./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c --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_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme --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 ac02a57e98f6481647f49b84c91fda6d0505e35fbffb37ed6b508f20e911a1af --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-26 11:46:46,814 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-26 11:46:46,901 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-26 11:46:46,907 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-26 11:46:46,908 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-26 11:46:46,932 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-26 11:46:46,933 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-26 11:46:46,933 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-26 11:46:46,934 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2023-11-26 11:46:46,935 INFO L153 SettingsManager]: * Use memory slicer=true [2023-11-26 11:46:46,936 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-26 11:46:46,936 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-26 11:46:46,937 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-26 11:46:46,938 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-26 11:46:46,939 INFO L153 SettingsManager]: * Use SBE=true [2023-11-26 11:46:46,939 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-26 11:46:46,940 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-26 11:46:46,941 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-26 11:46:46,941 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-26 11:46:46,942 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-26 11:46:46,943 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-26 11:46:46,943 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-26 11:46:46,944 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-26 11:46:46,945 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-26 11:46:46,945 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-26 11:46:46,946 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-26 11:46:46,946 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-26 11:46:46,947 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-26 11:46:46,947 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-26 11:46:46,948 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-26 11:46:46,948 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-26 11:46:46,949 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 11:46:46,949 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-26 11:46:46,950 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-26 11:46:46,950 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-26 11:46:46,950 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-26 11:46:46,951 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-26 11:46:46,951 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-26 11:46:46,951 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-26 11:46:46,952 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-26 11:46:46,952 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-26 11:46:46,952 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-26 11:46:46,953 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_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ac02a57e98f6481647f49b84c91fda6d0505e35fbffb37ed6b508f20e911a1af [2023-11-26 11:46:47,278 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-26 11:46:47,308 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-26 11:46:47,311 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-26 11:46:47,312 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-26 11:46:47,313 INFO L274 PluginConnector]: CDTParser initialized [2023-11-26 11:46:47,314 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/../../sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c [2023-11-26 11:46:50,313 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-26 11:46:50,589 INFO L384 CDTParser]: Found 1 translation units. [2023-11-26 11:46:50,591 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c [2023-11-26 11:46:50,600 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/data/af7fb4523/1cf1f1efca7248b594fb24e72c433a14/FLAG58e8d2575 [2023-11-26 11:46:50,922 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/data/af7fb4523/1cf1f1efca7248b594fb24e72c433a14 [2023-11-26 11:46:50,930 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-26 11:46:50,935 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-26 11:46:50,937 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-26 11:46:50,937 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-26 11:46:50,946 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-26 11:46:50,947 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 11:46:50" (1/1) ... [2023-11-26 11:46:50,948 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14a55db8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:50, skipping insertion in model container [2023-11-26 11:46:50,949 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 11:46:50" (1/1) ... [2023-11-26 11:46:50,975 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-26 11:46:51,161 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c[1052,1065] [2023-11-26 11:46:51,181 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 11:46:51,193 INFO L202 MainTranslator]: Completed pre-run [2023-11-26 11:46:51,205 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_8ef5a7fd-c5f4-48ff-9927-677500d23f23/sv-benchmarks/c/recursified_nla-digbench/recursified_sqrt1-ll.c[1052,1065] [2023-11-26 11:46:51,218 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-26 11:46:51,249 INFO L206 MainTranslator]: Completed translation [2023-11-26 11:46:51,250 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51 WrapperNode [2023-11-26 11:46:51,250 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-26 11:46:51,251 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-26 11:46:51,252 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-26 11:46:51,253 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-26 11:46:51,263 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,276 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,315 INFO L138 Inliner]: procedures = 16, calls = 58, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 60 [2023-11-26 11:46:51,315 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-26 11:46:51,316 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-26 11:46:51,316 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-26 11:46:51,317 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-26 11:46:51,328 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,329 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,331 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,348 INFO L175 MemorySlicer]: Split 33 memory accesses to 5 slices as follows [2, 9, 12, 8, 2]. 36 percent of accesses are in the largest equivalence class. The 2 initializations are split as follows [2, 0, 0, 0, 0]. The 7 writes are split as follows [0, 2, 2, 2, 1]. [2023-11-26 11:46:51,349 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,349 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,359 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,361 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,363 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,365 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,381 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-26 11:46:51,382 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-26 11:46:51,382 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-26 11:46:51,382 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-26 11:46:51,383 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (1/1) ... [2023-11-26 11:46:51,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2023-11-26 11:46:51,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:46:51,436 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2023-11-26 11:46:51,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2023-11-26 11:46:51,477 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-26 11:46:51,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#0 [2023-11-26 11:46:51,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#1 [2023-11-26 11:46:51,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#2 [2023-11-26 11:46:51,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#3 [2023-11-26 11:46:51,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int#4 [2023-11-26 11:46:51,479 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-26 11:46:51,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#0 [2023-11-26 11:46:51,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#1 [2023-11-26 11:46:51,479 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#2 [2023-11-26 11:46:51,480 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#3 [2023-11-26 11:46:51,480 INFO L130 BoogieDeclarations]: Found specification of procedure write~int#4 [2023-11-26 11:46:51,480 INFO L130 BoogieDeclarations]: Found specification of procedure func_to_recursive_line_29_to_40_0 [2023-11-26 11:46:51,480 INFO L138 BoogieDeclarations]: Found implementation of procedure func_to_recursive_line_29_to_40_0 [2023-11-26 11:46:51,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-26 11:46:51,481 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-26 11:46:51,481 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#0 [2023-11-26 11:46:51,481 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#1 [2023-11-26 11:46:51,481 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#2 [2023-11-26 11:46:51,481 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#3 [2023-11-26 11:46:51,482 INFO L130 BoogieDeclarations]: Found specification of procedure read~int#4 [2023-11-26 11:46:51,482 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-26 11:46:51,482 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-26 11:46:51,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-26 11:46:51,576 INFO L241 CfgBuilder]: Building ICFG [2023-11-26 11:46:51,579 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-26 11:46:51,777 INFO L282 CfgBuilder]: Performing block encoding [2023-11-26 11:46:51,808 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-26 11:46:51,808 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-26 11:46:51,809 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 11:46:51 BoogieIcfgContainer [2023-11-26 11:46:51,809 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-26 11:46:51,812 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-26 11:46:51,812 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-26 11:46:51,816 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-26 11:46:51,816 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 11:46:50" (1/3) ... [2023-11-26 11:46:51,817 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fffa12c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 11:46:51, skipping insertion in model container [2023-11-26 11:46:51,817 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 11:46:51" (2/3) ... [2023-11-26 11:46:51,817 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fffa12c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 11:46:51, skipping insertion in model container [2023-11-26 11:46:51,818 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 11:46:51" (3/3) ... [2023-11-26 11:46:51,819 INFO L112 eAbstractionObserver]: Analyzing ICFG recursified_sqrt1-ll.c [2023-11-26 11:46:51,840 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-26 11:46:51,841 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-26 11:46:51,887 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-26 11:46:51,895 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;@4d679e58, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-26 11:46:51,895 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-26 11:46:51,899 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-26 11:46:51,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-26 11:46:51,908 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:46:51,909 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:46:51,909 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:46:51,915 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:46:51,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1408384077, now seen corresponding path program 1 times [2023-11-26 11:46:51,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:46:51,926 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285990205] [2023-11-26 11:46:51,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:46:51,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:46:52,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:46:52,928 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:46:52,929 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:46:52,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285990205] [2023-11-26 11:46:52,930 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1285990205] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 11:46:52,930 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 11:46:52,930 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-26 11:46:52,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301717644] [2023-11-26 11:46:52,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 11:46:52,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-26 11:46:52,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:46:52,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-26 11:46:52,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-26 11:46:52,992 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 8 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:46:53,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:46:53,297 INFO L93 Difference]: Finished difference Result 76 states and 113 transitions. [2023-11-26 11:46:53,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-26 11:46:53,300 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-26 11:46:53,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:46:53,309 INFO L225 Difference]: With dead ends: 76 [2023-11-26 11:46:53,309 INFO L226 Difference]: Without dead ends: 47 [2023-11-26 11:46:53,315 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-26 11:46:53,320 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 22 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-26 11:46:53,323 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 106 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-26 11:46:53,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-26 11:46:53,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 41. [2023-11-26 11:46:53,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.12) internal successors, (28), 27 states have internal predecessors, (28), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2023-11-26 11:46:53,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2023-11-26 11:46:53,419 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 8 [2023-11-26 11:46:53,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:46:53,420 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2023-11-26 11:46:53,421 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.0) internal successors, (6), 5 states have internal predecessors, (6), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-26 11:46:53,421 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2023-11-26 11:46:53,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-26 11:46:53,424 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:46:53,424 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:46:53,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-26 11:46:53,425 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:46:53,426 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:46:53,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1735781632, now seen corresponding path program 1 times [2023-11-26 11:46:53,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:46:53,428 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79084392] [2023-11-26 11:46:53,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:46:53,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:46:53,474 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:46:53,474 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1151535397] [2023-11-26 11:46:53,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:46:53,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:46:53,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:46:53,479 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:46:53,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-26 11:46:53,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:46:53,610 INFO L262 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 67 conjunts are in the unsatisfiable core [2023-11-26 11:46:53,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:46:53,709 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 [2023-11-26 11:46:53,720 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 [2023-11-26 11:46:53,731 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 [2023-11-26 11:46:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:46:54,243 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:46:54,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-26 11:46:54,785 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:46:54,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79084392] [2023-11-26 11:46:54,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:46:54,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151535397] [2023-11-26 11:46:54,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151535397] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:46:54,786 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-26 11:46:54,786 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 23 [2023-11-26 11:46:54,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612090095] [2023-11-26 11:46:54,788 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-26 11:46:54,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-26 11:46:54,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:46:54,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-26 11:46:54,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=428, Unknown=1, NotChecked=0, Total=506 [2023-11-26 11:46:54,793 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 23 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-26 11:46:59,503 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 4.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=true, quantifiers [1] [2023-11-26 11:47:07,610 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 [1] [2023-11-26 11:47:08,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:08,249 INFO L93 Difference]: Finished difference Result 68 states and 81 transitions. [2023-11-26 11:47:08,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-26 11:47:08,250 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2023-11-26 11:47:08,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:08,253 INFO L225 Difference]: With dead ends: 68 [2023-11-26 11:47:08,253 INFO L226 Difference]: Without dead ends: 66 [2023-11-26 11:47:08,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=197, Invalid=991, Unknown=2, NotChecked=0, Total=1190 [2023-11-26 11:47:08,256 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 72 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 42 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:08,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 94 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 296 Invalid, 2 Unknown, 0 Unchecked, 8.7s Time] [2023-11-26 11:47:08,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-26 11:47:08,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2023-11-26 11:47:08,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 38 states have (on average 1.105263157894737) internal successors, (42), 40 states have internal predecessors, (42), 14 states have call successors, (14), 7 states have call predecessors, (14), 8 states have return successors, (14), 13 states have call predecessors, (14), 12 states have call successors, (14) [2023-11-26 11:47:08,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2023-11-26 11:47:08,314 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 14 [2023-11-26 11:47:08,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:08,317 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2023-11-26 11:47:08,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 15 states have internal predecessors, (19), 6 states have call successors, (6), 6 states have call predecessors, (6), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-26 11:47:08,318 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2023-11-26 11:47:08,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-26 11:47:08,319 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:08,320 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:08,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:08,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:08,528 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:08,528 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:08,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1054740085, now seen corresponding path program 1 times [2023-11-26 11:47:08,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:08,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048359964] [2023-11-26 11:47:08,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:08,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:08,550 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:08,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [582222428] [2023-11-26 11:47:08,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:08,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:08,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:08,553 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:08,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-26 11:47:08,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:08,663 INFO L262 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 53 conjunts are in the unsatisfiable core [2023-11-26 11:47:08,669 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:08,683 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 [2023-11-26 11:47:08,693 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 [2023-11-26 11:47:09,167 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-26 11:47:09,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:09,507 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-26 11:47:09,507 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:09,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048359964] [2023-11-26 11:47:09,507 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:09,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582222428] [2023-11-26 11:47:09,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582222428] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-26 11:47:09,508 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-26 11:47:09,508 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 17 [2023-11-26 11:47:09,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070185190] [2023-11-26 11:47:09,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 11:47:09,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-26 11:47:09,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:09,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-26 11:47:09,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-11-26 11:47:09,510 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-26 11:47:11,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:11,124 INFO L93 Difference]: Finished difference Result 73 states and 82 transitions. [2023-11-26 11:47:11,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-26 11:47:11,125 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 20 [2023-11-26 11:47:11,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:11,127 INFO L225 Difference]: With dead ends: 73 [2023-11-26 11:47:11,127 INFO L226 Difference]: Without dead ends: 71 [2023-11-26 11:47:11,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2023-11-26 11:47:11,129 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 19 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:11,129 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 91 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-26 11:47:11,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-11-26 11:47:11,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2023-11-26 11:47:11,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 14 states have call successors, (14), 9 states have call predecessors, (14), 10 states have return successors, (14), 13 states have call predecessors, (14), 12 states have call successors, (14) [2023-11-26 11:47:11,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 76 transitions. [2023-11-26 11:47:11,152 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 76 transitions. Word has length 20 [2023-11-26 11:47:11,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:11,152 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 76 transitions. [2023-11-26 11:47:11,153 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-26 11:47:11,153 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 76 transitions. [2023-11-26 11:47:11,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-26 11:47:11,154 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:11,155 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:11,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:11,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:11,362 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:11,362 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:11,362 INFO L85 PathProgramCache]: Analyzing trace with hash 1398908834, now seen corresponding path program 1 times [2023-11-26 11:47:11,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:11,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937570698] [2023-11-26 11:47:11,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:11,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:11,402 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:11,402 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1992106082] [2023-11-26 11:47:11,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:11,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:11,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:11,404 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:11,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-26 11:47:11,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:11,536 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 71 conjunts are in the unsatisfiable core [2023-11-26 11:47:11,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:11,567 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 [2023-11-26 11:47:11,581 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 [2023-11-26 11:47:12,094 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:12,102 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:12,313 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-26 11:47:12,313 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:12,705 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-26 11:47:12,705 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:12,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937570698] [2023-11-26 11:47:12,705 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:12,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992106082] [2023-11-26 11:47:12,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992106082] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-26 11:47:12,706 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-26 11:47:12,706 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 19 [2023-11-26 11:47:12,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946248420] [2023-11-26 11:47:12,706 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-26 11:47:12,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-26 11:47:12,707 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:12,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-26 11:47:12,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=293, Unknown=0, NotChecked=0, Total=342 [2023-11-26 11:47:12,709 INFO L87 Difference]: Start difference. First operand 69 states and 76 transitions. Second operand has 19 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-26 11:47:13,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:13,866 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2023-11-26 11:47:13,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-26 11:47:13,869 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 30 [2023-11-26 11:47:13,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:13,876 INFO L225 Difference]: With dead ends: 93 [2023-11-26 11:47:13,876 INFO L226 Difference]: Without dead ends: 91 [2023-11-26 11:47:13,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 36 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812 [2023-11-26 11:47:13,879 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 70 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:13,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 155 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-26 11:47:13,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-11-26 11:47:13,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 77. [2023-11-26 11:47:13,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 52 states have internal predecessors, (53), 15 states have call successors, (15), 10 states have call predecessors, (15), 12 states have return successors, (19), 15 states have call predecessors, (19), 14 states have call successors, (19) [2023-11-26 11:47:13,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2023-11-26 11:47:13,943 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 30 [2023-11-26 11:47:13,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:13,945 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2023-11-26 11:47:13,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 7 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-26 11:47:13,945 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2023-11-26 11:47:13,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-26 11:47:13,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:13,951 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:13,972 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:14,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:14,162 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:14,162 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:14,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1438102184, now seen corresponding path program 1 times [2023-11-26 11:47:14,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:14,162 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547508433] [2023-11-26 11:47:14,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:14,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:14,182 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:14,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [460341883] [2023-11-26 11:47:14,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:14,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:14,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:14,184 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:14,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-26 11:47:14,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:14,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-26 11:47:14,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:14,295 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 [2023-11-26 11:47:14,302 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 [2023-11-26 11:47:14,478 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-26 11:47:14,478 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-26 11:47:14,478 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:14,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547508433] [2023-11-26 11:47:14,479 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:14,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460341883] [2023-11-26 11:47:14,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460341883] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-26 11:47:14,479 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-26 11:47:14,479 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-26 11:47:14,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675098193] [2023-11-26 11:47:14,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-26 11:47:14,480 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-26 11:47:14,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:14,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-26 11:47:14,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-26 11:47:14,481 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-26 11:47:14,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:14,744 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2023-11-26 11:47:14,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-26 11:47:14,745 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2023-11-26 11:47:14,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:14,747 INFO L225 Difference]: With dead ends: 91 [2023-11-26 11:47:14,747 INFO L226 Difference]: Without dead ends: 89 [2023-11-26 11:47:14,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-11-26 11:47:14,748 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 13 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:14,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 52 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-26 11:47:14,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-26 11:47:14,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 85. [2023-11-26 11:47:14,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 57 states have internal predecessors, (58), 16 states have call successors, (16), 11 states have call predecessors, (16), 14 states have return successors, (21), 16 states have call predecessors, (21), 15 states have call successors, (21) [2023-11-26 11:47:14,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2023-11-26 11:47:14,813 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 30 [2023-11-26 11:47:14,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:14,814 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2023-11-26 11:47:14,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-26 11:47:14,814 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2023-11-26 11:47:14,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-26 11:47:14,816 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:14,816 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:14,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:15,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:15,024 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:15,024 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:15,024 INFO L85 PathProgramCache]: Analyzing trace with hash -1300709659, now seen corresponding path program 1 times [2023-11-26 11:47:15,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:15,024 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447928880] [2023-11-26 11:47:15,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:15,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:15,038 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:15,038 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1157878349] [2023-11-26 11:47:15,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:15,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:15,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:15,039 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:15,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-26 11:47:15,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:15,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-26 11:47:15,152 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:15,158 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 [2023-11-26 11:47:15,164 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 [2023-11-26 11:47:15,171 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 [2023-11-26 11:47:15,564 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-26 11:47:15,564 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:20,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:20,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447928880] [2023-11-26 11:47:20,960 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:20,960 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1157878349] [2023-11-26 11:47:20,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1157878349] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:47:20,960 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-26 11:47:20,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2023-11-26 11:47:20,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236596805] [2023-11-26 11:47:20,961 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-26 11:47:20,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-26 11:47:20,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:20,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-26 11:47:20,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=349, Unknown=1, NotChecked=0, Total=420 [2023-11-26 11:47:20,963 INFO L87 Difference]: Start difference. First operand 85 states and 95 transitions. Second operand has 12 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-26 11:47:21,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:21,822 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2023-11-26 11:47:21,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-26 11:47:21,823 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2023-11-26 11:47:21,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:21,825 INFO L225 Difference]: With dead ends: 101 [2023-11-26 11:47:21,825 INFO L226 Difference]: Without dead ends: 97 [2023-11-26 11:47:21,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=143, Invalid=612, Unknown=1, NotChecked=0, Total=756 [2023-11-26 11:47:21,826 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:21,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 66 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-26 11:47:21,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-26 11:47:21,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 95. [2023-11-26 11:47:21,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 61 states have (on average 1.0655737704918034) internal successors, (65), 63 states have internal predecessors, (65), 18 states have call successors, (18), 13 states have call predecessors, (18), 15 states have return successors, (22), 18 states have call predecessors, (22), 16 states have call successors, (22) [2023-11-26 11:47:21,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 105 transitions. [2023-11-26 11:47:21,880 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 105 transitions. Word has length 36 [2023-11-26 11:47:21,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:21,883 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 105 transitions. [2023-11-26 11:47:21,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-26 11:47:21,883 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 105 transitions. [2023-11-26 11:47:21,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-26 11:47:21,887 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:21,887 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 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] [2023-11-26 11:47:21,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:22,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-26 11:47:22,094 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:22,094 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:22,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1658463312, now seen corresponding path program 1 times [2023-11-26 11:47:22,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:22,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137338564] [2023-11-26 11:47:22,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:22,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:22,110 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:22,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [197379189] [2023-11-26 11:47:22,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:22,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:22,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:22,112 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:22,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-26 11:47:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:22,236 INFO L262 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 75 conjunts are in the unsatisfiable core [2023-11-26 11:47:22,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:22,284 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 [2023-11-26 11:47:22,292 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 [2023-11-26 11:47:22,297 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 [2023-11-26 11:47:23,421 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-26 11:47:23,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:30,141 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:30,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137338564] [2023-11-26 11:47:30,141 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:30,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197379189] [2023-11-26 11:47:30,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197379189] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:47:30,142 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-26 11:47:30,142 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2023-11-26 11:47:30,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264271119] [2023-11-26 11:47:30,142 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-26 11:47:30,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-26 11:47:30,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:30,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-26 11:47:30,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=610, Unknown=1, NotChecked=0, Total=702 [2023-11-26 11:47:30,145 INFO L87 Difference]: Start difference. First operand 95 states and 105 transitions. Second operand has 18 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-26 11:47:33,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:33,161 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2023-11-26 11:47:33,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-26 11:47:33,162 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2023-11-26 11:47:33,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:33,163 INFO L225 Difference]: With dead ends: 97 [2023-11-26 11:47:33,164 INFO L226 Difference]: Without dead ends: 77 [2023-11-26 11:47:33,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=240, Invalid=1479, Unknown=3, NotChecked=0, Total=1722 [2023-11-26 11:47:33,166 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 36 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:33,167 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 61 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 335 Invalid, 3 Unknown, 0 Unchecked, 0.7s Time] [2023-11-26 11:47:33,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-26 11:47:33,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-26 11:47:33,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 51 states have internal predecessors, (52), 15 states have call successors, (15), 10 states have call predecessors, (15), 12 states have return successors, (19), 15 states have call predecessors, (19), 14 states have call successors, (19) [2023-11-26 11:47:33,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 86 transitions. [2023-11-26 11:47:33,201 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 86 transitions. Word has length 42 [2023-11-26 11:47:33,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:33,201 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 86 transitions. [2023-11-26 11:47:33,201 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 6 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-26 11:47:33,201 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 86 transitions. [2023-11-26 11:47:33,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-26 11:47:33,203 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:33,203 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:33,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:33,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-26 11:47:33,407 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:33,408 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:33,408 INFO L85 PathProgramCache]: Analyzing trace with hash 983693574, now seen corresponding path program 1 times [2023-11-26 11:47:33,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:33,408 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352919676] [2023-11-26 11:47:33,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:33,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:33,426 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:33,427 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1005619193] [2023-11-26 11:47:33,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:33,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:33,427 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:33,429 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:33,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-26 11:47:33,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:33,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-26 11:47:33,611 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:33,624 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 [2023-11-26 11:47:33,635 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 [2023-11-26 11:47:34,078 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:34,087 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:34,203 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2023-11-26 11:47:34,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:34,657 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 16 treesize of output 12 [2023-11-26 11:47:34,761 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:34,761 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352919676] [2023-11-26 11:47:34,762 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:34,762 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005619193] [2023-11-26 11:47:34,762 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1005619193] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:47:34,762 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-26 11:47:34,762 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-11-26 11:47:34,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129017724] [2023-11-26 11:47:34,763 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-26 11:47:34,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-26 11:47:34,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:34,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-26 11:47:34,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2023-11-26 11:47:34,764 INFO L87 Difference]: Start difference. First operand 77 states and 86 transitions. Second operand has 10 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-26 11:47:35,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:35,200 INFO L93 Difference]: Finished difference Result 89 states and 99 transitions. [2023-11-26 11:47:35,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-26 11:47:35,201 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 54 [2023-11-26 11:47:35,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:35,202 INFO L225 Difference]: With dead ends: 89 [2023-11-26 11:47:35,202 INFO L226 Difference]: Without dead ends: 87 [2023-11-26 11:47:35,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2023-11-26 11:47:35,204 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:35,204 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 58 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-26 11:47:35,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-11-26 11:47:35,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 83. [2023-11-26 11:47:35,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 55 states have internal predecessors, (56), 16 states have call successors, (16), 11 states have call predecessors, (16), 13 states have return successors, (20), 16 states have call predecessors, (20), 15 states have call successors, (20) [2023-11-26 11:47:35,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 92 transitions. [2023-11-26 11:47:35,228 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 92 transitions. Word has length 54 [2023-11-26 11:47:35,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:35,228 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 92 transitions. [2023-11-26 11:47:35,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.75) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2023-11-26 11:47:35,229 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 92 transitions. [2023-11-26 11:47:35,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-11-26 11:47:35,230 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:35,230 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:35,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:35,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-26 11:47:35,435 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:35,436 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:35,436 INFO L85 PathProgramCache]: Analyzing trace with hash -1709019117, now seen corresponding path program 1 times [2023-11-26 11:47:35,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:35,436 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704749905] [2023-11-26 11:47:35,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:35,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:35,477 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:35,478 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [609130407] [2023-11-26 11:47:35,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:35,478 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:35,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:35,479 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:35,510 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-26 11:47:35,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:35,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 102 conjunts are in the unsatisfiable core [2023-11-26 11:47:35,629 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:35,636 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 [2023-11-26 11:47:35,645 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 [2023-11-26 11:47:35,975 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 [2023-11-26 11:47:36,677 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:36,694 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:37,292 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 63 proven. 18 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-26 11:47:37,292 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-26 11:47:44,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-26 11:47:44,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704749905] [2023-11-26 11:47:44,295 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-26 11:47:44,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609130407] [2023-11-26 11:47:44,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609130407] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-26 11:47:44,295 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-11-26 11:47:44,295 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2023-11-26 11:47:44,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572566722] [2023-11-26 11:47:44,299 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-11-26 11:47:44,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-26 11:47:44,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-26 11:47:44,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-26 11:47:44,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=932, Unknown=1, NotChecked=0, Total=1056 [2023-11-26 11:47:44,303 INFO L87 Difference]: Start difference. First operand 83 states and 92 transitions. Second operand has 23 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2023-11-26 11:47:47,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-26 11:47:47,105 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2023-11-26 11:47:47,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-11-26 11:47:47,106 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) Word has length 60 [2023-11-26 11:47:47,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-26 11:47:47,108 INFO L225 Difference]: With dead ends: 99 [2023-11-26 11:47:47,108 INFO L226 Difference]: Without dead ends: 95 [2023-11-26 11:47:47,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=348, Invalid=2407, Unknown=1, NotChecked=0, Total=2756 [2023-11-26 11:47:47,111 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 68 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 46 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2023-11-26 11:47:47,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 78 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 488 Invalid, 7 Unknown, 0 Unchecked, 1.2s Time] [2023-11-26 11:47:47,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-26 11:47:47,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2023-11-26 11:47:47,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 60 states have (on average 1.05) internal successors, (63), 61 states have internal predecessors, (63), 18 states have call successors, (18), 13 states have call predecessors, (18), 14 states have return successors, (21), 18 states have call predecessors, (21), 16 states have call successors, (21) [2023-11-26 11:47:47,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 102 transitions. [2023-11-26 11:47:47,145 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 102 transitions. Word has length 60 [2023-11-26 11:47:47,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-26 11:47:47,146 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 102 transitions. [2023-11-26 11:47:47,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 8 states have call successors, (10), 6 states have call predecessors, (10), 6 states have return successors, (9), 6 states have call predecessors, (9), 7 states have call successors, (9) [2023-11-26 11:47:47,147 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 102 transitions. [2023-11-26 11:47:47,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-11-26 11:47:47,148 INFO L187 NwaCegarLoop]: Found error trace [2023-11-26 11:47:47,149 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-26 11:47:47,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-26 11:47:47,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:47,383 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-26 11:47:47,384 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-26 11:47:47,384 INFO L85 PathProgramCache]: Analyzing trace with hash 308638302, now seen corresponding path program 1 times [2023-11-26 11:47:47,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-26 11:47:47,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626070998] [2023-11-26 11:47:47,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:47,385 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-26 11:47:47,404 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-26 11:47:47,404 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [280243885] [2023-11-26 11:47:47,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-26 11:47:47,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-26 11:47:47,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 [2023-11-26 11:47:47,406 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-26 11:47:47,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ef5a7fd-c5f4-48ff-9927-677500d23f23/bin/uautomizer-verify-VRDe98Ueme/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-26 11:47:47,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-26 11:47:47,557 INFO L262 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 89 conjunts are in the unsatisfiable core [2023-11-26 11:47:47,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-26 11:47:47,572 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 [2023-11-26 11:47:47,581 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 [2023-11-26 11:47:47,595 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 [2023-11-26 11:47:48,320 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:48,346 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 25 treesize of output 17 [2023-11-26 11:47:48,373 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 [2023-11-26 11:47:49,002 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 60 proven. 17 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2023-11-26 11:47:49,003 INFO L327 TraceCheckSpWp]: Computing backward predicates...