./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --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 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:43:26,037 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:43:26,040 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:43:26,090 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:43:26,091 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:43:26,095 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:43:26,097 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:43:26,102 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:43:26,105 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:43:26,111 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:43:26,113 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:43:26,115 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:43:26,115 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:43:26,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:43:26,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:43:26,127 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:43:26,129 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:43:26,130 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:43:26,133 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:43:26,143 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:43:26,145 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:43:26,146 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:43:26,150 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:43:26,151 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:43:26,160 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:43:26,161 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:43:26,161 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:43:26,164 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:43:26,164 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:43:26,166 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:43:26,167 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:43:26,169 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:43:26,171 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:43:26,173 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:43:26,174 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:43:26,175 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:43:26,176 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:43:26,176 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:43:26,177 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:43:26,178 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:43:26,179 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:43:26,180 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-12 23:43:26,227 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:43:26,228 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:43:26,230 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:43:26,230 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:43:26,231 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:43:26,231 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:43:26,231 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:43:26,232 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:43:26,232 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:43:26,232 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:43:26,234 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:43:26,234 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:43:26,234 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:43:26,235 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:43:26,235 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:43:26,236 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:43:26,237 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:43:26,237 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:43:26,237 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:43:26,237 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:43:26,238 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:43:26,238 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:43:26,238 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:43:26,239 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:43:26,239 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:43:26,239 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:43:26,240 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:43:26,240 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:43:26,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:43:26,242 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:43:26,243 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:43:26,243 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:43:26,243 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:43:26,244 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:43:26,244 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:43:26,244 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:43:26,245 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:43:26,245 INFO L138 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb [2021-11-12 23:43:26,547 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:43:26,587 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:43:26,591 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:43:26,592 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:43:26,593 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:43:26,595 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:43:26,696 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/279d23a8b/d527d1300fee4c518397c8a8cfde1032/FLAG5e092926e [2021-11-12 23:43:27,494 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:43:27,495 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:43:27,538 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/279d23a8b/d527d1300fee4c518397c8a8cfde1032/FLAG5e092926e [2021-11-12 23:43:27,588 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/279d23a8b/d527d1300fee4c518397c8a8cfde1032 [2021-11-12 23:43:27,593 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:43:27,596 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:43:27,599 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:27,599 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:43:27,603 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:43:27,604 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:27" (1/1) ... [2021-11-12 23:43:27,607 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e57fa5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:27, skipping insertion in model container [2021-11-12 23:43:27,607 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:27" (1/1) ... [2021-11-12 23:43:27,641 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:43:27,753 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:43:28,707 WARN L228 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-12 23:43:28,725 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:28,769 ERROR L326 MainTranslator]: Unsupported Syntax: Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) [2021-11-12 23:43:28,770 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@464f933a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:28, skipping insertion in model container [2021-11-12 23:43:28,770 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:28,770 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-12 23:43:28,772 INFO L158 Benchmark]: Toolchain (without parser) took 1175.50ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 43.4MB in the beginning and 83.8MB in the end (delta: -40.4MB). Peak memory consumption was 21.6MB. Max. memory is 16.1GB. [2021-11-12 23:43:28,773 INFO L158 Benchmark]: CDTParser took 0.37ms. Allocated memory is still 86.0MB. Free memory is still 47.0MB. There was no memory consumed. Max. memory is 16.1GB. [2021-11-12 23:43:28,774 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1171.06ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 43.2MB in the beginning and 83.8MB in the end (delta: -40.6MB). Peak memory consumption was 21.6MB. Max. memory is 16.1GB. [2021-11-12 23:43:28,776 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37ms. Allocated memory is still 86.0MB. Free memory is still 47.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1171.06ms. Allocated memory was 86.0MB in the beginning and 119.5MB in the end (delta: 33.6MB). Free memory was 43.2MB in the beginning and 83.8MB in the end (delta: -40.6MB). Peak memory consumption was 21.6MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 3619]: Unsupported Syntax Found a cast between two array/pointer types where the value type is smaller than the cast-to type while using memory model HoenickeLindenmann_Original (while Not using bitvector translation) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF --witnessprinter.witness.filename witness.graphml --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 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:43:31,071 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:43:31,075 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:43:31,129 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:43:31,130 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:43:31,135 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:43:31,137 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:43:31,142 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:43:31,145 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:43:31,153 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:43:31,155 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:43:31,157 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:43:31,158 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:43:31,161 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:43:31,163 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:43:31,170 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:43:31,172 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:43:31,173 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:43:31,176 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:43:31,187 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:43:31,189 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:43:31,191 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:43:31,194 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:43:31,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:43:31,207 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:43:31,207 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:43:31,208 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:43:31,210 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:43:31,211 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:43:31,212 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:43:31,213 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:43:31,214 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:43:31,216 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:43:31,217 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:43:31,219 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:43:31,219 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:43:31,220 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:43:31,221 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:43:31,221 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:43:31,223 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:43:31,224 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:43:31,226 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-12 23:43:31,271 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:43:31,272 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:43:31,274 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:43:31,274 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:43:31,274 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:43:31,274 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:43:31,275 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:43:31,275 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:43:31,275 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:43:31,275 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:43:31,278 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:43:31,278 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:43:31,279 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:43:31,279 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:43:31,279 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:43:31,279 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:43:31,280 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-12 23:43:31,280 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-12 23:43:31,280 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:43:31,280 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:43:31,281 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:43:31,281 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:43:31,281 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-12 23:43:31,281 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:43:31,282 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:43:31,282 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:43:31,282 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:43:31,282 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:43:31,283 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-12 23:43:31,283 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-12 23:43:31,283 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:43:31,283 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:43:31,284 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:43:31,284 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb [2021-11-12 23:43:31,692 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:43:31,722 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:43:31,726 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:43:31,727 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:43:31,728 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:43:31,729 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:43:31,805 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/5b3a37adf/d4c9b7798ff0418f99db957c9518b0ac/FLAGc60e1e9df [2021-11-12 23:43:32,652 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:43:32,653 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:43:32,697 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/5b3a37adf/d4c9b7798ff0418f99db957c9518b0ac/FLAGc60e1e9df [2021-11-12 23:43:32,726 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/data/5b3a37adf/d4c9b7798ff0418f99db957c9518b0ac [2021-11-12 23:43:32,730 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:43:32,733 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:43:32,737 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:32,737 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:43:32,741 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:43:32,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:32" (1/1) ... [2021-11-12 23:43:32,743 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@38007a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:32, skipping insertion in model container [2021-11-12 23:43:32,744 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:43:32" (1/1) ... [2021-11-12 23:43:32,753 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:43:32,873 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:43:34,008 WARN L228 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-12 23:43:34,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:34,113 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-12 23:43:34,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:43:34,455 WARN L228 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-12 23:43:34,460 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:34,502 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:43:34,787 WARN L228 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_d6663a26-2c98-42b8-b626-6bcb23cb2caf/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-12 23:43:34,792 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:43:34,857 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:43:34,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34 WrapperNode [2021-11-12 23:43:34,858 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:43:34,859 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:43:34,859 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:43:34,859 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:43:34,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:34,947 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,054 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:43:35,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:43:35,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:43:35,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:43:35,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,105 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,110 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,251 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,279 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,308 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,337 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:43:35,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:43:35,343 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:43:35,343 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:43:35,345 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (1/1) ... [2021-11-12 23:43:35,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:43:35,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:43:35,383 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:43:35,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:43:35,441 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-12 23:43:35,441 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2021-11-12 23:43:35,441 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2021-11-12 23:43:35,442 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-12 23:43:35,448 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-12 23:43:35,448 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-12 23:43:35,449 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE2 [2021-11-12 23:43:35,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-12 23:43:35,450 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-12 23:43:35,450 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-12 23:43:35,450 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-12 23:43:35,450 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-12 23:43:35,451 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_xfer_int [2021-11-12 23:43:35,451 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_xfer_int [2021-11-12 23:43:35,451 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2021-11-12 23:43:35,452 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2021-11-12 23:43:35,452 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-12 23:43:35,452 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-12 23:43:35,452 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-12 23:43:35,453 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-12 23:43:35,453 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2021-11-12 23:43:35,453 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2021-11-12 23:43:35,453 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-12 23:43:35,453 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-12 23:43:35,453 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_serial_port_data [2021-11-12 23:43:35,453 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_serial_port_data [2021-11-12 23:43:35,453 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_tty [2021-11-12 23:43:35,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_tty [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-12 23:43:35,454 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-12 23:43:35,454 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-12 23:43:35,454 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-12 23:43:35,455 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_detach_1 [2021-11-12 23:43:35,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_detach_1 [2021-11-12 23:43:35,455 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-12 23:43:35,455 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-12 23:43:35,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-12 23:43:35,455 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmset [2021-11-12 23:43:35,455 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmset [2021-11-12 23:43:35,455 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmget [2021-11-12 23:43:35,456 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmget [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE8 [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE2 [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-12 23:43:35,456 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-12 23:43:35,457 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_ioctl [2021-11-12 23:43:35,457 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_ioctl [2021-11-12 23:43:35,457 INFO L130 BoogieDeclarations]: Found specification of procedure usb_control_msg [2021-11-12 23:43:35,457 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_control_msg [2021-11-12 23:43:35,457 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2021-11-12 23:43:35,457 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2021-11-12 23:43:35,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_write_room [2021-11-12 23:43:35,458 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_write_room [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-12 23:43:35,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE2 [2021-11-12 23:43:35,459 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-12 23:43:35,459 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-12 23:43:35,459 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE8 [2021-11-12 23:43:35,459 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_init_termios [2021-11-12 23:43:35,459 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_init_termios [2021-11-12 23:43:35,459 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_deregister [2021-11-12 23:43:35,459 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_deregister [2021-11-12 23:43:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-11-12 23:43:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-11-12 23:43:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2021-11-12 23:43:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2021-11-12 23:43:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-12 23:43:35,460 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_set_termios [2021-11-12 23:43:35,460 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_set_termios [2021-11-12 23:43:35,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:43:35,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:43:36,281 INFO L766 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-12 23:43:57,458 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:43:57,459 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-12 23:43:57,462 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:43:57 BoogieIcfgContainer [2021-11-12 23:43:57,463 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:43:57,465 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:43:57,465 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:43:57,468 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:43:57,468 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:43:32" (1/3) ... [2021-11-12 23:43:57,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@199bd9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:43:57, skipping insertion in model container [2021-11-12 23:43:57,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:43:34" (2/3) ... [2021-11-12 23:43:57,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@199bd9a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:43:57, skipping insertion in model container [2021-11-12 23:43:57,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:43:57" (3/3) ... [2021-11-12 23:43:57,472 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-12 23:43:57,477 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:43:57,478 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:43:57,532 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:43:57,539 INFO L339 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=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 23:43:57,540 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:43:57,572 INFO L276 IsEmpty]: Start isEmpty. Operand has 587 states, 446 states have (on average 1.4103139013452914) internal successors, (629), 453 states have internal predecessors, (629), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) [2021-11-12 23:43:57,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-12 23:43:57,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:43:57,592 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:43:57,593 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:43:57,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:43:57,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1370803934, now seen corresponding path program 1 times [2021-11-12 23:43:57,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:43:57,617 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1206611753] [2021-11-12 23:43:57,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:43:57,618 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:43:57,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:43:57,621 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:43:57,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-12 23:43:59,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:43:59,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 1264 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-12 23:43:59,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:00,686 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:44:00,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:01,444 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-12 23:44:01,444 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:44:01,445 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1206611753] [2021-11-12 23:44:01,445 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1206611753] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:01,445 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:01,447 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [2] total 2 [2021-11-12 23:44:01,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338138760] [2021-11-12 23:44:01,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:01,455 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-12 23:44:01,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:44:01,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-12 23:44:01,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 23:44:01,506 INFO L87 Difference]: Start difference. First operand has 587 states, 446 states have (on average 1.4103139013452914) internal successors, (629), 453 states have internal predecessors, (629), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) Second operand has 2 states, 2 states have (on average 30.5) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:44:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:01,631 INFO L93 Difference]: Finished difference Result 1170 states and 1751 transitions. [2021-11-12 23:44:01,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-12 23:44:01,633 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 30.5) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 128 [2021-11-12 23:44:01,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:01,653 INFO L225 Difference]: With dead ends: 1170 [2021-11-12 23:44:01,654 INFO L226 Difference]: Without dead ends: 571 [2021-11-12 23:44:01,663 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 254 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-12 23:44:01,667 INFO L933 BasicCegarLoop]: 849 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.00ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.54ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:01,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 849 Invalid, 0 Unknown, 0 Unchecked, 11.54ms Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.00ms Time] [2021-11-12 23:44:01,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-11-12 23:44:01,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 571. [2021-11-12 23:44:01,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 571 states, 437 states have (on average 1.3981693363844394) internal successors, (611), 438 states have internal predecessors, (611), 108 states have call successors, (108), 25 states have call predecessors, (108), 25 states have return successors, (108), 108 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-12 23:44:01,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 827 transitions. [2021-11-12 23:44:01,851 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 827 transitions. Word has length 128 [2021-11-12 23:44:01,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:01,851 INFO L470 AbstractCegarLoop]: Abstraction has 571 states and 827 transitions. [2021-11-12 23:44:01,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 30.5) internal successors, (61), 2 states have internal predecessors, (61), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:44:01,852 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 827 transitions. [2021-11-12 23:44:01,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-12 23:44:01,862 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:01,863 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:44:01,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:02,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:44:02,079 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:02,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:02,081 INFO L85 PathProgramCache]: Analyzing trace with hash 948643174, now seen corresponding path program 1 times [2021-11-12 23:44:02,085 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:44:02,086 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [864192353] [2021-11-12 23:44:02,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:02,086 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:44:02,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:44:02,088 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:44:02,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-12 23:44:03,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:03,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 1264 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:44:03,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:05,432 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-12 23:44:05,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:07,397 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2021-11-12 23:44:07,397 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:44:07,397 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [864192353] [2021-11-12 23:44:07,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [864192353] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:07,398 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:07,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 11 [2021-11-12 23:44:07,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149656736] [2021-11-12 23:44:07,399 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:07,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-12 23:44:07,400 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:44:07,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-12 23:44:07,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:44:07,402 INFO L87 Difference]: Start difference. First operand 571 states and 827 transitions. Second operand has 7 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 3 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:44:08,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:08,127 INFO L93 Difference]: Finished difference Result 1139 states and 1655 transitions. [2021-11-12 23:44:08,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:44:08,128 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 3 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) Word has length 128 [2021-11-12 23:44:08,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:08,143 INFO L225 Difference]: With dead ends: 1139 [2021-11-12 23:44:08,143 INFO L226 Difference]: Without dead ends: 573 [2021-11-12 23:44:08,146 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:44:08,157 INFO L933 BasicCegarLoop]: 822 mSDtfsCounter, 2 mSDsluCounter, 4095 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 430.02ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 4917 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 37.89ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 454.93ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:08,158 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 4917 Invalid, 39 Unknown, 0 Unchecked, 37.89ms Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 454.93ms Time] [2021-11-12 23:44:08,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-11-12 23:44:08,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 573. [2021-11-12 23:44:08,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 573 states, 438 states have (on average 1.3972602739726028) internal successors, (612), 440 states have internal predecessors, (612), 108 states have call successors, (108), 25 states have call predecessors, (108), 26 states have return successors, (114), 108 states have call predecessors, (114), 108 states have call successors, (114) [2021-11-12 23:44:08,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 573 states to 573 states and 834 transitions. [2021-11-12 23:44:08,219 INFO L78 Accepts]: Start accepts. Automaton has 573 states and 834 transitions. Word has length 128 [2021-11-12 23:44:08,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:08,222 INFO L470 AbstractCegarLoop]: Abstraction has 573 states and 834 transitions. [2021-11-12 23:44:08,223 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 10.5) internal successors, (63), 6 states have internal predecessors, (63), 3 states have call successors, (17), 2 states have call predecessors, (17), 4 states have return successors, (16), 3 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-12 23:44:08,223 INFO L276 IsEmpty]: Start isEmpty. Operand 573 states and 834 transitions. [2021-11-12 23:44:08,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-12 23:44:08,236 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:08,237 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:44:08,276 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:08,451 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:44:08,452 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:08,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:08,452 INFO L85 PathProgramCache]: Analyzing trace with hash 1579561543, now seen corresponding path program 1 times [2021-11-12 23:44:08,455 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:44:08,456 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [828519840] [2021-11-12 23:44:08,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:44:08,456 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:44:08,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:44:08,457 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:44:08,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-12 23:44:09,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:44:09,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 1279 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-12 23:44:09,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:44:11,169 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2021-11-12 23:44:11,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:44:12,389 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2021-11-12 23:44:12,390 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:44:12,390 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [828519840] [2021-11-12 23:44:12,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [828519840] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:44:12,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:44:12,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-12 23:44:12,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281548204] [2021-11-12 23:44:12,391 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:44:12,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:44:12,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:44:12,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:44:12,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:44:12,393 INFO L87 Difference]: Start difference. First operand 573 states and 834 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-12 23:44:12,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:44:12,975 INFO L93 Difference]: Finished difference Result 1155 states and 1669 transitions. [2021-11-12 23:44:12,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-12 23:44:12,977 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) Word has length 134 [2021-11-12 23:44:12,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:44:12,982 INFO L225 Difference]: With dead ends: 1155 [2021-11-12 23:44:12,982 INFO L226 Difference]: Without dead ends: 593 [2021-11-12 23:44:12,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 261 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:44:12,986 INFO L933 BasicCegarLoop]: 829 mSDtfsCounter, 39 mSDsluCounter, 2458 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 250.01ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 3287 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.03ms SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 256.12ms IncrementalHoareTripleChecker+Time [2021-11-12 23:44:12,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 3287 Invalid, 11 Unknown, 0 Unchecked, 10.03ms Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 256.12ms Time] [2021-11-12 23:44:12,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-11-12 23:44:13,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 591. [2021-11-12 23:44:13,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 591 states, 450 states have (on average 1.3866666666666667) internal successors, (624), 451 states have internal predecessors, (624), 111 states have call successors, (111), 29 states have call predecessors, (111), 29 states have return successors, (111), 111 states have call predecessors, (111), 111 states have call successors, (111) [2021-11-12 23:44:13,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 591 states to 591 states and 846 transitions. [2021-11-12 23:44:13,015 INFO L78 Accepts]: Start accepts. Automaton has 591 states and 846 transitions. Word has length 134 [2021-11-12 23:44:13,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:44:13,015 INFO L470 AbstractCegarLoop]: Abstraction has 591 states and 846 transitions. [2021-11-12 23:44:13,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-12 23:44:13,016 INFO L276 IsEmpty]: Start isEmpty. Operand 591 states and 846 transitions. [2021-11-12 23:44:13,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-12 23:44:13,019 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:44:13,019 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:44:13,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:44:13,220 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:44:13,221 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:44:13,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:44:13,221 INFO L85 PathProgramCache]: Analyzing trace with hash -356464088, now seen corresponding path program 2 times [2021-11-12 23:44:13,223 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:44:13,223 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1445665836] [2021-11-12 23:44:13,223 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 23:44:13,223 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:44:13,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:44:13,224 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:44:13,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-12 23:46:04,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 23:46:04,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:46:04,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 1294 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:46:04,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:05,729 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-11-12 23:46:05,729 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:06,672 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2021-11-12 23:46:06,673 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:06,673 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1445665836] [2021-11-12 23:46:06,673 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1445665836] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:46:06,673 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:46:06,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-12 23:46:06,674 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24952982] [2021-11-12 23:46:06,674 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:06,676 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:46:06,676 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:06,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:46:06,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:46:06,677 INFO L87 Difference]: Start difference. First operand 591 states and 846 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-12 23:46:06,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:46:06,964 INFO L93 Difference]: Finished difference Result 1149 states and 1658 transitions. [2021-11-12 23:46:06,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:46:06,965 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 140 [2021-11-12 23:46:06,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:46:06,971 INFO L225 Difference]: With dead ends: 1149 [2021-11-12 23:46:06,971 INFO L226 Difference]: Without dead ends: 592 [2021-11-12 23:46:06,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:46:06,975 INFO L933 BasicCegarLoop]: 825 mSDtfsCounter, 3 mSDsluCounter, 1639 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 152.53ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 2464 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.20ms SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 166.84ms IncrementalHoareTripleChecker+Time [2021-11-12 23:46:06,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 2464 Invalid, 20 Unknown, 0 Unchecked, 7.20ms Time], IncrementalHoareTripleChecker [4 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 166.84ms Time] [2021-11-12 23:46:06,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-11-12 23:46:06,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 592. [2021-11-12 23:46:06,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 592 states, 451 states have (on average 1.3858093126385809) internal successors, (625), 452 states have internal predecessors, (625), 111 states have call successors, (111), 29 states have call predecessors, (111), 29 states have return successors, (111), 111 states have call predecessors, (111), 111 states have call successors, (111) [2021-11-12 23:46:07,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 592 states to 592 states and 847 transitions. [2021-11-12 23:46:07,005 INFO L78 Accepts]: Start accepts. Automaton has 592 states and 847 transitions. Word has length 140 [2021-11-12 23:46:07,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:46:07,006 INFO L470 AbstractCegarLoop]: Abstraction has 592 states and 847 transitions. [2021-11-12 23:46:07,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (16), 2 states have call predecessors, (16), 3 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-12 23:46:07,006 INFO L276 IsEmpty]: Start isEmpty. Operand 592 states and 847 transitions. [2021-11-12 23:46:07,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 23:46:07,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:46:07,009 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-12 23:46:07,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:07,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:46:07,217 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:46:07,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:46:07,218 INFO L85 PathProgramCache]: Analyzing trace with hash 2069020180, now seen corresponding path program 1 times [2021-11-12 23:46:07,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:46:07,219 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [264953666] [2021-11-12 23:46:07,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:07,219 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:46:07,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:46:07,221 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:46:07,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-12 23:46:08,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:08,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:46:08,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:09,592 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 40 proven. 1 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-12 23:46:09,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:10,848 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2021-11-12 23:46:10,848 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:10,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [264953666] [2021-11-12 23:46:10,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [264953666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:46:10,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1876628839] [2021-11-12 23:46:10,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:10,849 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:10,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:46:10,851 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:46:10,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-12 23:46:11,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:11,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:46:11,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-11-12 23:46:12,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:12,857 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-12 23:46:12,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1876628839] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:46:12,857 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:46:12,857 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:46:12,857 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842200442] [2021-11-12 23:46:12,858 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:12,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:46:12,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:12,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:46:12,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:46:12,859 INFO L87 Difference]: Start difference. First operand 592 states and 847 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:46:13,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:46:13,981 INFO L93 Difference]: Finished difference Result 1187 states and 1704 transitions. [2021-11-12 23:46:13,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:46:13,982 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 145 [2021-11-12 23:46:13,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:46:13,999 INFO L225 Difference]: With dead ends: 1187 [2021-11-12 23:46:13,999 INFO L226 Difference]: Without dead ends: 647 [2021-11-12 23:46:14,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 569 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:46:14,011 INFO L933 BasicCegarLoop]: 831 mSDtfsCounter, 114 mSDsluCounter, 683 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 994.60ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 1514 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.32ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1077.85ms IncrementalHoareTripleChecker+Time [2021-11-12 23:46:14,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 1514 Invalid, 104 Unknown, 0 Unchecked, 5.32ms Time], IncrementalHoareTripleChecker [2 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 1077.85ms Time] [2021-11-12 23:46:14,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-11-12 23:46:14,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 647. [2021-11-12 23:46:14,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 647 states, 498 states have (on average 1.3815261044176708) internal successors, (688), 500 states have internal predecessors, (688), 115 states have call successors, (115), 33 states have call predecessors, (115), 33 states have return successors, (115), 115 states have call predecessors, (115), 115 states have call successors, (115) [2021-11-12 23:46:14,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 918 transitions. [2021-11-12 23:46:14,048 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 918 transitions. Word has length 145 [2021-11-12 23:46:14,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:46:14,049 INFO L470 AbstractCegarLoop]: Abstraction has 647 states and 918 transitions. [2021-11-12 23:46:14,049 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2021-11-12 23:46:14,049 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 918 transitions. [2021-11-12 23:46:14,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-12 23:46:14,054 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:46:14,054 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:46:14,085 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:14,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:14,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:14,455 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:46:14,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:46:14,456 INFO L85 PathProgramCache]: Analyzing trace with hash -472609456, now seen corresponding path program 1 times [2021-11-12 23:46:14,458 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:46:14,458 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1491072665] [2021-11-12 23:46:14,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:14,459 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:46:14,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:46:14,460 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:46:14,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2021-11-12 23:46:15,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:15,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:46:15,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:17,381 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 210 proven. 1 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-12 23:46:17,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:18,931 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-12 23:46:18,931 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:18,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1491072665] [2021-11-12 23:46:18,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1491072665] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:46:18,932 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1213558488] [2021-11-12 23:46:18,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:18,932 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:18,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:46:18,952 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:46:18,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2021-11-12 23:46:19,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:19,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:46:19,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:23,353 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 395 trivial. 0 not checked. [2021-11-12 23:46:23,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:24,750 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 407 trivial. 0 not checked. [2021-11-12 23:46:24,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1213558488] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:46:24,750 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:46:24,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:46:24,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553300128] [2021-11-12 23:46:24,751 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:24,752 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:46:24,752 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:24,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:46:24,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:46:24,753 INFO L87 Difference]: Start difference. First operand 647 states and 918 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-12 23:46:25,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:46:25,136 INFO L93 Difference]: Finished difference Result 1242 states and 1786 transitions. [2021-11-12 23:46:25,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:46:25,137 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) Word has length 213 [2021-11-12 23:46:25,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:46:25,143 INFO L225 Difference]: With dead ends: 1242 [2021-11-12 23:46:25,143 INFO L226 Difference]: Without dead ends: 647 [2021-11-12 23:46:25,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 841 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:46:25,148 INFO L933 BasicCegarLoop]: 770 mSDtfsCounter, 705 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 308.33ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 705 SdHoareTripleChecker+Valid, 770 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.11ms SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 337.60ms IncrementalHoareTripleChecker+Time [2021-11-12 23:46:25,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [705 Valid, 770 Invalid, 56 Unknown, 0 Unchecked, 4.11ms Time], IncrementalHoareTripleChecker [27 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 337.60ms Time] [2021-11-12 23:46:25,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-11-12 23:46:25,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 647. [2021-11-12 23:46:25,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 647 states, 498 states have (on average 1.3253012048192772) internal successors, (660), 500 states have internal predecessors, (660), 115 states have call successors, (115), 33 states have call predecessors, (115), 33 states have return successors, (115), 115 states have call predecessors, (115), 115 states have call successors, (115) [2021-11-12 23:46:25,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 647 states to 647 states and 890 transitions. [2021-11-12 23:46:25,189 INFO L78 Accepts]: Start accepts. Automaton has 647 states and 890 transitions. Word has length 213 [2021-11-12 23:46:25,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:46:25,190 INFO L470 AbstractCegarLoop]: Abstraction has 647 states and 890 transitions. [2021-11-12 23:46:25,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (39), 3 states have call predecessors, (39), 3 states have return successors, (38), 3 states have call predecessors, (38), 3 states have call successors, (38) [2021-11-12 23:46:25,191 INFO L276 IsEmpty]: Start isEmpty. Operand 647 states and 890 transitions. [2021-11-12 23:46:25,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2021-11-12 23:46:25,196 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:46:25,196 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:46:25,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:25,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:25,619 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:25,619 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:46:25,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:46:25,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1493677810, now seen corresponding path program 1 times [2021-11-12 23:46:25,622 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:46:25,622 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1216997120] [2021-11-12 23:46:25,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:25,622 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:46:25,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:46:25,625 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:46:25,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-12 23:46:27,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:27,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:46:27,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:28,616 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 210 proven. 1 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-11-12 23:46:28,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:30,090 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-11-12 23:46:30,090 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:30,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1216997120] [2021-11-12 23:46:30,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1216997120] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:46:30,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1867871463] [2021-11-12 23:46:30,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:30,091 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:30,091 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:46:30,092 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:46:30,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-12 23:46:31,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:31,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-12 23:46:31,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:32,352 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 180 proven. 0 refuted. 0 times theorem prover too weak. 227 trivial. 0 not checked. [2021-11-12 23:46:32,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:32,941 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2021-11-12 23:46:32,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1867871463] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:46:32,941 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:46:32,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-12 23:46:32,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762776181] [2021-11-12 23:46:32,941 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:32,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-12 23:46:32,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:32,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-12 23:46:32,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:46:32,943 INFO L87 Difference]: Start difference. First operand 647 states and 890 transitions. Second operand has 5 states, 5 states have (on average 16.2) internal successors, (81), 5 states have internal predecessors, (81), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 23:46:35,053 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:46:35,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:46:35,796 INFO L93 Difference]: Finished difference Result 1830 states and 2533 transitions. [2021-11-12 23:46:35,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:46:35,798 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 5 states have internal predecessors, (81), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 213 [2021-11-12 23:46:35,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:46:35,808 INFO L225 Difference]: With dead ends: 1830 [2021-11-12 23:46:35,809 INFO L226 Difference]: Without dead ends: 1209 [2021-11-12 23:46:35,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 851 GetRequests, 839 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:46:35,813 INFO L933 BasicCegarLoop]: 1535 mSDtfsCounter, 742 mSDsluCounter, 3846 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2329.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 743 SdHoareTripleChecker+Valid, 5381 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.30ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2387.99ms IncrementalHoareTripleChecker+Time [2021-11-12 23:46:35,814 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [743 Valid, 5381 Invalid, 33 Unknown, 0 Unchecked, 17.30ms Time], IncrementalHoareTripleChecker [5 Valid, 27 Invalid, 1 Unknown, 0 Unchecked, 2387.99ms Time] [2021-11-12 23:46:35,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2021-11-12 23:46:35,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1153. [2021-11-12 23:46:35,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1153 states, 893 states have (on average 1.335946248600224) internal successors, (1193), 894 states have internal predecessors, (1193), 205 states have call successors, (205), 54 states have call predecessors, (205), 54 states have return successors, (205), 204 states have call predecessors, (205), 205 states have call successors, (205) [2021-11-12 23:46:35,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1153 states to 1153 states and 1603 transitions. [2021-11-12 23:46:35,884 INFO L78 Accepts]: Start accepts. Automaton has 1153 states and 1603 transitions. Word has length 213 [2021-11-12 23:46:35,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:46:35,888 INFO L470 AbstractCegarLoop]: Abstraction has 1153 states and 1603 transitions. [2021-11-12 23:46:35,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 5 states have internal predecessors, (81), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-12 23:46:35,889 INFO L276 IsEmpty]: Start isEmpty. Operand 1153 states and 1603 transitions. [2021-11-12 23:46:35,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-11-12 23:46:35,899 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:46:35,900 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:46:35,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:36,136 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:36,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:46:36,308 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:46:36,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:46:36,309 INFO L85 PathProgramCache]: Analyzing trace with hash 2102075625, now seen corresponding path program 1 times [2021-11-12 23:46:36,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:46:36,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [906779817] [2021-11-12 23:46:36,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:36,310 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:46:36,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:46:36,311 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:46:36,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2021-11-12 23:46:37,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:37,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 1572 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:46:37,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:39,571 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 264 proven. 1 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2021-11-12 23:46:39,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:41,196 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2021-11-12 23:46:41,197 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:41,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [906779817] [2021-11-12 23:46:41,197 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [906779817] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:46:41,197 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1268335786] [2021-11-12 23:46:41,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:41,198 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:41,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:46:41,211 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:46:41,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Waiting until timeout for monitored process [2021-11-12 23:46:42,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:42,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 1572 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:46:42,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:43,656 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 226 proven. 0 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2021-11-12 23:46:43,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:44,530 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 501 trivial. 0 not checked. [2021-11-12 23:46:44,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1268335786] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:46:44,531 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:46:44,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:46:44,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364080865] [2021-11-12 23:46:44,531 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:44,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:46:44,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:44,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:46:44,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:46:44,533 INFO L87 Difference]: Start difference. First operand 1153 states and 1603 transitions. Second operand has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 4 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 4 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-12 23:46:46,668 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:46:50,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:46:50,692 INFO L93 Difference]: Finished difference Result 3250 states and 4556 transitions. [2021-11-12 23:46:50,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:46:50,693 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 4 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 4 states have call predecessors, (27), 4 states have call successors, (27) Word has length 233 [2021-11-12 23:46:50,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:46:50,709 INFO L225 Difference]: With dead ends: 3250 [2021-11-12 23:46:50,709 INFO L226 Difference]: Without dead ends: 2149 [2021-11-12 23:46:50,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 928 GetRequests, 920 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:46:50,715 INFO L933 BasicCegarLoop]: 871 mSDtfsCounter, 1061 mSDsluCounter, 806 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 190 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5730.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1061 SdHoareTripleChecker+Valid, 1677 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.51ms SdHoareTripleChecker+Time, 190 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6017.35ms IncrementalHoareTripleChecker+Time [2021-11-12 23:46:50,715 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1061 Valid, 1677 Invalid, 518 Unknown, 0 Unchecked, 10.51ms Time], IncrementalHoareTripleChecker [190 Valid, 327 Invalid, 1 Unknown, 0 Unchecked, 6017.35ms Time] [2021-11-12 23:46:50,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2149 states. [2021-11-12 23:46:50,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2149 to 2145. [2021-11-12 23:46:50,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2145 states, 1695 states have (on average 1.3469026548672567) internal successors, (2283), 1698 states have internal predecessors, (2283), 321 states have call successors, (321), 128 states have call predecessors, (321), 128 states have return successors, (321), 318 states have call predecessors, (321), 321 states have call successors, (321) [2021-11-12 23:46:50,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2145 states to 2145 states and 2925 transitions. [2021-11-12 23:46:50,814 INFO L78 Accepts]: Start accepts. Automaton has 2145 states and 2925 transitions. Word has length 233 [2021-11-12 23:46:50,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:46:50,815 INFO L470 AbstractCegarLoop]: Abstraction has 2145 states and 2925 transitions. [2021-11-12 23:46:50,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.5) internal successors, (102), 4 states have internal predecessors, (102), 4 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (27), 4 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-12 23:46:50,815 INFO L276 IsEmpty]: Start isEmpty. Operand 2145 states and 2925 transitions. [2021-11-12 23:46:50,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-12 23:46:50,820 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:46:50,820 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:46:50,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:46:51,041 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (13)] Ended with exit code 0 [2021-11-12 23:46:51,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:51,235 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:46:51,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:46:51,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1298576782, now seen corresponding path program 1 times [2021-11-12 23:46:51,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:46:51,237 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1036614064] [2021-11-12 23:46:51,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:51,237 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:46:51,237 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:46:51,238 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:46:51,240 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Waiting until timeout for monitored process [2021-11-12 23:46:52,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:52,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 1592 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:46:52,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:54,469 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 264 proven. 1 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2021-11-12 23:46:54,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:56,153 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2021-11-12 23:46:56,153 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:46:56,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1036614064] [2021-11-12 23:46:56,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1036614064] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:46:56,154 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [564616005] [2021-11-12 23:46:56,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:46:56,155 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:46:56,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:46:56,158 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:46:56,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Waiting until timeout for monitored process [2021-11-12 23:46:57,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:46:57,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 1592 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:46:57,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:46:57,806 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-12 23:46:57,806 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:46:58,376 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-12 23:46:58,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [564616005] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:46:58,377 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:46:58,378 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:46:58,378 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693705554] [2021-11-12 23:46:58,378 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:46:58,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:46:58,380 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:46:58,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:46:58,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:46:58,382 INFO L87 Difference]: Start difference. First operand 2145 states and 2925 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 2 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 1 states have call predecessors, (21), 1 states have call successors, (21) [2021-11-12 23:47:00,515 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.09s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:47:00,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:47:00,670 INFO L93 Difference]: Finished difference Result 4244 states and 5808 transitions. [2021-11-12 23:47:00,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:47:00,671 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 2 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 1 states have call predecessors, (21), 1 states have call successors, (21) Word has length 243 [2021-11-12 23:47:00,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:47:00,686 INFO L225 Difference]: With dead ends: 4244 [2021-11-12 23:47:00,687 INFO L226 Difference]: Without dead ends: 2151 [2021-11-12 23:47:00,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 961 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:47:00,694 INFO L933 BasicCegarLoop]: 791 mSDtfsCounter, 0 mSDsluCounter, 787 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2125.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1578 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.86ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2211.03ms IncrementalHoareTripleChecker+Time [2021-11-12 23:47:00,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1578 Invalid, 4 Unknown, 0 Unchecked, 2.86ms Time], IncrementalHoareTripleChecker [0 Valid, 3 Invalid, 1 Unknown, 0 Unchecked, 2211.03ms Time] [2021-11-12 23:47:00,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2151 states. [2021-11-12 23:47:00,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2151 to 2151. [2021-11-12 23:47:00,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2151 states, 1701 states have (on average 1.345679012345679) internal successors, (2289), 1704 states have internal predecessors, (2289), 321 states have call successors, (321), 128 states have call predecessors, (321), 128 states have return successors, (321), 318 states have call predecessors, (321), 321 states have call successors, (321) [2021-11-12 23:47:00,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2151 states to 2151 states and 2931 transitions. [2021-11-12 23:47:00,788 INFO L78 Accepts]: Start accepts. Automaton has 2151 states and 2931 transitions. Word has length 243 [2021-11-12 23:47:00,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:47:00,789 INFO L470 AbstractCegarLoop]: Abstraction has 2151 states and 2931 transitions. [2021-11-12 23:47:00,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 2 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 1 states have call predecessors, (21), 1 states have call successors, (21) [2021-11-12 23:47:00,790 INFO L276 IsEmpty]: Start isEmpty. Operand 2151 states and 2931 transitions. [2021-11-12 23:47:00,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-11-12 23:47:00,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:47:00,794 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:47:00,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (14)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:01,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (15)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:01,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:01,211 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:47:01,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:47:01,211 INFO L85 PathProgramCache]: Analyzing trace with hash 1355835084, now seen corresponding path program 1 times [2021-11-12 23:47:01,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:47:01,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [382330615] [2021-11-12 23:47:01,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:01,214 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:47:01,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:47:01,215 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:47:01,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-12 23:47:02,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:02,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 1594 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:47:02,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 264 proven. 1 refuted. 0 times theorem prover too weak. 238 trivial. 0 not checked. [2021-11-12 23:47:04,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:06,588 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2021-11-12 23:47:06,588 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:47:06,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [382330615] [2021-11-12 23:47:06,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [382330615] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:47:06,589 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [535788706] [2021-11-12 23:47:06,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:06,589 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:06,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:47:06,609 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:47:06,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-12 23:47:07,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:07,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 1594 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:47:07,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:11,755 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 232 proven. 0 refuted. 0 times theorem prover too weak. 271 trivial. 0 not checked. [2021-11-12 23:47:11,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:13,681 INFO L134 CoverageAnalysis]: Checked inductivity of 503 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-12 23:47:13,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [535788706] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:47:13,682 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:47:13,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:47:13,683 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839904229] [2021-11-12 23:47:13,683 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:47:13,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:47:13,684 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:47:13,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:47:13,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:47:13,685 INFO L87 Difference]: Start difference. First operand 2151 states and 2931 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) [2021-11-12 23:47:15,830 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:47:16,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:47:16,062 INFO L93 Difference]: Finished difference Result 4210 states and 5750 transitions. [2021-11-12 23:47:16,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:47:16,064 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) Word has length 243 [2021-11-12 23:47:16,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:47:16,093 INFO L225 Difference]: With dead ends: 4210 [2021-11-12 23:47:16,093 INFO L226 Difference]: Without dead ends: 4208 [2021-11-12 23:47:16,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 968 GetRequests, 961 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:47:16,097 INFO L933 BasicCegarLoop]: 901 mSDtfsCounter, 646 mSDsluCounter, 765 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2235.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 646 SdHoareTripleChecker+Valid, 1666 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 4.67ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2276.53ms IncrementalHoareTripleChecker+Time [2021-11-12 23:47:16,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [646 Valid, 1666 Invalid, 6 Unknown, 0 Unchecked, 4.67ms Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 1 Unknown, 0 Unchecked, 2276.53ms Time] [2021-11-12 23:47:16,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4208 states. [2021-11-12 23:47:16,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4208 to 4204. [2021-11-12 23:47:16,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4204 states, 3332 states have (on average 1.3502400960384153) internal successors, (4499), 3340 states have internal predecessors, (4499), 620 states have call successors, (620), 251 states have call predecessors, (620), 251 states have return successors, (620), 612 states have call predecessors, (620), 620 states have call successors, (620) [2021-11-12 23:47:16,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4204 states to 4204 states and 5739 transitions. [2021-11-12 23:47:16,321 INFO L78 Accepts]: Start accepts. Automaton has 4204 states and 5739 transitions. Word has length 243 [2021-11-12 23:47:16,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:47:16,322 INFO L470 AbstractCegarLoop]: Abstraction has 4204 states and 5739 transitions. [2021-11-12 23:47:16,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 2 states have call successors, (37), 2 states have call predecessors, (37), 2 states have return successors, (35), 2 states have call predecessors, (35), 2 states have call successors, (35) [2021-11-12 23:47:16,323 INFO L276 IsEmpty]: Start isEmpty. Operand 4204 states and 5739 transitions. [2021-11-12 23:47:16,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 296 [2021-11-12 23:47:16,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:47:16,332 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:47:16,375 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:16,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:16,755 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:16,755 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:47:16,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:47:16,755 INFO L85 PathProgramCache]: Analyzing trace with hash -1956375354, now seen corresponding path program 1 times [2021-11-12 23:47:16,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:47:16,757 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1175445809] [2021-11-12 23:47:16,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:16,757 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:47:16,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:47:16,758 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:47:16,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-12 23:47:18,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:18,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:47:18,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:20,844 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 280 proven. 1 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2021-11-12 23:47:20,844 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:22,984 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 535 trivial. 0 not checked. [2021-11-12 23:47:22,984 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:47:22,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1175445809] [2021-11-12 23:47:22,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1175445809] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:47:22,985 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1003423804] [2021-11-12 23:47:22,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:22,985 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:22,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:47:22,990 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:47:22,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-12 23:47:24,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:24,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 1737 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:47:24,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:25,354 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 503 trivial. 0 not checked. [2021-11-12 23:47:25,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:26,292 INFO L134 CoverageAnalysis]: Checked inductivity of 564 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2021-11-12 23:47:26,292 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1003423804] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:47:26,293 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:47:26,293 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-12 23:47:26,293 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544323236] [2021-11-12 23:47:26,293 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:47:26,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:47:26,294 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:47:26,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:47:26,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:47:26,295 INFO L87 Difference]: Start difference. First operand 4204 states and 5739 transitions. Second operand has 4 states, 4 states have (on average 36.0) internal successors, (144), 4 states have internal predecessors, (144), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-12 23:47:28,416 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:47:32,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:47:32,521 INFO L93 Difference]: Finished difference Result 9720 states and 13368 transitions. [2021-11-12 23:47:32,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:47:32,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 36.0) internal successors, (144), 4 states have internal predecessors, (144), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) Word has length 295 [2021-11-12 23:47:32,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:47:32,563 INFO L225 Difference]: With dead ends: 9720 [2021-11-12 23:47:32,563 INFO L226 Difference]: Without dead ends: 5568 [2021-11-12 23:47:32,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 1168 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:47:32,579 INFO L933 BasicCegarLoop]: 1051 mSDtfsCounter, 1024 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 156 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5766.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1024 SdHoareTripleChecker+Valid, 1809 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 9.20ms SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6020.40ms IncrementalHoareTripleChecker+Time [2021-11-12 23:47:32,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1024 Valid, 1809 Invalid, 493 Unknown, 0 Unchecked, 9.20ms Time], IncrementalHoareTripleChecker [156 Valid, 336 Invalid, 1 Unknown, 0 Unchecked, 6020.40ms Time] [2021-11-12 23:47:32,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5568 states. [2021-11-12 23:47:32,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5568 to 5528. [2021-11-12 23:47:32,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5528 states, 4460 states have (on average 1.3482062780269057) internal successors, (6013), 4470 states have internal predecessors, (6013), 742 states have call successors, (742), 325 states have call predecessors, (742), 325 states have return successors, (742), 732 states have call predecessors, (742), 742 states have call successors, (742) [2021-11-12 23:47:32,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5528 states to 5528 states and 7497 transitions. [2021-11-12 23:47:32,953 INFO L78 Accepts]: Start accepts. Automaton has 5528 states and 7497 transitions. Word has length 295 [2021-11-12 23:47:32,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:47:32,954 INFO L470 AbstractCegarLoop]: Abstraction has 5528 states and 7497 transitions. [2021-11-12 23:47:32,955 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 36.0) internal successors, (144), 4 states have internal predecessors, (144), 2 states have call successors, (32), 2 states have call predecessors, (32), 2 states have return successors, (31), 2 states have call predecessors, (31), 2 states have call successors, (31) [2021-11-12 23:47:32,956 INFO L276 IsEmpty]: Start isEmpty. Operand 5528 states and 7497 transitions. [2021-11-12 23:47:32,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-11-12 23:47:32,968 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:47:32,969 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:47:33,014 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:33,202 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:33,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:33,391 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:47:33,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:47:33,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1820937934, now seen corresponding path program 1 times [2021-11-12 23:47:33,394 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:47:33,394 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [212220553] [2021-11-12 23:47:33,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:33,394 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:47:33,395 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:47:33,399 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:47:33,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-12 23:47:34,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:35,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 1794 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:47:35,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 288 proven. 1 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-12 23:47:37,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:40,314 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 582 trivial. 0 not checked. [2021-11-12 23:47:40,314 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:47:40,314 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [212220553] [2021-11-12 23:47:40,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [212220553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:47:40,314 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [158290234] [2021-11-12 23:47:40,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:40,314 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:40,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:47:40,315 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:47:40,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-12 23:47:41,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:41,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 1794 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:47:41,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:42,739 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 83 proven. 0 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2021-11-12 23:47:42,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:43,966 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 582 trivial. 0 not checked. [2021-11-12 23:47:43,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [158290234] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:47:43,967 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:47:43,967 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-12 23:47:43,967 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781135830] [2021-11-12 23:47:43,968 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:47:43,968 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:47:43,968 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:47:43,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:47:43,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:47:43,969 INFO L87 Difference]: Start difference. First operand 5528 states and 7497 transitions. Second operand has 6 states, 6 states have (on average 22.833333333333332) internal successors, (137), 6 states have internal predecessors, (137), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:47:46,111 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:47:48,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:47:48,616 INFO L93 Difference]: Finished difference Result 15580 states and 20910 transitions. [2021-11-12 23:47:48,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:47:48,617 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 22.833333333333332) internal successors, (137), 6 states have internal predecessors, (137), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) Word has length 316 [2021-11-12 23:47:48,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:47:48,689 INFO L225 Difference]: With dead ends: 15580 [2021-11-12 23:47:48,690 INFO L226 Difference]: Without dead ends: 10104 [2021-11-12 23:47:48,758 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1263 GetRequests, 1251 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:47:48,759 INFO L933 BasicCegarLoop]: 1229 mSDtfsCounter, 1552 mSDsluCounter, 2365 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 158 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3820.88ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1552 SdHoareTripleChecker+Valid, 3594 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.55ms SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3978.15ms IncrementalHoareTripleChecker+Time [2021-11-12 23:47:48,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1552 Valid, 3594 Invalid, 291 Unknown, 0 Unchecked, 13.55ms Time], IncrementalHoareTripleChecker [158 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 3978.15ms Time] [2021-11-12 23:47:48,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10104 states. [2021-11-12 23:47:49,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10104 to 5536. [2021-11-12 23:47:49,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5536 states, 4468 states have (on average 1.3475828111011638) internal successors, (6021), 4478 states have internal predecessors, (6021), 742 states have call successors, (742), 325 states have call predecessors, (742), 325 states have return successors, (742), 732 states have call predecessors, (742), 742 states have call successors, (742) [2021-11-12 23:47:49,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5536 states to 5536 states and 7505 transitions. [2021-11-12 23:47:49,174 INFO L78 Accepts]: Start accepts. Automaton has 5536 states and 7505 transitions. Word has length 316 [2021-11-12 23:47:49,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:47:49,177 INFO L470 AbstractCegarLoop]: Abstraction has 5536 states and 7505 transitions. [2021-11-12 23:47:49,177 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 22.833333333333332) internal successors, (137), 6 states have internal predecessors, (137), 2 states have call successors, (33), 2 states have call predecessors, (33), 2 states have return successors, (32), 2 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-12 23:47:49,177 INFO L276 IsEmpty]: Start isEmpty. Operand 5536 states and 7505 transitions. [2021-11-12 23:47:49,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2021-11-12 23:47:49,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:47:49,188 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:47:49,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:49,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-12 23:47:49,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:49,603 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:47:49,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:47:49,603 INFO L85 PathProgramCache]: Analyzing trace with hash -1453629428, now seen corresponding path program 1 times [2021-11-12 23:47:49,605 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:47:49,605 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [664282653] [2021-11-12 23:47:49,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:49,606 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:47:49,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:47:49,607 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:47:49,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-12 23:47:51,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:51,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 1836 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:47:51,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:54,223 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 288 proven. 1 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2021-11-12 23:47:54,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:56,496 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 582 trivial. 0 not checked. [2021-11-12 23:47:56,497 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:47:56,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [664282653] [2021-11-12 23:47:56,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [664282653] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:47:56,497 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1541203100] [2021-11-12 23:47:56,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:47:56,498 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:47:56,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:47:56,507 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:47:56,518 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-12 23:47:57,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:47:57,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 1836 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:47:57,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:47:58,419 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2021-11-12 23:47:58,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:47:59,350 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 592 trivial. 0 not checked. [2021-11-12 23:47:59,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1541203100] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:47:59,350 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:47:59,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-12 23:47:59,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719312388] [2021-11-12 23:47:59,351 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:47:59,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:47:59,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:47:59,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:47:59,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:47:59,352 INFO L87 Difference]: Start difference. First operand 5536 states and 7505 transitions. Second operand has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-12 23:48:01,469 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-12 23:48:04,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:48:04,568 INFO L93 Difference]: Finished difference Result 19148 states and 25898 transitions. [2021-11-12 23:48:04,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:48:04,569 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 322 [2021-11-12 23:48:04,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:48:04,630 INFO L225 Difference]: With dead ends: 19148 [2021-11-12 23:48:04,630 INFO L226 Difference]: Without dead ends: 13664 [2021-11-12 23:48:04,645 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1287 GetRequests, 1275 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-12 23:48:04,646 INFO L933 BasicCegarLoop]: 1414 mSDtfsCounter, 1781 mSDsluCounter, 4029 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 209 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4270.75ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 1781 SdHoareTripleChecker+Valid, 5443 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.41ms SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4474.13ms IncrementalHoareTripleChecker+Time [2021-11-12 23:48:04,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1781 Valid, 5443 Invalid, 406 Unknown, 0 Unchecked, 13.41ms Time], IncrementalHoareTripleChecker [209 Valid, 196 Invalid, 1 Unknown, 0 Unchecked, 4474.13ms Time] [2021-11-12 23:48:04,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13664 states. [2021-11-12 23:48:05,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13664 to 5544. [2021-11-12 23:48:05,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5544 states, 4476 states have (on average 1.3469615728328865) internal successors, (6029), 4486 states have internal predecessors, (6029), 742 states have call successors, (742), 325 states have call predecessors, (742), 325 states have return successors, (742), 732 states have call predecessors, (742), 742 states have call successors, (742) [2021-11-12 23:48:05,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5544 states to 5544 states and 7513 transitions. [2021-11-12 23:48:05,132 INFO L78 Accepts]: Start accepts. Automaton has 5544 states and 7513 transitions. Word has length 322 [2021-11-12 23:48:05,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:48:05,133 INFO L470 AbstractCegarLoop]: Abstraction has 5544 states and 7513 transitions. [2021-11-12 23:48:05,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.5) internal successors, (129), 6 states have internal predecessors, (129), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-12 23:48:05,133 INFO L276 IsEmpty]: Start isEmpty. Operand 5544 states and 7513 transitions. [2021-11-12 23:48:05,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2021-11-12 23:48:05,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:48:05,144 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:48:05,156 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:05,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:05,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:48:05,557 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:48:05,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:48:05,558 INFO L85 PathProgramCache]: Analyzing trace with hash -669269360, now seen corresponding path program 1 times [2021-11-12 23:48:05,560 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:48:05,560 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1161689988] [2021-11-12 23:48:05,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:05,560 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:48:05,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:48:05,561 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:48:05,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-12 23:48:07,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:07,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 2002 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:48:07,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:10,587 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 296 proven. 1 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-12 23:48:10,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:13,024 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2021-11-12 23:48:13,024 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:48:13,025 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1161689988] [2021-11-12 23:48:13,025 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1161689988] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:48:13,025 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1531606006] [2021-11-12 23:48:13,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:13,025 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:48:13,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:48:13,035 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:48:13,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-12 23:48:14,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:14,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 2002 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:48:14,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:15,125 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-11-12 23:48:15,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:15,979 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 638 trivial. 0 not checked. [2021-11-12 23:48:15,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1531606006] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:48:15,979 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:48:15,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-12 23:48:15,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032932395] [2021-11-12 23:48:15,981 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:48:15,982 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:48:15,982 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:48:15,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:48:15,983 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:48:15,983 INFO L87 Difference]: Start difference. First operand 5544 states and 7513 transitions. Second operand has 3 states, 3 states have (on average 52.0) internal successors, (156), 3 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:48:16,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:48:16,257 INFO L93 Difference]: Finished difference Result 11040 states and 14972 transitions. [2021-11-12 23:48:16,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:48:16,258 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 3 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) Word has length 375 [2021-11-12 23:48:16,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:48:16,275 INFO L225 Difference]: With dead ends: 11040 [2021-11-12 23:48:16,275 INFO L226 Difference]: Without dead ends: 5548 [2021-11-12 23:48:16,288 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1496 GetRequests, 1489 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:48:16,289 INFO L933 BasicCegarLoop]: 791 mSDtfsCounter, 0 mSDsluCounter, 786 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 73.29ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 1577 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.58ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 76.14ms IncrementalHoareTripleChecker+Time [2021-11-12 23:48:16,289 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 1577 Invalid, 6 Unknown, 0 Unchecked, 2.58ms Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 76.14ms Time] [2021-11-12 23:48:16,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5548 states. [2021-11-12 23:48:16,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5548 to 5548. [2021-11-12 23:48:16,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5548 states, 4480 states have (on average 1.3466517857142857) internal successors, (6033), 4490 states have internal predecessors, (6033), 742 states have call successors, (742), 325 states have call predecessors, (742), 325 states have return successors, (742), 732 states have call predecessors, (742), 742 states have call successors, (742) [2021-11-12 23:48:16,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5548 states to 5548 states and 7517 transitions. [2021-11-12 23:48:16,680 INFO L78 Accepts]: Start accepts. Automaton has 5548 states and 7517 transitions. Word has length 375 [2021-11-12 23:48:16,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:48:16,681 INFO L470 AbstractCegarLoop]: Abstraction has 5548 states and 7517 transitions. [2021-11-12 23:48:16,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.0) internal successors, (156), 3 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:48:16,681 INFO L276 IsEmpty]: Start isEmpty. Operand 5548 states and 7517 transitions. [2021-11-12 23:48:16,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2021-11-12 23:48:16,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:48:16,694 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:48:16,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:16,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (25)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:17,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:48:17,115 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:48:17,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:48:17,115 INFO L85 PathProgramCache]: Analyzing trace with hash -9737838, now seen corresponding path program 1 times [2021-11-12 23:48:17,117 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:48:17,117 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1195960789] [2021-11-12 23:48:17,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:17,117 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:48:17,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:48:17,118 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:48:17,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-12 23:48:18,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:18,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 2004 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:48:18,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:22,276 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 296 proven. 1 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-12 23:48:22,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:24,770 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2021-11-12 23:48:24,770 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:48:24,770 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1195960789] [2021-11-12 23:48:24,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1195960789] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:48:24,770 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1026503141] [2021-11-12 23:48:24,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:24,771 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:48:24,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:48:24,771 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:48:24,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-12 23:48:25,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:25,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 2004 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:48:25,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:26,970 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-11-12 23:48:26,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:27,810 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 638 trivial. 0 not checked. [2021-11-12 23:48:27,810 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1026503141] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:48:27,810 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:48:27,811 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-12 23:48:27,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204573758] [2021-11-12 23:48:27,811 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:48:27,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:48:27,812 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:48:27,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:48:27,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-12 23:48:27,812 INFO L87 Difference]: Start difference. First operand 5548 states and 7517 transitions. Second operand has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:48:28,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:48:28,259 INFO L93 Difference]: Finished difference Result 11060 states and 15000 transitions. [2021-11-12 23:48:28,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:48:28,261 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) Word has length 375 [2021-11-12 23:48:28,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:48:28,279 INFO L225 Difference]: With dead ends: 11060 [2021-11-12 23:48:28,280 INFO L226 Difference]: Without dead ends: 5564 [2021-11-12 23:48:28,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1497 GetRequests, 1488 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:48:28,294 INFO L933 BasicCegarLoop]: 789 mSDtfsCounter, 2 mSDsluCounter, 1571 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 130.85ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 2360 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.92ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 135.81ms IncrementalHoareTripleChecker+Time [2021-11-12 23:48:28,295 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 2360 Invalid, 16 Unknown, 0 Unchecked, 2.92ms Time], IncrementalHoareTripleChecker [2 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 135.81ms Time] [2021-11-12 23:48:28,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5564 states. [2021-11-12 23:48:28,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5564 to 5560. [2021-11-12 23:48:28,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5560 states, 4492 states have (on average 1.345725734639359) internal successors, (6045), 4502 states have internal predecessors, (6045), 742 states have call successors, (742), 325 states have call predecessors, (742), 325 states have return successors, (742), 732 states have call predecessors, (742), 742 states have call successors, (742) [2021-11-12 23:48:28,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5560 states to 5560 states and 7529 transitions. [2021-11-12 23:48:28,605 INFO L78 Accepts]: Start accepts. Automaton has 5560 states and 7529 transitions. Word has length 375 [2021-11-12 23:48:28,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:48:28,606 INFO L470 AbstractCegarLoop]: Abstraction has 5560 states and 7529 transitions. [2021-11-12 23:48:28,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 39.0) internal successors, (156), 4 states have internal predecessors, (156), 2 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-12 23:48:28,607 INFO L276 IsEmpty]: Start isEmpty. Operand 5560 states and 7529 transitions. [2021-11-12 23:48:28,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2021-11-12 23:48:28,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:48:28,617 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:48:28,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:28,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:29,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 [2021-11-12 23:48:29,025 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:48:29,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:48:29,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1978961522, now seen corresponding path program 1 times [2021-11-12 23:48:29,027 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:48:29,027 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1239007906] [2021-11-12 23:48:29,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:29,028 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:48:29,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:48:29,028 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:48:29,029 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-12 23:48:30,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:30,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 2008 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:48:30,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:33,881 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 296 proven. 1 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-12 23:48:33,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:36,458 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 628 trivial. 0 not checked. [2021-11-12 23:48:36,458 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:48:36,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1239007906] [2021-11-12 23:48:36,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1239007906] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:48:36,458 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [497657859] [2021-11-12 23:48:36,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:48:36,459 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:48:36,459 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:48:36,460 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:48:36,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-12 23:48:37,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:48:37,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 2008 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-12 23:48:37,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:48:41,359 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 111 proven. 0 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2021-11-12 23:48:41,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:48:45,928 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 35 proven. 16 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2021-11-12 23:48:45,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [497657859] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:48:45,928 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-12 23:48:45,929 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5, 5, 8] total 21 [2021-11-12 23:48:45,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697948016] [2021-11-12 23:48:45,929 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:48:45,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-12 23:48:45,930 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-12 23:48:45,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-12 23:48:45,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2021-11-12 23:48:45,931 INFO L87 Difference]: Start difference. First operand 5560 states and 7529 transitions. Second operand has 9 states, 9 states have (on average 18.11111111111111) internal successors, (163), 7 states have internal predecessors, (163), 3 states have call successors, (34), 2 states have call predecessors, (34), 4 states have return successors, (33), 5 states have call predecessors, (33), 3 states have call successors, (33) [2021-11-12 23:48:48,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:48:48,693 INFO L93 Difference]: Finished difference Result 11986 states and 16266 transitions. [2021-11-12 23:48:48,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:48:48,694 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 18.11111111111111) internal successors, (163), 7 states have internal predecessors, (163), 3 states have call successors, (34), 2 states have call predecessors, (34), 4 states have return successors, (33), 5 states have call predecessors, (33), 3 states have call successors, (33) Word has length 375 [2021-11-12 23:48:48,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:48:48,719 INFO L225 Difference]: With dead ends: 11986 [2021-11-12 23:48:48,719 INFO L226 Difference]: Without dead ends: 6478 [2021-11-12 23:48:48,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1500 GetRequests, 1478 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-11-12 23:48:48,732 INFO L933 BasicCegarLoop]: 974 mSDtfsCounter, 558 mSDsluCounter, 5990 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1726.16ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 6964 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.71ms SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1789.76ms IncrementalHoareTripleChecker+Time [2021-11-12 23:48:48,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [635 Valid, 6964 Invalid, 122 Unknown, 0 Unchecked, 10.71ms Time], IncrementalHoareTripleChecker [41 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 1789.76ms Time] [2021-11-12 23:48:48,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6478 states. [2021-11-12 23:48:49,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6478 to 5592. [2021-11-12 23:48:49,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5592 states, 4516 states have (on average 1.3438883968113375) internal successors, (6069), 4526 states have internal predecessors, (6069), 742 states have call successors, (742), 325 states have call predecessors, (742), 333 states have return successors, (762), 740 states have call predecessors, (762), 742 states have call successors, (762) [2021-11-12 23:48:49,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5592 states to 5592 states and 7573 transitions. [2021-11-12 23:48:49,067 INFO L78 Accepts]: Start accepts. Automaton has 5592 states and 7573 transitions. Word has length 375 [2021-11-12 23:48:49,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:48:49,068 INFO L470 AbstractCegarLoop]: Abstraction has 5592 states and 7573 transitions. [2021-11-12 23:48:49,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 18.11111111111111) internal successors, (163), 7 states have internal predecessors, (163), 3 states have call successors, (34), 2 states have call predecessors, (34), 4 states have return successors, (33), 5 states have call predecessors, (33), 3 states have call successors, (33) [2021-11-12 23:48:49,068 INFO L276 IsEmpty]: Start isEmpty. Operand 5592 states and 7573 transitions. [2021-11-12 23:48:49,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 382 [2021-11-12 23:48:49,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:48:49,079 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:48:49,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:49,303 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (29)] Forceful destruction successful, exit code 0 [2021-11-12 23:48:49,495 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt [2021-11-12 23:48:49,495 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:48:49,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:48:49,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1486070255, now seen corresponding path program 2 times [2021-11-12 23:48:49,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-12 23:48:49,498 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1033936331] [2021-11-12 23:48:49,498 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 23:48:49,498 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-12 23:48:49,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat [2021-11-12 23:48:49,499 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-12 23:48:49,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/mathsat -unsat_core_generation=3 (30)] Waiting until timeout for monitored process [2021-11-12 23:52:19,977 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-12 23:52:19,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:52:20,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 2023 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-12 23:52:20,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:52:24,248 INFO L134 CoverageAnalysis]: Checked inductivity of 701 backedges. 324 proven. 1 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-11-12 23:52:24,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:52:26,833 INFO L134 CoverageAnalysis]: Checked inductivity of 701 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-11-12 23:52:26,833 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-12 23:52:26,833 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1033936331] [2021-11-12 23:52:26,833 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1033936331] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-12 23:52:26,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1204587649] [2021-11-12 23:52:26,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-12 23:52:26,834 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-12 23:52:26,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 [2021-11-12 23:52:26,844 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-12 23:52:26,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d6663a26-2c98-42b8-b626-6bcb23cb2caf/bin/utaipan-vmNK8stdcF/cvc4 --incremental --print-success --lang smt (31)] Waiting until timeout for monitored process