./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.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_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/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_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/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_75eb3cbb-dd5b-4511-983d-23285d8f7153/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 1ae3736aabcb020d122100864e41791456e1f94490735ab1a93eef5c54883fe7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:08:03,959 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:08:04,029 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:08:04,035 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:08:04,036 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:08:04,061 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:08:04,062 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:08:04,062 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:08:04,063 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:08:04,064 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:08:04,065 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:08:04,065 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:08:04,066 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:08:04,067 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:08:04,067 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:08:04,068 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:08:04,068 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:08:04,069 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:08:04,070 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:08:04,070 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:08:04,071 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:08:04,071 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:08:04,072 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:08:04,073 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:08:04,073 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:08:04,074 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:08:04,074 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:08:04,075 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:08:04,075 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:08:04,076 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:08:04,076 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:08:04,077 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:08:04,077 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:08:04,077 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:08:04,078 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:08:04,078 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:08:04,078 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:08:04,079 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:08:04,079 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:08:04,079 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:08:04,080 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:08:04,080 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:08:04,081 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:08:04,081 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:08:04,081 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:08:04,081 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:08:04,082 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:08:04,082 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_75eb3cbb-dd5b-4511-983d-23285d8f7153/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1ae3736aabcb020d122100864e41791456e1f94490735ab1a93eef5c54883fe7 [2023-11-23 21:08:04,383 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:08:04,414 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:08:04,416 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:08:04,419 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:08:04,419 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:08:04,420 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c [2023-11-23 21:08:07,562 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:08:07,768 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:08:07,772 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c [2023-11-23 21:08:07,786 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/data/b35a6440a/976e9c2dc6464d03bbe698c40023c22c/FLAG84ba0647d [2023-11-23 21:08:07,802 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/data/b35a6440a/976e9c2dc6464d03bbe698c40023c22c [2023-11-23 21:08:07,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:08:07,806 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:08:07,807 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:08:07,808 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:08:07,814 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:08:07,814 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:07" (1/1) ... [2023-11-23 21:08:07,816 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35b6e6dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:07, skipping insertion in model container [2023-11-23 21:08:07,816 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:07" (1/1) ... [2023-11-23 21:08:07,845 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:08:08,072 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_75eb3cbb-dd5b-4511-983d-23285d8f7153/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c[1613,1626] [2023-11-23 21:08:08,092 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:08:08,115 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:08:08,161 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_75eb3cbb-dd5b-4511-983d-23285d8f7153/sv-benchmarks/c/loop-lit/gj2007.c.i.p+lhb-reducer.c[1613,1626] [2023-11-23 21:08:08,179 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:08:08,199 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:08:08,199 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08 WrapperNode [2023-11-23 21:08:08,200 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:08:08,201 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:08:08,201 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:08:08,202 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:08:08,211 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,221 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,255 INFO L138 Inliner]: procedures = 14, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 115 [2023-11-23 21:08:08,256 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:08:08,257 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:08:08,257 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:08:08,257 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:08:08,269 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,269 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,281 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,281 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,292 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,295 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,296 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,297 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,307 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:08:08,308 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:08:08,308 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:08:08,309 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:08:08,310 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (1/1) ... [2023-11-23 21:08:08,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:08:08,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:08,352 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:08:08,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:08:08,406 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:08:08,406 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:08:08,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:08:08,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:08:08,474 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:08:08,477 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:08:08,773 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:08:08,865 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:08:08,865 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-23 21:08:08,867 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:08 BoogieIcfgContainer [2023-11-23 21:08:08,867 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:08:08,870 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:08:08,870 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:08:08,875 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:08:08,875 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:08:07" (1/3) ... [2023-11-23 21:08:08,876 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d8fdd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:08, skipping insertion in model container [2023-11-23 21:08:08,876 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:08" (2/3) ... [2023-11-23 21:08:08,877 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79d8fdd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:08, skipping insertion in model container [2023-11-23 21:08:08,877 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:08" (3/3) ... [2023-11-23 21:08:08,879 INFO L112 eAbstractionObserver]: Analyzing ICFG gj2007.c.i.p+lhb-reducer.c [2023-11-23 21:08:08,901 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:08:08,901 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:08:08,961 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:08:08,969 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;@30163011, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:08:08,969 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:08:08,974 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 15 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 21:08:08,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:08:08,982 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:08,983 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:08,984 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:08:08,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:08,991 INFO L85 PathProgramCache]: Analyzing trace with hash -548503690, now seen corresponding path program 1 times [2023-11-23 21:08:09,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:09,005 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969918828] [2023-11-23 21:08:09,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:09,006 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:09,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:10,202 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 21:08:10,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:10,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969918828] [2023-11-23 21:08:10,204 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969918828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:10,204 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:10,205 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2023-11-23 21:08:10,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728868802] [2023-11-23 21:08:10,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:10,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-23 21:08:10,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:10,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-23 21:08:10,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:08:10,248 INFO L87 Difference]: Start difference. First operand has 16 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 15 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) Second operand has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:10,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:10,348 INFO L93 Difference]: Finished difference Result 22 states and 33 transitions. [2023-11-23 21:08:10,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 21:08:10,350 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-23 21:08:10,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:10,359 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:08:10,359 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 21:08:10,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:08:10,369 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:10,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:10,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 21:08:10,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-23 21:08:10,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:10,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-11-23 21:08:10,399 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2023-11-23 21:08:10,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:10,400 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-11-23 21:08:10,401 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:10,401 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-11-23 21:08:10,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:08:10,402 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:10,402 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:10,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:08:10,403 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:08:10,404 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:10,404 INFO L85 PathProgramCache]: Analyzing trace with hash 177920256, now seen corresponding path program 1 times [2023-11-23 21:08:10,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:10,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962119116] [2023-11-23 21:08:10,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:10,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:10,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:10,848 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:10,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:10,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962119116] [2023-11-23 21:08:10,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962119116] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:10,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1231553868] [2023-11-23 21:08:10,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:10,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:10,852 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:10,854 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:10,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:08:10,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:10,934 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:08:10,942 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:11,042 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:11,043 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:08:11,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:11,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1231553868] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:08:11,759 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034224939] [2023-11-23 21:08:11,779 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:08:11,779 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:08:11,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:08:11,789 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:08:11,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:08:12,102 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:08:12,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171#(and (= ~__return_720~0 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= 100 |ULTIMATE.start_main_~main__x~0#1|) (not (= |ULTIMATE.start_main_~main__y~0#1| 100)) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (= ~__return_main~0 0))' at error location [2023-11-23 21:08:12,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:08:12,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:08:12,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-23 21:08:12,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532453465] [2023-11-23 21:08:12,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:08:12,797 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 21:08:12,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:12,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 21:08:12,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=499, Invalid=833, Unknown=0, NotChecked=0, Total=1332 [2023-11-23 21:08:12,799 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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 21:08:12,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:12,885 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-23 21:08:12,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:08:12,885 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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 14 [2023-11-23 21:08:12,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:12,886 INFO L225 Difference]: With dead ends: 30 [2023-11-23 21:08:12,887 INFO L226 Difference]: Without dead ends: 27 [2023-11-23 21:08:12,888 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=499, Invalid=833, Unknown=0, NotChecked=0, Total=1332 [2023-11-23 21:08:12,889 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:12,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:12,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-23 21:08:12,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-23 21:08:12,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 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 21:08:12,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2023-11-23 21:08:12,896 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2023-11-23 21:08:12,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:12,896 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2023-11-23 21:08:12,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 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 21:08:12,897 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2023-11-23 21:08:12,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:08:12,898 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:12,898 INFO L195 NwaCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:12,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:08:13,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-23 21:08:13,120 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:08:13,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:13,122 INFO L85 PathProgramCache]: Analyzing trace with hash -941338240, now seen corresponding path program 2 times [2023-11-23 21:08:13,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:13,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538589256] [2023-11-23 21:08:13,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:13,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:13,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:14,440 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:14,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:14,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538589256] [2023-11-23 21:08:14,441 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538589256] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:14,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754278551] [2023-11-23 21:08:14,441 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:08:14,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:14,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:14,445 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:14,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:08:14,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2023-11-23 21:08:14,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:08:14,522 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-23 21:08:14,526 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:14,627 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:14,628 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:08:15,980 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:15,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754278551] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:08:15,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1911024546] [2023-11-23 21:08:15,983 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:08:15,984 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:08:15,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:08:15,984 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:08:15,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:08:16,151 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:08:16,764 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '439#(and (= ~__return_720~0 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= 100 |ULTIMATE.start_main_~main__x~0#1|) (not (= |ULTIMATE.start_main_~main__y~0#1| 100)) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (= ~__return_main~0 0))' at error location [2023-11-23 21:08:16,764 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:08:16,765 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:08:16,765 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-23 21:08:16,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595735843] [2023-11-23 21:08:16,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:08:16,766 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-23 21:08:16,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:16,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-23 21:08:16,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1591, Invalid=2069, Unknown=0, NotChecked=0, Total=3660 [2023-11-23 21:08:16,771 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:16,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:16,896 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2023-11-23 21:08:16,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-23 21:08:16,899 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-11-23 21:08:16,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:16,904 INFO L225 Difference]: With dead ends: 54 [2023-11-23 21:08:16,904 INFO L226 Difference]: Without dead ends: 51 [2023-11-23 21:08:16,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1141 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1591, Invalid=2069, Unknown=0, NotChecked=0, Total=3660 [2023-11-23 21:08:16,910 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:16,914 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:16,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-23 21:08:16,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-23 21:08:16,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:16,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2023-11-23 21:08:16,928 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2023-11-23 21:08:16,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:16,929 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2023-11-23 21:08:16,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:16,930 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2023-11-23 21:08:16,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 21:08:16,932 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:16,932 INFO L195 NwaCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:16,961 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:08:17,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:17,153 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:08:17,154 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:17,154 INFO L85 PathProgramCache]: Analyzing trace with hash -87752064, now seen corresponding path program 3 times [2023-11-23 21:08:17,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:17,154 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984779546] [2023-11-23 21:08:17,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:17,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:17,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:20,872 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:20,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:20,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984779546] [2023-11-23 21:08:20,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984779546] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:20,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1191257729] [2023-11-23 21:08:20,873 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:08:20,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:20,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:20,876 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:20,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:08:20,989 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:08:20,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:08:20,992 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-23 21:08:21,002 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:21,144 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:21,144 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:08:25,203 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:25,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1191257729] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:08:25,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1243255953] [2023-11-23 21:08:25,210 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:08:25,210 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:08:25,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:08:25,211 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:08:25,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:08:25,375 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:08:26,049 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '947#(and (= ~__return_720~0 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~__VERIFIER_assert__cond~0#1| 0) (<= 100 |ULTIMATE.start_main_~main__x~0#1|) (not (= |ULTIMATE.start_main_~main__y~0#1| 100)) (= |ULTIMATE.start_main_~__tmp_1~0#1| 0) (= ~__return_main~0 0))' at error location [2023-11-23 21:08:26,050 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:08:26,050 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:08:26,050 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2023-11-23 21:08:26,050 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915342576] [2023-11-23 21:08:26,050 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:08:26,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-11-23 21:08:26,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:26,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-11-23 21:08:26,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5503, Invalid=6269, Unknown=0, NotChecked=0, Total=11772 [2023-11-23 21:08:26,063 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:26,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:26,386 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2023-11-23 21:08:26,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-11-23 21:08:26,388 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-11-23 21:08:26,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:26,392 INFO L225 Difference]: With dead ends: 102 [2023-11-23 21:08:26,393 INFO L226 Difference]: Without dead ends: 99 [2023-11-23 21:08:26,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2317 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=5503, Invalid=6269, Unknown=0, NotChecked=0, Total=11772 [2023-11-23 21:08:26,405 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:26,407 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:26,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-23 21:08:26,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-23 21:08:26,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:26,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2023-11-23 21:08:26,435 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2023-11-23 21:08:26,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:26,435 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2023-11-23 21:08:26,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:26,436 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2023-11-23 21:08:26,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-23 21:08:26,442 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:26,445 INFO L195 NwaCegarLoop]: trace histogram [85, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:26,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:08:26,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:26,661 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:08:26,661 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:26,661 INFO L85 PathProgramCache]: Analyzing trace with hash 155018368, now seen corresponding path program 4 times [2023-11-23 21:08:26,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:26,662 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498962536] [2023-11-23 21:08:26,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:26,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:26,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:39,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:39,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:39,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498962536] [2023-11-23 21:08:39,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498962536] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:39,963 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087569856] [2023-11-23 21:08:39,963 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:08:39,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:39,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:39,973 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:39,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_75eb3cbb-dd5b-4511-983d-23285d8f7153/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:08:40,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:40,112 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 97 conjunts are in the unsatisfiable core [2023-11-23 21:08:40,124 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 0 proven. 3655 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:40,477 INFO L327 TraceCheckSpWp]: Computing backward predicates...