./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/insertion_sort-2-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/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_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/insertion_sort-2-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f08b02f494e898be2e8c5098de245f701022f3f8b39ac6682b3bca3a03512826 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:21:40,682 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:21:40,796 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:21:40,808 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:21:40,809 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:21:40,857 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:21:40,858 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:21:40,859 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:21:40,860 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:21:40,865 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:21:40,866 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:21:40,866 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:21:40,867 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:21:40,868 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:21:40,869 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:21:40,869 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:21:40,870 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:21:40,870 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:21:40,871 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:21:40,871 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:21:40,872 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:21:40,872 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:21:40,874 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:21:40,874 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:21:40,875 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:21:40,875 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:21:40,875 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:21:40,876 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:21:40,876 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:21:40,877 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:21:40,878 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:21:40,879 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:21:40,879 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:21:40,879 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:21:40,880 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:21:40,880 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:21:40,880 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:21:40,880 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:40,881 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:21:40,881 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:21:40,881 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:21:40,882 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:21:40,882 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:21:40,882 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:21:40,883 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:21:40,883 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:21:40,884 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:21:40,884 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_a36c6175-5dda-462a-b34e-fc3037721640/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f08b02f494e898be2e8c5098de245f701022f3f8b39ac6682b3bca3a03512826 [2023-11-23 21:21:41,189 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:21:41,224 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:21:41,226 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:21:41,229 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:21:41,229 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:21:41,231 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/loops/insertion_sort-2-2.c [2023-11-23 21:21:44,370 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:21:44,627 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:21:44,628 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/sv-benchmarks/c/loops/insertion_sort-2-2.c [2023-11-23 21:21:44,636 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/data/8fbac324e/bed5511e0b7448418867270ecab69938/FLAGc1290209a [2023-11-23 21:21:44,656 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/data/8fbac324e/bed5511e0b7448418867270ecab69938 [2023-11-23 21:21:44,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:21:44,665 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:21:44,669 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:44,669 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:21:44,675 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:21:44,676 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:44,677 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8b4a10d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44, skipping insertion in model container [2023-11-23 21:21:44,677 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:44,701 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:21:44,888 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/sv-benchmarks/c/loops/insertion_sort-2-2.c[330,343] [2023-11-23 21:21:44,928 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:44,940 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:21:44,958 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/sv-benchmarks/c/loops/insertion_sort-2-2.c[330,343] [2023-11-23 21:21:44,977 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:21:44,998 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:21:44,999 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44 WrapperNode [2023-11-23 21:21:44,999 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:21:45,000 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:45,000 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:21:45,000 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:21:45,008 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,020 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,044 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 86 [2023-11-23 21:21:45,044 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:21:45,045 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:21:45,045 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:21:45,045 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:21:45,055 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,055 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,058 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,058 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,066 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,070 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,071 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,072 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,075 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:21:45,076 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:21:45,076 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:21:45,083 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:21:45,084 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (1/1) ... [2023-11-23 21:21:45,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:21:45,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:45,121 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:21:45,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:21:45,164 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:21:45,164 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:21:45,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:21:45,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:21:45,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:21:45,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:21:45,165 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:21:45,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:21:45,242 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:21:45,245 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:21:45,420 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:21:45,469 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:21:45,470 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:21:45,471 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:45 BoogieIcfgContainer [2023-11-23 21:21:45,472 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:21:45,474 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:21:45,475 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:21:45,478 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:21:45,479 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:21:44" (1/3) ... [2023-11-23 21:21:45,479 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6277e208 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:45, skipping insertion in model container [2023-11-23 21:21:45,480 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:44" (2/3) ... [2023-11-23 21:21:45,480 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6277e208 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:45, skipping insertion in model container [2023-11-23 21:21:45,480 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:45" (3/3) ... [2023-11-23 21:21:45,482 INFO L112 eAbstractionObserver]: Analyzing ICFG insertion_sort-2-2.c [2023-11-23 21:21:45,503 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:21:45,503 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:21:45,551 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:21:45,559 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6e0a7127, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:21:45,559 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:21:45,564 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:45,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:21:45,570 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:45,571 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:45,572 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:45,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:45,581 INFO L85 PathProgramCache]: Analyzing trace with hash 157595850, now seen corresponding path program 1 times [2023-11-23 21:21:45,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:45,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065049438] [2023-11-23 21:21:45,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:45,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:45,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:46,099 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 21:21:46,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:46,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065049438] [2023-11-23 21:21:46,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2065049438] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:46,101 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:46,102 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:21:46,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173078835] [2023-11-23 21:21:46,104 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:46,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:21:46,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:46,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:21:46,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:21:46,169 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:46,267 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2023-11-23 21:21:46,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:21:46,269 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:21:46,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:46,277 INFO L225 Difference]: With dead ends: 31 [2023-11-23 21:21:46,278 INFO L226 Difference]: Without dead ends: 16 [2023-11-23 21:21:46,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:21:46,286 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:46,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 20 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:46,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-23 21:21:46,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2023-11-23 21:21:46,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-23 21:21:46,325 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 7 [2023-11-23 21:21:46,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:46,326 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-23 21:21:46,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,327 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-23 21:21:46,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:21:46,327 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:46,328 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:46,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:21:46,328 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:46,329 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:46,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1532339446, now seen corresponding path program 1 times [2023-11-23 21:21:46,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:46,330 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988490658] [2023-11-23 21:21:46,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:46,330 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:46,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:46,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:46,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:46,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988490658] [2023-11-23 21:21:46,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988490658] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:21:46,665 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:21:46,666 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:21:46,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125693169] [2023-11-23 21:21:46,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:21:46,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:21:46,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:46,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:21:46,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:21:46,670 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:46,732 INFO L93 Difference]: Finished difference Result 24 states and 30 transitions. [2023-11-23 21:21:46,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:21:46,733 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:21:46,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:46,734 INFO L225 Difference]: With dead ends: 24 [2023-11-23 21:21:46,734 INFO L226 Difference]: Without dead ends: 14 [2023-11-23 21:21:46,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:21:46,736 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:46,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:21:46,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-23 21:21:46,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-23 21:21:46,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-23 21:21:46,741 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 11 [2023-11-23 21:21:46,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:46,742 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-23 21:21:46,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:46,742 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-23 21:21:46,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:21:46,743 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:46,743 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:46,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:21:46,743 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:46,744 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:46,744 INFO L85 PathProgramCache]: Analyzing trace with hash -915943035, now seen corresponding path program 1 times [2023-11-23 21:21:46,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:46,744 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11347295] [2023-11-23 21:21:46,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:46,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:46,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:46,926 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 21:21:46,926 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:46,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11347295] [2023-11-23 21:21:46,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11347295] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:46,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132799599] [2023-11-23 21:21:46,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:46,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:46,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:46,932 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:46,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:21:47,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:47,026 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:21:47,031 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:47,102 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 21:21:47,102 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:47,202 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 21:21:47,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132799599] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:47,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623529942] [2023-11-23 21:21:47,239 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:21:47,240 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:47,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:47,250 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:47,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:48,428 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:48,889 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '215#(and (= |ULTIMATE.start_main_~k~0#1| 1) (= |ULTIMATE.start_main_~#v~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |ULTIMATE.start_main_~j~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (<= 2 (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 4) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:21:48,890 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:48,890 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:48,890 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-23 21:21:48,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061327380] [2023-11-23 21:21:48,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:48,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:21:48,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:48,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:21:48,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:21:48,894 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:48,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:48,956 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2023-11-23 21:21:48,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:21:48,956 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-23 21:21:48,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:48,957 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:21:48,957 INFO L226 Difference]: Without dead ends: 18 [2023-11-23 21:21:48,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:21:48,960 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 9 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:48,960 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 30 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:21:48,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-23 21:21:48,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2023-11-23 21:21:48,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:48,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-23 21:21:48,965 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2023-11-23 21:21:48,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:48,966 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-23 21:21:48,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:48,966 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-23 21:21:48,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:21:48,967 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:48,967 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:48,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:49,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:49,187 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:49,188 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:49,188 INFO L85 PathProgramCache]: Analyzing trace with hash 496711382, now seen corresponding path program 2 times [2023-11-23 21:21:49,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:49,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072777596] [2023-11-23 21:21:49,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:49,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:49,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:50,038 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:50,038 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:50,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072777596] [2023-11-23 21:21:50,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072777596] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:50,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021938979] [2023-11-23 21:21:50,039 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:21:50,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:50,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:50,041 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:50,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:21:50,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:21:50,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:21:50,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-23 21:21:50,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:50,223 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-11-23 21:21:50,262 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:21:50,263 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2023-11-23 21:21:50,278 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:21:50,278 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:50,440 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 57 treesize of output 51 [2023-11-23 21:21:50,467 INFO L349 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2023-11-23 21:21:50,467 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 87 treesize of output 80 [2023-11-23 21:21:50,582 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:21:50,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021938979] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:50,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452779593] [2023-11-23 21:21:50,586 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:21:50,586 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:50,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:50,587 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:50,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:51,306 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:51,885 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '377#(and (= |ULTIMATE.start_main_~k~0#1| 1) (= |ULTIMATE.start_main_~#v~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |ULTIMATE.start_main_~j~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (<= 2 (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 4) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:21:51,885 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:51,885 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:51,885 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 9] total 19 [2023-11-23 21:21:51,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486083322] [2023-11-23 21:21:51,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:51,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-23 21:21:51,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:51,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-23 21:21:51,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2023-11-23 21:21:51,888 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:52,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:52,296 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2023-11-23 21:21:52,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 21:21:52,297 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-23 21:21:52,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:52,299 INFO L225 Difference]: With dead ends: 38 [2023-11-23 21:21:52,299 INFO L226 Difference]: Without dead ends: 36 [2023-11-23 21:21:52,300 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=208, Invalid=1124, Unknown=0, NotChecked=0, Total=1332 [2023-11-23 21:21:52,301 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 84 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:52,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 59 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:21:52,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-23 21:21:52,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 21. [2023-11-23 21:21:52,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:52,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2023-11-23 21:21:52,309 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 13 [2023-11-23 21:21:52,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:52,309 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2023-11-23 21:21:52,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:52,310 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2023-11-23 21:21:52,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-23 21:21:52,310 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:52,311 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:52,341 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:52,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:52,525 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:52,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:52,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1902769125, now seen corresponding path program 1 times [2023-11-23 21:21:52,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:52,526 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831561857] [2023-11-23 21:21:52,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:52,526 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:52,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:53,267 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:21:53,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:53,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831561857] [2023-11-23 21:21:53,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831561857] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:53,268 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011256048] [2023-11-23 21:21:53,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:53,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:53,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:53,270 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:53,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:21:53,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:53,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:21:53,349 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:53,426 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 25 treesize of output 20 [2023-11-23 21:21:53,499 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:21:53,500 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 40 treesize of output 20 [2023-11-23 21:21:53,549 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:21:53,549 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2023-11-23 21:21:53,567 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:21:53,567 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:53,756 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 75 treesize of output 65 [2023-11-23 21:21:53,776 INFO L349 Elim1Store]: treesize reduction 9, result has 47.1 percent of original size [2023-11-23 21:21:53,777 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 579 treesize of output 461 [2023-11-23 21:21:53,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:21:53,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011256048] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:53,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [466414520] [2023-11-23 21:21:53,841 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:21:53,842 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:53,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:53,842 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:53,842 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:54,455 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:21:54,681 WARN L876 $PredicateComparison]: unable to prove that (or (and (exists ((|v_ULTIMATE.start_main_~j~0#1_61| Int)) (and (let ((.cse0 (<= 1 |c_#StackHeapBarrier|)) (.cse1 (<= 2 |c_ULTIMATE.start_main_~#v~0#1.base|))) (or (and .cse0 .cse1 (<= 0 |v_ULTIMATE.start_main_~j~0#1_61|)) (and .cse0 (<= 1 |v_ULTIMATE.start_main_~j~0#1_61|) .cse1))) (<= (mod |c_ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |v_ULTIMATE.start_main_~j~0#1_61| 4294967296)))) (= |c_ULTIMATE.start_main_~j~0#1| 1) (= |c_ULTIMATE.start_main_~#v~0#1.offset| 0)) (exists ((|v_#memory_int_54| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_#t~mem9#1_49| Int) (|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_#t~mem9#1_50| Int)) (let ((.cse3 (select |v_#memory_int_54| |c_ULTIMATE.start_main_~#v~0#1.base|)) (.cse4 (* |c_ULTIMATE.start_main_~i~0#1| 4)) (.cse2 (not |v_ULTIMATE.start_main_#t~short10#1_16|))) (and (or (and .cse2 (<= (+ |c_ULTIMATE.start_main_~i~0#1| 1) 0)) (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= 0 |c_ULTIMATE.start_main_~i~0#1|))) (= (store |v_#memory_int_54| |c_ULTIMATE.start_main_~#v~0#1.base| (store .cse3 (+ .cse4 |c_ULTIMATE.start_main_~#v~0#1.offset| 4) |c_ULTIMATE.start_main_~key~0#1|)) |c_#memory_int|) (or (and |v_ULTIMATE.start_main_#t~short10#1_16| (= (select .cse3 (+ .cse4 |c_ULTIMATE.start_main_~#v~0#1.offset|)) |v_ULTIMATE.start_main_#t~mem9#1_50|) (<= |v_ULTIMATE.start_main_#t~mem9#1_50| |c_ULTIMATE.start_main_~key~0#1|)) (and .cse2 (= |v_ULTIMATE.start_main_#t~mem9#1_49| |v_ULTIMATE.start_main_#t~mem9#1_50|))))))) is different from true [2023-11-23 21:21:55,159 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '591#(and (= |ULTIMATE.start_main_~k~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) |ULTIMATE.start_main_~#v~0#1.offset|) |ULTIMATE.start_main_#t~mem13#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |ULTIMATE.start_main_~j~0#1| 4294967296)) (<= 2 (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) (+ |ULTIMATE.start_main_~#v~0#1.offset| 4)) |ULTIMATE.start_main_#t~mem14#1|) (exists ((|v_#memory_int_54| (Array Int (Array Int Int))) (|v_ULTIMATE.start_main_#t~mem9#1_49| Int) (|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_ULTIMATE.start_main_#t~mem9#1_50| Int)) (and (= |#memory_int| (store |v_#memory_int_54| |ULTIMATE.start_main_~#v~0#1.base| (store (select |v_#memory_int_54| |ULTIMATE.start_main_~#v~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |ULTIMATE.start_main_~#v~0#1.offset| 4) |ULTIMATE.start_main_~key~0#1|))) (or (and (= (select (select |v_#memory_int_54| |ULTIMATE.start_main_~#v~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) |ULTIMATE.start_main_~#v~0#1.offset|)) |v_ULTIMATE.start_main_#t~mem9#1_50|) (<= |v_ULTIMATE.start_main_#t~mem9#1_50| |ULTIMATE.start_main_~key~0#1|) |v_ULTIMATE.start_main_#t~short10#1_16|) (and (not |v_ULTIMATE.start_main_#t~short10#1_16|) (= |v_ULTIMATE.start_main_#t~mem9#1_49| |v_ULTIMATE.start_main_#t~mem9#1_50|))) (or (and (<= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (not |v_ULTIMATE.start_main_#t~short10#1_16|)) (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= 0 |ULTIMATE.start_main_~i~0#1|))))) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:21:55,159 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:21:55,159 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:21:55,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 9] total 20 [2023-11-23 21:21:55,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962174497] [2023-11-23 21:21:55,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:21:55,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-23 21:21:55,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:21:55,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-23 21:21:55,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=4, NotChecked=50, Total=756 [2023-11-23 21:21:55,162 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:57,763 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2023-11-23 21:21:58,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:21:58,394 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2023-11-23 21:21:58,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:21:58,394 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-23 21:21:58,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:21:58,395 INFO L225 Difference]: With dead ends: 59 [2023-11-23 21:21:58,395 INFO L226 Difference]: Without dead ends: 57 [2023-11-23 21:21:58,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 423 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=289, Invalid=1603, Unknown=4, NotChecked=84, Total=1980 [2023-11-23 21:21:58,397 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 112 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 10 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:21:58,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [112 Valid, 77 Invalid, 323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 312 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2023-11-23 21:21:58,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-23 21:21:58,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 21. [2023-11-23 21:21:58,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:58,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2023-11-23 21:21:58,416 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 15 [2023-11-23 21:21:58,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:21:58,417 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2023-11-23 21:21:58,419 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:21:58,419 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2023-11-23 21:21:58,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:21:58,420 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:21:58,420 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:21:58,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:21:58,639 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:58,640 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:21:58,640 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:21:58,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1371603360, now seen corresponding path program 1 times [2023-11-23 21:21:58,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:21:58,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237615044] [2023-11-23 21:21:58,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:58,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:21:58,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:58,851 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:21:58,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:21:58,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237615044] [2023-11-23 21:21:58,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237615044] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:21:58,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571946367] [2023-11-23 21:21:58,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:21:58,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:21:58,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:21:58,857 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:21:58,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:21:58,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:21:58,930 INFO L262 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:21:58,932 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:21:59,002 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:21:59,002 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:21:59,255 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:21:59,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571946367] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:21:59,256 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [666103622] [2023-11-23 21:21:59,260 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-23 21:21:59,260 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:21:59,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:21:59,261 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:21:59,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:21:59,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:00,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '848#(and (= |ULTIMATE.start_main_~#v~0#1.offset| 0) (<= (+ (mod |ULTIMATE.start_main_~k~0#1| 4294967296) 1) (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (<= 1 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem13#1| (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) (+ (* |ULTIMATE.start_main_~k~0#1| 4) (- 4)))) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) (* |ULTIMATE.start_main_~k~0#1| 4)) |ULTIMATE.start_main_#t~mem14#1|) (<= 1 |ULTIMATE.start_main_~k~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:22:00,550 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:00,550 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:00,550 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2023-11-23 21:22:00,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650930028] [2023-11-23 21:22:00,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:00,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 21:22:00,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:00,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 21:22:00,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=438, Unknown=0, NotChecked=0, Total=506 [2023-11-23 21:22:00,553 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:00,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:00,758 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2023-11-23 21:22:00,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:22:00,758 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-23 21:22:00,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:00,759 INFO L225 Difference]: With dead ends: 41 [2023-11-23 21:22:00,759 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:22:00,760 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=606, Unknown=0, NotChecked=0, Total=702 [2023-11-23 21:22:00,761 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 26 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:00,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 54 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:22:00,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:22:00,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2023-11-23 21:22:00,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:00,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-23 21:22:00,768 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2023-11-23 21:22:00,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:00,768 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-23 21:22:00,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:00,770 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-23 21:22:00,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:22:00,771 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:00,771 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:00,798 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:00,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:22:00,992 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:00,993 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:00,993 INFO L85 PathProgramCache]: Analyzing trace with hash -1943895471, now seen corresponding path program 3 times [2023-11-23 21:22:00,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:00,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86011924] [2023-11-23 21:22:00,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:00,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:01,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:01,831 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:22:01,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:01,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86011924] [2023-11-23 21:22:01,832 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86011924] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:01,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499750942] [2023-11-23 21:22:01,832 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:22:01,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:01,832 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:01,834 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:01,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:22:01,914 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:22:01,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:01,916 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-23 21:22:01,920 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:02,021 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2023-11-23 21:22:02,102 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:02,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 18 [2023-11-23 21:22:02,129 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:02,130 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 10 [2023-11-23 21:22:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:02,147 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:08,609 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 73 treesize of output 67 [2023-11-23 21:22:08,645 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:08,646 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 295 treesize of output 281 [2023-11-23 21:22:09,108 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:09,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499750942] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:09,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1084497014] [2023-11-23 21:22:09,111 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:22:09,111 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:09,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:09,112 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:09,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:09,647 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:12,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1083#(and (= |ULTIMATE.start_main_~k~0#1| 1) (= |ULTIMATE.start_main_~#v~0#1.offset| 0) (<= 1 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |ULTIMATE.start_main_~j~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (<= 2 (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 4) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:22:12,662 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:12,662 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:12,662 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 11] total 25 [2023-11-23 21:22:12,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161648565] [2023-11-23 21:22:12,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:12,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 21:22:12,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:12,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 21:22:12,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=973, Unknown=4, NotChecked=0, Total=1122 [2023-11-23 21:22:12,666 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:14,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:22:14,725 INFO L93 Difference]: Finished difference Result 71 states and 87 transitions. [2023-11-23 21:22:14,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-23 21:22:14,725 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-23 21:22:14,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:22:14,727 INFO L225 Difference]: With dead ends: 71 [2023-11-23 21:22:14,727 INFO L226 Difference]: Without dead ends: 69 [2023-11-23 21:22:14,729 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=422, Invalid=2226, Unknown=4, NotChecked=0, Total=2652 [2023-11-23 21:22:14,730 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 252 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 396 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:22:14,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 92 Invalid, 396 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 363 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:22:14,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-23 21:22:14,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 32. [2023-11-23 21:22:14,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:14,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2023-11-23 21:22:14,744 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 18 [2023-11-23 21:22:14,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:22:14,744 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2023-11-23 21:22:14,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:14,745 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2023-11-23 21:22:14,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:22:14,746 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:22:14,746 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:22:14,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:22:14,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:22:14,947 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:22:14,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:22:14,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1260521504, now seen corresponding path program 2 times [2023-11-23 21:22:14,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:22:14,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739810193] [2023-11-23 21:22:14,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:22:14,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:22:14,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:22:16,072 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:22:16,072 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:22:16,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739810193] [2023-11-23 21:22:16,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739810193] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:22:16,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178686227] [2023-11-23 21:22:16,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:22:16,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:22:16,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:22:16,073 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:22:16,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a36c6175-5dda-462a-b34e-fc3037721640/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:22:16,163 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-23 21:22:16,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:22:16,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 21:22:16,168 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:22:16,297 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 25 treesize of output 20 [2023-11-23 21:22:16,427 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:16,428 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 40 treesize of output 20 [2023-11-23 21:22:16,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:16,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:22:16,581 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:16,581 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 20 [2023-11-23 21:22:16,634 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:16,634 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 12 [2023-11-23 21:22:16,670 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:16,670 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:22:25,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 81 [2023-11-23 21:22:25,210 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:22:25,211 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 2317 treesize of output 2063 [2023-11-23 21:22:27,531 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 9 refuted. 1 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:22:27,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178686227] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:22:27,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [877716544] [2023-11-23 21:22:27,538 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-23 21:22:27,538 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:22:27,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:22:27,539 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:22:27,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:22:28,031 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:22:29,418 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1414#(and (= |ULTIMATE.start_main_~k~0#1| 1) (= |ULTIMATE.start_main_~#v~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296) (mod |ULTIMATE.start_main_~j~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (exists ((|v_ULTIMATE.start_main_#t~mem9#1_92| Int) (|v_ULTIMATE.start_main_#t~mem9#1_91| Int) (|v_ULTIMATE.start_main_#t~short10#1_16| Bool) (|v_#memory_int_91| (Array Int (Array Int Int)))) (and (or (and (= |v_ULTIMATE.start_main_#t~mem9#1_92| |v_ULTIMATE.start_main_#t~mem9#1_91|) (not |v_ULTIMATE.start_main_#t~short10#1_16|)) (and |v_ULTIMATE.start_main_#t~short10#1_16| (= (select (select |v_#memory_int_91| |ULTIMATE.start_main_~#v~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) |v_ULTIMATE.start_main_#t~mem9#1_92|) (<= |v_ULTIMATE.start_main_#t~mem9#1_92| |ULTIMATE.start_main_~key~0#1|))) (= (store |v_#memory_int_91| |ULTIMATE.start_main_~#v~0#1.base| (store (select |v_#memory_int_91| |ULTIMATE.start_main_~#v~0#1.base|) (+ (* |ULTIMATE.start_main_~i~0#1| 4) 4) |ULTIMATE.start_main_~key~0#1|)) |#memory_int|) (or (and (<= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (not |v_ULTIMATE.start_main_#t~short10#1_16|)) (and |v_ULTIMATE.start_main_#t~short10#1_16| (<= 0 |ULTIMATE.start_main_~i~0#1|))))) (<= 2 (mod |ULTIMATE.start_main_~SIZE~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#v~0#1.base|) 4) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem14#1| 1) |ULTIMATE.start_main_#t~mem13#1|))' at error location [2023-11-23 21:22:29,419 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:22:29,419 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:22:29,419 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 11] total 26 [2023-11-23 21:22:29,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669042034] [2023-11-23 21:22:29,419 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:22:29,420 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-23 21:22:29,420 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:22:29,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-23 21:22:29,422 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=968, Unknown=15, NotChecked=0, Total=1122 [2023-11-23 21:22:29,422 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 26 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 26 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:22:42,314 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1]