./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/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 603eeec29f0f7a499f451ec7fa1906f0a8c90a729e0fc96740e12a91ea711946 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:32:14,251 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:32:14,364 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:32:14,371 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:32:14,372 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:32:14,426 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:32:14,427 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:32:14,427 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:32:14,428 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:32:14,429 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:32:14,429 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:32:14,430 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:32:14,430 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:32:14,431 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:32:14,431 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:32:14,432 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:32:14,435 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:32:14,439 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:32:14,439 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:32:14,440 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:32:14,442 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:32:14,442 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:32:14,443 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:32:14,444 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:32:14,444 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:32:14,444 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:32:14,445 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:32:14,445 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:32:14,446 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:32:14,446 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:32:14,447 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:32:14,448 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:32:14,448 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:32:14,448 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:32:14,449 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:32:14,449 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:32:14,449 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:32:14,449 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:32:14,449 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:32:14,450 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:32:14,450 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:32:14,450 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:32:14,450 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:32:14,451 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:32:14,451 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:32:14,451 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:32:14,452 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:32:14,452 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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 603eeec29f0f7a499f451ec7fa1906f0a8c90a729e0fc96740e12a91ea711946 [2023-11-23 21:32:14,741 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:32:14,762 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:32:14,765 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:32:14,766 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:32:14,767 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:32:14,768 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.c [2023-11-23 21:32:17,996 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:32:18,194 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:32:18,195 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.c [2023-11-23 21:32:18,204 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/data/96b6adc23/e4748f711c564b0087c6f376f7cc1ce4/FLAG0b5465dcd [2023-11-23 21:32:18,219 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/data/96b6adc23/e4748f711c564b0087c6f376f7cc1ce4 [2023-11-23 21:32:18,221 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:32:18,223 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:32:18,224 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:32:18,225 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:32:18,232 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:32:18,233 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,234 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53a07c6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18, skipping insertion in model container [2023-11-23 21:32:18,235 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,261 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:32:18,450 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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.c[537,550] [2023-11-23 21:32:18,477 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:32:18,489 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:32:18,505 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_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/sv-benchmarks/c/nla-digbench-scaling/hard-u_unwindbound2.c[537,550] [2023-11-23 21:32:18,527 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:32:18,543 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:32:18,544 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18 WrapperNode [2023-11-23 21:32:18,544 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:32:18,545 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:32:18,546 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:32:18,546 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:32:18,554 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,562 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,588 INFO L138 Inliner]: procedures = 14, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 66 [2023-11-23 21:32:18,588 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:32:18,589 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:32:18,589 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:32:18,589 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:32:18,599 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,600 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,611 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,612 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,616 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,626 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,627 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,629 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,635 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:32:18,638 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:32:18,639 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:32:18,639 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:32:18,640 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (1/1) ... [2023-11-23 21:32:18,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:32:18,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:18,682 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:32:18,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:32:18,728 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:32:18,728 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:32:18,728 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:32:18,729 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:32:18,730 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 21:32:18,730 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 21:32:18,795 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:32:18,797 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:32:18,979 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:32:19,043 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:32:19,043 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:32:19,045 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:32:19 BoogieIcfgContainer [2023-11-23 21:32:19,045 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:32:19,048 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:32:19,048 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:32:19,052 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:32:19,052 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:32:18" (1/3) ... [2023-11-23 21:32:19,053 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@351017b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:32:19, skipping insertion in model container [2023-11-23 21:32:19,053 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:32:18" (2/3) ... [2023-11-23 21:32:19,054 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@351017b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:32:19, skipping insertion in model container [2023-11-23 21:32:19,054 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:32:19" (3/3) ... [2023-11-23 21:32:19,055 INFO L112 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound2.c [2023-11-23 21:32:19,085 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:32:19,086 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:32:19,154 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:32:19,161 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;@17dc5d5a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:32:19,162 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:32:19,166 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-11-23 21:32:19,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:32:19,174 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:19,175 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:19,175 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:19,180 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:19,181 INFO L85 PathProgramCache]: Analyzing trace with hash 151460259, now seen corresponding path program 1 times [2023-11-23 21:32:19,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:19,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18910453] [2023-11-23 21:32:19,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:19,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:19,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:19,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:19,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18910453] [2023-11-23 21:32:19,345 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-23 21:32:19,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976584438] [2023-11-23 21:32:19,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:19,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:19,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:19,349 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:19,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:32:19,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:19,447 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 1 conjunts are in the unsatisfiable core [2023-11-23 21:32:19,451 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:19,475 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 21:32:19,475 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:32:19,476 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976584438] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:19,476 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:19,476 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:32:19,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557671591] [2023-11-23 21:32:19,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:19,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-23 21:32:19,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:19,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-23 21:32:19,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 21:32:19,519 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 13 states have internal predecessors, (20), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:19,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:19,577 INFO L93 Difference]: Finished difference Result 43 states and 74 transitions. [2023-11-23 21:32:19,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-23 21:32:19,580 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:32:19,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:19,587 INFO L225 Difference]: With dead ends: 43 [2023-11-23 21:32:19,588 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:32:19,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-23 21:32:19,595 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 3 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:19,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 3 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:19,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:32:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:32:19,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 7 states have call successors, (7), 1 states have call predecessors, (7), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:32:19,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 29 transitions. [2023-11-23 21:32:19,657 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 29 transitions. Word has length 7 [2023-11-23 21:32:19,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:19,658 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 29 transitions. [2023-11-23 21:32:19,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:19,659 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 29 transitions. [2023-11-23 21:32:19,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-23 21:32:19,660 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:19,660 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:19,676 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 21:32:19,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-23 21:32:19,866 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:19,867 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:19,867 INFO L85 PathProgramCache]: Analyzing trace with hash -310598151, now seen corresponding path program 1 times [2023-11-23 21:32:19,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:19,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140113073] [2023-11-23 21:32:19,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:19,869 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:19,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:20,177 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 21:32:20,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:20,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140113073] [2023-11-23 21:32:20,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140113073] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:20,178 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:20,179 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:32:20,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842998986] [2023-11-23 21:32:20,179 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:20,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:20,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:20,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:20,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:20,185 INFO L87 Difference]: Start difference. First operand 20 states and 29 transitions. Second operand has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:20,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:20,281 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2023-11-23 21:32:20,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:32:20,284 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-23 21:32:20,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:20,286 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:32:20,287 INFO L226 Difference]: Without dead ends: 31 [2023-11-23 21:32:20,288 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:32:20,289 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:20,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 81 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:20,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-23 21:32:20,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2023-11-23 21:32:20,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 15 states have internal predecessors, (19), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:32:20,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-11-23 21:32:20,310 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 7 [2023-11-23 21:32:20,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:20,311 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-11-23 21:32:20,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.2) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:20,311 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-11-23 21:32:20,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-23 21:32:20,312 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:20,312 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:20,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:32:20,313 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:20,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:20,313 INFO L85 PathProgramCache]: Analyzing trace with hash -751211152, now seen corresponding path program 1 times [2023-11-23 21:32:20,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:20,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973980795] [2023-11-23 21:32:20,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:20,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:20,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:20,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:20,343 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973980795] [2023-11-23 21:32:20,344 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unsupported non-linear arithmetic [2023-11-23 21:32:20,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [490682978] [2023-11-23 21:32:20,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:20,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:20,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:20,346 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:20,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:32:20,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:20,411 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:32:20,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:20,449 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 21:32:20,450 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:32:20,450 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [490682978] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:20,450 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:20,450 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:32:20,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710297820] [2023-11-23 21:32:20,451 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:20,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:32:20,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:20,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:32:20,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-23 21:32:20,453 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:20,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:20,477 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2023-11-23 21:32:20,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:32:20,478 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-23 21:32:20,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:20,479 INFO L225 Difference]: With dead ends: 39 [2023-11-23 21:32:20,479 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:32:20,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 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 21:32:20,482 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:20,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:20,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:32:20,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:32:20,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.3125) internal successors, (21), 17 states have internal predecessors, (21), 7 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:32:20,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2023-11-23 21:32:20,491 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 9 [2023-11-23 21:32:20,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:20,491 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2023-11-23 21:32:20,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:32:20,492 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2023-11-23 21:32:20,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:32:20,493 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:20,493 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:20,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:20,709 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-23 21:32:20,709 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:20,710 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:20,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1841718534, now seen corresponding path program 1 times [2023-11-23 21:32:20,711 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:20,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545498878] [2023-11-23 21:32:20,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:20,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:20,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:21,053 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:21,054 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:21,054 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545498878] [2023-11-23 21:32:21,055 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545498878] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:21,055 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:21,055 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:32:21,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449158884] [2023-11-23 21:32:21,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:21,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:21,056 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:21,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:21,058 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:21,058 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:32:21,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:21,118 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2023-11-23 21:32:21,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:32:21,120 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-11-23 21:32:21,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:21,121 INFO L225 Difference]: With dead ends: 39 [2023-11-23 21:32:21,121 INFO L226 Difference]: Without dead ends: 37 [2023-11-23 21:32:21,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:32:21,126 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 11 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:21,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 81 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:21,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-23 21:32:21,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2023-11-23 21:32:21,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 7 states have call successors, (7), 3 states have call predecessors, (7), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-23 21:32:21,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2023-11-23 21:32:21,150 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 12 [2023-11-23 21:32:21,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:21,151 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2023-11-23 21:32:21,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:32:21,153 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2023-11-23 21:32:21,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:32:21,154 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:21,155 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:21,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:32:21,156 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:21,156 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:21,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1224204839, now seen corresponding path program 1 times [2023-11-23 21:32:21,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:21,157 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126807129] [2023-11-23 21:32:21,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:21,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:21,188 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:21,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1107791872] [2023-11-23 21:32:21,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:21,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:21,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:21,190 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:21,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:32:21,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:21,270 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:32:21,272 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:21,454 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:32:21,455 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:32:21,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:21,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126807129] [2023-11-23 21:32:21,456 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:21,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107791872] [2023-11-23 21:32:21,456 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107791872] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:21,456 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:21,456 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:32:21,457 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570427228] [2023-11-23 21:32:21,457 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:21,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:21,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:21,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:21,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:21,461 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:32:21,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:21,581 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2023-11-23 21:32:21,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:32:21,582 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-23 21:32:21,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:21,586 INFO L225 Difference]: With dead ends: 58 [2023-11-23 21:32:21,587 INFO L226 Difference]: Without dead ends: 44 [2023-11-23 21:32:21,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:32:21,590 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 10 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:21,594 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 81 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:21,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-23 21:32:21,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2023-11-23 21:32:21,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 28 states have internal predecessors, (33), 13 states have call successors, (13), 4 states have call predecessors, (13), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-23 21:32:21,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 57 transitions. [2023-11-23 21:32:21,624 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 57 transitions. Word has length 17 [2023-11-23 21:32:21,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:21,626 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 57 transitions. [2023-11-23 21:32:21,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:32:21,631 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 57 transitions. [2023-11-23 21:32:21,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:32:21,634 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:21,634 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:21,659 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:21,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:21,855 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:21,856 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:21,856 INFO L85 PathProgramCache]: Analyzing trace with hash 1437524276, now seen corresponding path program 1 times [2023-11-23 21:32:21,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:21,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155096739] [2023-11-23 21:32:21,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:21,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:21,867 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:21,868 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1627599348] [2023-11-23 21:32:21,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:21,868 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:21,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:21,871 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:21,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:32:21,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:21,938 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:32:21,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:22,014 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:32:22,014 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:32:22,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:22,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155096739] [2023-11-23 21:32:22,018 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:22,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627599348] [2023-11-23 21:32:22,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627599348] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:22,018 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:32:22,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 21:32:22,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449124430] [2023-11-23 21:32:22,019 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:22,020 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:22,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:22,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:22,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:22,022 INFO L87 Difference]: Start difference. First operand 44 states and 57 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:32:22,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:22,075 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2023-11-23 21:32:22,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:32:22,076 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2023-11-23 21:32:22,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:22,081 INFO L225 Difference]: With dead ends: 64 [2023-11-23 21:32:22,081 INFO L226 Difference]: Without dead ends: 57 [2023-11-23 21:32:22,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:32:22,082 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:22,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 77 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:22,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2023-11-23 21:32:22,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2023-11-23 21:32:22,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 37 states have internal predecessors, (41), 13 states have call successors, (13), 7 states have call predecessors, (13), 7 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-23 21:32:22,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 65 transitions. [2023-11-23 21:32:22,108 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 65 transitions. Word has length 25 [2023-11-23 21:32:22,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:22,109 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 65 transitions. [2023-11-23 21:32:22,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:32:22,110 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 65 transitions. [2023-11-23 21:32:22,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:32:22,111 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:22,111 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:22,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:22,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:22,334 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:22,335 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:22,335 INFO L85 PathProgramCache]: Analyzing trace with hash 1439252154, now seen corresponding path program 1 times [2023-11-23 21:32:22,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:22,335 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589016790] [2023-11-23 21:32:22,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:22,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:22,348 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:22,348 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [397282092] [2023-11-23 21:32:22,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:22,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:22,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:22,350 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:22,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:32:22,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:22,424 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-23 21:32:22,428 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:22,682 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:32:22,682 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:22,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:22,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589016790] [2023-11-23 21:32:22,896 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:22,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397282092] [2023-11-23 21:32:22,896 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397282092] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:22,896 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1148205456] [2023-11-23 21:32:22,917 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:32:22,917 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:22,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:22,927 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:22,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:23,610 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 48 for LOIs [2023-11-23 21:32:23,702 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:24,947 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1148205456] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:24,947 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:32:24,947 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9] total 17 [2023-11-23 21:32:24,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691100675] [2023-11-23 21:32:24,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:24,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:32:24,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:24,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:32:24,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:32:24,950 INFO L87 Difference]: Start difference. First operand 56 states and 65 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:32:25,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:25,189 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2023-11-23 21:32:25,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:32:25,190 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 25 [2023-11-23 21:32:25,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:25,191 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:32:25,191 INFO L226 Difference]: Without dead ends: 46 [2023-11-23 21:32:25,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2023-11-23 21:32:25,192 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:25,192 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 66 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:32:25,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-23 21:32:25,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-23 21:32:25,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 21:32:25,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2023-11-23 21:32:25,203 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 25 [2023-11-23 21:32:25,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:25,203 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2023-11-23 21:32:25,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:32:25,203 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2023-11-23 21:32:25,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:32:25,204 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:25,205 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:25,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:25,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:25,420 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:25,420 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:25,420 INFO L85 PathProgramCache]: Analyzing trace with hash 964329913, now seen corresponding path program 1 times [2023-11-23 21:32:25,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:25,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208613566] [2023-11-23 21:32:25,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:25,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:25,434 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:25,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1000801926] [2023-11-23 21:32:25,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:25,434 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:25,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:25,436 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:25,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:32:25,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:25,500 INFO L262 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:32:25,503 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:25,544 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:32:25,544 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:25,580 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:32:25,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:25,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208613566] [2023-11-23 21:32:25,581 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:25,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000801926] [2023-11-23 21:32:25,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000801926] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:25,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1615068935] [2023-11-23 21:32:25,590 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:32:25,590 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:25,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:25,591 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:25,591 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:27,416 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 80 for LOIs [2023-11-23 21:32:27,893 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:28,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1342#(and (<= 1 |#StackHeapBarrier|) (<= ~counter~0 4) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:32:28,950 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:28,950 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:32:28,951 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 5 [2023-11-23 21:32:28,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519298381] [2023-11-23 21:32:28,951 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:28,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:28,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:28,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:28,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2023-11-23 21:32:28,953 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:32:29,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:29,008 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2023-11-23 21:32:29,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:32:29,009 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 27 [2023-11-23 21:32:29,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:29,010 INFO L225 Difference]: With dead ends: 61 [2023-11-23 21:32:29,010 INFO L226 Difference]: Without dead ends: 48 [2023-11-23 21:32:29,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:32:29,011 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:29,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 91 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:29,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-11-23 21:32:29,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2023-11-23 21:32:29,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 10 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-23 21:32:29,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 55 transitions. [2023-11-23 21:32:29,022 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 55 transitions. Word has length 27 [2023-11-23 21:32:29,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:29,022 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 55 transitions. [2023-11-23 21:32:29,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-23 21:32:29,023 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 55 transitions. [2023-11-23 21:32:29,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-23 21:32:29,024 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:29,024 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-23 21:32:29,050 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:29,240 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:32:29,241 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:29,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:29,241 INFO L85 PathProgramCache]: Analyzing trace with hash -327624414, now seen corresponding path program 1 times [2023-11-23 21:32:29,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:29,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624708449] [2023-11-23 21:32:29,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:29,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:29,253 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:29,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1046593468] [2023-11-23 21:32:29,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:29,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:29,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:29,254 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:29,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:32:29,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:29,406 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-23 21:32:29,408 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:29,521 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 21:32:29,521 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:29,705 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 20 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-23 21:32:29,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:29,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624708449] [2023-11-23 21:32:29,706 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:29,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046593468] [2023-11-23 21:32:29,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046593468] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:29,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [341745923] [2023-11-23 21:32:29,709 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:32:29,709 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:29,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:29,711 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:29,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:31,090 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 79 for LOIs [2023-11-23 21:32:31,425 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:32,500 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1725#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (<= ~counter~0 2))' at error location [2023-11-23 21:32:32,501 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:32,501 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:32:32,501 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2023-11-23 21:32:32,501 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476339799] [2023-11-23 21:32:32,501 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:32,502 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:32:32,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:32,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:32:32,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2023-11-23 21:32:32,503 INFO L87 Difference]: Start difference. First operand 48 states and 55 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:32:32,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:32,904 INFO L93 Difference]: Finished difference Result 83 states and 107 transitions. [2023-11-23 21:32:32,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:32:32,905 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 35 [2023-11-23 21:32:32,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:32,907 INFO L225 Difference]: With dead ends: 83 [2023-11-23 21:32:32,907 INFO L226 Difference]: Without dead ends: 75 [2023-11-23 21:32:32,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:32:32,909 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 23 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:32,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 142 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:32:32,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-23 21:32:32,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 65. [2023-11-23 21:32:32,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 40 states have (on average 1.2) internal successors, (48), 42 states have internal predecessors, (48), 17 states have call successors, (17), 7 states have call predecessors, (17), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2023-11-23 21:32:32,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2023-11-23 21:32:32,924 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 35 [2023-11-23 21:32:32,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:32,924 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2023-11-23 21:32:32,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 9 states have internal predecessors, (23), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:32:32,925 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2023-11-23 21:32:32,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 21:32:32,926 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:32,927 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:32,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:33,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-23 21:32:33,133 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:33,133 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:33,134 INFO L85 PathProgramCache]: Analyzing trace with hash 1605911421, now seen corresponding path program 1 times [2023-11-23 21:32:33,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:33,134 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168966838] [2023-11-23 21:32:33,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:33,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:33,145 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:33,145 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [582299365] [2023-11-23 21:32:33,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:33,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:33,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:33,146 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:33,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:32:33,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:33,228 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 21:32:33,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:33,472 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 16 proven. 26 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-23 21:32:33,473 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:33,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:33,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168966838] [2023-11-23 21:32:33,569 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-23 21:32:33,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582299365] [2023-11-23 21:32:33,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582299365] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:33,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157263082] [2023-11-23 21:32:33,573 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:32:33,573 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:33,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:33,573 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:33,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:34,933 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-23 21:32:34,941 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:36,150 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2118#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-23 21:32:36,150 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:36,150 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:32:36,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-11-23 21:32:36,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304244241] [2023-11-23 21:32:36,151 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:36,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:32:36,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:36,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:32:36,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:32:36,153 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-23 21:32:38,367 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2023-11-23 21:32:38,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:38,463 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2023-11-23 21:32:38,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:32:38,464 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 43 [2023-11-23 21:32:38,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:38,466 INFO L225 Difference]: With dead ends: 81 [2023-11-23 21:32:38,466 INFO L226 Difference]: Without dead ends: 79 [2023-11-23 21:32:38,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=99, Invalid=551, Unknown=0, NotChecked=0, Total=650 [2023-11-23 21:32:38,467 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 24 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 19 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:38,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 150 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 155 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2023-11-23 21:32:38,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-23 21:32:38,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 71. [2023-11-23 21:32:38,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 44 states have (on average 1.2045454545454546) internal successors, (53), 46 states have internal predecessors, (53), 18 states have call successors, (18), 8 states have call predecessors, (18), 8 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2023-11-23 21:32:38,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2023-11-23 21:32:38,482 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 43 [2023-11-23 21:32:38,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:38,483 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2023-11-23 21:32:38,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-23 21:32:38,483 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2023-11-23 21:32:38,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2023-11-23 21:32:38,484 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:38,485 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:38,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:38,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:32:38,700 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:38,701 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:38,701 INFO L85 PathProgramCache]: Analyzing trace with hash -216657726, now seen corresponding path program 1 times [2023-11-23 21:32:38,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:38,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879752539] [2023-11-23 21:32:38,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:38,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:38,709 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-23 21:32:38,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [314345725] [2023-11-23 21:32:38,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:38,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:38,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:38,712 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:38,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-23 21:32:38,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-23 21:32:38,773 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-23 21:32:38,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-23 21:32:38,819 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-11-23 21:32:38,820 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-23 21:32:38,821 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-23 21:32:38,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:39,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-23 21:32:39,036 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:39,041 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-23 21:32:39,071 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated [2023-11-23 21:32:39,075 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated [2023-11-23 21:32:39,079 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post7 could not be translated [2023-11-23 21:32:39,101 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 09:32:39 BoogieIcfgContainer [2023-11-23 21:32:39,101 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-23 21:32:39,102 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-23 21:32:39,102 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-23 21:32:39,102 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-23 21:32:39,102 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:32:19" (3/4) ... [2023-11-23 21:32:39,103 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2023-11-23 21:32:39,121 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated [2023-11-23 21:32:39,125 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated [2023-11-23 21:32:39,129 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~post7 could not be translated [2023-11-23 21:32:39,187 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/witness.graphml [2023-11-23 21:32:39,187 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-23 21:32:39,188 INFO L158 Benchmark]: Toolchain (without parser) took 20964.77ms. Allocated memory was 153.1MB in the beginning and 314.6MB in the end (delta: 161.5MB). Free memory was 112.7MB in the beginning and 124.6MB in the end (delta: -11.9MB). Peak memory consumption was 152.5MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,188 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 153.1MB. Free memory is still 125.3MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-23 21:32:39,188 INFO L158 Benchmark]: CACSL2BoogieTranslator took 320.02ms. Allocated memory is still 153.1MB. Free memory was 112.0MB in the beginning and 101.0MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,189 INFO L158 Benchmark]: Boogie Procedure Inliner took 43.13ms. Allocated memory is still 153.1MB. Free memory was 101.0MB in the beginning and 99.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,190 INFO L158 Benchmark]: Boogie Preprocessor took 48.30ms. Allocated memory is still 153.1MB. Free memory was 99.4MB in the beginning and 98.4MB in the end (delta: 980.0kB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-23 21:32:39,191 INFO L158 Benchmark]: RCFGBuilder took 407.17ms. Allocated memory is still 153.1MB. Free memory was 98.4MB in the beginning and 84.3MB in the end (delta: 14.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,191 INFO L158 Benchmark]: TraceAbstraction took 20053.11ms. Allocated memory was 153.1MB in the beginning and 314.6MB in the end (delta: 161.5MB). Free memory was 83.8MB in the beginning and 127.7MB in the end (delta: -44.0MB). Peak memory consumption was 121.0MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,192 INFO L158 Benchmark]: Witness Printer took 85.38ms. Allocated memory is still 314.6MB. Free memory was 126.7MB in the beginning and 124.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-23 21:32:39,193 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 153.1MB. Free memory is still 125.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 320.02ms. Allocated memory is still 153.1MB. Free memory was 112.0MB in the beginning and 101.0MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 43.13ms. Allocated memory is still 153.1MB. Free memory was 101.0MB in the beginning and 99.4MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 48.30ms. Allocated memory is still 153.1MB. Free memory was 99.4MB in the beginning and 98.4MB in the end (delta: 980.0kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 407.17ms. Allocated memory is still 153.1MB. Free memory was 98.4MB in the beginning and 84.3MB in the end (delta: 14.2MB). Peak memory consumption was 14.7MB. Max. memory is 16.1GB. * TraceAbstraction took 20053.11ms. Allocated memory was 153.1MB in the beginning and 314.6MB in the end (delta: 161.5MB). Free memory was 83.8MB in the beginning and 127.7MB in the end (delta: -44.0MB). Peak memory consumption was 121.0MB. Max. memory is 16.1GB. * Witness Printer took 85.38ms. Allocated memory is still 314.6MB. Free memory was 126.7MB in the beginning and 124.6MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post7 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post6 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~post7 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L22] int counter = 0; [L24] unsigned int A, B; [L25] unsigned int r, d, p, q; [L26] A = __VERIFIER_nondet_uint() [L27] B = __VERIFIER_nondet_uint() [L28] CALL assume_abort_if_not(B >= 1) [L12] COND FALSE !(!cond) [L28] RET assume_abort_if_not(B >= 1) [L30] r = A [L31] d = B [L32] p = 1 [L33] q = 0 VAL [A=1, B=1, counter=0, d=1, p=1, q=0, r=1] [L35] EXPR counter++ VAL [A=1, B=1, counter=1, d=1, p=1, q=0, r=1] [L35] COND TRUE counter++<2 [L36] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L36] RET __VERIFIER_assert(q == 0) VAL [A=1, B=1, counter=1, d=1, p=1, q=0, r=1] [L37] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L37] RET __VERIFIER_assert(r == A) VAL [A=1, B=1, counter=1, d=1, p=1, q=0, r=1] [L38] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, counter=1] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=1] [L38] RET __VERIFIER_assert(d == B * p) VAL [A=1, B=1, counter=1, d=1, p=1, q=0, r=1] [L39] COND FALSE !(!(r >= d)) [L41] d = 2 * d [L42] p = 2 * p VAL [A=1, B=1, counter=1, d=2, p=2, q=0, r=1] [L35] EXPR counter++ VAL [A=1, B=1, counter=2, d=2, p=2, q=0, r=1] [L35] COND TRUE counter++<2 [L36] CALL __VERIFIER_assert(q == 0) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L36] RET __VERIFIER_assert(q == 0) VAL [A=1, B=1, counter=2, d=2, p=2, q=0, r=1] [L37] CALL __VERIFIER_assert(r == A) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L37] RET __VERIFIER_assert(r == A) VAL [A=1, B=1, counter=2, d=2, p=2, q=0, r=1] [L38] CALL __VERIFIER_assert(d == B * p) VAL [\old(cond)=1, counter=2] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=2] [L38] RET __VERIFIER_assert(d == B * p) VAL [A=1, B=1, counter=2, d=2, p=2, q=0, r=1] [L39] COND TRUE !(r >= d) VAL [A=1, B=1, counter=2, d=2, p=2, q=0, r=1] [L45] EXPR counter++ VAL [A=1, B=1, counter=3, d=2, p=2, q=0, r=1] [L45] COND FALSE !(counter++<2) [L59] CALL __VERIFIER_assert(A == d*q + r) VAL [\old(cond)=1, counter=3] [L15] COND FALSE !(!(cond)) VAL [\old(cond)=1, cond=1, counter=3] [L59] RET __VERIFIER_assert(A == d*q + r) VAL [A=1, B=1, counter=3, d=2, p=2, q=0, r=1] [L60] CALL __VERIFIER_assert(B == d) VAL [\old(cond)=0, counter=3] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0, counter=3] [L17] reach_error() VAL [\old(cond)=0, cond=0, counter=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 19.9s, OverallIterations: 11, TraceHistogramMax: 8, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 3.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1 mSolverCounterUnknown, 113 SdHoareTripleChecker+Valid, 3.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 83 mSDsluCounter, 870 SdHoareTripleChecker+Invalid, 2.9s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 638 mSDsCounter, 34 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 616 IncrementalHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 34 mSolverCounterUnsat, 232 mSDtfsCounter, 616 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 405 GetRequests, 291 SyntacticMatches, 21 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 5.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=71occurred in iteration=10, InterpolantAutomatonStates: 63, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 33 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 271 NumberOfCodeBlocks, 271 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 257 ConstructedInterpolants, 0 QuantifiedInterpolants, 950 SizeOfPredicates, 15 NumberOfNonLiveVariables, 621 ConjunctsInSsa, 77 ConjunctsInUnsatCore, 12 InterpolantComputations, 6 PerfectInterpolantSequences, 223/274 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.8s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 2, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 17, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 13, TOOLS_POST_TIME: 0.2s, TOOLS_POST_CALL_APPLICATIONS: 10, TOOLS_POST_CALL_TIME: 0.2s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.1s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 29, TOOLS_QUANTIFIERELIM_TIME: 0.5s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 41, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 13, DOMAIN_JOIN_TIME: 0.2s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 17, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 1, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 153, DAG_COMPRESSION_RETAINED_NODES: 45, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2023-11-23 21:32:39,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf7f34dc-2215-4b4c-92fa-b098d0a6eba3/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE