./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8be7027f Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 e972d7fe67c03faae458b4aeefde235726c38e34da23998883d4b544999b0f51 --- Real Ultimate output --- This is Ultimate 0.2.5-wip.dk.perfect-tracechecks-8be7027-m [2024-11-11 21:04:44,309 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-11 21:04:44,377 INFO L114 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-11-11 21:04:44,381 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-11 21:04:44,383 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-11 21:04:44,419 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-11 21:04:44,420 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-11 21:04:44,421 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-11 21:04:44,421 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-11-11 21:04:44,422 INFO L153 SettingsManager]: * Use memory slicer=true [2024-11-11 21:04:44,423 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-11 21:04:44,423 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-11 21:04:44,423 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-11-11 21:04:44,424 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-11-11 21:04:44,425 INFO L153 SettingsManager]: * Use SBE=true [2024-11-11 21:04:44,425 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-11 21:04:44,426 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-11 21:04:44,426 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-11 21:04:44,426 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-11 21:04:44,426 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-11 21:04:44,426 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-11 21:04:44,427 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-11 21:04:44,429 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-11 21:04:44,429 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-11 21:04:44,429 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-11 21:04:44,430 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-11 21:04:44,430 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-11 21:04:44,431 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-11 21:04:44,431 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-11-11 21:04:44,432 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-11-11 21:04:44,433 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-11 21:04:44,433 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:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e972d7fe67c03faae458b4aeefde235726c38e34da23998883d4b544999b0f51 [2024-11-11 21:04:44,647 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-11 21:04:44,679 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-11 21:04:44,681 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-11 21:04:44,682 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-11 21:04:44,683 INFO L274 PluginConnector]: CDTParser initialized [2024-11-11 21:04:44,683 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c [2024-11-11 21:04:46,014 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-11 21:04:46,191 INFO L384 CDTParser]: Found 1 translation units. [2024-11-11 21:04:46,193 INFO L180 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c [2024-11-11 21:04:46,200 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a24ccb661/f6b0044f3e1944e790e10aff6d881cd2/FLAG2e6e85713 [2024-11-11 21:04:46,212 INFO L435 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a24ccb661/f6b0044f3e1944e790e10aff6d881cd2 [2024-11-11 21:04:46,214 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-11 21:04:46,216 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-11 21:04:46,217 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-11 21:04:46,218 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-11 21:04:46,222 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-11 21:04:46,223 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,225 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5811af97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46, skipping insertion in model container [2024-11-11 21:04:46,225 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,245 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-11 21:04:46,388 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c[1106,1119] [2024-11-11 21:04:46,405 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-11 21:04:46,413 INFO L200 MainTranslator]: Completed pre-run [2024-11-11 21:04:46,430 WARN L250 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursified_nla-digbench/recursified_lcm1.c[1106,1119] [2024-11-11 21:04:46,464 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-11 21:04:46,482 INFO L204 MainTranslator]: Completed translation [2024-11-11 21:04:46,482 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46 WrapperNode [2024-11-11 21:04:46,482 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-11 21:04:46,483 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-11 21:04:46,483 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-11 21:04:46,483 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-11 21:04:46,488 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,497 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,539 INFO L138 Inliner]: procedures = 18, calls = 104, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 95 [2024-11-11 21:04:46,544 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-11 21:04:46,545 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-11 21:04:46,545 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-11 21:04:46,545 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-11 21:04:46,560 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,560 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,566 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,594 INFO L175 MemorySlicer]: Split 66 memory accesses to 8 slices as follows [8, 2, 7, 9, 13, 11, 8, 8]. 20 percent of accesses are in the largest equivalence class. The 9 initializations are split as follows [0, 2, 7, 0, 0, 0, 0, 0]. The 10 writes are split as follows [1, 0, 0, 1, 2, 2, 2, 2]. [2024-11-11 21:04:46,594 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,597 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,610 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,618 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,620 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,620 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,630 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-11 21:04:46,631 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-11 21:04:46,635 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-11 21:04:46,635 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-11 21:04:46,636 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (1/1) ... [2024-11-11 21:04:46,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-11-11 21:04:46,656 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-11 21:04:46,674 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-11-11 21:04:46,676 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-11-11 21:04:46,719 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-11 21:04:46,720 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_35_to_38_0 [2024-11-11 21:04:46,720 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_35_to_38_0 [2024-11-11 21:04:46,720 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_48_to_53_0 [2024-11-11 21:04:46,720 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_48_to_53_0 [2024-11-11 21:04:46,720 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-11-11 21:04:46,720 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#5 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#6 [2024-11-11 21:04:46,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#7 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_40_to_45_0 [2024-11-11 21:04:46,722 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_40_to_45_0 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2024-11-11 21:04:46,722 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#5 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#6 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#7 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-11 21:04:46,723 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2024-11-11 21:04:46,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#5 [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#6 [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#7 [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-11-11 21:04:46,724 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-11-11 21:04:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-11 21:04:46,836 INFO L238 CfgBuilder]: Building ICFG [2024-11-11 21:04:46,838 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-11 21:04:47,071 INFO L? ?]: Removed 11 outVars from TransFormulas that were not future-live. [2024-11-11 21:04:47,071 INFO L287 CfgBuilder]: Performing block encoding [2024-11-11 21:04:47,082 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-11 21:04:47,083 INFO L316 CfgBuilder]: Removed 3 assume(true) statements. [2024-11-11 21:04:47,083 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.11 09:04:47 BoogieIcfgContainer [2024-11-11 21:04:47,083 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-11 21:04:47,086 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-11 21:04:47,086 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-11 21:04:47,089 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-11 21:04:47,089 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.11 09:04:46" (1/3) ... [2024-11-11 21:04:47,090 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2293cb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.11 09:04:47, skipping insertion in model container [2024-11-11 21:04:47,090 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.11 09:04:46" (2/3) ... [2024-11-11 21:04:47,090 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2293cb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.11 09:04:47, skipping insertion in model container [2024-11-11 21:04:47,091 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.11 09:04:47" (3/3) ... [2024-11-11 21:04:47,092 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_lcm1.c [2024-11-11 21:04:47,104 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-11 21:04:47,104 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-11 21:04:47,146 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-11 21:04:47,152 INFO L333 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, 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;@eab9156, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-11 21:04:47,152 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-11 21:04:47,156 INFO L276 IsEmpty]: Start isEmpty. Operand has 55 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 37 states have internal predecessors, (42), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2024-11-11 21:04:47,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-11 21:04:47,161 INFO L210 NwaCegarLoop]: Found error trace [2024-11-11 21:04:47,161 INFO L218 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-11 21:04:47,162 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-11 21:04:47,166 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-11 21:04:47,166 INFO L85 PathProgramCache]: Analyzing trace with hash 895026989, now seen corresponding path program 1 times [2024-11-11 21:04:47,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-11 21:04:47,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144580575] [2024-11-11 21:04:47,173 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:04:47,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-11 21:04:47,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,384 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2024-11-11 21:04:47,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,399 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2024-11-11 21:04:47,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,405 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2024-11-11 21:04:47,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,412 INFO L368 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2024-11-11 21:04:47,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,416 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-11 21:04:47,416 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-11 21:04:47,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144580575] [2024-11-11 21:04:47,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144580575] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-11 21:04:47,417 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-11 21:04:47,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-11 21:04:47,419 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738086901] [2024-11-11 21:04:47,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-11 21:04:47,422 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-11-11 21:04:47,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-11 21:04:47,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-11-11 21:04:47,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-11 21:04:47,443 INFO L87 Difference]: Start difference. First operand has 55 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 37 states have internal predecessors, (42), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Second operand has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2024-11-11 21:04:47,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-11 21:04:47,463 INFO L93 Difference]: Finished difference Result 107 states and 155 transitions. [2024-11-11 21:04:47,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-11-11 21:04:47,469 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) Word has length 33 [2024-11-11 21:04:47,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-11 21:04:47,475 INFO L225 Difference]: With dead ends: 107 [2024-11-11 21:04:47,475 INFO L226 Difference]: Without dead ends: 51 [2024-11-11 21:04:47,477 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-11-11 21:04:47,480 INFO L435 NwaCegarLoop]: 67 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-11 21:04:47,481 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-11 21:04:47,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2024-11-11 21:04:47,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2024-11-11 21:04:47,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 34 states have internal predecessors, (34), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2024-11-11 21:04:47,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2024-11-11 21:04:47,512 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 33 [2024-11-11 21:04:47,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-11 21:04:47,512 INFO L471 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2024-11-11 21:04:47,512 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.0) internal successors, (14), 2 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2024-11-11 21:04:47,512 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2024-11-11 21:04:47,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-11 21:04:47,517 INFO L210 NwaCegarLoop]: Found error trace [2024-11-11 21:04:47,517 INFO L218 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-11 21:04:47,517 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-11 21:04:47,518 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-11 21:04:47,518 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-11 21:04:47,518 INFO L85 PathProgramCache]: Analyzing trace with hash -411491275, now seen corresponding path program 1 times [2024-11-11 21:04:47,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-11 21:04:47,519 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047214046] [2024-11-11 21:04:47,519 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:04:47,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-11 21:04:47,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-11 21:04:47,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1389149535] [2024-11-11 21:04:47,624 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:04:47,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-11 21:04:47,625 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-11 21:04:47,627 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-11 21:04:47,628 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-11 21:04:47,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:47,822 INFO L256 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 75 conjuncts are in the unsatisfiable core [2024-11-11 21:04:47,853 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2024-11-11 21:04:47,948 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-11 21:04:47,951 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-11 21:04:47,966 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-11 21:04:47,973 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-11 21:04:47,979 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-11 21:04:48,068 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-11 21:04:48,073 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-11 21:04:48,085 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-11 21:04:48,090 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-11 21:04:48,140 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-11 21:04:48,141 INFO L308 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-11 21:04:48,141 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-11 21:04:48,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047214046] [2024-11-11 21:04:48,141 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-11 21:04:48,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389149535] [2024-11-11 21:04:48,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389149535] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-11 21:04:48,142 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-11 21:04:48,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-11-11 21:04:48,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923457504] [2024-11-11 21:04:48,142 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-11 21:04:48,143 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-11 21:04:48,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-11 21:04:48,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-11 21:04:48,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-11-11 21:04:48,147 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 8 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-11 21:04:48,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-11 21:04:48,390 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2024-11-11 21:04:48,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-11 21:04:48,391 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 33 [2024-11-11 21:04:48,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-11 21:04:48,395 INFO L225 Difference]: With dead ends: 66 [2024-11-11 21:04:48,396 INFO L226 Difference]: Without dead ends: 64 [2024-11-11 21:04:48,397 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2024-11-11 21:04:48,398 INFO L435 NwaCegarLoop]: 55 mSDtfsCounter, 14 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-11 21:04:48,399 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 334 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-11 21:04:48,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2024-11-11 21:04:48,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2024-11-11 21:04:48,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.131578947368421) internal successors, (43), 42 states have internal predecessors, (43), 16 states have call successors, (16), 7 states have call predecessors, (16), 7 states have return successors, (16), 15 states have call predecessors, (16), 15 states have call successors, (16) [2024-11-11 21:04:48,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 75 transitions. [2024-11-11 21:04:48,416 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 75 transitions. Word has length 33 [2024-11-11 21:04:48,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-11 21:04:48,416 INFO L471 AbstractCegarLoop]: Abstraction has 62 states and 75 transitions. [2024-11-11 21:04:48,417 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2024-11-11 21:04:48,417 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 75 transitions. [2024-11-11 21:04:48,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-11 21:04:48,418 INFO L210 NwaCegarLoop]: Found error trace [2024-11-11 21:04:48,419 INFO L218 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-11 21:04:48,432 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-11 21:04:48,619 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-11 21:04:48,620 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-11 21:04:48,621 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-11 21:04:48,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1464506496, now seen corresponding path program 1 times [2024-11-11 21:04:48,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-11 21:04:48,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650654081] [2024-11-11 21:04:48,621 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:04:48,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-11 21:04:48,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-11 21:04:48,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1621613475] [2024-11-11 21:04:48,714 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:04:48,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-11 21:04:48,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-11 21:04:48,716 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-11 21:04:48,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-11 21:04:48,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-11 21:04:48,976 INFO L256 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 158 conjuncts are in the unsatisfiable core [2024-11-11 21:04:48,982 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2024-11-11 21:04:48,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-11 21:04:48,992 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2024-11-11 21:04:49,000 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2024-11-11 21:04:49,006 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-11 21:04:49,012 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-11 21:04:49,020 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2024-11-11 21:04:49,522 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2024-11-11 21:04:49,525 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-11 21:04:49,529 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-11 21:04:49,535 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2024-11-11 21:04:49,538 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2024-11-11 21:04:49,588 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-11 21:04:49,589 INFO L312 TraceCheckSpWp]: Computing backward predicates... [2024-11-11 21:04:51,113 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2024-11-11 21:04:51,114 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2024-11-11 21:04:51,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650654081] [2024-11-11 21:04:51,114 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2024-11-11 21:04:51,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621613475] [2024-11-11 21:04:51,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621613475] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-11 21:04:51,114 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2024-11-11 21:04:51,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 21 [2024-11-11 21:04:51,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257710998] [2024-11-11 21:04:51,114 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2024-11-11 21:04:51,115 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2024-11-11 21:04:51,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2024-11-11 21:04:51,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2024-11-11 21:04:51,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2024-11-11 21:04:51,116 INFO L87 Difference]: Start difference. First operand 62 states and 75 transitions. Second operand has 21 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (12), 6 states have call predecessors, (12), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2024-11-11 21:04:57,422 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-11 21:05:01,535 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-11 21:05:03,207 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-11 21:05:08,415 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0, 1] [2024-11-11 21:05:19,221 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 10.81s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [1] [2024-11-11 21:05:24,338 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 5.12s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0, 1] [2024-11-11 21:06:06,515 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 39.81s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [1] [2024-11-11 21:06:08,774 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.26s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [1] [2024-11-11 21:06:29,318 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 17.30s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [0, 1] [2024-11-11 21:06:30,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-11 21:06:30,363 INFO L93 Difference]: Finished difference Result 125 states and 157 transitions. [2024-11-11 21:06:30,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2024-11-11 21:06:30,368 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (12), 6 states have call predecessors, (12), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 43 [2024-11-11 21:06:30,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-11 21:06:30,373 INFO L225 Difference]: With dead ends: 125 [2024-11-11 21:06:30,373 INFO L226 Difference]: Without dead ends: 123 [2024-11-11 21:06:30,373 INFO L434 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=177, Invalid=1013, Unknown=0, NotChecked=0, Total=1190 [2024-11-11 21:06:30,374 INFO L435 NwaCegarLoop]: 47 mSDtfsCounter, 74 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 33 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 90.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 95.6s IncrementalHoareTripleChecker+Time [2024-11-11 21:06:30,376 INFO L436 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 464 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 512 Invalid, 7 Unknown, 0 Unchecked, 95.6s Time] [2024-11-11 21:06:30,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2024-11-11 21:06:30,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 108. [2024-11-11 21:06:30,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 72 states have internal predecessors, (76), 24 states have call successors, (24), 13 states have call predecessors, (24), 16 states have return successors, (31), 23 states have call predecessors, (31), 22 states have call successors, (31) [2024-11-11 21:06:30,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 131 transitions. [2024-11-11 21:06:30,430 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 131 transitions. Word has length 43 [2024-11-11 21:06:30,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-11 21:06:30,430 INFO L471 AbstractCegarLoop]: Abstraction has 108 states and 131 transitions. [2024-11-11 21:06:30,430 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (12), 6 states have call predecessors, (12), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2024-11-11 21:06:30,431 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 131 transitions. [2024-11-11 21:06:30,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2024-11-11 21:06:30,431 INFO L210 NwaCegarLoop]: Found error trace [2024-11-11 21:06:30,431 INFO L218 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-11 21:06:30,453 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-11 21:06:30,632 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2024-11-11 21:06:30,633 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-11 21:06:30,633 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-11 21:06:30,633 INFO L85 PathProgramCache]: Analyzing trace with hash -391399748, now seen corresponding path program 1 times [2024-11-11 21:06:30,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2024-11-11 21:06:30,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704158435] [2024-11-11 21:06:30,634 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:06:30,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-11 21:06:30,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unknown [2024-11-11 21:06:30,723 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2068727951] [2024-11-11 21:06:30,723 INFO L97 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-11 21:06:30,727 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-11 21:06:30,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2024-11-11 21:06:30,731 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-11 21:06:30,735 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process