./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 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/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_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire --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 0.2.3-dev-30e01a7 [2023-11-23 20:36:36,733 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:36:36,851 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-64bit-Taipan_Default.epf [2023-11-23 20:36:36,861 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:36:36,862 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:36:36,909 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:36:36,910 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:36:36,910 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:36:36,911 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:36:36,919 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:36:36,919 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:36:36,920 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:36:36,920 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:36:36,922 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:36:36,923 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:36:36,923 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:36:36,924 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:36:36,924 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:36:36,924 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:36:36,925 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:36:36,925 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:36:36,926 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:36:36,927 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 20:36:36,927 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 20:36:36,928 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:36:36,929 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:36:36,929 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:36:36,930 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 20:36:36,930 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 20:36:36,931 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 20:36:36,933 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:36:36,933 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 20:36:36,933 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 20:36:36,934 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:36:36,934 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:36:36,934 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:36:36,934 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:36:36,935 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:36:36,937 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:36:36,937 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:36:36,938 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:36:36,938 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:36:36,938 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:36:36,939 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:36:36,939 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:36:36,939 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_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f1741d130075f1f7f25c8fd49724f342261e16295a533d1b7fc59c9fdd3354e1 [2023-11-23 20:36:37,205 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:36:37,229 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:36:37,232 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:36:37,233 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:36:37,234 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:36:37,235 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i [2023-11-23 20:36:40,460 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:36:40,808 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:36:40,809 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/sv-benchmarks/c/memsafety-broom/sll-shared-sll-after.i [2023-11-23 20:36:40,849 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/data/95aa58ef3/22297610929b4523a8e68602bc370e8c/FLAG3aec6f0c0 [2023-11-23 20:36:40,864 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/data/95aa58ef3/22297610929b4523a8e68602bc370e8c [2023-11-23 20:36:40,867 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:36:40,868 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:36:40,870 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:36:40,870 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:36:40,877 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:36:40,877 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:40" (1/1) ... [2023-11-23 20:36:40,879 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2367ac76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:40, skipping insertion in model container [2023-11-23 20:36:40,879 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:36:40" (1/1) ... [2023-11-23 20:36:40,961 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:36:41,121 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 20:36:41,320 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:36:41,336 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:36:41,364 WARN L635 FunctionHandler]: implicit declaration of function __builtin_bswap16 [2023-11-23 20:36:41,396 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:36:41,419 WARN L675 CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 20:36:41,427 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:36:41,428 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41 WrapperNode [2023-11-23 20:36:41,428 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:36:41,429 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:36:41,430 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:36:41,430 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:36:41,438 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,452 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,476 INFO L138 Inliner]: procedures = 122, calls = 27, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 93 [2023-11-23 20:36:41,477 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:36:41,478 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:36:41,478 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:36:41,478 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:36:41,487 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,488 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,491 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,492 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,501 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,505 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,507 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,509 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,513 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:36:41,514 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:36:41,514 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:36:41,514 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:36:41,515 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (1/1) ... [2023-11-23 20:36:41,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:36:41,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:41,558 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:36:41,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:36:41,610 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero_internal [2023-11-23 20:36:41,611 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero_internal [2023-11-23 20:36:41,611 INFO L130 BoogieDeclarations]: Found specification of procedure alloc_and_zero [2023-11-23 20:36:41,611 INFO L138 BoogieDeclarations]: Found implementation of procedure alloc_and_zero [2023-11-23 20:36:41,611 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 20:36:41,613 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 20:36:41,614 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 20:36:41,614 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:36:41,615 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:36:41,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:36:41,755 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:36:41,757 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:36:42,146 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:36:42,243 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:36:42,243 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-23 20:36:42,244 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:42 BoogieIcfgContainer [2023-11-23 20:36:42,244 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:36:42,247 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:36:42,247 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:36:42,251 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:36:42,251 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:36:40" (1/3) ... [2023-11-23 20:36:42,252 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ddad45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:42, skipping insertion in model container [2023-11-23 20:36:42,252 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:36:41" (2/3) ... [2023-11-23 20:36:42,252 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23ddad45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:36:42, skipping insertion in model container [2023-11-23 20:36:42,252 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:36:42" (3/3) ... [2023-11-23 20:36:42,254 INFO L112 eAbstractionObserver]: Analyzing ICFG sll-shared-sll-after.i [2023-11-23 20:36:42,274 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:36:42,275 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 29 error locations. [2023-11-23 20:36:42,336 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:36:42,343 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;@4c4a9ce8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:36:42,344 INFO L358 AbstractCegarLoop]: Starting to check reachability of 29 error locations. [2023-11-23 20:36:42,348 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) [2023-11-23 20:36:42,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 20:36:42,356 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:42,356 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 20:36:42,357 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)] === [2023-11-23 20:36:42,363 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:42,363 INFO L85 PathProgramCache]: Analyzing trace with hash 5796754, now seen corresponding path program 1 times [2023-11-23 20:36:42,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:42,375 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558144758] [2023-11-23 20:36:42,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:42,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:42,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:42,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:42,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:42,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558144758] [2023-11-23 20:36:42,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558144758] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:42,686 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:42,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:36:42,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179337580] [2023-11-23 20:36:42,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:42,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:42,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:42,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:42,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:42,746 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) [2023-11-23 20:36:42,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:42,906 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2023-11-23 20:36:42,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:42,909 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 [2023-11-23 20:36:42,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:42,920 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:36:42,920 INFO L226 Difference]: Without dead ends: 65 [2023-11-23 20:36:42,926 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:42,932 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 [2023-11-23 20:36:42,934 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] [2023-11-23 20:36:42,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-23 20:36:42,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-23 20:36:42,979 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) [2023-11-23 20:36:42,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2023-11-23 20:36:42,986 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 4 [2023-11-23 20:36:42,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:42,987 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2023-11-23 20:36:42,987 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) [2023-11-23 20:36:42,987 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2023-11-23 20:36:42,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 20:36:42,988 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:42,988 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 20:36:42,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:36:42,990 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)] === [2023-11-23 20:36:42,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:42,992 INFO L85 PathProgramCache]: Analyzing trace with hash 5796755, now seen corresponding path program 1 times [2023-11-23 20:36:42,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:42,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [852945497] [2023-11-23 20:36:42,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:42,994 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:43,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:43,128 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:43,131 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:43,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [852945497] [2023-11-23 20:36:43,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [852945497] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:43,133 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:43,133 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:36:43,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931427789] [2023-11-23 20:36:43,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:43,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:43,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:43,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:43,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,138 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) [2023-11-23 20:36:43,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:43,221 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2023-11-23 20:36:43,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:43,222 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 [2023-11-23 20:36:43,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:43,224 INFO L225 Difference]: With dead ends: 63 [2023-11-23 20:36:43,224 INFO L226 Difference]: Without dead ends: 63 [2023-11-23 20:36:43,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,226 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 2 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-11-23 20:36:43,227 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] [2023-11-23 20:36:43,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-23 20:36:43,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-11-23 20:36:43,234 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) [2023-11-23 20:36:43,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 69 transitions. [2023-11-23 20:36:43,236 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 69 transitions. Word has length 4 [2023-11-23 20:36:43,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:43,237 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 69 transitions. [2023-11-23 20:36:43,237 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) [2023-11-23 20:36:43,237 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 69 transitions. [2023-11-23 20:36:43,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 20:36:43,238 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:43,238 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:43,239 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:36:43,239 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)] === [2023-11-23 20:36:43,239 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:43,240 INFO L85 PathProgramCache]: Analyzing trace with hash -1995356130, now seen corresponding path program 1 times [2023-11-23 20:36:43,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:43,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764398064] [2023-11-23 20:36:43,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:43,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:43,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:43,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:43,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:43,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764398064] [2023-11-23 20:36:43,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [764398064] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:43,382 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:43,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:36:43,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836796340] [2023-11-23 20:36:43,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:43,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:43,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:43,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:43,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,388 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) [2023-11-23 20:36:43,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:43,466 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2023-11-23 20:36:43,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:43,467 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 [2023-11-23 20:36:43,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:43,469 INFO L225 Difference]: With dead ends: 62 [2023-11-23 20:36:43,469 INFO L226 Difference]: Without dead ends: 62 [2023-11-23 20:36:43,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,471 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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 [2023-11-23 20:36:43,472 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] [2023-11-23 20:36:43,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-11-23 20:36:43,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2023-11-23 20:36:43,479 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) [2023-11-23 20:36:43,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-11-23 20:36:43,481 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 13 [2023-11-23 20:36:43,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:43,482 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-11-23 20:36:43,483 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) [2023-11-23 20:36:43,483 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-11-23 20:36:43,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 20:36:43,483 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:43,484 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:43,484 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:36:43,484 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)] === [2023-11-23 20:36:43,485 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:43,485 INFO L85 PathProgramCache]: Analyzing trace with hash -1995356129, now seen corresponding path program 1 times [2023-11-23 20:36:43,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:43,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562548] [2023-11-23 20:36:43,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:43,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:43,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:43,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:43,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:43,678 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562548] [2023-11-23 20:36:43,678 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562548] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:43,679 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:43,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:36:43,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776334729] [2023-11-23 20:36:43,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:43,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:36:43,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:43,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:36:43,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,682 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) [2023-11-23 20:36:43,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:43,767 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2023-11-23 20:36:43,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:36:43,772 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 [2023-11-23 20:36:43,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:43,777 INFO L225 Difference]: With dead ends: 61 [2023-11-23 20:36:43,778 INFO L226 Difference]: Without dead ends: 61 [2023-11-23 20:36:43,778 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:36:43,788 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, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:43,791 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 90 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:36:43,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-23 20:36:43,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-11-23 20:36:43,804 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) [2023-11-23 20:36:43,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2023-11-23 20:36:43,808 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 13 [2023-11-23 20:36:43,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:43,809 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2023-11-23 20:36:43,809 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) [2023-11-23 20:36:43,809 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2023-11-23 20:36:43,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 20:36:43,810 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:43,811 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:43,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:36:43,811 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)] === [2023-11-23 20:36:43,813 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:43,813 INFO L85 PathProgramCache]: Analyzing trace with hash -717837352, now seen corresponding path program 1 times [2023-11-23 20:36:43,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:43,814 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952927830] [2023-11-23 20:36:43,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:43,815 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:43,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:44,123 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:44,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:44,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952927830] [2023-11-23 20:36:44,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952927830] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:44,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656104762] [2023-11-23 20:36:44,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:44,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:44,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:44,127 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:44,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:36:44,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:44,243 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:36:44,261 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:44,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:36:44,384 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 [2023-11-23 20:36:44,455 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-23 20:36:44,455 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 [2023-11-23 20:36:44,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2023-11-23 20:36:44,464 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:36:44,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656104762] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:44,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1671653166] [2023-11-23 20:36:44,578 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:36:44,578 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:36:44,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:36:44,590 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:36:44,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:36:45,194 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 67 for LOIs [2023-11-23 20:36:45,381 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:36:47,508 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 [2023-11-23 20:36:47,508 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:36:47,508 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:36:47,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-23 20:36:47,509 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529625717] [2023-11-23 20:36:47,509 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:36:47,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:36:47,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:47,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:36:47,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=353, Unknown=1, NotChecked=38, Total=462 [2023-11-23 20:36:47,511 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) [2023-11-23 20:36:47,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:47,844 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2023-11-23 20:36:47,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:36:47,845 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 [2023-11-23 20:36:47,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:47,846 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:36:47,846 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:36:47,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=88, Invalid=421, Unknown=1, NotChecked=42, Total=552 [2023-11-23 20:36:47,847 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 [2023-11-23 20:36:47,848 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] [2023-11-23 20:36:47,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:36:47,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2023-11-23 20:36:47,854 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) [2023-11-23 20:36:47,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2023-11-23 20:36:47,856 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 15 [2023-11-23 20:36:47,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:47,858 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2023-11-23 20:36:47,858 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) [2023-11-23 20:36:47,859 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2023-11-23 20:36:47,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 20:36:47,859 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:47,860 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:47,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:48,060 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:48,060 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)] === [2023-11-23 20:36:48,061 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:48,061 INFO L85 PathProgramCache]: Analyzing trace with hash -717837351, now seen corresponding path program 1 times [2023-11-23 20:36:48,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:48,061 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879742121] [2023-11-23 20:36:48,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:48,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:48,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:48,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:48,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:48,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879742121] [2023-11-23 20:36:48,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879742121] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:48,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78228589] [2023-11-23 20:36:48,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:48,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:48,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:48,456 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:48,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:36:48,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:48,550 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-23 20:36:48,553 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:48,566 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:36:48,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:36:48,729 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 [2023-11-23 20:36:48,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:36:48,775 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 [2023-11-23 20:36:48,787 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:36:48,787 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 20:36:48,808 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2023-11-23 20:36:48,809 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:36:48,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78228589] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:48,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [514976850] [2023-11-23 20:36:48,942 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 20:36:48,942 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:36:48,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:36:48,943 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:36:48,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:36:49,212 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 67 for LOIs [2023-11-23 20:36:49,320 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:36:51,605 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 [2023-11-23 20:36:51,605 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:36:51,605 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:36:51,605 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-11-23 20:36:51,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239026160] [2023-11-23 20:36:51,606 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:36:51,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 20:36:51,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:51,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 20:36:51,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=652, Unknown=1, NotChecked=52, Total=812 [2023-11-23 20:36:51,608 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) [2023-11-23 20:36:52,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:52,050 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2023-11-23 20:36:52,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:36:52,051 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 [2023-11-23 20:36:52,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:52,052 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:36:52,052 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:36:52,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=128, Invalid=745, Unknown=1, NotChecked=56, Total=930 [2023-11-23 20:36:52,053 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 11 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:52,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 273 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 362 Invalid, 0 Unknown, 71 Unchecked, 0.3s Time] [2023-11-23 20:36:52,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:36:52,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2023-11-23 20:36:52,059 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) [2023-11-23 20:36:52,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 73 transitions. [2023-11-23 20:36:52,061 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 73 transitions. Word has length 15 [2023-11-23 20:36:52,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:52,061 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 73 transitions. [2023-11-23 20:36:52,062 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) [2023-11-23 20:36:52,062 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 73 transitions. [2023-11-23 20:36:52,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 20:36:52,063 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:52,063 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:52,089 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-23 20:36:52,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 20:36:52,284 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)] === [2023-11-23 20:36:52,285 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:52,285 INFO L85 PathProgramCache]: Analyzing trace with hash 112698123, now seen corresponding path program 1 times [2023-11-23 20:36:52,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:52,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617102300] [2023-11-23 20:36:52,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:52,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:52,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:52,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:52,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:52,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617102300] [2023-11-23 20:36:52,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617102300] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:52,588 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:52,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2023-11-23 20:36:52,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712622577] [2023-11-23 20:36:52,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:52,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:36:52,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:52,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:36:52,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:36:52,591 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) [2023-11-23 20:36:52,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:52,956 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2023-11-23 20:36:52,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 20:36:52,957 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 [2023-11-23 20:36:52,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:52,958 INFO L225 Difference]: With dead ends: 89 [2023-11-23 20:36:52,958 INFO L226 Difference]: Without dead ends: 89 [2023-11-23 20:36:52,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2023-11-23 20:36:52,960 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, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:52,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 207 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:36:52,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-23 20:36:52,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 66. [2023-11-23 20:36:52,965 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) [2023-11-23 20:36:52,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2023-11-23 20:36:52,967 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 20 [2023-11-23 20:36:52,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:52,967 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2023-11-23 20:36:52,967 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) [2023-11-23 20:36:52,967 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2023-11-23 20:36:52,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 20:36:52,969 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:52,969 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:36:52,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-23 20:36:52,969 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)] === [2023-11-23 20:36:52,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:52,970 INFO L85 PathProgramCache]: Analyzing trace with hash 112698124, now seen corresponding path program 1 times [2023-11-23 20:36:52,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:52,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510285996] [2023-11-23 20:36:52,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:52,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:52,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:53,330 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:53,331 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510285996] [2023-11-23 20:36:53,331 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510285996] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:53,331 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:53,331 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-11-23 20:36:53,332 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818766847] [2023-11-23 20:36:53,332 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:53,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 20:36:53,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:53,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 20:36:53,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:36:53,334 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) [2023-11-23 20:36:53,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:53,793 INFO L93 Difference]: Finished difference Result 104 states and 120 transitions. [2023-11-23 20:36:53,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:36:53,793 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 [2023-11-23 20:36:53,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:53,796 INFO L225 Difference]: With dead ends: 104 [2023-11-23 20:36:53,796 INFO L226 Difference]: Without dead ends: 104 [2023-11-23 20:36:53,796 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 [2023-11-23 20:36:53,797 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 42 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:53,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 258 Invalid, 444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:36:53,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-11-23 20:36:53,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 75. [2023-11-23 20:36:53,808 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) [2023-11-23 20:36:53,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 88 transitions. [2023-11-23 20:36:53,809 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 88 transitions. Word has length 20 [2023-11-23 20:36:53,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:53,809 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 88 transitions. [2023-11-23 20:36:53,809 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) [2023-11-23 20:36:53,810 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 88 transitions. [2023-11-23 20:36:53,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-23 20:36:53,811 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:53,811 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] [2023-11-23 20:36:53,811 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 20:36:53,811 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)] === [2023-11-23 20:36:53,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:53,811 INFO L85 PathProgramCache]: Analyzing trace with hash -801234495, now seen corresponding path program 1 times [2023-11-23 20:36:53,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:53,812 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421799922] [2023-11-23 20:36:53,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:53,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:53,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:53,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:53,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:53,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421799922] [2023-11-23 20:36:53,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421799922] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:36:53,946 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:36:53,946 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:36:53,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740210038] [2023-11-23 20:36:53,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:36:53,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:36:53,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:53,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:36:53,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:36:53,948 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) [2023-11-23 20:36:54,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:54,058 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2023-11-23 20:36:54,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:36:54,058 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 [2023-11-23 20:36:54,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:54,059 INFO L225 Difference]: With dead ends: 78 [2023-11-23 20:36:54,060 INFO L226 Difference]: Without dead ends: 78 [2023-11-23 20:36:54,060 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 [2023-11-23 20:36:54,061 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 [2023-11-23 20:36:54,061 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] [2023-11-23 20:36:54,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-23 20:36:54,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 75. [2023-11-23 20:36:54,070 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) [2023-11-23 20:36:54,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 86 transitions. [2023-11-23 20:36:54,072 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 86 transitions. Word has length 21 [2023-11-23 20:36:54,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:54,072 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 86 transitions. [2023-11-23 20:36:54,072 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) [2023-11-23 20:36:54,072 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 86 transitions. [2023-11-23 20:36:54,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:36:54,078 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:54,078 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] [2023-11-23 20:36:54,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 20:36:54,078 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)] === [2023-11-23 20:36:54,079 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:54,079 INFO L85 PathProgramCache]: Analyzing trace with hash 983290782, now seen corresponding path program 1 times [2023-11-23 20:36:54,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:54,079 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836794196] [2023-11-23 20:36:54,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:54,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:54,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:54,286 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:54,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:54,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836794196] [2023-11-23 20:36:54,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836794196] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:54,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299861604] [2023-11-23 20:36:54,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:54,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:54,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:54,289 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:54,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:36:54,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:54,397 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:36:54,403 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:54,409 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:36:54,439 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_internal_~pi~1.base 1))) is different from true [2023-11-23 20:36:54,454 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 20:36:54,454 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2023-11-23 20:36:54,466 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-23 20:36:54,466 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:36:54,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:54,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299861604] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:36:54,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220018704] [2023-11-23 20:36:54,601 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-23 20:36:54,601 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:36:54,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:36:54,601 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:36:54,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:36:54,960 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 107 for LOIs [2023-11-23 20:36:55,061 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 20:36:55,074 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:36:58,052 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1677#(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_#memory_$Pointer$.offset_98| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_98| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_98| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_113| (Array Int Int))) (= (select |v_#valid_113| |ULTIMATE.start_create_#res#1.base|) 0)) (exists ((|v_#valid_114| (Array Int Int))) (and (= |#valid| (store |v_#valid_114| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)) (= (select |v_#valid_114| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#valid_116| (Array Int Int))) (= (select |v_#valid_116| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (exists ((|v_#length_91| (Array Int Int))) (= (store |v_#length_91| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.base_98| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_98| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_98| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_13| Int)) (and (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 0)) (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483647) (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_13| 2147483648))))) (and (not (= |ULTIMATE.start_create_#res#1.base| 0)) (exists ((|v_#memory_$Pointer$.offset_98| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_98| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_98| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_113| (Array Int Int))) (= (select |v_#valid_113| |ULTIMATE.start_create_#res#1.base|) 0)) (exists ((|v_#valid_114| (Array Int Int))) (and (= |#valid| (store |v_#valid_114| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)) (= (select |v_#valid_114| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#valid_115| (Array Int Int))) (= (select |v_#valid_115| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (exists ((|v_#length_91| (Array Int Int))) (= (store |v_#length_91| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.base_98| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_98| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_98| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (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|) (<= (+ |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) (not (= (select |#valid| |ULTIMATE.start_create_internal_~now~0#1.base|) 1)) (= |ULTIMATE.start_create_internal_~sll~0#1.offset| 0))' at error location [2023-11-23 20:36:58,052 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:36:58,052 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:36:58,052 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 6] total 10 [2023-11-23 20:36:58,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524755422] [2023-11-23 20:36:58,053 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:36:58,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:36:58,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:36:58,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:36:58,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=619, Unknown=1, NotChecked=50, Total=756 [2023-11-23 20:36:58,055 INFO L87 Difference]: Start difference. First operand 75 states and 86 transitions. Second operand has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:36:58,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:36:58,438 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2023-11-23 20:36:58,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:36:58,438 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 22 [2023-11-23 20:36:58,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:36:58,440 INFO L225 Difference]: With dead ends: 80 [2023-11-23 20:36:58,440 INFO L226 Difference]: Without dead ends: 80 [2023-11-23 20:36:58,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=103, Invalid=712, Unknown=1, NotChecked=54, Total=870 [2023-11-23 20:36:58,441 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 8 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:36:58,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 222 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 261 Invalid, 0 Unknown, 70 Unchecked, 0.2s Time] [2023-11-23 20:36:58,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-23 20:36:58,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2023-11-23 20:36:58,446 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) [2023-11-23 20:36:58,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2023-11-23 20:36:58,448 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 22 [2023-11-23 20:36:58,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:36:58,448 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2023-11-23 20:36:58,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.75) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:36:58,449 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2023-11-23 20:36:58,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:36:58,450 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:36:58,450 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] [2023-11-23 20:36:58,482 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:36:58,651 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 20:36:58,651 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)] === [2023-11-23 20:36:58,652 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:36:58,652 INFO L85 PathProgramCache]: Analyzing trace with hash 983290783, now seen corresponding path program 1 times [2023-11-23 20:36:58,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:36:58,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134176544] [2023-11-23 20:36:58,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:58,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:36:58,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:59,037 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:59,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:36:59,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134176544] [2023-11-23 20:36:59,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134176544] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:36:59,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012987561] [2023-11-23 20:36:59,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:36:59,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:36:59,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:36:59,045 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:36:59,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:36:59,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:36:59,154 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 20:36:59,158 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:36:59,167 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:36:59,285 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_internal_~pi~1.base Int)) (= (store |c_old(#length)| alloc_and_zero_internal_~pi~1.base 8) |c_#length|)) is different from true [2023-11-23 20:36:59,311 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 20:36:59,311 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2023-11-23 20:36:59,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-23 20:36:59,338 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:36:59,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:36:59,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012987561] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:36:59,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [281680428] [2023-11-23 20:36:59,628 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-23 20:36:59,629 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:36:59,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:36:59,629 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:36:59,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:00,023 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 103 for LOIs [2023-11-23 20:37:00,091 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 20:37:00,105 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:03,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2003#(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_133| (Array Int Int))) (and (= (select |v_#valid_133| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0) (= |#valid| (store |v_#valid_133| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1)))) (exists ((|v_#memory_$Pointer$.offset_122| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_122| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_122| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_122| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_122| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_122| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)) |#memory_$Pointer$.base|)) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_15| Int)) (and (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 2147483647) (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 0)) (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 2147483648)))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#valid_135| (Array Int Int))) (= (select |v_#valid_135| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (not (= |ULTIMATE.start_create_internal_#t~ret7#1.base| 0)) (= |ULTIMATE.start_main_~l~0#1.base| |ULTIMATE.start_create_#res#1.base|) (<= (+ |ULTIMATE.start_create_internal_~sll~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_132| (Array Int Int))) (= (select |v_#valid_132| |ULTIMATE.start_create_#res#1.base|) 0)) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#length_118| (Array Int Int))) (= |#length| (store |v_#length_118| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8)))) (and (not (= |ULTIMATE.start_create_#res#1.base| 0)) (not (= |ULTIMATE.start_create_internal_~sll~0#1.base| 0)) (<= (+ |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_133| (Array Int Int))) (= (select |v_#valid_133| |ULTIMATE.start_create_internal_~sll~0#1.base|) 0)) (exists ((|v_#memory_$Pointer$.base_120| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_120| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.base_120| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (exists ((|v_#memory_$Pointer$.offset_120| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_120| |ULTIMATE.start_create_internal_#t~ret7#1.base| (store (select |v_#memory_$Pointer$.offset_120| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0 0)))) (exists ((|v_ULTIMATE.start_create_internal_#t~nondet6#1_15| Int)) (and (<= |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 2147483647) (not (= |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 0)) (<= 0 (+ |v_ULTIMATE.start_create_internal_#t~nondet6#1_15| 2147483648)))) (= |ULTIMATE.start_create_internal_~sll~0#1.base| |ULTIMATE.start_create_internal_~now~0#1.base|) (exists ((|v_#length_117| (Array Int Int))) (= (store |v_#length_117| |ULTIMATE.start_create_internal_#t~ret7#1.base| 8) |#length|)) (exists ((|v_#valid_134| (Array Int Int))) (and (= (store |v_#valid_134| |ULTIMATE.start_create_internal_#t~ret7#1.base| 1) |#valid|) (= (select |v_#valid_134| |ULTIMATE.start_create_internal_#t~ret7#1.base|) 0))) (= (select |ULTIMATE.start_main_old_#valid#1| 0) 0) (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_132| (Array Int Int))) (= (select |v_#valid_132| |ULTIMATE.start_create_#res#1.base|) 0)) (<= (+ |ULTIMATE.start_create_#res#1.base| 1) |#StackHeapBarrier|))) (= |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 [2023-11-23 20:37:03,672 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:03,672 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:37:03,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 20 [2023-11-23 20:37:03,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326887924] [2023-11-23 20:37:03,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:03,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-23 20:37:03,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:03,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-23 20:37:03,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1202, Unknown=1, NotChecked=70, Total=1406 [2023-11-23 20:37:03,677 INFO L87 Difference]: Start difference. First operand 78 states and 92 transitions. Second operand has 21 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 4 states have call successors, (5), 4 states have call predecessors, (5), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 20:37:04,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:04,390 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2023-11-23 20:37:04,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 20:37:04,391 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 4 states have call successors, (5), 4 states have call predecessors, (5), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) Word has length 22 [2023-11-23 20:37:04,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:04,392 INFO L225 Difference]: With dead ends: 79 [2023-11-23 20:37:04,392 INFO L226 Difference]: Without dead ends: 79 [2023-11-23 20:37:04,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=176, Invalid=1549, Unknown=1, NotChecked=80, Total=1806 [2023-11-23 20:37:04,394 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 11 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 414 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:04,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 385 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 414 Invalid, 0 Unknown, 69 Unchecked, 0.4s Time] [2023-11-23 20:37:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-23 20:37:04,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2023-11-23 20:37:04,397 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) [2023-11-23 20:37:04,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 90 transitions. [2023-11-23 20:37:04,398 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 90 transitions. Word has length 22 [2023-11-23 20:37:04,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:04,403 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 90 transitions. [2023-11-23 20:37:04,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 4 states have call successors, (5), 4 states have call predecessors, (5), 7 states have return successors, (7), 7 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 20:37:04,404 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 90 transitions. [2023-11-23 20:37:04,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 20:37:04,406 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:04,407 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:04,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:04,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 20:37:04,616 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)] === [2023-11-23 20:37:04,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:04,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1274515879, now seen corresponding path program 1 times [2023-11-23 20:37:04,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:04,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979065437] [2023-11-23 20:37:04,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:04,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:04,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:05,251 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:05,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:05,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979065437] [2023-11-23 20:37:05,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979065437] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:05,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792091753] [2023-11-23 20:37:05,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:05,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:05,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:05,253 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:05,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:37:05,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:05,350 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 59 conjunts are in the unsatisfiable core [2023-11-23 20:37:05,363 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:05,370 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:37:05,399 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:05,403 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:05,419 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 [2023-11-23 20:37:05,425 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 [2023-11-23 20:37:05,631 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$.base)| alloc_and_zero_internal_~pi~1.base) 0 0))) (= (store |c_old(#memory_$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))) is different from true [2023-11-23 20:37:05,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:05,645 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 19 treesize of output 18 [2023-11-23 20:37:05,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:05,653 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 20:37:05,664 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:37:05,665 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 20:37:05,838 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-11-23 20:37:05,839 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 [2023-11-23 20:37:05,860 INFO L349 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2023-11-23 20:37:05,861 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 1 case distinctions, treesize of input 34 treesize of output 27 [2023-11-23 20:37:05,926 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:05,926 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:06,341 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792091753] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:06,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [930309023] [2023-11-23 20:37:06,343 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-23 20:37:06,343 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:06,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:06,344 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:06,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:06,850 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 52 for LOIs [2023-11-23 20:37:06,867 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 20:37:06,879 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:09,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2309#(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 [2023-11-23 20:37:09,099 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:09,099 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:09,099 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 24 [2023-11-23 20:37:09,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522021550] [2023-11-23 20:37:09,099 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:09,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-23 20:37:09,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:09,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-23 20:37:09,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=1833, Unknown=1, NotChecked=86, Total=2070 [2023-11-23 20:37:09,102 INFO L87 Difference]: Start difference. First operand 77 states and 90 transitions. Second operand has 24 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 21 states have internal predecessors, (35), 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) [2023-11-23 20:37:12,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:12,262 INFO L93 Difference]: Finished difference Result 79 states and 93 transitions. [2023-11-23 20:37:12,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 20:37:12,263 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 21 states have internal predecessors, (35), 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 [2023-11-23 20:37:12,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:12,266 INFO L225 Difference]: With dead ends: 79 [2023-11-23 20:37:12,266 INFO L226 Difference]: Without dead ends: 79 [2023-11-23 20:37:12,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 617 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=192, Invalid=2360, Unknown=2, NotChecked=98, Total=2652 [2023-11-23 20:37:12,269 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 9 mSDsluCounter, 478 mSDsCounter, 0 mSdLazyCounter, 546 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 518 SdHoareTripleChecker+Invalid, 634 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 546 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 81 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:12,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 518 Invalid, 634 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 546 Invalid, 0 Unknown, 81 Unchecked, 0.7s Time] [2023-11-23 20:37:12,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-23 20:37:12,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2023-11-23 20:37:12,278 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) [2023-11-23 20:37:12,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 91 transitions. [2023-11-23 20:37:12,280 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 91 transitions. Word has length 23 [2023-11-23 20:37:12,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:12,282 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 91 transitions. [2023-11-23 20:37:12,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 21 states have internal predecessors, (35), 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) [2023-11-23 20:37:12,282 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 91 transitions. [2023-11-23 20:37:12,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:37:12,286 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:12,286 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:12,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:12,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:12,500 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)] === [2023-11-23 20:37:12,501 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:12,501 INFO L85 PathProgramCache]: Analyzing trace with hash -1978553128, now seen corresponding path program 1 times [2023-11-23 20:37:12,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:12,501 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [654291597] [2023-11-23 20:37:12,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:12,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:12,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:12,860 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:12,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:12,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [654291597] [2023-11-23 20:37:12,861 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [654291597] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:12,861 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804881086] [2023-11-23 20:37:12,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:12,861 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:12,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:12,863 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:12,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:37:12,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:13,000 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 20:37:13,005 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:13,011 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:37:13,046 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-23 20:37:13,051 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 [2023-11-23 20:37:13,069 WARN L876 $PredicateComparison]: unable to prove that (exists ((alloc_and_zero_~pi~0.base Int)) (= |c_#valid| (store |c_old(#valid)| alloc_and_zero_~pi~0.base 1))) is different from true [2023-11-23 20:37:13,092 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 20:37:13,093 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2023-11-23 20:37:13,112 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2023-11-23 20:37:13,112 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:13,303 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:13,303 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804881086] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:37:13,303 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [985017168] [2023-11-23 20:37:13,306 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 20:37:13,306 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:13,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:13,306 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:13,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:14,176 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 22 for LOIs [2023-11-23 20:37:14,206 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:15,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2648#(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 [2023-11-23 20:37:15,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:15,956 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:37:15,956 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 7] total 12 [2023-11-23 20:37:15,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430351498] [2023-11-23 20:37:15,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:15,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 20:37:15,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:15,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 20:37:15,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=433, Unknown=1, NotChecked=42, Total=552 [2023-11-23 20:37:15,958 INFO L87 Difference]: Start difference. First operand 78 states and 91 transitions. Second operand has 13 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:37:16,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:16,356 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2023-11-23 20:37:16,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 20:37:16,357 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 24 [2023-11-23 20:37:16,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:16,358 INFO L225 Difference]: With dead ends: 77 [2023-11-23 20:37:16,358 INFO L226 Difference]: Without dead ends: 77 [2023-11-23 20:37:16,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=93, Invalid=560, Unknown=1, NotChecked=48, Total=702 [2023-11-23 20:37:16,359 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 9 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:16,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 250 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 275 Invalid, 0 Unknown, 66 Unchecked, 0.3s Time] [2023-11-23 20:37:16,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-23 20:37:16,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-23 20:37:16,364 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) [2023-11-23 20:37:16,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 90 transitions. [2023-11-23 20:37:16,365 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 90 transitions. Word has length 24 [2023-11-23 20:37:16,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:16,365 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 90 transitions. [2023-11-23 20:37:16,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 2.4) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-23 20:37:16,366 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 90 transitions. [2023-11-23 20:37:16,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:37:16,367 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:16,367 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:16,393 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-23 20:37:16,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:16,588 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)] === [2023-11-23 20:37:16,588 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:16,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1978553127, now seen corresponding path program 1 times [2023-11-23 20:37:16,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:16,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312013389] [2023-11-23 20:37:16,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:16,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:16,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:17,135 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:17,135 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:17,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312013389] [2023-11-23 20:37:17,136 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312013389] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:17,136 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171412876] [2023-11-23 20:37:17,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:17,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:17,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:17,141 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:17,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:37:17,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:17,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 33 conjunts are in the unsatisfiable core [2023-11-23 20:37:17,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:17,301 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:37:17,311 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:37:17,433 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-23 20:37:17,439 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:17,488 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 [2023-11-23 20:37:17,565 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 [2023-11-23 20:37:17,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:17,591 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 [2023-11-23 20:37:17,607 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:37:17,607 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 [2023-11-23 20:37:17,642 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 3 not checked. [2023-11-23 20:37:17,642 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:17,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171412876] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:17,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2118359263] [2023-11-23 20:37:17,776 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 20:37:17,777 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:17,777 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:17,777 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:17,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:18,445 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 22 for LOIs [2023-11-23 20:37:18,474 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:20,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2916#(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 [2023-11-23 20:37:20,320 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:20,320 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:20,320 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2023-11-23 20:37:20,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081699814] [2023-11-23 20:37:20,321 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:20,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-23 20:37:20,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:20,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-23 20:37:20,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=831, Unknown=1, NotChecked=58, Total=992 [2023-11-23 20:37:20,323 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) [2023-11-23 20:37:20,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:20,870 INFO L93 Difference]: Finished difference Result 75 states and 88 transitions. [2023-11-23 20:37:20,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:37:20,870 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 [2023-11-23 20:37:20,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:20,871 INFO L225 Difference]: With dead ends: 75 [2023-11-23 20:37:20,871 INFO L226 Difference]: Without dead ends: 75 [2023-11-23 20:37:20,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 264 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=140, Invalid=1053, Unknown=1, NotChecked=66, Total=1260 [2023-11-23 20:37:20,873 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 8 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 65 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:20,873 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 293 Invalid, 441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 363 Invalid, 0 Unknown, 65 Unchecked, 0.3s Time] [2023-11-23 20:37:20,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-23 20:37:20,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2023-11-23 20:37:20,878 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) [2023-11-23 20:37:20,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 84 transitions. [2023-11-23 20:37:20,879 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 84 transitions. Word has length 24 [2023-11-23 20:37:20,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:20,879 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 84 transitions. [2023-11-23 20:37:20,879 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) [2023-11-23 20:37:20,879 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 84 transitions. [2023-11-23 20:37:20,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:37:20,880 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:20,880 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] [2023-11-23 20:37:20,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:21,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 20:37:21,089 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)] === [2023-11-23 20:37:21,089 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:21,089 INFO L85 PathProgramCache]: Analyzing trace with hash -855195597, now seen corresponding path program 1 times [2023-11-23 20:37:21,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:21,089 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1868373289] [2023-11-23 20:37:21,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:21,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:21,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:21,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:21,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:21,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1868373289] [2023-11-23 20:37:21,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1868373289] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:21,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102494990] [2023-11-23 20:37:21,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:21,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:21,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:21,176 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:21,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:37:21,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:21,302 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-23 20:37:21,311 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:21,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:21,327 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:21,344 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-23 20:37:21,344 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 [2023-11-23 20:37:21,361 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:21,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2102494990] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:37:21,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2088247697] [2023-11-23 20:37:21,364 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-11-23 20:37:21,364 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:21,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:21,365 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:21,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:21,926 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero_internal with input of size 52 for LOIs [2023-11-23 20:37:21,959 INFO L197 IcfgInterpreter]: Interpreting procedure alloc_and_zero with input of size 19 for LOIs [2023-11-23 20:37:21,984 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:24,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3226#(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 [2023-11-23 20:37:24,001 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:24,001 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:37:24,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 5 [2023-11-23 20:37:24,001 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398253838] [2023-11-23 20:37:24,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:24,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:37:24,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:24,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:37:24,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:37:24,003 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) [2023-11-23 20:37:24,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:24,154 INFO L93 Difference]: Finished difference Result 94 states and 106 transitions. [2023-11-23 20:37:24,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:37:24,154 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 [2023-11-23 20:37:24,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:24,156 INFO L225 Difference]: With dead ends: 94 [2023-11-23 20:37:24,156 INFO L226 Difference]: Without dead ends: 94 [2023-11-23 20:37:24,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=66, Invalid=690, Unknown=0, NotChecked=0, Total=756 [2023-11-23 20:37:24,157 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 38 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:24,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 114 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:24,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-23 20:37:24,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 73. [2023-11-23 20:37:24,161 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) [2023-11-23 20:37:24,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2023-11-23 20:37:24,162 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 24 [2023-11-23 20:37:24,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:24,163 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2023-11-23 20:37:24,163 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) [2023-11-23 20:37:24,163 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2023-11-23 20:37:24,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:37:24,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:24,164 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] [2023-11-23 20:37:24,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:24,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-23 20:37:24,379 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)] === [2023-11-23 20:37:24,379 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:24,380 INFO L85 PathProgramCache]: Analyzing trace with hash -855195596, now seen corresponding path program 1 times [2023-11-23 20:37:24,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:24,380 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842543173] [2023-11-23 20:37:24,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:24,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:24,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:24,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:24,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:24,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842543173] [2023-11-23 20:37:24,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842543173] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:24,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381477782] [2023-11-23 20:37:24,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:24,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:24,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:24,644 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:24,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 20:37:24,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:24,779 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 20:37:24,782 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:24,792 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:37:24,798 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:37:25,004 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 [2023-11-23 20:37:25,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:25,025 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 [2023-11-23 20:37:25,042 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:37:25,043 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 20:37:25,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:25,095 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:37:25,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381477782] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:25,095 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:37:25,095 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10] total 17 [2023-11-23 20:37:25,095 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728215627] [2023-11-23 20:37:25,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:25,096 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:37:25,096 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:25,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:37:25,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=231, Unknown=1, NotChecked=30, Total=306 [2023-11-23 20:37:25,097 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 11 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 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) [2023-11-23 20:37:25,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:25,486 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2023-11-23 20:37:25,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 20:37:25,487 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 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 24 [2023-11-23 20:37:25,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:25,488 INFO L225 Difference]: With dead ends: 102 [2023-11-23 20:37:25,488 INFO L226 Difference]: Without dead ends: 102 [2023-11-23 20:37:25,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=290, Unknown=1, NotChecked=34, Total=380 [2023-11-23 20:37:25,489 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 37 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 147 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:25,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 168 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 328 Invalid, 0 Unknown, 147 Unchecked, 0.3s Time] [2023-11-23 20:37:25,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2023-11-23 20:37:25,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 76. [2023-11-23 20:37:25,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 53 states have (on average 1.490566037735849) internal successors, (79), 67 states have internal predecessors, (79), 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) [2023-11-23 20:37:25,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 91 transitions. [2023-11-23 20:37:25,493 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 91 transitions. Word has length 24 [2023-11-23 20:37:25,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:25,494 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 91 transitions. [2023-11-23 20:37:25,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.5) internal successors, (20), 9 states have internal predecessors, (20), 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) [2023-11-23 20:37:25,494 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 91 transitions. [2023-11-23 20:37:25,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 20:37:25,495 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:25,495 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] [2023-11-23 20:37:25,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:25,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-23 20:37:25,712 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)] === [2023-11-23 20:37:25,713 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:25,713 INFO L85 PathProgramCache]: Analyzing trace with hash -741185925, now seen corresponding path program 1 times [2023-11-23 20:37:25,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:25,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928240507] [2023-11-23 20:37:25,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:25,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:25,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:25,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:25,815 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:25,816 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928240507] [2023-11-23 20:37:25,816 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928240507] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:25,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:25,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:37:25,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469850867] [2023-11-23 20:37:25,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:25,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:37:25,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:25,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:37:25,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:37:25,817 INFO L87 Difference]: Start difference. First operand 76 states and 91 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) [2023-11-23 20:37:25,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:25,945 INFO L93 Difference]: Finished difference Result 82 states and 94 transitions. [2023-11-23 20:37:25,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:37:25,946 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 [2023-11-23 20:37:25,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:25,947 INFO L225 Difference]: With dead ends: 82 [2023-11-23 20:37:25,947 INFO L226 Difference]: Without dead ends: 82 [2023-11-23 20:37:25,947 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 [2023-11-23 20:37:25,948 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 48 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:25,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 236 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:25,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-23 20:37:25,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2023-11-23 20:37:25,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 53 states have (on average 1.4528301886792452) internal successors, (77), 67 states have internal predecessors, (77), 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) [2023-11-23 20:37:25,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 89 transitions. [2023-11-23 20:37:25,952 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 89 transitions. Word has length 25 [2023-11-23 20:37:25,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:25,952 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 89 transitions. [2023-11-23 20:37:25,953 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) [2023-11-23 20:37:25,953 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 89 transitions. [2023-11-23 20:37:25,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 20:37:25,953 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:25,954 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] [2023-11-23 20:37:25,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-23 20:37:25,954 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)] === [2023-11-23 20:37:25,954 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:25,955 INFO L85 PathProgramCache]: Analyzing trace with hash -1504156242, now seen corresponding path program 1 times [2023-11-23 20:37:25,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:25,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206004791] [2023-11-23 20:37:25,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:25,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:25,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:26,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:26,088 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:26,088 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206004791] [2023-11-23 20:37:26,088 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206004791] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:26,089 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:26,089 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 20:37:26,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816715172] [2023-11-23 20:37:26,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:26,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:37:26,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:26,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:37:26,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:37:26,090 INFO L87 Difference]: Start difference. First operand 76 states and 89 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) [2023-11-23 20:37:26,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:26,278 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2023-11-23 20:37:26,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:37:26,279 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 [2023-11-23 20:37:26,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:26,280 INFO L225 Difference]: With dead ends: 80 [2023-11-23 20:37:26,280 INFO L226 Difference]: Without dead ends: 80 [2023-11-23 20:37:26,280 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 [2023-11-23 20:37:26,281 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 42 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:26,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 174 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:37:26,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2023-11-23 20:37:26,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 78. [2023-11-23 20:37:26,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.4545454545454546) internal successors, (80), 69 states have internal predecessors, (80), 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) [2023-11-23 20:37:26,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 92 transitions. [2023-11-23 20:37:26,286 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 92 transitions. Word has length 26 [2023-11-23 20:37:26,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:26,288 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 92 transitions. [2023-11-23 20:37:26,288 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) [2023-11-23 20:37:26,288 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 92 transitions. [2023-11-23 20:37:26,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 20:37:26,289 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:26,289 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] [2023-11-23 20:37:26,290 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-23 20:37:26,290 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)] === [2023-11-23 20:37:26,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:26,290 INFO L85 PathProgramCache]: Analyzing trace with hash 657829439, now seen corresponding path program 1 times [2023-11-23 20:37:26,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:26,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144536554] [2023-11-23 20:37:26,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:26,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:26,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:27,022 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:27,022 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:27,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144536554] [2023-11-23 20:37:27,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144536554] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:27,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986178872] [2023-11-23 20:37:27,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:27,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:27,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:27,025 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:27,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_33e1e076-84fa-4915-ac56-37119aea3271/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-23 20:37:27,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:27,200 INFO L262 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 61 conjunts are in the unsatisfiable core [2023-11-23 20:37:27,209 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:27,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:37:27,224 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 20:37:27,599 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 20:37:27,600 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 13 [2023-11-23 20:37:27,637 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-23 20:37:27,638 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-11-23 20:37:27,832 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 [2023-11-23 20:37:27,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:27,856 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 [2023-11-23 20:37:27,885 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-11-23 20:37:27,885 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 [2023-11-23 20:37:28,000 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2023-11-23 20:37:28,000 INFO L327 TraceCheckSpWp]: Computing backward predicates...