./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash c8a07fe1a25f7f87a80e2b435a79d4715298ae698f37888069e22026322224ef --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:20:21,208 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:20:21,317 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-11-19 05:20:21,327 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:20:21,328 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:20:21,372 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:20:21,372 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:20:21,373 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:20:21,374 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:20:21,381 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:20:21,381 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:20:21,382 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:20:21,382 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:20:21,383 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:20:21,383 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:20:21,384 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:20:21,384 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:20:21,385 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:20:21,385 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:20:21,385 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:20:21,386 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:20:21,386 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:20:21,387 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:20:21,388 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:20:21,388 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:20:21,388 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:20:21,389 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:20:21,389 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:20:21,390 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:20:21,390 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:20:21,391 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:20:21,391 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:20:21,391 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:20:21,392 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:20:21,392 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:20:21,392 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:20:21,393 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:20:21,393 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:20:21,393 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:20:21,393 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:20:21,394 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:20:21,394 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:20:21,394 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c8a07fe1a25f7f87a80e2b435a79d4715298ae698f37888069e22026322224ef [2023-11-19 05:20:21,644 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:20:21,667 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:20:21,669 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:20:21,670 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:20:21,671 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:20:21,671 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i [2023-11-19 05:20:24,663 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:20:25,184 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:20:25,185 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i [2023-11-19 05:20:25,223 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/data/94432f3b5/c08e2344c28b46fe93522127c7b357c7/FLAG64259a0e3 [2023-11-19 05:20:25,241 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/data/94432f3b5/c08e2344c28b46fe93522127c7b357c7 [2023-11-19 05:20:25,248 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:20:25,251 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:20:25,252 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:20:25,253 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:20:25,258 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:20:25,259 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:20:25" (1/1) ... [2023-11-19 05:20:25,260 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@303b8729 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:25, skipping insertion in model container [2023-11-19 05:20:25,260 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:20:25" (1/1) ... [2023-11-19 05:20:25,369 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:20:25,921 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_671bdef3-267c-4f84-b7ff-4b817809b2ef/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i[95017,95030] [2023-11-19 05:20:26,357 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:20:26,430 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:20:26,555 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_671bdef3-267c-4f84-b7ff-4b817809b2ef/sv-benchmarks/c/ldv-validator-v0.6/linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i[95017,95030] [2023-11-19 05:20:26,675 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:20:26,727 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:20:26,728 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26 WrapperNode [2023-11-19 05:20:26,728 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:20:26,729 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:20:26,729 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:20:26,730 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:20:26,737 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:26,774 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:26,916 INFO L138 Inliner]: procedures = 96, calls = 1035, calls flagged for inlining = 48, calls inlined = 48, statements flattened = 1864 [2023-11-19 05:20:26,917 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:20:26,918 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:20:26,918 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:20:26,918 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:20:26,928 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:26,929 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:26,964 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:26,964 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,038 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,060 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,069 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,090 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,110 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:20:27,116 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:20:27,116 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:20:27,116 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:20:27,117 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (1/1) ... [2023-11-19 05:20:27,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:20:27,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:27,153 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:20:27,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:20:27,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:20:27,197 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:20:27,197 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:20:27,197 INFO L130 BoogieDeclarations]: Found specification of procedure usb_set_serial_data [2023-11-19 05:20:27,197 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_set_serial_data [2023-11-19 05:20:27,198 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_open [2023-11-19 05:20:27,198 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_open [2023-11-19 05:20:27,198 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2023-11-19 05:20:27,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2023-11-19 05:20:27,200 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:20:27,200 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_undef_int_negative [2023-11-19 05:20:27,200 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_undef_int_negative [2023-11-19 05:20:27,200 INFO L130 BoogieDeclarations]: Found specification of procedure usb_set_interface [2023-11-19 05:20:27,200 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_set_interface [2023-11-19 05:20:27,201 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_xfer_bulk [2023-11-19 05:20:27,201 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_xfer_bulk [2023-11-19 05:20:27,201 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:20:27,201 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_free [2023-11-19 05:20:27,201 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_free [2023-11-19 05:20:27,201 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_resume [2023-11-19 05:20:27,202 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_resume [2023-11-19 05:20:27,202 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:20:27,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:20:27,203 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2023-11-19 05:20:27,203 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2023-11-19 05:20:27,203 INFO L130 BoogieDeclarations]: Found specification of procedure printk [2023-11-19 05:20:27,203 INFO L138 BoogieDeclarations]: Found implementation of procedure printk [2023-11-19 05:20:27,204 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_disconnect [2023-11-19 05:20:27,205 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_disconnect [2023-11-19 05:20:27,205 INFO L130 BoogieDeclarations]: Found specification of procedure dev_err [2023-11-19 05:20:27,205 INFO L138 BoogieDeclarations]: Found implementation of procedure dev_err [2023-11-19 05:20:27,206 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_error [2023-11-19 05:20:27,206 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_error [2023-11-19 05:20:27,206 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_deregister [2023-11-19 05:20:27,206 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_deregister [2023-11-19 05:20:27,206 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_disconnect [2023-11-19 05:20:27,206 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_disconnect [2023-11-19 05:20:27,207 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_write [2023-11-19 05:20:27,207 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_write [2023-11-19 05:20:27,207 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2023-11-19 05:20:27,207 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2023-11-19 05:20:27,207 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_write_room [2023-11-19 05:20:27,207 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_write_room [2023-11-19 05:20:27,208 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_suspend [2023-11-19 05:20:27,208 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_suspend [2023-11-19 05:20:27,208 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-19 05:20:27,208 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-19 05:20:27,208 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:20:27,208 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_close [2023-11-19 05:20:27,209 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_close [2023-11-19 05:20:27,209 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:20:27,209 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_zalloc [2023-11-19 05:20:27,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_zalloc [2023-11-19 05:20:27,209 INFO L130 BoogieDeclarations]: Found specification of procedure usb_wwan_chars_in_buffer [2023-11-19 05:20:27,209 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_wwan_chars_in_buffer [2023-11-19 05:20:27,210 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:20:27,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:20:27,561 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:20:27,564 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:20:27,660 INFO L767 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2023-11-19 05:20:29,633 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:20:29,959 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:20:29,959 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-19 05:20:29,967 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:20:29 BoogieIcfgContainer [2023-11-19 05:20:29,968 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:20:29,970 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:20:29,970 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:20:29,973 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:20:29,973 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:20:25" (1/3) ... [2023-11-19 05:20:29,974 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b6ff6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:20:29, skipping insertion in model container [2023-11-19 05:20:29,974 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:20:26" (2/3) ... [2023-11-19 05:20:29,975 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b6ff6cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:20:29, skipping insertion in model container [2023-11-19 05:20:29,975 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:20:29" (3/3) ... [2023-11-19 05:20:29,976 INFO L112 eAbstractionObserver]: Analyzing ICFG linux-stable-c0cc359-104_1a-drivers--usb--serial--qcserial.ko-entry_point.cil.out.i [2023-11-19 05:20:29,994 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:20:29,994 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:20:30,050 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:20:30,057 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@512099b5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:20:30,057 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:20:30,063 INFO L276 IsEmpty]: Start isEmpty. Operand has 321 states, 213 states have (on average 1.4507042253521127) internal successors, (309), 221 states have internal predecessors, (309), 84 states have call successors, (84), 23 states have call predecessors, (84), 22 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) [2023-11-19 05:20:30,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 05:20:30,075 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:30,076 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:30,076 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:30,081 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:30,081 INFO L85 PathProgramCache]: Analyzing trace with hash 416954183, now seen corresponding path program 1 times [2023-11-19 05:20:30,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:30,091 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375265772] [2023-11-19 05:20:30,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:30,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:31,007 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:20:31,008 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:31,008 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375265772] [2023-11-19 05:20:31,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375265772] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:31,009 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:20:31,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:20:31,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466023504] [2023-11-19 05:20:31,013 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:31,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:31,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:31,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:31,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:31,065 INFO L87 Difference]: Start difference. First operand has 321 states, 213 states have (on average 1.4507042253521127) internal successors, (309), 221 states have internal predecessors, (309), 84 states have call successors, (84), 23 states have call predecessors, (84), 22 states have return successors, (79), 79 states have call predecessors, (79), 79 states have call successors, (79) Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:20:31,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:31,616 INFO L93 Difference]: Finished difference Result 909 states and 1343 transitions. [2023-11-19 05:20:31,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:31,619 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2023-11-19 05:20:31,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:31,650 INFO L225 Difference]: With dead ends: 909 [2023-11-19 05:20:31,650 INFO L226 Difference]: Without dead ends: 588 [2023-11-19 05:20:31,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:31,670 INFO L413 NwaCegarLoop]: 419 mSDtfsCounter, 423 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 423 SdHoareTripleChecker+Valid, 815 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:31,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [423 Valid, 815 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:20:31,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2023-11-19 05:20:31,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 588. [2023-11-19 05:20:31,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 588 states, 400 states have (on average 1.425) internal successors, (570), 402 states have internal predecessors, (570), 146 states have call successors, (146), 42 states have call predecessors, (146), 41 states have return successors, (145), 145 states have call predecessors, (145), 145 states have call successors, (145) [2023-11-19 05:20:31,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 861 transitions. [2023-11-19 05:20:31,819 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 861 transitions. Word has length 43 [2023-11-19 05:20:31,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:31,821 INFO L495 AbstractCegarLoop]: Abstraction has 588 states and 861 transitions. [2023-11-19 05:20:31,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:20:31,821 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 861 transitions. [2023-11-19 05:20:31,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 05:20:31,829 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:31,830 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:31,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:20:31,830 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:31,831 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:31,831 INFO L85 PathProgramCache]: Analyzing trace with hash -682527219, now seen corresponding path program 1 times [2023-11-19 05:20:31,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:31,832 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078124896] [2023-11-19 05:20:31,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:31,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:31,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:32,167 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:20:32,168 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:32,168 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078124896] [2023-11-19 05:20:32,168 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1078124896] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:32,168 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:20:32,168 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:20:32,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652286869] [2023-11-19 05:20:32,169 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:32,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:32,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:32,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:32,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:32,171 INFO L87 Difference]: Start difference. First operand 588 states and 861 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-19 05:20:32,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:32,457 INFO L93 Difference]: Finished difference Result 970 states and 1417 transitions. [2023-11-19 05:20:32,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:32,457 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 43 [2023-11-19 05:20:32,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:32,467 INFO L225 Difference]: With dead ends: 970 [2023-11-19 05:20:32,468 INFO L226 Difference]: Without dead ends: 961 [2023-11-19 05:20:32,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:32,470 INFO L413 NwaCegarLoop]: 415 mSDtfsCounter, 286 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 801 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:32,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 801 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:20:32,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2023-11-19 05:20:32,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 953. [2023-11-19 05:20:32,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 953 states, 659 states have (on average 1.4446130500758725) internal successors, (952), 665 states have internal predecessors, (952), 223 states have call successors, (223), 71 states have call predecessors, (223), 70 states have return successors, (222), 218 states have call predecessors, (222), 222 states have call successors, (222) [2023-11-19 05:20:32,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 953 states to 953 states and 1397 transitions. [2023-11-19 05:20:32,534 INFO L78 Accepts]: Start accepts. Automaton has 953 states and 1397 transitions. Word has length 43 [2023-11-19 05:20:32,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:32,535 INFO L495 AbstractCegarLoop]: Abstraction has 953 states and 1397 transitions. [2023-11-19 05:20:32,535 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-19 05:20:32,535 INFO L276 IsEmpty]: Start isEmpty. Operand 953 states and 1397 transitions. [2023-11-19 05:20:32,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2023-11-19 05:20:32,539 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:32,540 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:32,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:20:32,540 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:32,540 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:32,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1831239289, now seen corresponding path program 1 times [2023-11-19 05:20:32,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:32,541 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298940651] [2023-11-19 05:20:32,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:32,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:32,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:32,846 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:20:32,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:32,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298940651] [2023-11-19 05:20:32,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298940651] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:32,847 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:20:32,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:20:32,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461426954] [2023-11-19 05:20:32,850 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:32,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:32,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:32,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:32,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:32,854 INFO L87 Difference]: Start difference. First operand 953 states and 1397 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-19 05:20:33,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:33,263 INFO L93 Difference]: Finished difference Result 2067 states and 3023 transitions. [2023-11-19 05:20:33,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:33,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 59 [2023-11-19 05:20:33,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:33,277 INFO L225 Difference]: With dead ends: 2067 [2023-11-19 05:20:33,277 INFO L226 Difference]: Without dead ends: 1128 [2023-11-19 05:20:33,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:33,285 INFO L413 NwaCegarLoop]: 412 mSDtfsCounter, 92 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 721 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:33,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 721 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:20:33,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1128 states. [2023-11-19 05:20:33,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1128 to 1119. [2023-11-19 05:20:33,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1119 states, 798 states have (on average 1.4511278195488722) internal successors, (1158), 804 states have internal predecessors, (1158), 238 states have call successors, (238), 83 states have call predecessors, (238), 82 states have return successors, (237), 233 states have call predecessors, (237), 237 states have call successors, (237) [2023-11-19 05:20:33,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1119 states to 1119 states and 1633 transitions. [2023-11-19 05:20:33,385 INFO L78 Accepts]: Start accepts. Automaton has 1119 states and 1633 transitions. Word has length 59 [2023-11-19 05:20:33,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:33,386 INFO L495 AbstractCegarLoop]: Abstraction has 1119 states and 1633 transitions. [2023-11-19 05:20:33,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2023-11-19 05:20:33,386 INFO L276 IsEmpty]: Start isEmpty. Operand 1119 states and 1633 transitions. [2023-11-19 05:20:33,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-11-19 05:20:33,390 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:33,391 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:33,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:20:33,391 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:33,392 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:33,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1406395482, now seen corresponding path program 1 times [2023-11-19 05:20:33,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:33,395 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279471229] [2023-11-19 05:20:33,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:33,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:33,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:34,380 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-19 05:20:34,380 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:34,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279471229] [2023-11-19 05:20:34,381 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279471229] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:34,381 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051166743] [2023-11-19 05:20:34,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:34,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:34,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:34,384 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:34,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:20:35,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:35,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 2512 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:20:35,098 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:35,185 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2023-11-19 05:20:35,185 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:35,186 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051166743] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:35,186 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:35,186 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-19 05:20:35,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306427394] [2023-11-19 05:20:35,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:35,188 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:20:35,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:35,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:20:35,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:20:35,190 INFO L87 Difference]: Start difference. First operand 1119 states and 1633 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 05:20:35,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:35,687 INFO L93 Difference]: Finished difference Result 2334 states and 3384 transitions. [2023-11-19 05:20:35,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:20:35,688 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 88 [2023-11-19 05:20:35,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:35,699 INFO L225 Difference]: With dead ends: 2334 [2023-11-19 05:20:35,699 INFO L226 Difference]: Without dead ends: 1231 [2023-11-19 05:20:35,702 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:20:35,704 INFO L413 NwaCegarLoop]: 766 mSDtfsCounter, 425 mSDsluCounter, 1161 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 425 SdHoareTripleChecker+Valid, 1927 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:35,706 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [425 Valid, 1927 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 273 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:20:35,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1231 states. [2023-11-19 05:20:35,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1231 to 1141. [2023-11-19 05:20:35,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1141 states, 812 states have (on average 1.4445812807881773) internal successors, (1173), 820 states have internal predecessors, (1173), 242 states have call successors, (242), 87 states have call predecessors, (242), 86 states have return successors, (241), 235 states have call predecessors, (241), 241 states have call successors, (241) [2023-11-19 05:20:35,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1141 states to 1141 states and 1656 transitions. [2023-11-19 05:20:35,784 INFO L78 Accepts]: Start accepts. Automaton has 1141 states and 1656 transitions. Word has length 88 [2023-11-19 05:20:35,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:35,786 INFO L495 AbstractCegarLoop]: Abstraction has 1141 states and 1656 transitions. [2023-11-19 05:20:35,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 05:20:35,787 INFO L276 IsEmpty]: Start isEmpty. Operand 1141 states and 1656 transitions. [2023-11-19 05:20:35,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-19 05:20:35,792 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:35,792 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:35,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:36,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:36,009 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:36,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:36,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1188692656, now seen corresponding path program 1 times [2023-11-19 05:20:36,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:36,010 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655837864] [2023-11-19 05:20:36,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:36,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:36,797 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2023-11-19 05:20:36,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:36,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655837864] [2023-11-19 05:20:36,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1655837864] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:36,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693840587] [2023-11-19 05:20:36,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:36,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:36,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:36,807 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:36,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:20:37,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:37,545 INFO L262 TraceCheckSpWp]: Trace formula consists of 2595 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:20:37,559 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:37,793 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-11-19 05:20:37,793 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:37,793 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693840587] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:37,793 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:37,793 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2023-11-19 05:20:37,794 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762759752] [2023-11-19 05:20:37,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:37,795 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:20:37,795 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:37,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:20:37,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:20:37,796 INFO L87 Difference]: Start difference. First operand 1141 states and 1656 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2023-11-19 05:20:38,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:38,577 INFO L93 Difference]: Finished difference Result 1796 states and 2621 transitions. [2023-11-19 05:20:38,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:20:38,578 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) Word has length 95 [2023-11-19 05:20:38,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:38,592 INFO L225 Difference]: With dead ends: 1796 [2023-11-19 05:20:38,593 INFO L226 Difference]: Without dead ends: 1785 [2023-11-19 05:20:38,594 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:20:38,595 INFO L413 NwaCegarLoop]: 579 mSDtfsCounter, 500 mSDsluCounter, 662 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 1241 SdHoareTripleChecker+Invalid, 448 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:38,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [565 Valid, 1241 Invalid, 448 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-19 05:20:38,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1785 states. [2023-11-19 05:20:38,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1785 to 1723. [2023-11-19 05:20:38,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1723 states, 1240 states have (on average 1.4508064516129033) internal successors, (1799), 1255 states have internal predecessors, (1799), 356 states have call successors, (356), 127 states have call predecessors, (356), 126 states have return successors, (355), 344 states have call predecessors, (355), 355 states have call successors, (355) [2023-11-19 05:20:38,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1723 states to 1723 states and 2510 transitions. [2023-11-19 05:20:38,735 INFO L78 Accepts]: Start accepts. Automaton has 1723 states and 2510 transitions. Word has length 95 [2023-11-19 05:20:38,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:38,736 INFO L495 AbstractCegarLoop]: Abstraction has 1723 states and 2510 transitions. [2023-11-19 05:20:38,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 3 states have internal predecessors, (49), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 1 states have call predecessors, (10), 1 states have call successors, (10) [2023-11-19 05:20:38,737 INFO L276 IsEmpty]: Start isEmpty. Operand 1723 states and 2510 transitions. [2023-11-19 05:20:38,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-19 05:20:38,740 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:38,741 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:38,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:38,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:38,966 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:38,966 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:38,966 INFO L85 PathProgramCache]: Analyzing trace with hash 47382655, now seen corresponding path program 1 times [2023-11-19 05:20:38,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:38,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134124241] [2023-11-19 05:20:38,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:38,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:39,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:39,553 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2023-11-19 05:20:39,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:39,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134124241] [2023-11-19 05:20:39,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134124241] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:39,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268327124] [2023-11-19 05:20:39,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:39,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:39,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:39,556 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:39,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:20:40,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:40,330 INFO L262 TraceCheckSpWp]: Trace formula consists of 2620 conjuncts, 37 conjunts are in the unsatisfiable core [2023-11-19 05:20:40,340 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:40,687 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2023-11-19 05:20:40,688 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:40,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268327124] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:40,688 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:40,688 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 8 [2023-11-19 05:20:40,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736095334] [2023-11-19 05:20:40,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:40,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:20:40,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:40,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:20:40,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:20:40,692 INFO L87 Difference]: Start difference. First operand 1723 states and 2510 transitions. Second operand has 6 states, 6 states have (on average 8.5) internal successors, (51), 5 states have internal predecessors, (51), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-19 05:20:41,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:41,746 INFO L93 Difference]: Finished difference Result 2926 states and 4307 transitions. [2023-11-19 05:20:41,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:20:41,747 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 5 states have internal predecessors, (51), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 99 [2023-11-19 05:20:41,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:41,768 INFO L225 Difference]: With dead ends: 2926 [2023-11-19 05:20:41,769 INFO L226 Difference]: Without dead ends: 2915 [2023-11-19 05:20:41,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2023-11-19 05:20:41,774 INFO L413 NwaCegarLoop]: 417 mSDtfsCounter, 310 mSDsluCounter, 1149 mSDsCounter, 0 mSdLazyCounter, 804 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 335 SdHoareTripleChecker+Valid, 1566 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:41,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [335 Valid, 1566 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 804 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-19 05:20:41,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2915 states. [2023-11-19 05:20:41,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2915 to 2173. [2023-11-19 05:20:41,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2173 states, 1576 states have (on average 1.4549492385786802) internal successors, (2293), 1594 states have internal predecessors, (2293), 438 states have call successors, (438), 159 states have call predecessors, (438), 158 states have return successors, (437), 423 states have call predecessors, (437), 437 states have call successors, (437) [2023-11-19 05:20:42,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2173 states to 2173 states and 3168 transitions. [2023-11-19 05:20:42,010 INFO L78 Accepts]: Start accepts. Automaton has 2173 states and 3168 transitions. Word has length 99 [2023-11-19 05:20:42,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:42,010 INFO L495 AbstractCegarLoop]: Abstraction has 2173 states and 3168 transitions. [2023-11-19 05:20:42,011 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 8.5) internal successors, (51), 5 states have internal predecessors, (51), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-19 05:20:42,011 INFO L276 IsEmpty]: Start isEmpty. Operand 2173 states and 3168 transitions. [2023-11-19 05:20:42,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-19 05:20:42,015 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:42,016 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:42,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:42,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:42,241 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:42,242 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:42,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1382323073, now seen corresponding path program 1 times [2023-11-19 05:20:42,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:42,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262785906] [2023-11-19 05:20:42,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:42,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:42,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:42,556 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2023-11-19 05:20:42,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:42,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262785906] [2023-11-19 05:20:42,556 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262785906] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:42,557 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:20:42,557 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:20:42,557 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711718826] [2023-11-19 05:20:42,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:42,558 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:20:42,558 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:42,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:20:42,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:42,561 INFO L87 Difference]: Start difference. First operand 2173 states and 3168 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2023-11-19 05:20:43,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:43,039 INFO L93 Difference]: Finished difference Result 5083 states and 7495 transitions. [2023-11-19 05:20:43,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:20:43,040 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 104 [2023-11-19 05:20:43,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:43,060 INFO L225 Difference]: With dead ends: 5083 [2023-11-19 05:20:43,060 INFO L226 Difference]: Without dead ends: 2932 [2023-11-19 05:20:43,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:20:43,069 INFO L413 NwaCegarLoop]: 437 mSDtfsCounter, 295 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 295 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:43,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [295 Valid, 599 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:20:43,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2932 states. [2023-11-19 05:20:43,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2932 to 2829. [2023-11-19 05:20:43,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2829 states, 2176 states have (on average 1.4255514705882353) internal successors, (3102), 2188 states have internal predecessors, (3102), 454 states have call successors, (454), 199 states have call predecessors, (454), 198 states have return successors, (453), 445 states have call predecessors, (453), 453 states have call successors, (453) [2023-11-19 05:20:43,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2829 states to 2829 states and 4009 transitions. [2023-11-19 05:20:43,319 INFO L78 Accepts]: Start accepts. Automaton has 2829 states and 4009 transitions. Word has length 104 [2023-11-19 05:20:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:43,320 INFO L495 AbstractCegarLoop]: Abstraction has 2829 states and 4009 transitions. [2023-11-19 05:20:43,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 3 states have internal predecessors, (57), 3 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2023-11-19 05:20:43,320 INFO L276 IsEmpty]: Start isEmpty. Operand 2829 states and 4009 transitions. [2023-11-19 05:20:43,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-19 05:20:43,329 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:43,330 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:43,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-11-19 05:20:43,330 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:43,330 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:43,331 INFO L85 PathProgramCache]: Analyzing trace with hash 1942530221, now seen corresponding path program 1 times [2023-11-19 05:20:43,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:43,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648488702] [2023-11-19 05:20:43,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:43,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:43,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:44,058 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2023-11-19 05:20:44,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:44,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648488702] [2023-11-19 05:20:44,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648488702] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:44,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333647069] [2023-11-19 05:20:44,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:44,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:44,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:44,063 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:44,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:20:44,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:44,680 INFO L262 TraceCheckSpWp]: Trace formula consists of 2641 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:20:44,686 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:44,709 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 05:20:44,709 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:20:44,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333647069] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:20:44,710 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:20:44,710 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 5 [2023-11-19 05:20:44,710 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708737246] [2023-11-19 05:20:44,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:20:44,711 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:20:44,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:44,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:20:44,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:20:44,712 INFO L87 Difference]: Start difference. First operand 2829 states and 4009 transitions. Second operand has 4 states, 3 states have (on average 20.333333333333332) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-19 05:20:45,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:45,119 INFO L93 Difference]: Finished difference Result 5644 states and 8002 transitions. [2023-11-19 05:20:45,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:20:45,120 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 20.333333333333332) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 104 [2023-11-19 05:20:45,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:45,137 INFO L225 Difference]: With dead ends: 5644 [2023-11-19 05:20:45,137 INFO L226 Difference]: Without dead ends: 2830 [2023-11-19 05:20:45,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:20:45,144 INFO L413 NwaCegarLoop]: 402 mSDtfsCounter, 1 mSDsluCounter, 801 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 1203 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:45,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 1203 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-19 05:20:45,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2830 states. [2023-11-19 05:20:45,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2830 to 2830. [2023-11-19 05:20:45,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2830 states, 2177 states have (on average 1.4253559944878273) internal successors, (3103), 2189 states have internal predecessors, (3103), 454 states have call successors, (454), 199 states have call predecessors, (454), 198 states have return successors, (453), 445 states have call predecessors, (453), 453 states have call successors, (453) [2023-11-19 05:20:45,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2830 states to 2830 states and 4010 transitions. [2023-11-19 05:20:45,335 INFO L78 Accepts]: Start accepts. Automaton has 2830 states and 4010 transitions. Word has length 104 [2023-11-19 05:20:45,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:45,336 INFO L495 AbstractCegarLoop]: Abstraction has 2830 states and 4010 transitions. [2023-11-19 05:20:45,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 20.333333333333332) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-19 05:20:45,336 INFO L276 IsEmpty]: Start isEmpty. Operand 2830 states and 4010 transitions. [2023-11-19 05:20:45,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-19 05:20:45,343 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:45,343 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:45,373 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:45,568 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:45,568 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:45,569 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:45,569 INFO L85 PathProgramCache]: Analyzing trace with hash 728942231, now seen corresponding path program 1 times [2023-11-19 05:20:45,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:45,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364417221] [2023-11-19 05:20:45,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:45,569 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:45,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:46,317 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2023-11-19 05:20:46,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:46,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364417221] [2023-11-19 05:20:46,319 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364417221] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:46,319 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997650641] [2023-11-19 05:20:46,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:46,319 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:46,320 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:46,323 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:46,353 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_671bdef3-267c-4f84-b7ff-4b817809b2ef/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:20:46,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:46,975 INFO L262 TraceCheckSpWp]: Trace formula consists of 2671 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:20:46,981 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:47,006 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-11-19 05:20:47,006 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:47,098 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2023-11-19 05:20:47,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997650641] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:20:47,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [711063512] [2023-11-19 05:20:47,126 INFO L159 IcfgInterpreter]: Started Sifa with 71 locations of interest [2023-11-19 05:20:47,126 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:20:47,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:20:47,135 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:20:47,136 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs