16,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:48:16,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:16,441 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:16,441 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:16,442 INFO L85 PathProgramCache]: Analyzing trace with hash 112698123, now seen corresponding path program 1 times [2023-12-02 16:48:16,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:16,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676288569] [2023-12-02 16:48:16,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:16,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:16,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:16,611 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:16,612 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:16,612 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676288569] [2023-12-02 16:48:16,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676288569] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:16,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:16,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-12-02 16:48:16,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344529489] [2023-12-02 16:48:16,612 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:16,613 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 16:48:16,613 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:16,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 16:48:16,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:48:16,614 INFO L87 Difference]: Start difference. First operand 65 states and 73 transitions. Second operand has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:16,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:16,881 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2023-12-02 16:48:16,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:48:16,882 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2023-12-02 16:48:16,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:16,883 INFO L225 Difference]: With dead ends: 89 [2023-12-02 16:48:16,883 INFO L226 Difference]: Without dead ends: 89 [2023-12-02 16:48:16,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:48:16,884 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 53 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:16,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 207 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:48:16,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-12-02 16:48:16,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 66. [2023-12-02 16:48:16,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 38 states have (on average 1.736842105263158) internal successors, (66), 58 states have internal predecessors, (66), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:48:16,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2023-12-02 16:48:16,890 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 20 [2023-12-02 16:48:16,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:16,891 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2023-12-02 16:48:16,891 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.0) internal successors, (16), 9 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:16,891 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2023-12-02 16:48:16,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-12-02 16:48:16,892 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:16,892 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:16,892 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-12-02 16:48:16,892 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:16,893 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:16,893 INFO L85 PathProgramCache]: Analyzing trace with hash 112698124, now seen corresponding path program 1 times [2023-12-02 16:48:16,893 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:16,893 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798358067] [2023-12-02 16:48:16,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:16,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:16,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:17,228 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:17,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:17,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798358067] [2023-12-02 16:48:17,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798358067] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:17,228 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:17,228 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-12-02 16:48:17,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66655393] [2023-12-02 16:48:17,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:17,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 16:48:17,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:17,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 16:48:17,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:48:17,230 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 12 states, 8 states have (on average 2.0) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:17,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:17,560 INFO L93 Difference]: Finished difference Result 104 states and 120 transitions. [2023-12-02 16:48:17,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:48:17,561 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 8 states have (on average 2.0) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2023-12-02 16:48:17,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:17,563 INFO L225 Difference]: With dead ends: 104 [2023-12-02 16:48:17,563 INFO L226 Difference]: Without dead ends: 104 [2023-12-02 16:48:17,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2023-12-02 16:48:17,564 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 42 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:17,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 258 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:48:17,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-12-02 16:48:17,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 75. [2023-12-02 16:48:17,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 46 states have (on average 1.6521739130434783) internal successors, (76), 66 states have internal predecessors, (76), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:17,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 88 transitions. [2023-12-02 16:48:17,571 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 88 transitions. Word has length 20 [2023-12-02 16:48:17,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:17,572 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 88 transitions. [2023-12-02 16:48:17,572 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 8 states have (on average 2.0) internal successors, (16), 10 states have internal predecessors, (16), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:17,572 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 88 transitions. [2023-12-02 16:48:17,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 16:48:17,573 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:17,573 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:17,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-12-02 16:48:17,573 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:17,574 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:17,574 INFO L85 PathProgramCache]: Analyzing trace with hash -801234495, now seen corresponding path program 1 times [2023-12-02 16:48:17,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:17,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966386429] [2023-12-02 16:48:17,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:17,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:17,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:17,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:17,658 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:17,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966386429] [2023-12-02 16:48:17,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [966386429] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:17,658 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:17,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:48:17,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954324135] [2023-12-02 16:48:17,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:17,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:48:17,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:17,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:48:17,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:48:17,660 INFO L87 Difference]: Start difference. First operand 75 states and 88 transitions. Second operand has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:17,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:17,746 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2023-12-02 16:48:17,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:48:17,746 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-12-02 16:48:17,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:17,747 INFO L225 Difference]: With dead ends: 78 [2023-12-02 16:48:17,747 INFO L226 Difference]: Without dead ends: 78 [2023-12-02 16:48:17,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:48:17,748 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 52 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:17,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 278 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:17,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-12-02 16:48:17,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 75. [2023-12-02 16:48:17,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 46 states have (on average 1.608695652173913) internal successors, (74), 66 states have internal predecessors, (74), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:17,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 86 transitions. [2023-12-02 16:48:17,754 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 86 transitions. Word has length 21 [2023-12-02 16:48:17,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:17,754 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 86 transitions. [2023-12-02 16:48:17,754 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:17,754 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 86 transitions. [2023-12-02 16:48:17,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 16:48:17,755 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:17,756 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:17,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-12-02 16:48:17,756 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:17,756 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:17,756 INFO L85 PathProgramCache]: Analyzing trace with hash 983290782, now seen corresponding path program 1 times [2023-12-02 16:48:17,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:17,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248655402] [2023-12-02 16:48:17,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:17,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:17,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:17,869 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:17,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:17,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248655402] [2023-12-02 16:48:17,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248655402] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:17,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775919621] [2023-12-02 16:48:17,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:17,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:17,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:17,870 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:17,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:48:17,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:17,965 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:48:17,967 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:17,971 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:17,996 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base (select |c_#valid| alloc_and_zero_internal_~pi~1.base))) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-12-02 16:48:18,016 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 16:48:18,016 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 16:48:18,018 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-12-02 16:48:18,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:18,052 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775919621] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:18,052 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621463954] [2023-12-02 16:48:18,054 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 16:48:18,054 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:18,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:18,055 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:18,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:18,345 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 107 for LOIs [2023-12-02 16:48:18,391 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:18,402 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:20,849 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1620#(and (= |ULTIMATE.start_create_internal_#t~ret7#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_create_internal_~now~0#1.offset| 0) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (or (and (not (= |ULTIMATE.start_create_#res#1.base| 0)) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_12| Int)) (and (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 2147483648)) (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 0)) (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 2147483647))) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#memory_$Pointer$.base_89| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_89| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_89| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_#valid_102| (Array Int Int))) (= (select |v_#valid_102| |ULTIMATE.start_create_#res#1.base|) 0)) (exists ((|v_#valid_104| (Array Int Int))) (= (select |v_#valid_104| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#length_83| (Array Int Int))) (= |#length| (store |v_#length_83| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8))) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (exists ((|v_#valid_103| (Array Int Int))) (and (= 0 (select |v_#valid_103| |ULTIMATE.start_create_internal_#t~ret7#1.base|)) (= |#valid| (store |v_#valid_103| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)))) (exists ((|v_#memory_$Pointer$.offset_89| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_89| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_89| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|)) (and (exists ((|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_90| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_90| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_#res#1.base| 0)) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_12| Int)) (and (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 2147483648)) (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 0)) (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_12| 2147483647))) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (exists ((|v_#length_84| (Array Int Int))) (= |#length| (store |v_#length_84| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8))) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_105| (Array Int Int))) (= (select |v_#valid_105| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_90| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_90| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (exists ((|v_#valid_102| (Array Int Int))) (= (select |v_#valid_102| |ULTIMATE.start_create_#res#1.base|) 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (exists ((|v_#valid_103| (Array Int Int))) (and (= 0 (select |v_#valid_103| |ULTIMATE.start_create_internal_#t~ret7#1.base|)) (= |#valid| (store |v_#valid_103| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)))) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|))) (not (= (select |#valid| |ULTIMATE.start_create_internal_~now~0#1.base|) 1)) (= |ULTIMATE.start_create_internal_~sll~0#1.offset| 0))' at error location [2023-12-02 16:48:20,849 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:20,849 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:20,850 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-12-02 16:48:20,850 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352077006] [2023-12-02 16:48:20,850 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:20,850 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 16:48:20,850 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:20,851 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 16:48:20,851 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=625, Unknown=1, NotChecked=50, Total=756 [2023-12-02 16:48:20,852 INFO L87 Difference]: Start difference. First operand 75 states and 86 transitions. Second operand has 10 states, 7 states have (on average 2.857142857142857) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:21,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:21,084 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2023-12-02 16:48:21,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:48:21,084 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 7 states have (on average 2.857142857142857) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22 [2023-12-02 16:48:21,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:21,085 INFO L225 Difference]: With dead ends: 80 [2023-12-02 16:48:21,085 INFO L226 Difference]: Without dead ends: 80 [2023-12-02 16:48:21,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=95, Invalid=720, Unknown=1, NotChecked=54, Total=870 [2023-12-02 16:48:21,086 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 8 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:21,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 198 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 230 Invalid, 0 Unknown, 70 Unchecked, 0.1s Time] [2023-12-02 16:48:21,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-12-02 16:48:21,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2023-12-02 16:48:21,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 49 states have (on average 1.5918367346938775) internal successors, (78), 68 states have internal predecessors, (78), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:48:21,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2023-12-02 16:48:21,091 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 22 [2023-12-02 16:48:21,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:21,092 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2023-12-02 16:48:21,092 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 7 states have (on average 2.857142857142857) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:21,092 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2023-12-02 16:48:21,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 16:48:21,093 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:21,093 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:21,098 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 16:48:21,293 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 16:48:21,294 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:21,294 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:21,294 INFO L85 PathProgramCache]: Analyzing trace with hash 983290783, now seen corresponding path program 1 times [2023-12-02 16:48:21,294 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:21,294 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534686288] [2023-12-02 16:48:21,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:21,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:21,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:21,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:21,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:21,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534686288] [2023-12-02 16:48:21,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534686288] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:21,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190972113] [2023-12-02 16:48:21,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:21,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:21,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:21,543 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:21,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:48:21,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:21,645 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 16:48:21,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:21,653 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:21,772 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-12-02 16:48:21,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:21,791 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:48:21,800 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:48:21,801 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:48:21,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-12-02 16:48:21,817 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:21,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190972113] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:21,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [391222373] [2023-12-02 16:48:21,895 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-12-02 16:48:21,895 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:21,896 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:21,896 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:21,896 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:22,218 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 107 for LOIs [2023-12-02 16:48:22,276 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:22,300 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:24,908 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1885#(and (= |ULTIMATE.start_create_internal_#t~ret7#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_create_internal_~now~0#1.offset| 0) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (or (and (not (= |ULTIMATE.start_create_#res#1.base| 0)) (exists ((|v_#valid_115| (Array Int Int))) (= (select |v_#valid_115| |ULTIMATE.start_create_#res#1.base|) 0)) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_95| (Array Int Int))) (= |#length| (store |v_#length_95| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8))) (exists ((|v_#memory_$Pointer$.base_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_101| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_101| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#valid_116| (Array Int Int))) (= (select |v_#valid_116| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#memory_$Pointer$.offset_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (exists ((|v_#valid_117| (Array Int Int))) (and (= (select |v_#valid_117| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0) (= (store |v_#valid_117| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#valid|))) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_13| Int)) (and (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 0)) (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483648))))) (and (not (= |ULTIMATE.start_create_#res#1.base| 0)) (exists ((|v_#valid_115| (Array Int Int))) (= (select |v_#valid_115| |ULTIMATE.start_create_#res#1.base|) 0)) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_100| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_100| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (exists ((|v_#memory_$Pointer$.base_100| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_100| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_100| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (exists ((|v_#valid_116| (Array Int Int))) (and (= (store |v_#valid_116| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#valid|) (= (select |v_#valid_116| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0))) (exists ((|v_#length_97| (Array Int Int))) (= (store |v_#length_97| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8) |#length|)) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_118| (Array Int Int))) (= (select |v_#valid_118| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_13| Int)) (and (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 0)) (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483648)))))) (= |ULTIMATE.start_create_#res#1.offset| 0) (= |ULTIMATE.start_create_internal_~sll~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_create_internal_~now~0#1.base|) 7))' at error location [2023-12-02 16:48:24,909 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:24,909 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:24,909 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2023-12-02 16:48:24,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178155933] [2023-12-02 16:48:24,909 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:24,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 16:48:24,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:24,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 16:48:24,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=949, Unknown=3, NotChecked=62, Total=1122 [2023-12-02 16:48:24,911 INFO L87 Difference]: Start difference. First operand 78 states and 92 transitions. Second operand has 16 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:48:25,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:25,256 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2023-12-02 16:48:25,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:48:25,257 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 22 [2023-12-02 16:48:25,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:25,258 INFO L225 Difference]: With dead ends: 79 [2023-12-02 16:48:25,258 INFO L226 Difference]: Without dead ends: 79 [2023-12-02 16:48:25,258 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=126, Invalid=1065, Unknown=3, NotChecked=66, Total=1260 [2023-12-02 16:48:25,259 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 8 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 428 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:25,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 276 Invalid, 428 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 346 Invalid, 0 Unknown, 69 Unchecked, 0.2s Time] [2023-12-02 16:48:25,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-12-02 16:48:25,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2023-12-02 16:48:25,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 49 states have (on average 1.5510204081632653) internal successors, (76), 67 states have internal predecessors, (76), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:48:25,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 90 transitions. [2023-12-02 16:48:25,262 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 90 transitions. Word has length 22 [2023-12-02 16:48:25,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:25,263 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 90 transitions. [2023-12-02 16:48:25,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:48:25,263 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 90 transitions. [2023-12-02 16:48:25,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-12-02 16:48:25,263 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:25,264 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:25,268 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:48:25,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:25,464 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:25,465 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:25,465 INFO L85 PathProgramCache]: Analyzing trace with hash -1274515879, now seen corresponding path program 1 times [2023-12-02 16:48:25,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:25,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515677022] [2023-12-02 16:48:25,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:25,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:25,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:26,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:26,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515677022] [2023-12-02 16:48:26,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515677022] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:26,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62160560] [2023-12-02 16:48:26,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:26,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:26,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:26,037 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:26,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:48:26,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:26,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 56 conjunts are in the unsatisfiable core [2023-12-02 16:48:26,119 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:26,124 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:26,144 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 [2023-12-02 16:48:26,152 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 [2023-12-02 16:48:26,166 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 23 treesize of output 11 [2023-12-02 16:48:26,173 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 23 treesize of output 11 [2023-12-02 16:48:26,320 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.offset| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.offset|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0) (= (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.base| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.base|))) is different from true [2023-12-02 16:48:26,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:26,332 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:48:26,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:26,338 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:48:26,346 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:48:26,346 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:48:26,420 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-12-02 16:48:26,420 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 17 [2023-12-02 16:48:26,436 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-12-02 16:48:26,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 17 [2023-12-02 16:48:26,475 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:26,475 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:26,791 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62160560] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:26,791 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [752226187] [2023-12-02 16:48:26,793 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-12-02 16:48:26,793 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:26,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:26,794 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:26,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:27,143 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 52 for LOIs [2023-12-02 16:48:27,159 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:27,172 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:28,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2184#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_set_~x#1.base|) 1)) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= 0 |ULTIMATE.start_set_#in~x#1.offset|) (or (not (= |ULTIMATE.start_set_~x#1.base| 0)) (not (= |ULTIMATE.start_set_~x#1.offset| 0))) (= |ULTIMATE.start_set_~shared#1.offset| 0))' at error location [2023-12-02 16:48:28,919 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:28,919 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:28,919 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 23 [2023-12-02 16:48:28,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089319131] [2023-12-02 16:48:28,920 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:28,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 16:48:28,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:28,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 16:48:28,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=1746, Unknown=1, NotChecked=84, Total=1980 [2023-12-02 16:48:28,921 INFO L87 Difference]: Start difference. First operand 77 states and 90 transitions. Second operand has 23 states, 17 states have (on average 2.0) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:29,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:29,643 INFO L93 Difference]: Finished difference Result 79 states and 93 transitions. [2023-12-02 16:48:29,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 16:48:29,643 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 17 states have (on average 2.0) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 23 [2023-12-02 16:48:29,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:29,644 INFO L225 Difference]: With dead ends: 79 [2023-12-02 16:48:29,644 INFO L226 Difference]: Without dead ends: 79 [2023-12-02 16:48:29,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=190, Invalid=2165, Unknown=1, NotChecked=94, Total=2450 [2023-12-02 16:48:29,646 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 9 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:29,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 484 Invalid, 610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 516 Invalid, 0 Unknown, 81 Unchecked, 0.3s Time] [2023-12-02 16:48:29,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-12-02 16:48:29,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2023-12-02 16:48:29,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 50 states have (on average 1.54) internal successors, (77), 68 states have internal predecessors, (77), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:48:29,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 91 transitions. [2023-12-02 16:48:29,649 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 91 transitions. Word has length 23 [2023-12-02 16:48:29,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:29,650 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 91 transitions. [2023-12-02 16:48:29,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 17 states have (on average 2.0) internal successors, (34), 20 states have internal predecessors, (34), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:29,650 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 91 transitions. [2023-12-02 16:48:29,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 16:48:29,651 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:29,651 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:29,655 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:48:29,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:29,852 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:29,852 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:29,852 INFO L85 PathProgramCache]: Analyzing trace with hash -1978553128, now seen corresponding path program 1 times [2023-12-02 16:48:29,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:29,852 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799187433] [2023-12-02 16:48:29,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:29,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:29,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:30,060 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:48:30,060 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:30,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799187433] [2023-12-02 16:48:30,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799187433] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:30,061 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798383453] [2023-12-02 16:48:30,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:30,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:30,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:30,062 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:30,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:48:30,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:30,167 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 16:48:30,169 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:30,172 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:30,183 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:30,188 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 17 treesize of output 9 [2023-12-02 16:48:30,201 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_~pi~0.base Int)) (and (= (select |c_old(#valid)| alloc_and_zero_~pi~0.base) 0) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_~pi~0.base (select |c_#valid| alloc_and_zero_~pi~0.base))))) is different from true [2023-12-02 16:48:30,229 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 16:48:30,229 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 16:48:30,231 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2023-12-02 16:48:30,232 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:30,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798383453] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:30,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1078054636] [2023-12-02 16:48:30,278 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 16:48:30,278 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:30,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:30,279 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:30,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:30,759 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 22 for LOIs [2023-12-02 16:48:30,781 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:31,873 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2458#(and (not (= (select |#valid| |ULTIMATE.start_create_~now~1#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_create_#t~ret11#1.offset| 0) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-12-02 16:48:31,873 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:31,873 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:31,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2023-12-02 16:48:31,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860647478] [2023-12-02 16:48:31,873 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:31,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 16:48:31,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:31,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 16:48:31,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=438, Unknown=1, NotChecked=42, Total=552 [2023-12-02 16:48:31,875 INFO L87 Difference]: Start difference. First operand 78 states and 91 transitions. Second operand has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:32,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:32,110 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2023-12-02 16:48:32,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:48:32,110 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 24 [2023-12-02 16:48:32,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:32,111 INFO L225 Difference]: With dead ends: 77 [2023-12-02 16:48:32,111 INFO L226 Difference]: Without dead ends: 77 [2023-12-02 16:48:32,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=99, Invalid=606, Unknown=1, NotChecked=50, Total=756 [2023-12-02 16:48:32,112 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 9 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:32,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 250 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 268 Invalid, 0 Unknown, 66 Unchecked, 0.2s Time] [2023-12-02 16:48:32,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-12-02 16:48:32,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-12-02 16:48:32,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 50 states have (on average 1.52) internal successors, (76), 67 states have internal predecessors, (76), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-12-02 16:48:32,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 90 transitions. [2023-12-02 16:48:32,116 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 90 transitions. Word has length 24 [2023-12-02 16:48:32,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:32,116 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 90 transitions. [2023-12-02 16:48:32,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:32,116 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 90 transitions. [2023-12-02 16:48:32,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 16:48:32,117 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:32,118 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:32,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-02 16:48:32,319 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 16:48:32,320 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:32,320 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:32,320 INFO L85 PathProgramCache]: Analyzing trace with hash -1978553127, now seen corresponding path program 1 times [2023-12-02 16:48:32,320 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:32,320 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803792127] [2023-12-02 16:48:32,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:32,321 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:32,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:32,616 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:32,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:32,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803792127] [2023-12-02 16:48:32,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803792127] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:32,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319257880] [2023-12-02 16:48:32,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:32,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:32,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:32,617 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:32,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:48:32,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:32,701 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 16:48:32,703 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:32,706 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:32,767 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:32,771 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:32,795 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 32 treesize of output 20 [2023-12-02 16:48:32,799 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 26 treesize of output 14 [2023-12-02 16:48:32,836 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_~pi~0.base Int)) (and (= (select |c_old(#valid)| alloc_and_zero_~pi~0.base) 0) (= (store |c_old(#length)| alloc_and_zero_~pi~0.base (select |c_#length| alloc_and_zero_~pi~0.base)) |c_#length|))) is different from true [2023-12-02 16:48:32,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:32,850 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:48:32,859 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:48:32,859 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:48:32,879 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2023-12-02 16:48:32,879 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:32,988 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1319257880] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:32,989 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [79518047] [2023-12-02 16:48:32,990 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 16:48:32,990 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:32,991 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:32,991 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:32,991 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:33,458 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 22 for LOIs [2023-12-02 16:48:33,478 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:34,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2727#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_create_~now~1#1.base|) 7) (= |ULTIMATE.start_create_#t~ret11#1.offset| 0) (= |ULTIMATE.start_create_~now~1#1.offset| 0) (= |ULTIMATE.start_create_~sll~1#1.offset| 0))' at error location [2023-12-02 16:48:34,577 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:34,577 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:34,577 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2023-12-02 16:48:34,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795657030] [2023-12-02 16:48:34,577 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:34,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 16:48:34,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:34,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 16:48:34,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=831, Unknown=1, NotChecked=58, Total=992 [2023-12-02 16:48:34,579 INFO L87 Difference]: Start difference. First operand 77 states and 90 transitions. Second operand has 19 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:48:34,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:34,921 INFO L93 Difference]: Finished difference Result 75 states and 88 transitions. [2023-12-02 16:48:34,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 16:48:34,921 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 24 [2023-12-02 16:48:34,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:34,922 INFO L225 Difference]: With dead ends: 75 [2023-12-02 16:48:34,922 INFO L226 Difference]: Without dead ends: 75 [2023-12-02 16:48:34,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=140, Invalid=1052, Unknown=2, NotChecked=66, Total=1260 [2023-12-02 16:48:34,923 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:34,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 358 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 419 Invalid, 0 Unknown, 65 Unchecked, 0.2s Time] [2023-12-02 16:48:34,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-12-02 16:48:34,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2023-12-02 16:48:34,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.5) internal successors, (72), 63 states have internal predecessors, (72), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:34,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 84 transitions. [2023-12-02 16:48:34,927 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 84 transitions. Word has length 24 [2023-12-02 16:48:34,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:34,928 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 84 transitions. [2023-12-02 16:48:34,928 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (4), 2 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:48:34,928 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 84 transitions. [2023-12-02 16:48:34,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 16:48:34,929 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:34,929 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:34,934 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:48:35,129 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:35,130 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:35,130 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:35,130 INFO L85 PathProgramCache]: Analyzing trace with hash -855195597, now seen corresponding path program 1 times [2023-12-02 16:48:35,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:35,130 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280849491] [2023-12-02 16:48:35,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:35,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:35,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:35,198 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:35,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:35,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280849491] [2023-12-02 16:48:35,199 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280849491] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:35,199 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534507182] [2023-12-02 16:48:35,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:35,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:35,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:35,200 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:35,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:48:35,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:35,314 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 16:48:35,316 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:35,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:35,328 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:35,349 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-12-02 16:48:35,349 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2023-12-02 16:48:35,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:35,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534507182] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:48:35,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2119908823] [2023-12-02 16:48:35,361 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 16:48:35,361 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:35,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:35,362 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:35,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:35,750 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 50 for LOIs [2023-12-02 16:48:35,779 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:35,791 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:37,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3037#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_destroy_~l#1.base| 0)) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_destroy_#in~l#1.base|) (= |ULTIMATE.start_destroy_~l#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (not (= (select |#valid| |ULTIMATE.start_destroy_~l#1.base|) 1)) (= |ULTIMATE.start_destroy_#in~l#1.base| |ULTIMATE.start_destroy_~l#1.base|) (= |ULTIMATE.start_destroy_#in~l#1.offset| 0))' at error location [2023-12-02 16:48:37,314 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:37,314 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:48:37,314 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2023-12-02 16:48:37,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67465407] [2023-12-02 16:48:37,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:37,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:48:37,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:37,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:48:37,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2023-12-02 16:48:37,316 INFO L87 Difference]: Start difference. First operand 72 states and 84 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:48:37,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:37,402 INFO L93 Difference]: Finished difference Result 94 states and 106 transitions. [2023-12-02 16:48:37,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 16:48:37,402 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2023-12-02 16:48:37,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:37,403 INFO L225 Difference]: With dead ends: 94 [2023-12-02 16:48:37,404 INFO L226 Difference]: Without dead ends: 94 [2023-12-02 16:48:37,404 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=66, Invalid=690, Unknown=0, NotChecked=0, Total=756 [2023-12-02 16:48:37,404 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 39 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:37,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 114 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:37,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-12-02 16:48:37,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 73. [2023-12-02 16:48:37,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 50 states have (on average 1.5) internal successors, (75), 64 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:37,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2023-12-02 16:48:37,409 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 24 [2023-12-02 16:48:37,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:37,409 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2023-12-02 16:48:37,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:48:37,409 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2023-12-02 16:48:37,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 16:48:37,416 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:37,416 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:37,420 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:48:37,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 16:48:37,616 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:37,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:37,617 INFO L85 PathProgramCache]: Analyzing trace with hash -855195596, now seen corresponding path program 1 times [2023-12-02 16:48:37,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:37,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279884811] [2023-12-02 16:48:37,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:37,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:37,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:37,804 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:37,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:37,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279884811] [2023-12-02 16:48:37,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279884811] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:37,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090507354] [2023-12-02 16:48:37,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:37,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:37,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:37,806 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:37,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:48:37,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:37,921 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 16:48:37,923 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:37,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:37,985 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:38,051 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:48:38,052 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 16:48:38,203 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:38,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090507354] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:48:38,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008961829] [2023-12-02 16:48:38,206 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 16:48:38,206 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:38,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:38,206 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:38,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:38,709 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 54 for LOIs [2023-12-02 16:48:38,725 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:38,734 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:40,364 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3387#(and (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_destroy_~l#1.base| 0)) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_destroy_#in~l#1.base|) (= |ULTIMATE.start_destroy_~l#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= |ULTIMATE.start_destroy_#in~l#1.base| |ULTIMATE.start_destroy_~l#1.base|) (<= (select |#length| |ULTIMATE.start_destroy_~l#1.base|) 7) (= |ULTIMATE.start_destroy_#in~l#1.offset| 0))' at error location [2023-12-02 16:48:40,364 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:40,364 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:48:40,364 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2023-12-02 16:48:40,364 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329677507] [2023-12-02 16:48:40,364 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:40,364 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-12-02 16:48:40,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:40,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-12-02 16:48:40,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1647, Unknown=0, NotChecked=0, Total=1806 [2023-12-02 16:48:40,366 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 22 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 20 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:40,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:40,586 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2023-12-02 16:48:40,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 16:48:40,586 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 20 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2023-12-02 16:48:40,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:40,587 INFO L225 Difference]: With dead ends: 79 [2023-12-02 16:48:40,587 INFO L226 Difference]: Without dead ends: 79 [2023-12-02 16:48:40,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=184, Invalid=1886, Unknown=0, NotChecked=0, Total=2070 [2023-12-02 16:48:40,588 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 203 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:40,588 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 353 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 374 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:48:40,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-12-02 16:48:40,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 75. [2023-12-02 16:48:40,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 66 states have internal predecessors, (76), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:40,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 88 transitions. [2023-12-02 16:48:40,592 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 88 transitions. Word has length 24 [2023-12-02 16:48:40,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:40,592 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 88 transitions. [2023-12-02 16:48:40,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 20 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:48:40,592 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 88 transitions. [2023-12-02 16:48:40,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 16:48:40,593 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:40,593 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:40,599 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:48:40,793 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 16:48:40,794 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:40,794 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:40,794 INFO L85 PathProgramCache]: Analyzing trace with hash -741185925, now seen corresponding path program 1 times [2023-12-02 16:48:40,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:40,794 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635852244] [2023-12-02 16:48:40,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:40,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:40,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:40,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:40,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635852244] [2023-12-02 16:48:40,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635852244] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:40,864 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:40,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:48:40,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554687105] [2023-12-02 16:48:40,865 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:40,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:48:40,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:40,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:48:40,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:48:40,866 INFO L87 Difference]: Start difference. First operand 75 states and 88 transitions. Second operand has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:40,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:40,953 INFO L93 Difference]: Finished difference Result 78 states and 90 transitions. [2023-12-02 16:48:40,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:48:40,953 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2023-12-02 16:48:40,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:40,954 INFO L225 Difference]: With dead ends: 78 [2023-12-02 16:48:40,954 INFO L226 Difference]: Without dead ends: 78 [2023-12-02 16:48:40,955 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:48:40,955 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 46 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:40,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 231 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:40,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-12-02 16:48:40,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 75. [2023-12-02 16:48:40,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 52 states have (on average 1.4423076923076923) internal successors, (75), 66 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:40,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 87 transitions. [2023-12-02 16:48:40,959 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 87 transitions. Word has length 25 [2023-12-02 16:48:40,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:40,960 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 87 transitions. [2023-12-02 16:48:40,960 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:40,960 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 87 transitions. [2023-12-02 16:48:40,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 16:48:40,960 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:40,961 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:40,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-12-02 16:48:40,961 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr15ASSERT_VIOLATIONMEMORY_FREE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:40,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:40,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1504156242, now seen corresponding path program 1 times [2023-12-02 16:48:40,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:40,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118320838] [2023-12-02 16:48:40,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:40,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:40,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:41,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:41,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:41,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118320838] [2023-12-02 16:48:41,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118320838] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:48:41,048 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:48:41,048 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 16:48:41,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823230580] [2023-12-02 16:48:41,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:48:41,048 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:48:41,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:41,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:48:41,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:48:41,049 INFO L87 Difference]: Start difference. First operand 75 states and 87 transitions. Second operand has 8 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:41,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:41,175 INFO L93 Difference]: Finished difference Result 76 states and 88 transitions. [2023-12-02 16:48:41,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:48:41,175 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2023-12-02 16:48:41,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:41,176 INFO L225 Difference]: With dead ends: 76 [2023-12-02 16:48:41,176 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 16:48:41,177 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:48:41,177 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 40 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:41,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 169 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:48:41,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 16:48:41,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2023-12-02 16:48:41,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 53 states have (on average 1.4339622641509433) internal successors, (76), 67 states have internal predecessors, (76), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:41,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2023-12-02 16:48:41,181 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 26 [2023-12-02 16:48:41,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:41,181 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2023-12-02 16:48:41,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 7 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 16:48:41,181 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2023-12-02 16:48:41,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 16:48:41,182 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:41,182 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:41,182 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-12-02 16:48:41,182 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:41,183 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:41,183 INFO L85 PathProgramCache]: Analyzing trace with hash 657829439, now seen corresponding path program 1 times [2023-12-02 16:48:41,183 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:41,183 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129547322] [2023-12-02 16:48:41,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:41,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:41,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:41,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:41,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:41,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129547322] [2023-12-02 16:48:41,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129547322] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:41,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1142838889] [2023-12-02 16:48:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:41,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:41,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:41,581 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:41,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 16:48:41,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:41,692 INFO L262 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 61 conjunts are in the unsatisfiable core [2023-12-02 16:48:41,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:41,702 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:41,706 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:48:41,921 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-12-02 16:48:41,921 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 16:48:41,930 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-12-02 16:48:42,033 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-12-02 16:48:42,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:42,050 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-12-02 16:48:42,064 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-12-02 16:48:42,064 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-12-02 16:48:42,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-12-02 16:48:42,122 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:42,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1142838889] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:42,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [410590109] [2023-12-02 16:48:42,274 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-12-02 16:48:42,275 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:42,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:42,275 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:42,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:43,203 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 55 for LOIs [2023-12-02 16:48:43,234 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:43,245 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:46,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4032#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_set_#in~shared#1.base| |ULTIMATE.start_main_~shared~0#1.base|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (not (= |ULTIMATE.start_set_~x#1.base| 0)) (= |ULTIMATE.start_set_~x#1.base| |ULTIMATE.start_set_#in~x#1.base|) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_set_#in~x#1.base|) (<= (select |#length| |ULTIMATE.start_set_~x#1.base|) 15) (= |ULTIMATE.start_create_#res#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.base| |ULTIMATE.start_main_~shared~0#1.base|) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= 0 |ULTIMATE.start_set_#in~x#1.offset|) (= |ULTIMATE.start_set_~shared#1.offset| 0) (= |ULTIMATE.start_set_~shared#1.base| |ULTIMATE.start_set_#in~shared#1.base|) (= |ULTIMATE.start_set_~x#1.offset| 0))' at error location [2023-12-02 16:48:46,085 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:46,085 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:46,085 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2023-12-02 16:48:46,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348509020] [2023-12-02 16:48:46,085 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:46,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:48:46,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:46,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:48:46,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=2257, Unknown=1, NotChecked=96, Total=2550 [2023-12-02 16:48:46,087 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand has 27 states, 20 states have (on average 2.15) internal successors, (43), 23 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 16:48:46,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:46,663 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2023-12-02 16:48:46,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:48:46,663 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 20 states have (on average 2.15) internal successors, (43), 23 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 28 [2023-12-02 16:48:46,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:46,664 INFO L225 Difference]: With dead ends: 77 [2023-12-02 16:48:46,664 INFO L226 Difference]: Without dead ends: 77 [2023-12-02 16:48:46,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=259, Invalid=2824, Unknown=1, NotChecked=108, Total=3192 [2023-12-02 16:48:46,665 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:46,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 271 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 544 Invalid, 0 Unknown, 65 Unchecked, 0.3s Time] [2023-12-02 16:48:46,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-12-02 16:48:46,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2023-12-02 16:48:46,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 53 states have (on average 1.4150943396226414) internal successors, (75), 67 states have internal predecessors, (75), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:46,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2023-12-02 16:48:46,668 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 28 [2023-12-02 16:48:46,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:46,668 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2023-12-02 16:48:46,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 20 states have (on average 2.15) internal successors, (43), 23 states have internal predecessors, (43), 4 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 16:48:46,669 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2023-12-02 16:48:46,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:48:46,669 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:46,669 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:46,674 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 16:48:46,869 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:46,870 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:46,870 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:46,870 INFO L85 PathProgramCache]: Analyzing trace with hash 868474385, now seen corresponding path program 1 times [2023-12-02 16:48:46,870 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:46,871 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17072892] [2023-12-02 16:48:46,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:46,871 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:46,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:47,028 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:47,028 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:47,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17072892] [2023-12-02 16:48:47,028 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17072892] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:47,028 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505040182] [2023-12-02 16:48:47,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:47,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:47,029 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:47,030 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:47,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 16:48:47,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:47,158 INFO L262 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 16:48:47,159 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:47,162 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:47,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:47,175 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 17 treesize of output 9 [2023-12-02 16:48:47,186 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base (select |c_#valid| alloc_and_zero_internal_~pi~1.base))) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-12-02 16:48:47,205 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-12-02 16:48:47,205 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-12-02 16:48:47,207 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-12-02 16:48:47,207 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:47,246 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505040182] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:47,246 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1300382256] [2023-12-02 16:48:47,248 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-12-02 16:48:47,248 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:47,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:47,248 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:47,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:48,003 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 57 for LOIs [2023-12-02 16:48:48,023 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:48,031 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:50,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4324#(and (= |ULTIMATE.start_create_internal_#t~ret7#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (exists ((|v_#valid_201| (Array Int Int))) (and (= (store |v_#valid_201| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#valid|) (= (select |v_#valid_201| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0))) (exists ((|v_#length_170| (Array Int Int))) (= (store |v_#length_170| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8) |#length|)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (= |ULTIMATE.start_create_#res#1.offset| 0) (exists ((|v_#memory_$Pointer$.base_221| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_221| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_221| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)) |#memory_$Pointer$.base|)) (not (= (select |#valid| |ULTIMATE.start_create_internal_~now~0#1.base|) 1)) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (= |ULTIMATE.start_create_internal_~sll~0#1.offset| 0) (exists ((|v_#memory_$Pointer$.offset_219| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_219| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_219| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))))' at error location [2023-12-02 16:48:50,525 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:50,526 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:50,526 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2023-12-02 16:48:50,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986874625] [2023-12-02 16:48:50,526 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:50,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-12-02 16:48:50,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:50,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-12-02 16:48:50,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=777, Unknown=1, NotChecked=56, Total=930 [2023-12-02 16:48:50,527 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand has 11 states, 8 states have (on average 3.0) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:48:50,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:50,786 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2023-12-02 16:48:50,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:48:50,786 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 3.0) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 30 [2023-12-02 16:48:50,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:50,787 INFO L225 Difference]: With dead ends: 76 [2023-12-02 16:48:50,787 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 16:48:50,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 221 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=122, Invalid=1003, Unknown=1, NotChecked=64, Total=1190 [2023-12-02 16:48:50,788 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 7 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:50,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 240 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 252 Invalid, 0 Unknown, 63 Unchecked, 0.1s Time] [2023-12-02 16:48:50,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 16:48:50,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2023-12-02 16:48:50,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 53 states have (on average 1.3962264150943395) internal successors, (74), 66 states have internal predecessors, (74), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:48:50,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 86 transitions. [2023-12-02 16:48:50,791 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 86 transitions. Word has length 30 [2023-12-02 16:48:50,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:50,791 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 86 transitions. [2023-12-02 16:48:50,791 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 3.0) internal successors, (24), 9 states have internal predecessors, (24), 2 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-12-02 16:48:50,792 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 86 transitions. [2023-12-02 16:48:50,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:48:50,792 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:50,792 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:50,798 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 16:48:50,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:50,993 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:50,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:50,993 INFO L85 PathProgramCache]: Analyzing trace with hash 868474386, now seen corresponding path program 1 times [2023-12-02 16:48:50,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:50,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936093686] [2023-12-02 16:48:50,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:50,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:51,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:51,306 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:51,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:51,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936093686] [2023-12-02 16:48:51,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936093686] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:51,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562064876] [2023-12-02 16:48:51,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:51,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:51,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:51,308 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:51,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 16:48:51,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:51,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 16:48:51,434 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:51,439 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:51,502 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:51,507 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:48:51,534 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 32 treesize of output 20 [2023-12-02 16:48:51,537 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 26 treesize of output 14 [2023-12-02 16:48:51,592 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0))) is different from true [2023-12-02 16:48:51,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:48:51,602 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:48:51,607 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:48:51,607 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:48:51,626 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-12-02 16:48:51,627 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:51,695 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562064876] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:51,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140008215] [2023-12-02 16:48:51,697 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-12-02 16:48:51,697 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:51,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:51,697 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:51,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:52,511 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 55 for LOIs [2023-12-02 16:48:52,532 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:52,540 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:54,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4614#(and (exists ((|v_#memory_$Pointer$.base_238| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_238| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_238| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= |ULTIMATE.start_create_internal_#t~ret7#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_236| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_236| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_236| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= |ULTIMATE.start_create_#res#1.offset| 0) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (or (< |ULTIMATE.start_create_internal_~now~0#1.offset| 0) (< (select |#length| |ULTIMATE.start_create_internal_~now~0#1.base|) (+ |ULTIMATE.start_create_internal_~now~0#1.offset| 8))) (exists ((|v_#valid_214| (Array Int Int))) (and (= (select |v_#valid_214| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0) (= |#valid| (store |v_#valid_214| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)))) (exists ((|v_#length_183| (Array Int Int))) (= |#length| (store |v_#length_183| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8))) (= |ULTIMATE.start_create_internal_~sll~0#1.offset| 0))' at error location [2023-12-02 16:48:54,882 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:54,882 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:48:54,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 17 [2023-12-02 16:48:54,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435967125] [2023-12-02 16:48:54,882 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:54,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 16:48:54,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:54,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 16:48:54,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1213, Unknown=1, NotChecked=70, Total=1406 [2023-12-02 16:48:54,884 INFO L87 Difference]: Start difference. First operand 75 states and 86 transitions. Second operand has 18 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2023-12-02 16:48:55,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:55,312 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2023-12-02 16:48:55,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:48:55,313 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 30 [2023-12-02 16:48:55,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:55,314 INFO L225 Difference]: With dead ends: 76 [2023-12-02 16:48:55,314 INFO L226 Difference]: Without dead ends: 76 [2023-12-02 16:48:55,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=179, Invalid=1716, Unknown=1, NotChecked=84, Total=1980 [2023-12-02 16:48:55,315 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 6 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:55,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 446 Invalid, 495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 423 Invalid, 0 Unknown, 63 Unchecked, 0.2s Time] [2023-12-02 16:48:55,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-12-02 16:48:55,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 70. [2023-12-02 16:48:55,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 50 states have (on average 1.38) internal successors, (69), 62 states have internal predecessors, (69), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:48:55,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 79 transitions. [2023-12-02 16:48:55,319 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 79 transitions. Word has length 30 [2023-12-02 16:48:55,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:55,319 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 79 transitions. [2023-12-02 16:48:55,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 5 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2023-12-02 16:48:55,319 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 79 transitions. [2023-12-02 16:48:55,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 16:48:55,319 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:55,320 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:55,324 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 16:48:55,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 16:48:55,520 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:55,520 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:55,520 INFO L85 PathProgramCache]: Analyzing trace with hash -924673509, now seen corresponding path program 1 times [2023-12-02 16:48:55,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:55,520 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409169557] [2023-12-02 16:48:55,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:55,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:55,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:55,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:55,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:55,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409169557] [2023-12-02 16:48:55,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409169557] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:55,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071904282] [2023-12-02 16:48:55,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:55,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:55,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:55,669 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:55,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 16:48:55,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:55,804 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 51 conjunts are in the unsatisfiable core [2023-12-02 16:48:55,806 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:55,939 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:48:55,940 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 15 treesize of output 15 [2023-12-02 16:48:55,947 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:48:55,947 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 15 treesize of output 15 [2023-12-02 16:48:55,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:55,989 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:48:56,082 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-12-02 16:48:56,082 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 24 treesize of output 23 [2023-12-02 16:48:56,088 INFO L349 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-12-02 16:48:56,089 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 20 treesize of output 12 [2023-12-02 16:48:56,127 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:48:56,127 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071904282] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:48:56,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [707563744] [2023-12-02 16:48:56,129 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2023-12-02 16:48:56,129 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:48:56,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:48:56,129 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:48:56,130 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:48:56,563 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 50 for LOIs [2023-12-02 16:48:56,578 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:48:56,598 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:48:58,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4980#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (not (= (select |#valid| |ULTIMATE.start_destroy_~l#1.base|) 1)) (or (not (= |ULTIMATE.start_destroy_~l#1.base| 0)) (not (= |ULTIMATE.start_destroy_~l#1.offset| 0))) (= |ULTIMATE.start_destroy_#in~l#1.offset| 0))' at error location [2023-12-02 16:48:58,703 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:48:58,703 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:48:58,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 13, 13] total 18 [2023-12-02 16:48:58,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616352540] [2023-12-02 16:48:58,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:48:58,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-12-02 16:48:58,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:48:58,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-12-02 16:48:58,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1598, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 16:48:58,705 INFO L87 Difference]: Start difference. First operand 70 states and 79 transitions. Second operand has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:59,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:48:59,153 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-12-02 16:48:59,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 16:48:59,154 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2023-12-02 16:48:59,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:48:59,154 INFO L225 Difference]: With dead ends: 92 [2023-12-02 16:48:59,154 INFO L226 Difference]: Without dead ends: 92 [2023-12-02 16:48:59,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=180, Invalid=2270, Unknown=0, NotChecked=0, Total=2450 [2023-12-02 16:48:59,156 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 101 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 470 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:48:59,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 470 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:48:59,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-12-02 16:48:59,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 77. [2023-12-02 16:48:59,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 57 states have (on average 1.3508771929824561) internal successors, (77), 69 states have internal predecessors, (77), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:48:59,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2023-12-02 16:48:59,159 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 29 [2023-12-02 16:48:59,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:48:59,160 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2023-12-02 16:48:59,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.764705882352941) internal successors, (47), 17 states have internal predecessors, (47), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-12-02 16:48:59,160 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2023-12-02 16:48:59,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:48:59,160 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:48:59,160 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:48:59,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 16:48:59,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:59,361 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:48:59,361 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:48:59,361 INFO L85 PathProgramCache]: Analyzing trace with hash 1399966099, now seen corresponding path program 1 times [2023-12-02 16:48:59,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:48:59,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997934497] [2023-12-02 16:48:59,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:59,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:48:59,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:59,577 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:59,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:48:59,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997934497] [2023-12-02 16:48:59,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997934497] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:48:59,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745452545] [2023-12-02 16:48:59,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:48:59,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:48:59,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:48:59,579 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:48:59,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 16:48:59,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:48:59,681 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 44 conjunts are in the unsatisfiable core [2023-12-02 16:48:59,683 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:48:59,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:48:59,745 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-12-02 16:48:59,746 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 16:48:59,861 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 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 19 treesize of output 12 [2023-12-02 16:48:59,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:48:59,864 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:00,100 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:49:00,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745452545] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:49:00,101 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2129716807] [2023-12-02 16:49:00,102 INFO L159 IcfgInterpreter]: Started Sifa with 29 locations of interest [2023-12-02 16:49:00,102 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:00,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:00,103 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:00,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:00,530 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 50 for LOIs [2023-12-02 16:49:00,539 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:49:00,553 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:49:02,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5393#(and (not (= (select |#valid| |ULTIMATE.start_destroy_internal_~l#1.base|) 1)) (= |ULTIMATE.start_destroy_internal_#in~l#1.base| |ULTIMATE.start_main_~shared~0#1.base|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= |ULTIMATE.start_destroy_internal_~l#1.offset| 0) (= |ULTIMATE.start_destroy_internal_~l#1.base| |ULTIMATE.start_destroy_internal_#in~l#1.base|) (not (= |ULTIMATE.start_destroy_internal_~l#1.base| 0)) (= |ULTIMATE.start_destroy_internal_#in~l#1.offset| 0))' at error location [2023-12-02 16:49:02,820 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:49:02,820 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:49:02,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-12-02 16:49:02,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549630483] [2023-12-02 16:49:02,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:49:02,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-12-02 16:49:02,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:02,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-12-02 16:49:02,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2891, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 16:49:02,823 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 30 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:49:03,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:03,464 INFO L93 Difference]: Finished difference Result 123 states and 139 transitions. [2023-12-02 16:49:03,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2023-12-02 16:49:03,465 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 30 [2023-12-02 16:49:03,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:03,466 INFO L225 Difference]: With dead ends: 123 [2023-12-02 16:49:03,466 INFO L226 Difference]: Without dead ends: 123 [2023-12-02 16:49:03,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=273, Invalid=4149, Unknown=0, NotChecked=0, Total=4422 [2023-12-02 16:49:03,467 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 120 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 664 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 664 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:03,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 282 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 664 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:49:03,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-12-02 16:49:03,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 80. [2023-12-02 16:49:03,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 61 states have (on average 1.360655737704918) internal successors, (83), 72 states have internal predecessors, (83), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:49:03,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 93 transitions. [2023-12-02 16:49:03,471 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 93 transitions. Word has length 30 [2023-12-02 16:49:03,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:03,472 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 93 transitions. [2023-12-02 16:49:03,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:49:03,472 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 93 transitions. [2023-12-02 16:49:03,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:49:03,472 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:03,472 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:03,477 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 16:49:03,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:03,673 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:03,673 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:03,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1399966100, now seen corresponding path program 1 times [2023-12-02 16:49:03,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:03,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762649479] [2023-12-02 16:49:03,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:03,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:03,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:03,810 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:49:03,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:03,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762649479] [2023-12-02 16:49:03,811 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762649479] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:49:03,811 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:49:03,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 16:49:03,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22400332] [2023-12-02 16:49:03,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:49:03,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:49:03,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:03,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:49:03,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:49:03,812 INFO L87 Difference]: Start difference. First operand 80 states and 93 transitions. Second operand has 8 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:03,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:03,977 INFO L93 Difference]: Finished difference Result 135 states and 156 transitions. [2023-12-02 16:49:03,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:49:03,977 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2023-12-02 16:49:03,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:03,978 INFO L225 Difference]: With dead ends: 135 [2023-12-02 16:49:03,978 INFO L226 Difference]: Without dead ends: 135 [2023-12-02 16:49:03,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:49:03,979 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 33 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:03,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 204 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:49:03,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2023-12-02 16:49:03,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 112. [2023-12-02 16:49:03,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 93 states have (on average 1.3978494623655915) internal successors, (130), 104 states have internal predecessors, (130), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:49:03,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 140 transitions. [2023-12-02 16:49:03,983 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 140 transitions. Word has length 30 [2023-12-02 16:49:03,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:03,984 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 140 transitions. [2023-12-02 16:49:03,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:03,984 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 140 transitions. [2023-12-02 16:49:03,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 16:49:03,984 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:03,984 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:03,984 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-12-02 16:49:03,985 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:03,985 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:03,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1399967632, now seen corresponding path program 1 times [2023-12-02 16:49:03,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:03,985 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068740545] [2023-12-02 16:49:03,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:03,985 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:03,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:04,053 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:49:04,053 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:04,053 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068740545] [2023-12-02 16:49:04,053 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068740545] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:49:04,053 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:49:04,053 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:49:04,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [192883866] [2023-12-02 16:49:04,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:49:04,054 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:49:04,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:04,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:49:04,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:49:04,055 INFO L87 Difference]: Start difference. First operand 112 states and 140 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:04,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:04,133 INFO L93 Difference]: Finished difference Result 121 states and 146 transitions. [2023-12-02 16:49:04,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:49:04,134 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 30 [2023-12-02 16:49:04,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:04,135 INFO L225 Difference]: With dead ends: 121 [2023-12-02 16:49:04,135 INFO L226 Difference]: Without dead ends: 121 [2023-12-02 16:49:04,135 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:49:04,136 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 37 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:04,136 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 231 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:49:04,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2023-12-02 16:49:04,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 113. [2023-12-02 16:49:04,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 94 states have (on average 1.3617021276595744) internal successors, (128), 105 states have internal predecessors, (128), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 16:49:04,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 138 transitions. [2023-12-02 16:49:04,140 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 138 transitions. Word has length 30 [2023-12-02 16:49:04,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:04,140 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 138 transitions. [2023-12-02 16:49:04,140 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 7 states have internal predecessors, (26), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:04,140 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 138 transitions. [2023-12-02 16:49:04,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-12-02 16:49:04,141 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:04,141 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:04,141 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-12-02 16:49:04,141 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:04,141 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:04,141 INFO L85 PathProgramCache]: Analyzing trace with hash -538856890, now seen corresponding path program 1 times [2023-12-02 16:49:04,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:04,142 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240235932] [2023-12-02 16:49:04,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:04,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:04,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:04,880 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:49:04,880 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:04,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240235932] [2023-12-02 16:49:04,880 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240235932] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:04,880 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003499557] [2023-12-02 16:49:04,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:04,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:04,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:49:04,881 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:49:04,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 16:49:05,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:05,012 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 76 conjunts are in the unsatisfiable core [2023-12-02 16:49:05,015 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:49:05,018 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:49:05,042 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 16:49:05,048 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 [2023-12-02 16:49:05,058 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 23 treesize of output 11 [2023-12-02 16:49:05,062 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 23 treesize of output 11 [2023-12-02 16:49:05,248 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:49:05,248 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:49:05,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:49:05,256 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:49:05,361 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (store (select |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base) 0 0))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base (store (select |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base) 0 0))))) is different from true [2023-12-02 16:49:05,374 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-12-02 16:49:05,374 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 16:49:05,385 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-12-02 16:49:05,386 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 16:49:05,432 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:49:05,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:49:05,531 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-12-02 16:49:05,532 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 17 [2023-12-02 16:49:05,546 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-12-02 16:49:05,546 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 17 [2023-12-02 16:49:05,593 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2023-12-02 16:49:05,593 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:07,007 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003499557] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:07,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975664819] [2023-12-02 16:49:07,008 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 16:49:07,008 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:07,008 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:07,008 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:07,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:07,861 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 53 for LOIs [2023-12-02 16:49:07,878 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:49:07,887 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:49:10,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6311#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_set_~x#1.base|) 1)) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= 0 |ULTIMATE.start_set_#in~x#1.offset|) (or (not (= |ULTIMATE.start_set_~x#1.base| 0)) (not (= |ULTIMATE.start_set_~x#1.offset| 0))) (= |ULTIMATE.start_set_~shared#1.offset| 0))' at error location [2023-12-02 16:49:10,978 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:49:10,978 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:49:10,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 34 [2023-12-02 16:49:10,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889521148] [2023-12-02 16:49:10,978 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:49:10,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-12-02 16:49:10,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:10,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-12-02 16:49:10,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=3203, Unknown=8, NotChecked=114, Total=3540 [2023-12-02 16:49:10,980 INFO L87 Difference]: Start difference. First operand 113 states and 138 transitions. Second operand has 34 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 27 states have internal predecessors, (46), 5 states have call successors, (5), 3 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:11,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:11,713 INFO L93 Difference]: Finished difference Result 154 states and 184 transitions. [2023-12-02 16:49:11,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 16:49:11,714 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 27 states have internal predecessors, (46), 5 states have call successors, (5), 3 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 31 [2023-12-02 16:49:11,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:11,715 INFO L225 Difference]: With dead ends: 154 [2023-12-02 16:49:11,715 INFO L226 Difference]: Without dead ends: 154 [2023-12-02 16:49:11,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1190 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=271, Invalid=4015, Unknown=8, NotChecked=128, Total=4422 [2023-12-02 16:49:11,717 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 51 mSDsluCounter, 503 mSDsCounter, 0 mSdLazyCounter, 663 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:11,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 535 Invalid, 785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 663 Invalid, 0 Unknown, 100 Unchecked, 0.4s Time] [2023-12-02 16:49:11,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2023-12-02 16:49:11,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 123. [2023-12-02 16:49:11,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 103 states have (on average 1.3398058252427185) internal successors, (138), 114 states have internal predecessors, (138), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-12-02 16:49:11,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 150 transitions. [2023-12-02 16:49:11,721 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 150 transitions. Word has length 31 [2023-12-02 16:49:11,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:11,722 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 150 transitions. [2023-12-02 16:49:11,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 27 states have internal predecessors, (46), 5 states have call successors, (5), 3 states have call predecessors, (5), 6 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:11,722 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 150 transitions. [2023-12-02 16:49:11,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 16:49:11,722 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:11,723 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:11,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 16:49:11,923 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:11,923 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:11,923 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:11,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1571655847, now seen corresponding path program 1 times [2023-12-02 16:49:11,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:11,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898737122] [2023-12-02 16:49:11,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:11,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:11,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:12,369 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:49:12,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:12,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898737122] [2023-12-02 16:49:12,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898737122] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:12,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576941193] [2023-12-02 16:49:12,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:12,370 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:12,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:49:12,370 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:49:12,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 16:49:12,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:12,481 INFO L262 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 55 conjunts are in the unsatisfiable core [2023-12-02 16:49:12,483 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:49:12,553 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:49:12,588 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:49:12,667 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base (select |c_#valid| alloc_and_zero_internal_~pi~1.base))) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0) (= (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.base| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.base|))) is different from true [2023-12-02 16:49:12,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:49:12,677 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 18 treesize of output 13 [2023-12-02 16:49:12,711 INFO L349 Elim1Store]: treesize reduction 64, result has 29.7 percent of original size [2023-12-02 16:49:12,711 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 36 [2023-12-02 16:49:12,768 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 29 treesize of output 13 [2023-12-02 16:49:12,775 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 17 treesize of output 9 [2023-12-02 16:49:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:49:12,799 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:12,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576941193] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:12,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [789983082] [2023-12-02 16:49:12,929 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 16:49:12,929 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:12,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:12,929 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:12,929 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:18,345 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 83 for LOIs [2023-12-02 16:49:18,380 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 1 for LOIs [2023-12-02 16:49:18,388 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:49:26,551 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6777#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_set_~x#1.base|) 1)) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (or (not (= |ULTIMATE.start_set_~x#1.base| 0)) (not (= |ULTIMATE.start_set_~x#1.offset| 0))) (= |ULTIMATE.start_set_~shared#1.offset| 0))' at error location [2023-12-02 16:49:26,551 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:49:26,552 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:49:26,552 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 15] total 26 [2023-12-02 16:49:26,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616631557] [2023-12-02 16:49:26,552 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:49:26,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 16:49:26,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:26,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 16:49:26,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2198, Unknown=3, NotChecked=94, Total=2450 [2023-12-02 16:49:26,555 INFO L87 Difference]: Start difference. First operand 123 states and 150 transitions. Second operand has 27 states, 20 states have (on average 2.35) internal successors, (47), 22 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:27,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:27,195 INFO L93 Difference]: Finished difference Result 143 states and 177 transitions. [2023-12-02 16:49:27,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 16:49:27,195 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 20 states have (on average 2.35) internal successors, (47), 22 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 32 [2023-12-02 16:49:27,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:27,196 INFO L225 Difference]: With dead ends: 143 [2023-12-02 16:49:27,196 INFO L226 Difference]: Without dead ends: 143 [2023-12-02 16:49:27,197 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=197, Invalid=2666, Unknown=3, NotChecked=104, Total=2970 [2023-12-02 16:49:27,197 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 16 mSDsluCounter, 561 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 607 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 86 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:27,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 607 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 640 Invalid, 0 Unknown, 86 Unchecked, 0.4s Time] [2023-12-02 16:49:27,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-12-02 16:49:27,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 139. [2023-12-02 16:49:27,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 117 states have (on average 1.3333333333333333) internal successors, (156), 128 states have internal predecessors, (156), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:49:27,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 172 transitions. [2023-12-02 16:49:27,201 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 172 transitions. Word has length 32 [2023-12-02 16:49:27,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:27,201 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 172 transitions. [2023-12-02 16:49:27,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 20 states have (on average 2.35) internal successors, (47), 22 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:27,202 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 172 transitions. [2023-12-02 16:49:27,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 16:49:27,202 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:27,202 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:27,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 16:49:27,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-12-02 16:49:27,403 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:27,403 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:27,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1571655846, now seen corresponding path program 1 times [2023-12-02 16:49:27,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:27,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1351946657] [2023-12-02 16:49:27,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:27,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:27,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:49:28,099 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:28,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1351946657] [2023-12-02 16:49:28,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1351946657] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:28,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537344320] [2023-12-02 16:49:28,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:28,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:28,099 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:49:28,100 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:49:28,102 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 16:49:28,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:28,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 74 conjunts are in the unsatisfiable core [2023-12-02 16:49:28,222 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:49:28,319 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-12-02 16:49:28,321 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:49:28,411 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 [2023-12-02 16:49:28,423 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-12-02 16:49:28,561 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base (select |c_#length| alloc_and_zero_internal_~pi~1.base)) |c_#length|) (= (store |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.offset| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.offset|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0) (= (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.base| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.base|))) is different from true [2023-12-02 16:49:28,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:49:28,583 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 20 [2023-12-02 16:49:28,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:49:28,589 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 18 treesize of output 13 [2023-12-02 16:49:28,614 INFO L349 Elim1Store]: treesize reduction 20, result has 39.4 percent of original size [2023-12-02 16:49:28,614 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 20 treesize of output 22 [2023-12-02 16:49:28,618 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 [2023-12-02 16:49:28,743 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 11 [2023-12-02 16:49:28,749 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 29 treesize of output 13 [2023-12-02 16:49:28,758 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 17 treesize of output 9 [2023-12-02 16:49:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:49:28,768 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:29,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537344320] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:29,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33892621] [2023-12-02 16:49:29,098 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 16:49:29,098 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:29,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:29,099 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:29,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:34,610 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 83 for LOIs [2023-12-02 16:49:34,645 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 1 for LOIs [2023-12-02 16:49:34,653 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:49:41,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7245#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (or (< (+ |ULTIMATE.start_set_~x#1.offset| 8) 0) (< (select |#length| |ULTIMATE.start_set_~x#1.base|) (+ |ULTIMATE.start_set_~x#1.offset| 16))) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (or (not (= |ULTIMATE.start_set_~x#1.base| 0)) (not (= |ULTIMATE.start_set_~x#1.offset| 0))) (= |ULTIMATE.start_set_~shared#1.offset| 0))' at error location [2023-12-02 16:49:41,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:49:41,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:49:41,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 28 [2023-12-02 16:49:41,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958291453] [2023-12-02 16:49:41,444 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:49:41,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 16:49:41,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:41,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 16:49:41,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=2478, Unknown=3, NotChecked=100, Total=2756 [2023-12-02 16:49:41,446 INFO L87 Difference]: Start difference. First operand 139 states and 172 transitions. Second operand has 29 states, 21 states have (on average 2.238095238095238) internal successors, (47), 24 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:44,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:44,411 INFO L93 Difference]: Finished difference Result 142 states and 176 transitions. [2023-12-02 16:49:44,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 16:49:44,411 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 2.238095238095238) internal successors, (47), 24 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 32 [2023-12-02 16:49:44,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:44,412 INFO L225 Difference]: With dead ends: 142 [2023-12-02 16:49:44,412 INFO L226 Difference]: Without dead ends: 142 [2023-12-02 16:49:44,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 889 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=206, Invalid=2874, Unknown=4, NotChecked=108, Total=3192 [2023-12-02 16:49:44,413 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 10 mSDsluCounter, 676 mSDsCounter, 0 mSdLazyCounter, 791 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 724 SdHoareTripleChecker+Invalid, 890 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 85 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:44,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 724 Invalid, 890 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 791 Invalid, 0 Unknown, 85 Unchecked, 0.6s Time] [2023-12-02 16:49:44,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-12-02 16:49:44,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2023-12-02 16:49:44,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 118 states have (on average 1.3220338983050848) internal successors, (156), 129 states have internal predecessors, (156), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:49:44,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 172 transitions. [2023-12-02 16:49:44,417 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 172 transitions. Word has length 32 [2023-12-02 16:49:44,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:44,417 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 172 transitions. [2023-12-02 16:49:44,417 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 2.238095238095238) internal successors, (47), 24 states have internal predecessors, (47), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2023-12-02 16:49:44,417 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 172 transitions. [2023-12-02 16:49:44,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 16:49:44,418 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:44,418 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:44,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 16:49:44,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-12-02 16:49:44,618 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr20ASSERT_VIOLATIONMEMORY_FREE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:44,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:44,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1042696985, now seen corresponding path program 1 times [2023-12-02 16:49:44,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:44,619 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435495955] [2023-12-02 16:49:44,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:44,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:44,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:44,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 16:49:44,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:44,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435495955] [2023-12-02 16:49:44,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435495955] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:49:44,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:49:44,705 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 16:49:44,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332905128] [2023-12-02 16:49:44,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:49:44,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:49:44,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:44,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:49:44,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:49:44,707 INFO L87 Difference]: Start difference. First operand 140 states and 172 transitions. Second operand has 8 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:44,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:49:44,846 INFO L93 Difference]: Finished difference Result 146 states and 178 transitions. [2023-12-02 16:49:44,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:49:44,846 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2023-12-02 16:49:44,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:49:44,848 INFO L225 Difference]: With dead ends: 146 [2023-12-02 16:49:44,848 INFO L226 Difference]: Without dead ends: 146 [2023-12-02 16:49:44,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-12-02 16:49:44,848 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 31 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:49:44,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 191 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:49:44,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-12-02 16:49:44,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 143. [2023-12-02 16:49:44,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 121 states have (on average 1.3388429752066116) internal successors, (162), 132 states have internal predecessors, (162), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:49:44,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 178 transitions. [2023-12-02 16:49:44,852 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 178 transitions. Word has length 32 [2023-12-02 16:49:44,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:49:44,853 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 178 transitions. [2023-12-02 16:49:44,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 16:49:44,853 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 178 transitions. [2023-12-02 16:49:44,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 16:49:44,853 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:49:44,854 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:49:44,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2023-12-02 16:49:44,854 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:49:44,854 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:49:44,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1760716981, now seen corresponding path program 2 times [2023-12-02 16:49:44,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:49:44,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041378399] [2023-12-02 16:49:44,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:49:44,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:49:44,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:49:45,990 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:49:45,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:49:45,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041378399] [2023-12-02 16:49:45,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041378399] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:45,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [939678225] [2023-12-02 16:49:45,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:49:45,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:49:45,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:49:45,992 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:49:45,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 16:49:46,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:49:46,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:49:46,164 INFO L262 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 99 conjunts are in the unsatisfiable core [2023-12-02 16:49:46,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:49:46,173 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:49:46,261 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 [2023-12-02 16:49:46,267 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 16:49:46,320 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 23 treesize of output 11 [2023-12-02 16:49:46,329 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 23 treesize of output 11 [2023-12-02 16:49:46,403 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-12-02 16:49:46,403 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 16:49:46,505 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-12-02 16:49:46,517 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 23 treesize of output 22 [2023-12-02 16:49:46,750 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= (store |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.offset| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.offset|) (= (select |c_old(#valid)| alloc_and_zero_internal_~pi~1.base) 0) (= (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (select |c_#memory_$Pointer$.base| alloc_and_zero_internal_~pi~1.base)) |c_#memory_$Pointer$.base|))) is different from true [2023-12-02 16:49:46,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:49:46,778 INFO L349 Elim1Store]: treesize reduction 25, result has 16.7 percent of original size [2023-12-02 16:49:46,779 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 43 [2023-12-02 16:49:46,803 INFO L349 Elim1Store]: treesize reduction 8, result has 61.9 percent of original size [2023-12-02 16:49:46,803 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 22 [2023-12-02 16:49:46,809 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2023-12-02 16:49:46,980 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2023-12-02 16:49:46,986 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 16:49:46,987 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 32 [2023-12-02 16:49:47,182 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 39 [2023-12-02 16:49:47,191 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-12-02 16:49:47,191 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 53 treesize of output 35 [2023-12-02 16:49:47,301 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:49:47,301 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:47,803 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [939678225] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:49:47,804 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1077324297] [2023-12-02 16:49:47,805 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2023-12-02 16:49:47,805 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:47,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:47,806 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:47,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:53,231 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 83 for LOIs [2023-12-02 16:49:53,266 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 1 for LOIs [2023-12-02 16:49:53,274 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:00,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8037#(and (= |ULTIMATE.start_set_#in~shared#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_set_~x#1.base|) 1)) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (or (not (= |ULTIMATE.start_set_~x#1.base| 0)) (not (= |ULTIMATE.start_set_~x#1.offset| 0))) (= |ULTIMATE.start_set_~shared#1.offset| 0))' at error location [2023-12-02 16:50:00,594 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:00,594 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:50:00,594 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 35 [2023-12-02 16:50:00,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060405522] [2023-12-02 16:50:00,594 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:00,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 16:50:00,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:00,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 16:50:00,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=3227, Unknown=3, NotChecked=114, Total=3540 [2023-12-02 16:50:00,595 INFO L87 Difference]: Start difference. First operand 143 states and 178 transitions. Second operand has 35 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 30 states have internal predecessors, (50), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-12-02 16:50:02,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:02,217 INFO L93 Difference]: Finished difference Result 184 states and 224 transitions. [2023-12-02 16:50:02,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 16:50:02,218 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 30 states have internal predecessors, (50), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2023-12-02 16:50:02,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:02,219 INFO L225 Difference]: With dead ends: 184 [2023-12-02 16:50:02,219 INFO L226 Difference]: Without dead ends: 184 [2023-12-02 16:50:02,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1324 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=272, Invalid=4285, Unknown=3, NotChecked=132, Total=4692 [2023-12-02 16:50:02,220 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 63 mSDsluCounter, 843 mSDsCounter, 0 mSdLazyCounter, 976 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 902 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 976 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:02,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 902 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 976 Invalid, 0 Unknown, 107 Unchecked, 0.9s Time] [2023-12-02 16:50:02,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-12-02 16:50:02,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 144. [2023-12-02 16:50:02,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 122 states have (on average 1.3360655737704918) internal successors, (163), 133 states have internal predecessors, (163), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:50:02,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 179 transitions. [2023-12-02 16:50:02,225 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 179 transitions. Word has length 35 [2023-12-02 16:50:02,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:02,225 INFO L495 AbstractCegarLoop]: Abstraction has 144 states and 179 transitions. [2023-12-02 16:50:02,225 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 28 states have (on average 1.7857142857142858) internal successors, (50), 30 states have internal predecessors, (50), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2023-12-02 16:50:02,226 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 179 transitions. [2023-12-02 16:50:02,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 16:50:02,226 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:02,226 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:02,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-12-02 16:50:02,426 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:02,427 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:50:02,427 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:02,427 INFO L85 PathProgramCache]: Analyzing trace with hash 1782551047, now seen corresponding path program 1 times [2023-12-02 16:50:02,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:02,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999503447] [2023-12-02 16:50:02,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:02,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:02,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:02,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:50:02,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:02,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999503447] [2023-12-02 16:50:02,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999503447] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:02,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011461052] [2023-12-02 16:50:02,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:02,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:02,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:02,856 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:02,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 16:50:03,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:03,016 INFO L262 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 54 conjunts are in the unsatisfiable core [2023-12-02 16:50:03,018 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:03,021 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:50:03,075 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 [2023-12-02 16:50:03,081 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 [2023-12-02 16:50:03,135 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:50:03,136 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-12-02 16:50:03,270 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:50:03,273 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:50:03,395 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:03,395 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 15 treesize of output 15 [2023-12-02 16:50:03,410 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:03,411 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 15 treesize of output 15 [2023-12-02 16:50:03,478 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:50:03,478 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:03,584 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1348 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_set_~x#1.base| v_ArrVal_1348) |c_ULTIMATE.start_main_~shared~0#1.base|) 0) 0)) (forall ((v_ArrVal_1347 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_set_~x#1.base| v_ArrVal_1347) |c_ULTIMATE.start_main_~shared~0#1.base|) 0) 0))) is different from false [2023-12-02 16:50:03,716 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1348 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~l~0#1.base| v_ArrVal_1348) |c_ULTIMATE.start_create_internal_#t~ret5#1.base|) 0) 0)) (forall ((v_ArrVal_1347 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~l~0#1.base| v_ArrVal_1347) |c_ULTIMATE.start_create_internal_#t~ret5#1.base|) 0) 0))) is different from false [2023-12-02 16:50:03,790 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:03,791 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 37 treesize of output 38 [2023-12-02 16:50:03,795 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 50 treesize of output 42 [2023-12-02 16:50:03,802 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:03,803 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 29 treesize of output 30 [2023-12-02 16:50:03,807 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 [2023-12-02 16:50:03,811 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 21 treesize of output 19 [2023-12-02 16:50:03,815 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 19 treesize of output 17 [2023-12-02 16:50:04,104 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:04,104 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 18 treesize of output 19 [2023-12-02 16:50:04,113 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:04,113 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 30 [2023-12-02 16:50:04,118 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2023-12-02 16:50:04,135 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:04,136 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 18 treesize of output 19 [2023-12-02 16:50:04,138 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:50:04,144 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-12-02 16:50:04,145 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 16 treesize of output 11 [2023-12-02 16:50:04,447 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-12-02 16:50:04,447 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011461052] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:04,447 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [628453136] [2023-12-02 16:50:04,449 INFO L159 IcfgInterpreter]: Started Sifa with 32 locations of interest [2023-12-02 16:50:04,449 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:04,449 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:04,449 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:04,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:04,899 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 52 for LOIs [2023-12-02 16:50:04,910 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:50:04,919 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:09,475 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8644#(and (not (= (select |#valid| |ULTIMATE.start_destroy_internal_~l#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= |ULTIMATE.start_destroy_internal_#in~l#1.offset| 0))' at error location [2023-12-02 16:50:09,475 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:09,475 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:09,475 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 37 [2023-12-02 16:50:09,475 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822331055] [2023-12-02 16:50:09,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:09,476 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 16:50:09,476 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:09,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 16:50:09,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=3699, Unknown=20, NotChecked=246, Total=4160 [2023-12-02 16:50:09,477 INFO L87 Difference]: Start difference. First operand 144 states and 179 transitions. Second operand has 37 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:50:11,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:11,180 INFO L93 Difference]: Finished difference Result 156 states and 191 transitions. [2023-12-02 16:50:11,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-12-02 16:50:11,180 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2023-12-02 16:50:11,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:11,181 INFO L225 Difference]: With dead ends: 156 [2023-12-02 16:50:11,181 INFO L226 Difference]: Without dead ends: 156 [2023-12-02 16:50:11,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=285, Invalid=5253, Unknown=20, NotChecked=294, Total=5852 [2023-12-02 16:50:11,183 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 72 mSDsluCounter, 665 mSDsCounter, 0 mSdLazyCounter, 1002 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 1165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:11,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 691 Invalid, 1165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1002 Invalid, 0 Unknown, 140 Unchecked, 0.9s Time] [2023-12-02 16:50:11,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-12-02 16:50:11,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 150. [2023-12-02 16:50:11,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 128 states have (on average 1.3203125) internal successors, (169), 139 states have internal predecessors, (169), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:50:11,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 185 transitions. [2023-12-02 16:50:11,188 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 185 transitions. Word has length 35 [2023-12-02 16:50:11,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:11,188 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 185 transitions. [2023-12-02 16:50:11,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 30 states have (on average 2.3) internal successors, (69), 30 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 5 states have call predecessors, (5), 3 states have call successors, (5) [2023-12-02 16:50:11,189 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 185 transitions. [2023-12-02 16:50:11,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-12-02 16:50:11,189 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:11,189 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:11,194 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 16:50:11,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:11,390 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr22ASSERT_VIOLATIONMEMORY_LEAK === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:50:11,390 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:11,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1782552580, now seen corresponding path program 1 times [2023-12-02 16:50:11,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:11,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53119527] [2023-12-02 16:50:11,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:11,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:11,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:11,941 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 16:50:11,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:11,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53119527] [2023-12-02 16:50:11,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53119527] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:11,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402000460] [2023-12-02 16:50:11,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:11,942 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:11,942 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:11,943 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:11,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 16:50:12,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:12,099 INFO L262 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 52 conjunts are in the unsatisfiable core [2023-12-02 16:50:12,100 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:12,487 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 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 16 treesize of output 31 [2023-12-02 16:50:12,497 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_destroy_~l#1.base_41| Int)) (and (= (select |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_destroy_~l#1.base_41|) 0) (= (store (store |c_#valid| |v_ULTIMATE.start_destroy_~l#1.base_41| 1) |c_ULTIMATE.start_main_~shared~0#1.base| 0) (store |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_destroy_~l#1.base_41| 1)) (= (select |c_#valid| |v_ULTIMATE.start_destroy_~l#1.base_41|) 0))) is different from true [2023-12-02 16:50:12,508 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_destroy_~l#1.base_41| Int)) (and (= (select |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_destroy_~l#1.base_41|) 0) (= (select |c_#valid| |v_ULTIMATE.start_destroy_~l#1.base_41|) 0) (= (store |c_ULTIMATE.start_main_old_#valid#1| |v_ULTIMATE.start_destroy_~l#1.base_41| 1) (store (store |c_#valid| |v_ULTIMATE.start_destroy_~l#1.base_41| 1) |c_ULTIMATE.start_destroy_internal_~l#1.base| 0)))) is different from true [2023-12-02 16:50:12,556 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-12-02 16:50:12,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 39 [2023-12-02 16:50:12,642 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-12-02 16:50:12,642 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:12,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402000460] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:12,853 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [746883958] [2023-12-02 16:50:12,854 INFO L159 IcfgInterpreter]: Started Sifa with 33 locations of interest [2023-12-02 16:50:12,854 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:12,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:12,855 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:12,855 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:13,334 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 50 for LOIs [2023-12-02 16:50:13,345 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:50:13,354 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:17,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9206#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~l~0#1.offset| 0) (= |ULTIMATE.start_create_internal_#res#1.offset| 0) (not (= |ULTIMATE.start_main_old_#valid#1| |#valid|)) (= |ULTIMATE.start_create_#res#1.offset| 0) (= 0 |ULTIMATE.start_main_~shared~0#1.offset|) (= |ULTIMATE.start_main_#res#1| 0))' at error location [2023-12-02 16:50:17,997 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:17,997 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:50:17,997 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 27 [2023-12-02 16:50:17,997 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657900348] [2023-12-02 16:50:17,998 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:17,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 16:50:17,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:17,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 16:50:17,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3490, Unknown=2, NotChecked=238, Total=3906 [2023-12-02 16:50:17,999 INFO L87 Difference]: Start difference. First operand 150 states and 185 transitions. Second operand has 29 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:50:18,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:18,836 INFO L93 Difference]: Finished difference Result 163 states and 197 transitions. [2023-12-02 16:50:18,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-12-02 16:50:18,836 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 35 [2023-12-02 16:50:18,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:18,837 INFO L225 Difference]: With dead ends: 163 [2023-12-02 16:50:18,837 INFO L226 Difference]: Without dead ends: 145 [2023-12-02 16:50:18,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=217, Invalid=4211, Unknown=2, NotChecked=262, Total=4692 [2023-12-02 16:50:18,838 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 28 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 168 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:18,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 317 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 683 Invalid, 0 Unknown, 168 Unchecked, 0.5s Time] [2023-12-02 16:50:18,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2023-12-02 16:50:18,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 145. [2023-12-02 16:50:18,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 123 states have (on average 1.3252032520325203) internal successors, (163), 134 states have internal predecessors, (163), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-12-02 16:50:18,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 179 transitions. [2023-12-02 16:50:18,842 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 179 transitions. Word has length 35 [2023-12-02 16:50:18,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:18,842 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 179 transitions. [2023-12-02 16:50:18,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 23 states have (on average 2.5652173913043477) internal successors, (59), 23 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 16:50:18,842 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 179 transitions. [2023-12-02 16:50:18,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-12-02 16:50:18,843 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:18,843 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:18,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-12-02 16:50:19,043 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2023-12-02 16:50:19,043 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:50:19,044 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:19,044 INFO L85 PathProgramCache]: Analyzing trace with hash -340938489, now seen corresponding path program 1 times [2023-12-02 16:50:19,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:19,044 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040379506] [2023-12-02 16:50:19,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:19,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:19,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:19,237 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 16:50:19,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:19,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040379506] [2023-12-02 16:50:19,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040379506] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:19,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173704886] [2023-12-02 16:50:19,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:19,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:19,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:19,239 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:19,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 16:50:19,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:19,376 INFO L262 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 16:50:19,377 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:19,530 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:50:19,530 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:50:19,601 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:50:19,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 23 [2023-12-02 16:50:19,666 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 16:50:19,666 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173704886] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:50:19,666 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429724235] [2023-12-02 16:50:19,667 INFO L159 IcfgInterpreter]: Started Sifa with 32 locations of interest [2023-12-02 16:50:19,668 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:50:19,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:50:19,668 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:50:19,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:50:20,839 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 150 for LOIs [2023-12-02 16:50:20,962 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-12-02 16:50:20,973 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:50:31,050 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9792#(and (= |ULTIMATE.start_destroy_internal_#in~l#1.base| |ULTIMATE.start_main_~shared~0#1.base|) (= |ULTIMATE.start_destroy_internal_#in~l#1.offset| |ULTIMATE.start_main_~shared~0#1.offset|) (= |ULTIMATE.start_destroy_internal_#in~l#1.offset| |ULTIMATE.start_destroy_internal_~l#1.offset|) (or (< |ULTIMATE.start_destroy_internal_~l#1.offset| 0) (< (select |#length| |ULTIMATE.start_destroy_internal_~l#1.base|) (+ |ULTIMATE.start_destroy_internal_~l#1.offset| 8))) (<= 0 (+ |ULTIMATE.start_main_~l~0#1.offset| 8)) (or (not (= |ULTIMATE.start_destroy_internal_~l#1.offset| 0)) (not (= |ULTIMATE.start_destroy_internal_~l#1.base| 0))) (= |ULTIMATE.start_destroy_internal_~l#1.base| |ULTIMATE.start_destroy_internal_#in~l#1.base|))' at error location [2023-12-02 16:50:31,050 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:50:31,050 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:50:31,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5, 5] total 14 [2023-12-02 16:50:31,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316469101] [2023-12-02 16:50:31,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:50:31,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 16:50:31,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:50:31,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 16:50:31,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1613, Unknown=2, NotChecked=0, Total=1722 [2023-12-02 16:50:31,052 INFO L87 Difference]: Start difference. First operand 145 states and 179 transitions. Second operand has 15 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 14 states have internal predecessors, (56), 4 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 16:50:31,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:50:31,357 INFO L93 Difference]: Finished difference Result 201 states and 242 transitions. [2023-12-02 16:50:31,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 16:50:31,357 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 14 states have internal predecessors, (56), 4 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 38 [2023-12-02 16:50:31,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:50:31,359 INFO L225 Difference]: With dead ends: 201 [2023-12-02 16:50:31,359 INFO L226 Difference]: Without dead ends: 201 [2023-12-02 16:50:31,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=124, Invalid=1854, Unknown=2, NotChecked=0, Total=1980 [2023-12-02 16:50:31,360 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 58 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:50:31,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 324 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:50:31,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-12-02 16:50:31,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 161. [2023-12-02 16:50:31,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 138 states have (on average 1.3043478260869565) internal successors, (180), 149 states have internal predecessors, (180), 9 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-12-02 16:50:31,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 198 transitions. [2023-12-02 16:50:31,366 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 198 transitions. Word has length 38 [2023-12-02 16:50:31,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:50:31,366 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 198 transitions. [2023-12-02 16:50:31,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 4.3076923076923075) internal successors, (56), 14 states have internal predecessors, (56), 4 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 16:50:31,366 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 198 transitions. [2023-12-02 16:50:31,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-12-02 16:50:31,367 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:50:31,367 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:50:31,372 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2023-12-02 16:50:31,567 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2023-12-02 16:50:31,568 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [alloc_and_zeroErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, alloc_and_zeroErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 26 more)] === [2023-12-02 16:50:31,568 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:50:31,568 INFO L85 PathProgramCache]: Analyzing trace with hash 1327675699, now seen corresponding path program 2 times [2023-12-02 16:50:31,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:50:31,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201445570] [2023-12-02 16:50:31,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:50:31,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:50:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:50:33,190 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:50:33,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:50:33,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201445570] [2023-12-02 16:50:33,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201445570] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:50:33,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019194518] [2023-12-02 16:50:33,191 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:50:33,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:50:33,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:50:33,192 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:50:33,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_feb97374-c89b-4a3d-8b87-21ed454c7807/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-12-02 16:50:33,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 16:50:33,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:50:33,345 INFO L262 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 104 conjunts are in the unsatisfiable core [2023-12-02 16:50:33,349 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:50:33,353 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:50:33,401 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 [2023-12-02 16:50:33,406 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 [2023-12-02 16:50:33,475 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 23 treesize of output 11 [2023-12-02 16:50:33,481 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 23 treesize of output 11 [2023-12-02 16:50:33,906 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 16:50:33,906 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 15 [2023-12-02 16:50:33,937 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-12-02 16:50:33,938 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-12-02 16:50:33,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-12-02 16:50:34,277 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 16:50:34,278 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 1 case distinctions, treesize of input 16 treesize of output 15 [2023-12-02 16:50:34,308 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-12-02 16:50:34,309 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-12-02 16:50:34,318 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 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 16 treesize of output 11 [2023-12-02 16:50:34,415 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 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 23 treesize of output 11 [2023-12-02 16:50:34,425 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 [2023-12-02 16:50:34,716 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (and (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base (store (select |c_old(#memory_$Pointer$.base)| alloc_and_zero_internal_~pi~1.base) 0 0))) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base (store (select |c_old(#memory_$Pointer$.offset)| alloc_and_zero_internal_~pi~1.base) 0 0))))) is different from true [2023-12-02 16:50:34,764 INFO L349 Elim1Store]: treesize reduction 32, result has 41.8 percent of original size [2023-12-02 16:50:34,764 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 42 treesize of output 44 [2023-12-02 16:50:34,784 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-12-02 16:50:34,785 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 1 case distinctions, treesize of input 19 treesize of output 18 [2023-12-02 16:50:35,065 INFO L349 Elim1Store]: treesize reduction 40, result has 40.3 percent of original size [2023-12-02 16:50:35,066 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 70 treesize of output 87 [2023-12-02 16:50:35,156 INFO L349 Elim1Store]: treesize reduction 68, result has 39.3 percent of original size [2023-12-02 16:50:35,156 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 66 treesize of output 98 [2023-12-02 16:51:26,821 WARN L293 SmtUtils]: Spent 27.13s on a formula simplification. DAG size of input: 4463 DAG size of output: 409 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-12-02 16:51:26,821 INFO L349 Elim1Store]: treesize reduction 8685, result has 8.1 percent of original size [2023-12-02 16:51:26,822 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 46 select indices, 46 select index equivalence classes, 0 disjoint index pairs (out of 1035 index pairs), introduced 49 new quantified variables, introduced 1080 case distinctions, treesize of input 961 treesize of output 1538 [2023-12-02 16:51:27,169 INFO L224 Elim1Store]: Index analysis took 237 ms [2023-12-02 16:51:30,983 INFO L349 Elim1Store]: treesize reduction 2616, result has 13.5 percent of original size [2023-12-02 16:51:30,984 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 25 select indices, 25 select index equivalence classes, 0 disjoint index pairs (out of 300 index pairs), introduced 25 new quantified variables, introduced 324 case distinctions, treesize of input 763 treesize of output 1108 [2023-12-02 16:53:41,004 WARN L293 SmtUtils]: Spent 7.08s on a formula simplification. DAG size of input: 638 DAG size of output: 653 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-12-02 16:57:30,085 WARN L293 SmtUtils]: Spent 9.28s on a formula simplification. DAG size of input: 793 DAG size of output: 793 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)