./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_07.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_07.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9dab8665a28c2bbd1b423d2ce2720a6327cfb393a457dca88feb0fe7cdfd90ee --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-29 01:07:07,331 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-29 01:07:07,395 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-29 01:07:07,399 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-29 01:07:07,399 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-29 01:07:07,422 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-29 01:07:07,423 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-29 01:07:07,423 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-29 01:07:07,424 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-29 01:07:07,424 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-29 01:07:07,425 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-29 01:07:07,425 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-29 01:07:07,426 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-29 01:07:07,427 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-29 01:07:07,427 INFO L153 SettingsManager]: * Use SBE=true [2023-11-29 01:07:07,428 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-29 01:07:07,429 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-29 01:07:07,429 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-29 01:07:07,430 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-29 01:07:07,430 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-29 01:07:07,431 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-29 01:07:07,431 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-29 01:07:07,432 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-29 01:07:07,432 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-29 01:07:07,432 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-29 01:07:07,433 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-29 01:07:07,433 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-29 01:07:07,434 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-29 01:07:07,434 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-29 01:07:07,434 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-29 01:07:07,435 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-29 01:07:07,435 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-29 01:07:07,435 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-29 01:07:07,435 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-29 01:07:07,436 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-29 01:07:07,436 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-29 01:07:07,436 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-29 01:07:07,436 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-29 01:07:07,436 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-29 01:07:07,437 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-29 01:07:07,437 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-29 01:07:07,437 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-29 01:07:07,437 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9dab8665a28c2bbd1b423d2ce2720a6327cfb393a457dca88feb0fe7cdfd90ee [2023-11-29 01:07:07,661 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-29 01:07:07,681 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-29 01:07:07,683 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-29 01:07:07,684 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-29 01:07:07,685 INFO L274 PluginConnector]: CDTParser initialized [2023-11-29 01:07:07,686 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/../../sv-benchmarks/c/array-examples/standard_two_index_07.i [2023-11-29 01:07:10,495 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-29 01:07:10,677 INFO L384 CDTParser]: Found 1 translation units. [2023-11-29 01:07:10,677 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/sv-benchmarks/c/array-examples/standard_two_index_07.i [2023-11-29 01:07:10,683 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/data/c7b341b06/0241d84166dd42808058572450a153f9/FLAG7a535e468 [2023-11-29 01:07:10,696 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/data/c7b341b06/0241d84166dd42808058572450a153f9 [2023-11-29 01:07:10,698 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-29 01:07:10,700 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-29 01:07:10,702 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-29 01:07:10,702 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-29 01:07:10,706 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-29 01:07:10,706 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,707 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@905234 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10, skipping insertion in model container [2023-11-29 01:07:10,708 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,736 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-29 01:07:10,874 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_a75827f0-3325-46cd-a700-d74fd42811d0/sv-benchmarks/c/array-examples/standard_two_index_07.i[814,827] [2023-11-29 01:07:10,888 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-29 01:07:10,898 INFO L202 MainTranslator]: Completed pre-run [2023-11-29 01:07:10,910 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_a75827f0-3325-46cd-a700-d74fd42811d0/sv-benchmarks/c/array-examples/standard_two_index_07.i[814,827] [2023-11-29 01:07:10,917 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-29 01:07:10,933 INFO L206 MainTranslator]: Completed translation [2023-11-29 01:07:10,933 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10 WrapperNode [2023-11-29 01:07:10,933 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-29 01:07:10,935 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-29 01:07:10,935 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-29 01:07:10,935 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-29 01:07:10,942 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,949 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,969 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2023-11-29 01:07:10,969 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-29 01:07:10,970 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-29 01:07:10,970 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-29 01:07:10,971 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-29 01:07:10,982 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,983 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,984 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,998 INFO L175 MemorySlicer]: Split 7 memory accesses to 3 slices as follows [2, 3, 2]. 43 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0]. The 2 writes are split as follows [0, 1, 1]. [2023-11-29 01:07:10,998 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:10,998 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,004 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,007 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,009 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,010 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,012 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-29 01:07:11,013 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-29 01:07:11,013 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-29 01:07:11,013 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-29 01:07:11,014 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (1/1) ... [2023-11-29 01:07:11,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-29 01:07:11,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:11,044 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-29 01:07:11,051 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-29 01:07:11,080 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-29 01:07:11,081 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-29 01:07:11,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-29 01:07:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-29 01:07:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-29 01:07:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-29 01:07:11,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-29 01:07:11,157 INFO L241 CfgBuilder]: Building ICFG [2023-11-29 01:07:11,159 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-29 01:07:11,261 INFO L282 CfgBuilder]: Performing block encoding [2023-11-29 01:07:11,284 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-29 01:07:11,284 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-29 01:07:11,284 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 01:07:11 BoogieIcfgContainer [2023-11-29 01:07:11,285 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-29 01:07:11,287 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-29 01:07:11,287 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-29 01:07:11,289 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-29 01:07:11,290 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 29.11 01:07:10" (1/3) ... [2023-11-29 01:07:11,290 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347bca77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 01:07:11, skipping insertion in model container [2023-11-29 01:07:11,290 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 29.11 01:07:10" (2/3) ... [2023-11-29 01:07:11,291 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347bca77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 29.11 01:07:11, skipping insertion in model container [2023-11-29 01:07:11,291 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 29.11 01:07:11" (3/3) ... [2023-11-29 01:07:11,292 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_07.i [2023-11-29 01:07:11,307 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-29 01:07:11,307 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-29 01:07:11,345 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-29 01:07:11,350 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=PETRI_NET, 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;@2dd96865, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-29 01:07:11,351 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-29 01:07:11,354 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-29 01:07:11,360 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:11,360 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:11,360 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:11,364 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:11,365 INFO L85 PathProgramCache]: Analyzing trace with hash 1148868036, now seen corresponding path program 1 times [2023-11-29 01:07:11,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:11,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680242968] [2023-11-29 01:07:11,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:11,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:11,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:11,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-29 01:07:11,577 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:11,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680242968] [2023-11-29 01:07:11,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680242968] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 01:07:11,578 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-29 01:07:11,579 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-29 01:07:11,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014226194] [2023-11-29 01:07:11,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 01:07:11,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-29 01:07:11,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:11,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-29 01:07:11,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-29 01:07:11,615 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:11,655 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2023-11-29 01:07:11,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-29 01:07:11,658 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-29 01:07:11,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:11,665 INFO L225 Difference]: With dead ends: 23 [2023-11-29 01:07:11,666 INFO L226 Difference]: Without dead ends: 11 [2023-11-29 01:07:11,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-29 01:07:11,672 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 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 [2023-11-29 01:07:11,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 01:07:11,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-29 01:07:11,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-29 01:07:11,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-29 01:07:11,702 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2023-11-29 01:07:11,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:11,702 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-29 01:07:11,703 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,703 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-29 01:07:11,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-29 01:07:11,703 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:11,704 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:11,704 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-29 01:07:11,704 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:11,705 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:11,705 INFO L85 PathProgramCache]: Analyzing trace with hash -790446873, now seen corresponding path program 1 times [2023-11-29 01:07:11,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:11,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028219934] [2023-11-29 01:07:11,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:11,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:11,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:11,851 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-29 01:07:11,851 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:11,851 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028219934] [2023-11-29 01:07:11,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028219934] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:11,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830782745] [2023-11-29 01:07:11,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:11,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:11,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:11,856 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:11,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-29 01:07:11,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:11,935 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-29 01:07:11,939 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:07:11,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-29 01:07:11,951 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-29 01:07:11,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830782745] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-29 01:07:11,951 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-29 01:07:11,952 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2023-11-29 01:07:11,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616343969] [2023-11-29 01:07:11,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-29 01:07:11,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-29 01:07:11,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:11,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-29 01:07:11,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 01:07:11,955 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:11,978 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2023-11-29 01:07:11,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-29 01:07:11,979 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-29 01:07:11,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:11,980 INFO L225 Difference]: With dead ends: 23 [2023-11-29 01:07:11,980 INFO L226 Difference]: Without dead ends: 17 [2023-11-29 01:07:11,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-29 01:07:11,982 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 01:07:11,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 01:07:11,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-29 01:07:11,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 12. [2023-11-29 01:07:11,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-11-29 01:07:11,987 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 9 [2023-11-29 01:07:11,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:11,987 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-11-29 01:07:11,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:11,988 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-11-29 01:07:11,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-29 01:07:11,988 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:11,988 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:11,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-29 01:07:12,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:12,194 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:12,195 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:12,195 INFO L85 PathProgramCache]: Analyzing trace with hash 1317396867, now seen corresponding path program 1 times [2023-11-29 01:07:12,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:12,195 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909037111] [2023-11-29 01:07:12,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:12,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:12,266 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-29 01:07:12,266 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:12,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909037111] [2023-11-29 01:07:12,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909037111] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:12,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939575168] [2023-11-29 01:07:12,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:12,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:12,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:12,271 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:12,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-29 01:07:12,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:12,342 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-29 01:07:12,343 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:07:12,374 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-29 01:07:12,374 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:07:12,395 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-29 01:07:12,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939575168] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:07:12,395 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:07:12,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-29 01:07:12,396 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250081834] [2023-11-29 01:07:12,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:07:12,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-29 01:07:12,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:12,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-29 01:07:12,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-11-29 01:07:12,398 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:12,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:12,443 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2023-11-29 01:07:12,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-29 01:07:12,444 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-29 01:07:12,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:12,445 INFO L225 Difference]: With dead ends: 35 [2023-11-29 01:07:12,445 INFO L226 Difference]: Without dead ends: 26 [2023-11-29 01:07:12,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2023-11-29 01:07:12,447 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 15 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-29 01:07:12,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-29 01:07:12,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-29 01:07:12,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 16. [2023-11-29 01:07:12,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:12,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-11-29 01:07:12,452 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2023-11-29 01:07:12,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:12,453 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-11-29 01:07:12,453 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:12,453 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-11-29 01:07:12,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-29 01:07:12,454 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:12,454 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:12,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-29 01:07:12,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:12,657 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:12,657 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:12,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1476057404, now seen corresponding path program 2 times [2023-11-29 01:07:12,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:12,657 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157346383] [2023-11-29 01:07:12,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:12,658 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:12,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:12,756 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-29 01:07:12,756 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:12,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157346383] [2023-11-29 01:07:12,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157346383] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:12,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67253215] [2023-11-29 01:07:12,757 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 01:07:12,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:12,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:12,759 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:12,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-29 01:07:12,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 01:07:12,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:07:12,838 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-29 01:07:12,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:07:12,887 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-29 01:07:12,887 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:07:12,940 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-29 01:07:12,941 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67253215] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:07:12,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:07:12,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 15 [2023-11-29 01:07:12,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622563798] [2023-11-29 01:07:12,941 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:07:12,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-29 01:07:12,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:12,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-29 01:07:12,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2023-11-29 01:07:12,943 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:13,016 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2023-11-29 01:07:13,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-29 01:07:13,017 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-29 01:07:13,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:13,018 INFO L225 Difference]: With dead ends: 56 [2023-11-29 01:07:13,018 INFO L226 Difference]: Without dead ends: 46 [2023-11-29 01:07:13,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=106, Unknown=0, NotChecked=0, Total=210 [2023-11-29 01:07:13,020 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 31 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-29 01:07:13,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 28 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-29 01:07:13,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-29 01:07:13,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 26. [2023-11-29 01:07:13,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2023-11-29 01:07:13,027 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 14 [2023-11-29 01:07:13,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:13,027 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2023-11-29 01:07:13,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,028 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2023-11-29 01:07:13,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-29 01:07:13,029 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:13,029 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:13,034 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-29 01:07:13,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:13,230 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:13,230 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:13,230 INFO L85 PathProgramCache]: Analyzing trace with hash 16464004, now seen corresponding path program 3 times [2023-11-29 01:07:13,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:13,230 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040213081] [2023-11-29 01:07:13,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:13,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:13,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:13,425 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-29 01:07:13,425 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:13,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040213081] [2023-11-29 01:07:13,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040213081] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:13,426 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48464806] [2023-11-29 01:07:13,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-29 01:07:13,426 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:13,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:13,427 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:13,428 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-29 01:07:13,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-29 01:07:13,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:07:13,519 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-29 01:07:13,521 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:07:13,541 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-29 01:07:13,542 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:07:13,608 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-29 01:07:13,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48464806] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:07:13,609 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:07:13,609 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-11-29 01:07:13,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213006020] [2023-11-29 01:07:13,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:07:13,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-29 01:07:13,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:13,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-29 01:07:13,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-11-29 01:07:13,611 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:13,714 INFO L93 Difference]: Finished difference Result 84 states and 92 transitions. [2023-11-29 01:07:13,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-29 01:07:13,714 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2023-11-29 01:07:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:13,715 INFO L225 Difference]: With dead ends: 84 [2023-11-29 01:07:13,716 INFO L226 Difference]: Without dead ends: 78 [2023-11-29 01:07:13,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2023-11-29 01:07:13,717 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 76 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-29 01:07:13,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 37 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-29 01:07:13,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-29 01:07:13,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 32. [2023-11-29 01:07:13,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2023-11-29 01:07:13,726 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 24 [2023-11-29 01:07:13,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:13,726 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2023-11-29 01:07:13,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:13,726 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2023-11-29 01:07:13,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-29 01:07:13,727 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:13,727 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:13,732 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-29 01:07:13,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:13,928 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:13,928 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:13,928 INFO L85 PathProgramCache]: Analyzing trace with hash -2121897660, now seen corresponding path program 4 times [2023-11-29 01:07:13,928 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:13,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803148627] [2023-11-29 01:07:13,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:13,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:13,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:14,173 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-29 01:07:14,174 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:14,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803148627] [2023-11-29 01:07:14,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803148627] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:14,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758403672] [2023-11-29 01:07:14,174 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-29 01:07:14,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:14,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:14,176 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:14,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-29 01:07:14,308 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-29 01:07:14,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:07:14,310 INFO L262 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-29 01:07:14,312 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:07:14,447 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-29 01:07:14,447 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:07:14,730 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-11-29 01:07:14,730 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758403672] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:07:14,730 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:07:14,731 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 38 [2023-11-29 01:07:14,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063655080] [2023-11-29 01:07:14,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:07:14,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-11-29 01:07:14,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:07:14,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-11-29 01:07:14,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=704, Unknown=0, NotChecked=0, Total=1406 [2023-11-29 01:07:14,735 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:14,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:07:14,954 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2023-11-29 01:07:14,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-11-29 01:07:14,955 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2023-11-29 01:07:14,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:07:14,956 INFO L225 Difference]: With dead ends: 141 [2023-11-29 01:07:14,956 INFO L226 Difference]: Without dead ends: 123 [2023-11-29 01:07:14,958 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 585 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=702, Invalid=704, Unknown=0, NotChecked=0, Total=1406 [2023-11-29 01:07:14,959 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 243 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-29 01:07:14,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 61 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-29 01:07:14,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-11-29 01:07:14,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 58. [2023-11-29 01:07:14,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.0526315789473684) internal successors, (60), 57 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:14,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2023-11-29 01:07:14,970 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 30 [2023-11-29 01:07:14,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:07:14,970 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2023-11-29 01:07:14,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:07:14,970 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2023-11-29 01:07:14,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-29 01:07:14,972 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:07:14,972 INFO L195 NwaCegarLoop]: trace histogram [35, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:07:14,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-29 01:07:15,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:15,178 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:07:15,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:07:15,178 INFO L85 PathProgramCache]: Analyzing trace with hash 1282731747, now seen corresponding path program 5 times [2023-11-29 01:07:15,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:07:15,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103398068] [2023-11-29 01:07:15,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:07:15,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:07:15,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:07:15,686 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2023-11-29 01:07:15,687 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:07:15,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103398068] [2023-11-29 01:07:15,687 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103398068] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:07:15,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015751173] [2023-11-29 01:07:15,687 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2023-11-29 01:07:15,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:07:15,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:07:15,688 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:07:15,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-29 01:11:24,526 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 19 check-sat command(s) [2023-11-29 01:11:24,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:11:24,595 INFO L262 TraceCheckSpWp]: Trace formula consists of 495 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-29 01:11:24,599 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:11:24,919 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-11-29 01:11:24,920 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:11:25,990 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-11-29 01:11:25,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015751173] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:11:25,990 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:11:25,990 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 37, 37] total 84 [2023-11-29 01:11:25,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180341696] [2023-11-29 01:11:25,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:11:25,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-11-29 01:11:25,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:11:25,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-11-29 01:11:25,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3485, Invalid=3487, Unknown=0, NotChecked=0, Total=6972 [2023-11-29 01:11:25,999 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 84 states, 84 states have (on average 1.1785714285714286) internal successors, (99), 84 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:11:26,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:11:26,462 INFO L93 Difference]: Finished difference Result 228 states and 284 transitions. [2023-11-29 01:11:26,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2023-11-29 01:11:26,462 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.1785714285714286) internal successors, (99), 84 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2023-11-29 01:11:26,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:11:26,464 INFO L225 Difference]: With dead ends: 228 [2023-11-29 01:11:26,464 INFO L226 Difference]: Without dead ends: 207 [2023-11-29 01:11:26,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3769 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=3485, Invalid=3487, Unknown=0, NotChecked=0, Total=6972 [2023-11-29 01:11:26,467 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 260 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-29 01:11:26,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 133 Invalid, 342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-29 01:11:26,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2023-11-29 01:11:26,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 111. [2023-11-29 01:11:26,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:11:26,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2023-11-29 01:11:26,483 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 56 [2023-11-29 01:11:26,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:11:26,483 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2023-11-29 01:11:26,483 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.1785714285714286) internal successors, (99), 84 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:11:26,483 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2023-11-29 01:11:26,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-29 01:11:26,487 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:11:26,488 INFO L195 NwaCegarLoop]: trace histogram [81, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:11:26,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-29 01:11:26,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:11:26,688 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:11:26,689 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:11:26,689 INFO L85 PathProgramCache]: Analyzing trace with hash 1520038119, now seen corresponding path program 6 times [2023-11-29 01:11:26,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:11:26,689 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789046706] [2023-11-29 01:11:26,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:11:26,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:11:26,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:11:27,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3531 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 3321 trivial. 0 not checked. [2023-11-29 01:11:27,619 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:11:27,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789046706] [2023-11-29 01:11:27,619 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789046706] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:11:27,619 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842480204] [2023-11-29 01:11:27,619 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2023-11-29 01:11:27,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:11:27,619 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:11:27,620 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:11:27,632 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-29 01:17:53,966 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2023-11-29 01:17:53,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:17:54,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 594 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-29 01:17:54,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:17:54,128 INFO L134 CoverageAnalysis]: Checked inductivity of 3531 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 3321 trivial. 0 not checked. [2023-11-29 01:17:54,128 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:17:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3531 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 3321 trivial. 0 not checked. [2023-11-29 01:17:54,667 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842480204] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:17:54,667 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:17:54,667 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 45 [2023-11-29 01:17:54,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416432618] [2023-11-29 01:17:54,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:17:54,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2023-11-29 01:17:54,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:17:54,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2023-11-29 01:17:54,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2023-11-29 01:17:54,670 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 45 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 45 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:17:55,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:17:55,068 INFO L93 Difference]: Finished difference Result 345 states and 369 transitions. [2023-11-29 01:17:55,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2023-11-29 01:17:55,069 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 45 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2023-11-29 01:17:55,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:17:55,071 INFO L225 Difference]: With dead ends: 345 [2023-11-29 01:17:55,072 INFO L226 Difference]: Without dead ends: 339 [2023-11-29 01:17:55,073 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=990, Invalid=990, Unknown=0, NotChecked=0, Total=1980 [2023-11-29 01:17:55,073 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 556 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 556 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-29 01:17:55,073 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [556 Valid, 133 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-29 01:17:55,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2023-11-29 01:17:55,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 133. [2023-11-29 01:17:55,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:17:55,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2023-11-29 01:17:55,089 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 109 [2023-11-29 01:17:55,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:17:55,090 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2023-11-29 01:17:55,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 45 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:17:55,091 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2023-11-29 01:17:55,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-11-29 01:17:55,093 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:17:55,093 INFO L195 NwaCegarLoop]: trace histogram [81, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:17:55,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-29 01:17:55,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:17:55,295 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:17:55,296 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:17:55,296 INFO L85 PathProgramCache]: Analyzing trace with hash -591714457, now seen corresponding path program 7 times [2023-11-29 01:17:55,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:17:55,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993648382] [2023-11-29 01:17:55,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:17:55,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:17:55,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:17:57,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4224 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 3321 trivial. 0 not checked. [2023-11-29 01:17:57,393 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:17:57,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993648382] [2023-11-29 01:17:57,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993648382] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:17:57,393 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869063409] [2023-11-29 01:17:57,393 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-29 01:17:57,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:17:57,393 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:17:57,394 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:17:57,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-29 01:17:57,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:17:57,703 INFO L262 TraceCheckSpWp]: Trace formula consists of 1170 conjuncts, 83 conjunts are in the unsatisfiable core [2023-11-29 01:17:57,708 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:17:58,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4224 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2023-11-29 01:17:58,456 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:18:02,738 INFO L134 CoverageAnalysis]: Checked inductivity of 4224 backedges. 0 proven. 3321 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2023-11-29 01:18:02,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1869063409] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:18:02,739 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:18:02,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 83, 83] total 198 [2023-11-29 01:18:02,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397586689] [2023-11-29 01:18:02,739 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:18:02,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 198 states [2023-11-29 01:18:02,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:18:02,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2023-11-29 01:18:02,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19502, Invalid=19504, Unknown=0, NotChecked=0, Total=39006 [2023-11-29 01:18:02,757 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 198 states, 198 states have (on average 1.1111111111111112) internal successors, (220), 198 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:18:06,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:18:06,765 INFO L93 Difference]: Finished difference Result 585 states and 715 transitions. [2023-11-29 01:18:06,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 198 states. [2023-11-29 01:18:06,766 INFO L78 Accepts]: Start accepts. Automaton has has 198 states, 198 states have (on average 1.1111111111111112) internal successors, (220), 198 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 131 [2023-11-29 01:18:06,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:18:06,769 INFO L225 Difference]: With dead ends: 585 [2023-11-29 01:18:06,769 INFO L226 Difference]: Without dead ends: 535 [2023-11-29 01:18:06,772 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21349 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=19502, Invalid=19504, Unknown=0, NotChecked=0, Total=39006 [2023-11-29 01:18:06,773 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1175 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 445 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1175 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 946 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 445 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-29 01:18:06,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1175 Valid, 292 Invalid, 946 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [445 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-29 01:18:06,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2023-11-29 01:18:06,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 260. [2023-11-29 01:18:06,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 259 states have (on average 1.0115830115830116) internal successors, (262), 259 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:18:06,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 262 transitions. [2023-11-29 01:18:06,792 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 262 transitions. Word has length 131 [2023-11-29 01:18:06,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:18:06,793 INFO L495 AbstractCegarLoop]: Abstraction has 260 states and 262 transitions. [2023-11-29 01:18:06,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 198 states, 198 states have (on average 1.1111111111111112) internal successors, (220), 198 states have internal predecessors, (220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:18:06,794 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 262 transitions. [2023-11-29 01:18:06,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2023-11-29 01:18:06,799 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:18:06,799 INFO L195 NwaCegarLoop]: trace histogram [195, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:18:06,806 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-29 01:18:06,999 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:18:07,000 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:18:07,000 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:18:07,000 INFO L85 PathProgramCache]: Analyzing trace with hash 414100323, now seen corresponding path program 8 times [2023-11-29 01:18:07,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:18:07,000 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384403462] [2023-11-29 01:18:07,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:18:07,001 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:18:07,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:18:10,796 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 19110 trivial. 0 not checked. [2023-11-29 01:18:10,796 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:18:10,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384403462] [2023-11-29 01:18:10,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384403462] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:18:10,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361799290] [2023-11-29 01:18:10,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2023-11-29 01:18:10,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:18:10,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:18:10,798 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:18:10,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-29 01:18:11,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2023-11-29 01:18:11,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-29 01:18:11,342 INFO L262 TraceCheckSpWp]: Trace formula consists of 2313 conjuncts, 197 conjunts are in the unsatisfiable core [2023-11-29 01:18:11,350 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-29 01:18:13,878 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 0 proven. 19110 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2023-11-29 01:18:13,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-29 01:18:32,674 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 0 proven. 19110 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2023-11-29 01:18:32,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361799290] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-29 01:18:32,675 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-29 01:18:32,675 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 197, 197] total 423 [2023-11-29 01:18:32,675 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006286693] [2023-11-29 01:18:32,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-29 01:18:32,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 423 states [2023-11-29 01:18:32,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-29 01:18:32,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 423 interpolants. [2023-11-29 01:18:32,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89252, Invalid=89254, Unknown=0, NotChecked=0, Total=178506 [2023-11-29 01:18:32,705 INFO L87 Difference]: Start difference. First operand 260 states and 262 transitions. Second operand has 423 states, 423 states have (on average 1.0898345153664302) internal successors, (461), 423 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:19:01,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-29 01:19:01,539 INFO L93 Difference]: Finished difference Result 997 states and 1254 transitions. [2023-11-29 01:19:01,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 423 states. [2023-11-29 01:19:01,540 INFO L78 Accepts]: Start accepts. Automaton has has 423 states, 423 states have (on average 1.0898345153664302) internal successors, (461), 423 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 258 [2023-11-29 01:19:01,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-29 01:19:01,544 INFO L225 Difference]: With dead ends: 997 [2023-11-29 01:19:01,544 INFO L226 Difference]: Without dead ends: 934 [2023-11-29 01:19:01,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 421 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107555 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=89252, Invalid=89254, Unknown=0, NotChecked=0, Total=178506 [2023-11-29 01:19:01,552 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 1895 mSDsluCounter, 522 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 740 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1895 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 1699 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 740 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-29 01:19:01,553 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1895 Valid, 529 Invalid, 1699 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [740 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-29 01:19:01,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 934 states. [2023-11-29 01:19:01,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 934 to 514. [2023-11-29 01:19:01,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 1.0058479532163742) internal successors, (516), 513 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:19:01,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 516 transitions. [2023-11-29 01:19:01,573 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 516 transitions. Word has length 258 [2023-11-29 01:19:01,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-29 01:19:01,573 INFO L495 AbstractCegarLoop]: Abstraction has 514 states and 516 transitions. [2023-11-29 01:19:01,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 423 states, 423 states have (on average 1.0898345153664302) internal successors, (461), 423 states have internal predecessors, (461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-29 01:19:01,574 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 516 transitions. [2023-11-29 01:19:01,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 513 [2023-11-29 01:19:01,580 INFO L187 NwaCegarLoop]: Found error trace [2023-11-29 01:19:01,580 INFO L195 NwaCegarLoop]: trace histogram [420, 84, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-29 01:19:01,588 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-29 01:19:01,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-29 01:19:01,781 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-29 01:19:01,781 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-29 01:19:01,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1879002884, now seen corresponding path program 9 times [2023-11-29 01:19:01,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-29 01:19:01,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589788840] [2023-11-29 01:19:01,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-29 01:19:01,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-29 01:19:02,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-29 01:19:10,870 INFO L134 CoverageAnalysis]: Checked inductivity of 91980 backedges. 0 proven. 3570 refuted. 0 times theorem prover too weak. 88410 trivial. 0 not checked. [2023-11-29 01:19:10,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-29 01:19:10,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589788840] [2023-11-29 01:19:10,871 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589788840] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-29 01:19:10,871 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417894544] [2023-11-29 01:19:10,871 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-29 01:19:10,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-29 01:19:10,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 [2023-11-29 01:19:10,872 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-29 01:19:10,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a75827f0-3325-46cd-a700-d74fd42811d0/bin/uautomizer-verify-BQ2R08f2Ya/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process