./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8 --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 cb4cf2f7b619bb65636b8158cc0f6ae5cf90699f1f1c19bf802021a20c422d2c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:08:30,872 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:08:30,875 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:08:30,927 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:08:30,928 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:08:30,932 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:08:30,934 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:08:30,937 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:08:30,940 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:08:30,946 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:08:30,947 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:08:30,949 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:08:30,949 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:08:30,952 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:08:30,954 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:08:30,958 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:08:30,960 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:08:30,961 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:08:30,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:08:30,970 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:08:30,972 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:08:30,974 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:08:30,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:08:30,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:08:30,987 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:08:30,987 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:08:30,988 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:08:30,990 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:08:30,991 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:08:30,992 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:08:30,993 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:08:30,994 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:08:30,996 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:08:30,997 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:08:30,999 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:08:30,999 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:08:31,000 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:08:31,000 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:08:31,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:08:31,002 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:08:31,002 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:08:31,003 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-07 01:08:31,054 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:08:31,055 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:08:31,056 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:08:31,056 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:08:31,057 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:08:31,057 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:08:31,057 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:08:31,058 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:08:31,061 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:08:31,061 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:08:31,062 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:08:31,063 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:08:31,063 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:08:31,064 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:08:31,064 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:08:31,065 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:08:31,065 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:08:31,065 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:08:31,066 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:08:31,066 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:08:31,066 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:08:31,078 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:08:31,078 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:08:31,078 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:08:31,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:08:31,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:08:31,079 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:08:31,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:31,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:08:31,081 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:08:31,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:08:31,082 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:08:31,082 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:08:31,082 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:08:31,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:08:31,083 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:08:31,083 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_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb4cf2f7b619bb65636b8158cc0f6ae5cf90699f1f1c19bf802021a20c422d2c [2021-11-07 01:08:31,371 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:08:31,396 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:08:31,399 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:08:31,401 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:08:31,402 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:08:31,403 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i [2021-11-07 01:08:31,483 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/50cee301f/05fad2e63fed46aeb9242d05e5837990/FLAGbd5ac3d9a [2021-11-07 01:08:32,262 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:08:32,264 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i [2021-11-07 01:08:32,307 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/50cee301f/05fad2e63fed46aeb9242d05e5837990/FLAGbd5ac3d9a [2021-11-07 01:08:32,816 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/50cee301f/05fad2e63fed46aeb9242d05e5837990 [2021-11-07 01:08:32,819 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:08:32,821 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:08:32,823 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:32,823 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:08:32,826 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:08:32,827 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:32" (1/1) ... [2021-11-07 01:08:32,828 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53e22e21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:32, skipping insertion in model container [2021-11-07 01:08:32,828 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:32" (1/1) ... [2021-11-07 01:08:32,837 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:08:32,953 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:33,571 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_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i[153287,153300] [2021-11-07 01:08:33,795 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:33,852 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) [2021-11-07 01:08:33,852 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver@653ac75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:33, skipping insertion in model container [2021-11-07 01:08:33,852 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:33,853 INFO L184 ToolchainWalker]: Toolchain execution was canceled (user or tool) before executing de.uni_freiburg.informatik.ultimate.boogie.procedureinliner [2021-11-07 01:08:33,855 INFO L168 Benchmark]: Toolchain (without parser) took 1032.11 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 59.9 MB in the beginning and 76.7 MB in the end (delta: -16.8 MB). Peak memory consumption was 39.4 MB. Max. memory is 16.1 GB. [2021-11-07 01:08:33,855 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 90.2 MB. Free memory was 62.5 MB in the beginning and 62.5 MB in the end (delta: 77.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 01:08:33,856 INFO L168 Benchmark]: CACSL2BoogieTranslator took 1029.81 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 59.5 MB in the beginning and 76.7 MB in the end (delta: -17.3 MB). Peak memory consumption was 37.3 MB. Max. memory is 16.1 GB. [2021-11-07 01:08:33,860 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 90.2 MB. Free memory was 62.5 MB in the beginning and 62.5 MB in the end (delta: 77.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 1029.81 ms. Allocated memory was 90.2 MB in the beginning and 109.1 MB in the end (delta: 18.9 MB). Free memory was 59.5 MB in the beginning and 76.7 MB in the end (delta: -17.3 MB). Peak memory consumption was 37.3 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - UnsupportedSyntaxResult [Line: 5421]: 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_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8 --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 cb4cf2f7b619bb65636b8158cc0f6ae5cf90699f1f1c19bf802021a20c422d2c --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:08:36,144 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:08:36,146 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:08:36,207 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:08:36,208 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:08:36,213 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:08:36,215 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:08:36,224 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:08:36,228 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:08:36,238 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:08:36,239 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:08:36,241 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:08:36,242 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:08:36,245 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:08:36,246 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:08:36,249 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:08:36,254 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:08:36,255 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:08:36,257 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:08:36,262 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:08:36,267 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:08:36,269 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:08:36,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:08:36,274 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:08:36,281 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:08:36,282 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:08:36,282 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:08:36,284 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:08:36,285 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:08:36,286 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:08:36,287 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:08:36,288 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:08:36,290 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:08:36,291 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:08:36,292 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:08:36,293 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:08:36,294 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:08:36,294 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:08:36,294 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:08:36,296 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:08:36,297 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:08:36,298 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2021-11-07 01:08:36,344 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:08:36,345 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:08:36,346 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:08:36,346 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:08:36,346 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:08:36,347 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:08:36,347 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:08:36,347 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:08:36,348 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:08:36,350 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:08:36,351 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:08:36,351 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:08:36,351 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:08:36,351 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:08:36,352 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:08:36,352 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 01:08:36,352 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 01:08:36,352 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:08:36,353 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:08:36,353 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:08:36,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:08:36,353 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 01:08:36,353 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:08:36,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:36,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:08:36,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:08:36,354 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:08:36,355 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 01:08:36,355 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:36,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:08:36,355 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:08:36,355 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:08:36,356 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_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb4cf2f7b619bb65636b8158cc0f6ae5cf90699f1f1c19bf802021a20c422d2c [2021-11-07 01:08:36,703 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:08:36,724 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:08:36,726 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:08:36,727 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:08:36,728 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:08:36,729 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i [2021-11-07 01:08:36,793 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/c3e433c04/0a952bd592ef4730a357e6ddc72d8e66/FLAGf5824a256 [2021-11-07 01:08:37,650 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:08:37,651 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i [2021-11-07 01:08:37,694 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/c3e433c04/0a952bd592ef4730a357e6ddc72d8e66/FLAGf5824a256 [2021-11-07 01:08:38,213 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/data/c3e433c04/0a952bd592ef4730a357e6ddc72d8e66 [2021-11-07 01:08:38,216 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:08:38,217 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:08:38,219 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:38,219 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:08:38,223 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:08:38,223 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:38" (1/1) ... [2021-11-07 01:08:38,225 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@502aec5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:38, skipping insertion in model container [2021-11-07 01:08:38,225 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:08:38" (1/1) ... [2021-11-07 01:08:38,233 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:08:38,350 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:39,113 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_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i[153287,153300] [2021-11-07 01:08:39,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:39,404 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-07 01:08:39,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:08:39,582 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_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i[153287,153300] [2021-11-07 01:08:39,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:39,627 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:08:39,775 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_85b42320-8f90-497a-b4c2-6174baac3aab/sv-benchmarks/c/ldv-linux-3.16-rc1/205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i[153287,153300] [2021-11-07 01:08:39,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:08:39,846 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:08:39,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39 WrapperNode [2021-11-07 01:08:39,846 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:08:39,847 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:08:39,848 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:08:39,848 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:08:39,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:39,887 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:39,949 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:08:39,950 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:08:39,950 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:08:39,950 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:08:39,965 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:39,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:39,980 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:39,981 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:40,041 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:40,049 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:40,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:40,064 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:08:40,065 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:08:40,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:08:40,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:08:40,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (1/1) ... [2021-11-07 01:08:40,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:08:40,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:08:40,097 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:08:40,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:08:40,149 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-07 01:08:40,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-07 01:08:40,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE8 [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE8 [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE2 [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-07 01:08:40,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-07 01:08:40,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-07 01:08:40,151 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-07 01:08:40,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE8 [2021-11-07 01:08:40,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-07 01:08:40,151 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE2 [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE4 [2021-11-07 01:08:40,152 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE2 [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE8 [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-07 01:08:40,153 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:08:40,154 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:08:45,832 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:08:45,833 INFO L299 CfgBuilder]: Removed 109 assume(true) statements. [2021-11-07 01:08:45,835 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:08:45 BoogieIcfgContainer [2021-11-07 01:08:45,835 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:08:45,837 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:08:45,838 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:08:45,841 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:08:45,841 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:08:38" (1/3) ... [2021-11-07 01:08:45,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2468c0ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:08:45, skipping insertion in model container [2021-11-07 01:08:45,842 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:08:39" (2/3) ... [2021-11-07 01:08:45,842 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2468c0ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:08:45, skipping insertion in model container [2021-11-07 01:08:45,843 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:08:45" (3/3) ... [2021-11-07 01:08:45,844 INFO L111 eAbstractionObserver]: Analyzing ICFG 205_9a_array_safes_linux-3.16-rc1.tar.xz-205_9a-drivers--net--arcnet--arc-rawmode.ko-entry_point.cil.out.i [2021-11-07 01:08:45,850 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:08:45,850 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:08:45,987 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:08:46,002 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 [2021-11-07 01:08:46,003 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:08:46,039 INFO L276 IsEmpty]: Start isEmpty. Operand has 136 states, 134 states have (on average 1.507462686567164) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:46,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-07 01:08:46,048 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:46,048 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:46,049 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:46,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:46,055 INFO L85 PathProgramCache]: Analyzing trace with hash -695882203, now seen corresponding path program 1 times [2021-11-07 01:08:46,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:46,071 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [44908805] [2021-11-07 01:08:46,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:46,072 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:46,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:46,076 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:46,117 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 01:08:46,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:46,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 01:08:46,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:46,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:46,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:46,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:08:46,560 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:46,560 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [44908805] [2021-11-07 01:08:46,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [44908805] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:46,561 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:46,561 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:46,563 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068868542] [2021-11-07 01:08:46,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:46,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:46,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:46,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:46,585 INFO L87 Difference]: Start difference. First operand has 136 states, 134 states have (on average 1.507462686567164) internal successors, (202), 135 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:46,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:46,651 INFO L93 Difference]: Finished difference Result 268 states and 399 transitions. [2021-11-07 01:08:46,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:46,654 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-07 01:08:46,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:46,665 INFO L225 Difference]: With dead ends: 268 [2021-11-07 01:08:46,665 INFO L226 Difference]: Without dead ends: 130 [2021-11-07 01:08:46,669 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:46,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-07 01:08:46,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2021-11-07 01:08:46,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.3875968992248062) internal successors, (179), 129 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:46,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 179 transitions. [2021-11-07 01:08:46,714 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 179 transitions. Word has length 18 [2021-11-07 01:08:46,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:46,715 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 179 transitions. [2021-11-07 01:08:46,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:46,716 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 179 transitions. [2021-11-07 01:08:46,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 01:08:46,717 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:46,717 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:46,734 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:46,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:46,930 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:46,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:46,931 INFO L85 PathProgramCache]: Analyzing trace with hash 1963993750, now seen corresponding path program 1 times [2021-11-07 01:08:46,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:46,932 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1582629044] [2021-11-07 01:08:46,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:46,932 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:46,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:46,933 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:46,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-07 01:08:47,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:47,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:47,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:47,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:47,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:47,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:47,312 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:47,312 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1582629044] [2021-11-07 01:08:47,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1582629044] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:47,312 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:47,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:47,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397500784] [2021-11-07 01:08:47,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:47,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:47,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:47,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:47,316 INFO L87 Difference]: Start difference. First operand 130 states and 179 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:47,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:47,521 INFO L93 Difference]: Finished difference Result 438 states and 617 transitions. [2021-11-07 01:08:47,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:47,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-07 01:08:47,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:47,526 INFO L225 Difference]: With dead ends: 438 [2021-11-07 01:08:47,526 INFO L226 Difference]: Without dead ends: 319 [2021-11-07 01:08:47,528 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:47,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-11-07 01:08:47,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2021-11-07 01:08:47,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.4056603773584906) internal successors, (447), 318 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:47,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 447 transitions. [2021-11-07 01:08:47,559 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 447 transitions. Word has length 19 [2021-11-07 01:08:47,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:47,560 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 447 transitions. [2021-11-07 01:08:47,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:47,560 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 447 transitions. [2021-11-07 01:08:47,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 01:08:47,562 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:47,562 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:08:47,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:47,774 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:47,774 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:47,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:47,775 INFO L85 PathProgramCache]: Analyzing trace with hash 717727145, now seen corresponding path program 1 times [2021-11-07 01:08:47,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:47,776 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2036222600] [2021-11-07 01:08:47,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:47,776 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:47,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:47,777 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:47,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 01:08:47,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:48,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:48,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:48,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:48,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:48,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:48,231 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:48,231 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2036222600] [2021-11-07 01:08:48,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2036222600] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:48,231 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:48,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-07 01:08:48,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247797774] [2021-11-07 01:08:48,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:48,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:48,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:48,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:48,233 INFO L87 Difference]: Start difference. First operand 319 states and 447 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:48,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:48,337 INFO L93 Difference]: Finished difference Result 632 states and 889 transitions. [2021-11-07 01:08:48,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:48,338 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-07 01:08:48,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:48,340 INFO L225 Difference]: With dead ends: 632 [2021-11-07 01:08:48,353 INFO L226 Difference]: Without dead ends: 324 [2021-11-07 01:08:48,354 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:08:48,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-07 01:08:48,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 324. [2021-11-07 01:08:48,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 1.4024767801857585) internal successors, (453), 323 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:48,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 453 transitions. [2021-11-07 01:08:48,390 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 453 transitions. Word has length 25 [2021-11-07 01:08:48,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:48,391 INFO L470 AbstractCegarLoop]: Abstraction has 324 states and 453 transitions. [2021-11-07 01:08:48,391 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:48,391 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 453 transitions. [2021-11-07 01:08:48,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-07 01:08:48,393 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:48,393 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:08:48,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:48,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:48,606 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:48,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:48,607 INFO L85 PathProgramCache]: Analyzing trace with hash 1524412699, now seen corresponding path program 1 times [2021-11-07 01:08:48,607 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:48,607 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1342555597] [2021-11-07 01:08:48,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:48,608 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:48,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:48,611 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:48,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-07 01:08:48,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:48,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:48,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:49,048 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:49,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:49,239 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:49,239 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:49,239 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1342555597] [2021-11-07 01:08:49,239 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1342555597] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:49,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [526750912] [2021-11-07 01:08:49,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:49,240 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:49,240 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:49,244 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:49,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (6)] Waiting until timeout for monitored process [2021-11-07 01:08:49,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:49,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 01:08:49,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:49,704 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:08:49,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:49,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:08:49,795 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [526750912] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:49,795 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:49,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 10 [2021-11-07 01:08:49,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703294794] [2021-11-07 01:08:49,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:49,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:49,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:49,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:08:49,797 INFO L87 Difference]: Start difference. First operand 324 states and 453 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:49,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:49,877 INFO L93 Difference]: Finished difference Result 636 states and 891 transitions. [2021-11-07 01:08:49,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:08:49,878 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-07 01:08:49,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:49,880 INFO L225 Difference]: With dead ends: 636 [2021-11-07 01:08:49,880 INFO L226 Difference]: Without dead ends: 323 [2021-11-07 01:08:49,882 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:08:49,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-11-07 01:08:49,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 323. [2021-11-07 01:08:49,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.3944099378881987) internal successors, (449), 322 states have internal predecessors, (449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:49,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 449 transitions. [2021-11-07 01:08:49,907 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 449 transitions. Word has length 33 [2021-11-07 01:08:49,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:49,907 INFO L470 AbstractCegarLoop]: Abstraction has 323 states and 449 transitions. [2021-11-07 01:08:49,908 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:49,908 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 449 transitions. [2021-11-07 01:08:49,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-07 01:08:49,911 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:49,911 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:08:49,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:50,123 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (6)] Ended with exit code 0 [2021-11-07 01:08:50,321 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:50,322 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:50,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:50,322 INFO L85 PathProgramCache]: Analyzing trace with hash -1936677014, now seen corresponding path program 1 times [2021-11-07 01:08:50,323 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:50,323 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1841769592] [2021-11-07 01:08:50,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:50,323 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:50,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:50,324 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:50,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-07 01:08:50,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:50,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:50,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:50,813 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:50,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:51,076 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 01:08:51,076 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:51,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1841769592] [2021-11-07 01:08:51,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1841769592] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:51,077 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [541230750] [2021-11-07 01:08:51,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:51,077 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:51,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:51,083 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:51,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-07 01:08:51,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:51,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:51,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:51,747 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:08:51,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:52,016 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:08:52,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [541230750] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:52,017 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:08:52,017 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 13 [2021-11-07 01:08:52,017 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786397112] [2021-11-07 01:08:52,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:08:52,018 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:52,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:08:52,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:08:52,019 INFO L87 Difference]: Start difference. First operand 323 states and 449 transitions. Second operand has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:52,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:52,292 INFO L93 Difference]: Finished difference Result 945 states and 1320 transitions. [2021-11-07 01:08:52,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:08:52,292 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-07 01:08:52,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:52,297 INFO L225 Difference]: With dead ends: 945 [2021-11-07 01:08:52,297 INFO L226 Difference]: Without dead ends: 629 [2021-11-07 01:08:52,298 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:08:52,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-11-07 01:08:52,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 617. [2021-11-07 01:08:52,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 617 states, 616 states have (on average 1.3977272727272727) internal successors, (861), 616 states have internal predecessors, (861), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:52,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 617 states to 617 states and 861 transitions. [2021-11-07 01:08:52,332 INFO L78 Accepts]: Start accepts. Automaton has 617 states and 861 transitions. Word has length 44 [2021-11-07 01:08:52,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:52,333 INFO L470 AbstractCegarLoop]: Abstraction has 617 states and 861 transitions. [2021-11-07 01:08:52,333 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:52,333 INFO L276 IsEmpty]: Start isEmpty. Operand 617 states and 861 transitions. [2021-11-07 01:08:52,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:08:52,339 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:52,339 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:08:52,351 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:52,551 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (7)] Ended with exit code 0 [2021-11-07 01:08:52,746 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:52,746 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:52,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:52,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1397398033, now seen corresponding path program 1 times [2021-11-07 01:08:52,747 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:52,748 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1606698569] [2021-11-07 01:08:52,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:52,748 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:52,748 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:52,749 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:52,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 01:08:53,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:53,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:08:53,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:53,319 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:08:53,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:53,547 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:08:53,547 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:53,548 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1606698569] [2021-11-07 01:08:53,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1606698569] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:53,548 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:08:53,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2021-11-07 01:08:53,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782075282] [2021-11-07 01:08:53,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:08:53,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:53,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:08:53,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:53,550 INFO L87 Difference]: Start difference. First operand 617 states and 861 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:53,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:53,641 INFO L93 Difference]: Finished difference Result 1136 states and 1589 transitions. [2021-11-07 01:08:53,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:08:53,641 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:08:53,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:53,645 INFO L225 Difference]: With dead ends: 1136 [2021-11-07 01:08:53,645 INFO L226 Difference]: Without dead ends: 530 [2021-11-07 01:08:53,646 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:08:53,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2021-11-07 01:08:53,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 485. [2021-11-07 01:08:53,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 1.4008264462809918) internal successors, (678), 484 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:53,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 678 transitions. [2021-11-07 01:08:53,680 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 678 transitions. Word has length 69 [2021-11-07 01:08:53,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:53,681 INFO L470 AbstractCegarLoop]: Abstraction has 485 states and 678 transitions. [2021-11-07 01:08:53,681 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:53,681 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 678 transitions. [2021-11-07 01:08:53,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-07 01:08:53,684 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:53,684 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:08:53,699 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Ended with exit code 0 [2021-11-07 01:08:53,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:53,902 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:53,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:53,903 INFO L85 PathProgramCache]: Analyzing trace with hash -266862051, now seen corresponding path program 2 times [2021-11-07 01:08:53,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:53,904 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [483590164] [2021-11-07 01:08:53,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:08:53,904 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:53,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:53,905 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:53,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 01:08:54,434 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:08:54,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:08:54,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:54,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:54,712 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:54,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:54,993 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:54,993 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:54,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [483590164] [2021-11-07 01:08:54,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [483590164] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:54,993 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [996457390] [2021-11-07 01:08:54,994 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:08:54,994 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:54,994 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:54,998 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:55,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-07 01:08:55,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:08:55,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:08:55,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:55,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:56,167 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:56,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:56,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [996457390] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:56,418 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942745215] [2021-11-07 01:08:56,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:08:56,419 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:08:56,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:08:56,422 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:08:56,429 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 01:08:56,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:08:56,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:08:56,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:08:56,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:57,135 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:08:57,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:57,311 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:08:57,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942745215] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:08:57,313 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 01:08:57,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5, 5, 5] total 10 [2021-11-07 01:08:57,314 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462013952] [2021-11-07 01:08:57,314 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:08:57,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:08:57,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:08:57,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:08:57,315 INFO L87 Difference]: Start difference. First operand 485 states and 678 transitions. Second operand has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:57,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:08:57,550 INFO L93 Difference]: Finished difference Result 2023 states and 2853 transitions. [2021-11-07 01:08:57,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:08:57,551 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-07 01:08:57,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:08:57,560 INFO L225 Difference]: With dead ends: 2023 [2021-11-07 01:08:57,561 INFO L226 Difference]: Without dead ends: 1562 [2021-11-07 01:08:57,562 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:08:57,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1562 states. [2021-11-07 01:08:57,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1562 to 493. [2021-11-07 01:08:57,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 1.3943089430894309) internal successors, (686), 492 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:57,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 686 transitions. [2021-11-07 01:08:57,611 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 686 transitions. Word has length 69 [2021-11-07 01:08:57,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:08:57,611 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 686 transitions. [2021-11-07 01:08:57,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.0) internal successors, (64), 4 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:08:57,612 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 686 transitions. [2021-11-07 01:08:57,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-07 01:08:57,613 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:08:57,614 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:08:57,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:57,842 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:58,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:08:58,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:08:58,219 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:08:58,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:08:58,220 INFO L85 PathProgramCache]: Analyzing trace with hash 436367918, now seen corresponding path program 1 times [2021-11-07 01:08:58,220 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:08:58,220 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1699356580] [2021-11-07 01:08:58,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:58,221 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:08:58,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:08:58,221 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:08:58,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 01:08:58,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:58,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:08:58,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:08:59,023 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:59,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:08:59,345 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:08:59,346 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:08:59,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1699356580] [2021-11-07 01:08:59,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1699356580] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:08:59,346 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [636042214] [2021-11-07 01:08:59,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:08:59,346 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:08:59,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:08:59,350 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:08:59,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-07 01:08:59,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:08:59,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 01:08:59,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:00,364 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:00,364 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:00,575 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:00,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [636042214] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:00,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:00,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 01:09:00,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80325645] [2021-11-07 01:09:00,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:09:00,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:00,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:09:00,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:09:00,578 INFO L87 Difference]: Start difference. First operand 493 states and 686 transitions. Second operand has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:01,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:01,578 INFO L93 Difference]: Finished difference Result 1875 states and 2643 transitions. [2021-11-07 01:09:01,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 01:09:01,579 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2021-11-07 01:09:01,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:01,588 INFO L225 Difference]: With dead ends: 1875 [2021-11-07 01:09:01,588 INFO L226 Difference]: Without dead ends: 1406 [2021-11-07 01:09:01,590 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:09:01,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1406 states. [2021-11-07 01:09:01,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1406 to 501. [2021-11-07 01:09:01,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 500 states have (on average 1.38) internal successors, (690), 500 states have internal predecessors, (690), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:01,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 690 transitions. [2021-11-07 01:09:01,652 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 690 transitions. Word has length 72 [2021-11-07 01:09:01,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:01,653 INFO L470 AbstractCegarLoop]: Abstraction has 501 states and 690 transitions. [2021-11-07 01:09:01,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.375) internal successors, (67), 8 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:01,653 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 690 transitions. [2021-11-07 01:09:01,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-07 01:09:01,657 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:01,657 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:01,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:01,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:02,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:02,076 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:02,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:02,077 INFO L85 PathProgramCache]: Analyzing trace with hash 224042803, now seen corresponding path program 1 times [2021-11-07 01:09:02,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:02,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1789770382] [2021-11-07 01:09:02,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:02,078 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:02,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:02,079 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:02,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-07 01:09:02,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:02,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:02,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:02,888 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:02,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:03,183 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:03,183 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:03,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1789770382] [2021-11-07 01:09:03,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1789770382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:03,183 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1121478657] [2021-11-07 01:09:03,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:03,183 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:03,184 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:03,184 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:03,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-07 01:09:04,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:04,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:04,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:04,312 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:04,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:04,544 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:04,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1121478657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:04,544 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089718926] [2021-11-07 01:09:04,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:04,544 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:09:04,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:09:04,546 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:09:04,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 01:09:05,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:05,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-07 01:09:05,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:05,890 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:05,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:06,864 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:06,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089718926] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:06,864 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 01:09:06,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10, 10] imperfect sequences [5, 5, 5, 5] total 24 [2021-11-07 01:09:06,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006405822] [2021-11-07 01:09:06,865 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:09:06,865 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:06,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:09:06,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=490, Unknown=0, NotChecked=0, Total=552 [2021-11-07 01:09:06,866 INFO L87 Difference]: Start difference. First operand 501 states and 690 transitions. Second operand has 18 states, 18 states have (on average 4.777777777777778) internal successors, (86), 18 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:10,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:10,232 INFO L93 Difference]: Finished difference Result 2353 states and 3315 transitions. [2021-11-07 01:09:10,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-07 01:09:10,233 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 4.777777777777778) internal successors, (86), 18 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-07 01:09:10,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:10,244 INFO L225 Difference]: With dead ends: 2353 [2021-11-07 01:09:10,245 INFO L226 Difference]: Without dead ends: 1876 [2021-11-07 01:09:10,247 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 422 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=264, Invalid=1142, Unknown=0, NotChecked=0, Total=1406 [2021-11-07 01:09:10,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1876 states. [2021-11-07 01:09:10,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1876 to 529. [2021-11-07 01:09:10,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 529 states, 528 states have (on average 1.3674242424242424) internal successors, (722), 528 states have internal predecessors, (722), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:10,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 529 states to 529 states and 722 transitions. [2021-11-07 01:09:10,339 INFO L78 Accepts]: Start accepts. Automaton has 529 states and 722 transitions. Word has length 74 [2021-11-07 01:09:10,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:10,340 INFO L470 AbstractCegarLoop]: Abstraction has 529 states and 722 transitions. [2021-11-07 01:09:10,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 4.777777777777778) internal successors, (86), 18 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:10,340 INFO L276 IsEmpty]: Start isEmpty. Operand 529 states and 722 transitions. [2021-11-07 01:09:10,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-07 01:09:10,342 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:10,342 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:10,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:10,557 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:10,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (16)] Ended with exit code 0 [2021-11-07 01:09:10,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:10,947 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:10,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:10,947 INFO L85 PathProgramCache]: Analyzing trace with hash -1066798690, now seen corresponding path program 1 times [2021-11-07 01:09:10,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:10,948 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [821583295] [2021-11-07 01:09:10,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:10,948 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:10,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:10,949 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:10,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Waiting until timeout for monitored process [2021-11-07 01:09:11,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:11,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:11,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:11,854 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:11,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:12,156 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:12,157 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:12,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [821583295] [2021-11-07 01:09:12,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [821583295] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:12,157 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1129673100] [2021-11-07 01:09:12,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:12,157 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:12,157 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:12,159 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:12,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Waiting until timeout for monitored process [2021-11-07 01:09:12,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:12,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:12,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:13,174 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:13,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:13,362 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:13,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1129673100] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:13,362 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:13,362 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-07 01:09:13,362 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371108143] [2021-11-07 01:09:13,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:09:13,363 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:13,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:09:13,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-07 01:09:13,364 INFO L87 Difference]: Start difference. First operand 529 states and 722 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:13,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:13,441 INFO L93 Difference]: Finished difference Result 1270 states and 1739 transitions. [2021-11-07 01:09:13,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:13,442 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2021-11-07 01:09:13,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:13,448 INFO L225 Difference]: With dead ends: 1270 [2021-11-07 01:09:13,448 INFO L226 Difference]: Without dead ends: 1004 [2021-11-07 01:09:13,449 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 321 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-07 01:09:13,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1004 states. [2021-11-07 01:09:13,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1004 to 533. [2021-11-07 01:09:13,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 533 states, 532 states have (on average 1.3646616541353382) internal successors, (726), 532 states have internal predecessors, (726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:13,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 533 states to 533 states and 726 transitions. [2021-11-07 01:09:13,516 INFO L78 Accepts]: Start accepts. Automaton has 533 states and 726 transitions. Word has length 83 [2021-11-07 01:09:13,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:13,517 INFO L470 AbstractCegarLoop]: Abstraction has 533 states and 726 transitions. [2021-11-07 01:09:13,517 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 3 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:13,517 INFO L276 IsEmpty]: Start isEmpty. Operand 533 states and 726 transitions. [2021-11-07 01:09:13,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-07 01:09:13,519 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:13,519 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:13,526 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (19)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:13,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (18)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:13,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:13,924 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:13,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:13,924 INFO L85 PathProgramCache]: Analyzing trace with hash -1191952163, now seen corresponding path program 1 times [2021-11-07 01:09:13,924 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:13,925 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2041988684] [2021-11-07 01:09:13,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:13,925 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:13,925 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:13,926 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:13,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Waiting until timeout for monitored process [2021-11-07 01:09:14,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:14,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:14,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:14,936 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:14,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:15,251 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:15,251 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:15,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2041988684] [2021-11-07 01:09:15,252 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2041988684] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:15,252 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [505726207] [2021-11-07 01:09:15,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:15,252 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:15,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:15,253 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:15,258 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Waiting until timeout for monitored process [2021-11-07 01:09:16,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:16,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 01:09:16,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:16,509 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:16,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:16,951 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:16,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [505726207] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:16,951 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:16,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 16 [2021-11-07 01:09:16,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452891794] [2021-11-07 01:09:16,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:09:16,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:16,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:09:16,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:09:16,953 INFO L87 Difference]: Start difference. First operand 533 states and 726 transitions. Second operand has 10 states, 10 states have (on average 8.6) internal successors, (86), 10 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:17,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:17,366 INFO L93 Difference]: Finished difference Result 1287 states and 1774 transitions. [2021-11-07 01:09:17,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:09:17,369 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 8.6) internal successors, (86), 10 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2021-11-07 01:09:17,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:17,374 INFO L225 Difference]: With dead ends: 1287 [2021-11-07 01:09:17,374 INFO L226 Difference]: Without dead ends: 778 [2021-11-07 01:09:17,376 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-11-07 01:09:17,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2021-11-07 01:09:17,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 517. [2021-11-07 01:09:17,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 516 states have (on average 1.3527131782945736) internal successors, (698), 516 states have internal predecessors, (698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:17,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 698 transitions. [2021-11-07 01:09:17,440 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 698 transitions. Word has length 85 [2021-11-07 01:09:17,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:17,440 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 698 transitions. [2021-11-07 01:09:17,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 8.6) internal successors, (86), 10 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:17,441 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 698 transitions. [2021-11-07 01:09:17,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:09:17,442 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:17,442 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:17,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (20)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:17,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (21)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:17,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:17,858 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:17,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:17,858 INFO L85 PathProgramCache]: Analyzing trace with hash -1532699763, now seen corresponding path program 1 times [2021-11-07 01:09:17,859 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:17,859 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [679137373] [2021-11-07 01:09:17,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:17,859 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:17,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:17,860 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:17,862 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Waiting until timeout for monitored process [2021-11-07 01:09:18,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:18,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:18,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:18,905 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:18,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:19,219 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:19,219 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:19,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [679137373] [2021-11-07 01:09:19,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [679137373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:19,219 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1598067235] [2021-11-07 01:09:19,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:19,219 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:19,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:19,220 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:19,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Waiting until timeout for monitored process [2021-11-07 01:09:20,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:20,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-07 01:09:20,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:20,396 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:20,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:20,574 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:20,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1598067235] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:20,575 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:20,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-07 01:09:20,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123670019] [2021-11-07 01:09:20,575 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:09:20,575 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:20,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:09:20,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:09:20,576 INFO L87 Difference]: Start difference. First operand 517 states and 698 transitions. Second operand has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:20,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:20,679 INFO L93 Difference]: Finished difference Result 1247 states and 1702 transitions. [2021-11-07 01:09:20,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:09:20,680 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-07 01:09:20,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:20,685 INFO L225 Difference]: With dead ends: 1247 [2021-11-07 01:09:20,685 INFO L226 Difference]: Without dead ends: 754 [2021-11-07 01:09:20,686 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:09:20,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-11-07 01:09:20,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 505. [2021-11-07 01:09:20,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 1.3373015873015872) internal successors, (674), 504 states have internal predecessors, (674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:20,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 674 transitions. [2021-11-07 01:09:20,759 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 674 transitions. Word has length 89 [2021-11-07 01:09:20,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:20,759 INFO L470 AbstractCegarLoop]: Abstraction has 505 states and 674 transitions. [2021-11-07 01:09:20,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.5) internal successors, (86), 4 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:20,759 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 674 transitions. [2021-11-07 01:09:20,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:09:20,761 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:20,761 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:20,784 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (22)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:20,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (23)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:21,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:21,180 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:21,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:21,181 INFO L85 PathProgramCache]: Analyzing trace with hash 969039757, now seen corresponding path program 1 times [2021-11-07 01:09:21,181 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:21,181 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1398496371] [2021-11-07 01:09:21,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:21,181 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:21,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:21,182 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:21,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Waiting until timeout for monitored process [2021-11-07 01:09:21,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:22,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:22,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:22,259 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:22,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:22,578 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 01:09:22,578 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:22,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1398496371] [2021-11-07 01:09:22,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1398496371] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:22,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [450931517] [2021-11-07 01:09:22,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:22,579 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:22,579 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:22,586 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:22,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Waiting until timeout for monitored process [2021-11-07 01:09:23,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:23,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 398 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:23,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:23,948 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:23,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:24,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [450931517] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:24,187 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:24,187 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-07 01:09:24,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694823242] [2021-11-07 01:09:24,188 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:09:24,188 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:24,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:09:24,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:09:24,189 INFO L87 Difference]: Start difference. First operand 505 states and 674 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:26,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:26,348 INFO L93 Difference]: Finished difference Result 990 states and 1326 transitions. [2021-11-07 01:09:26,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:09:26,350 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-07 01:09:26,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:26,353 INFO L225 Difference]: With dead ends: 990 [2021-11-07 01:09:26,353 INFO L226 Difference]: Without dead ends: 509 [2021-11-07 01:09:26,354 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 342 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:09:26,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-07 01:09:26,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 509. [2021-11-07 01:09:26,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 509 states, 508 states have (on average 1.3346456692913387) internal successors, (678), 508 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:26,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 509 states to 509 states and 678 transitions. [2021-11-07 01:09:26,417 INFO L78 Accepts]: Start accepts. Automaton has 509 states and 678 transitions. Word has length 89 [2021-11-07 01:09:26,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:26,417 INFO L470 AbstractCegarLoop]: Abstraction has 509 states and 678 transitions. [2021-11-07 01:09:26,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:26,418 INFO L276 IsEmpty]: Start isEmpty. Operand 509 states and 678 transitions. [2021-11-07 01:09:26,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-07 01:09:26,419 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:26,419 INFO L513 BasicCegarLoop]: trace histogram [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] [2021-11-07 01:09:26,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (24)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:26,641 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (25)] Ended with exit code 0 [2021-11-07 01:09:26,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:26,838 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:26,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:26,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1915423752, now seen corresponding path program 1 times [2021-11-07 01:09:26,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:26,839 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [330134101] [2021-11-07 01:09:26,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:26,839 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:26,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:26,840 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:26,842 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Waiting until timeout for monitored process [2021-11-07 01:09:27,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:28,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:28,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:28,290 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:09:28,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:28,590 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-07 01:09:28,590 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:28,590 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [330134101] [2021-11-07 01:09:28,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [330134101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:28,591 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [853067386] [2021-11-07 01:09:28,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:28,591 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:28,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:28,591 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:28,593 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Waiting until timeout for monitored process [2021-11-07 01:09:29,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:29,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:29,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:30,026 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:30,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:30,276 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:09:30,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [853067386] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:30,277 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:30,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-07 01:09:30,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757434259] [2021-11-07 01:09:30,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:09:30,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:30,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:09:30,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:09:30,278 INFO L87 Difference]: Start difference. First operand 509 states and 678 transitions. Second operand has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:32,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:32,532 INFO L93 Difference]: Finished difference Result 1235 states and 1643 transitions. [2021-11-07 01:09:32,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:09:32,533 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2021-11-07 01:09:32,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:32,537 INFO L225 Difference]: With dead ends: 1235 [2021-11-07 01:09:32,537 INFO L226 Difference]: Without dead ends: 750 [2021-11-07 01:09:32,538 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:09:32,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 750 states. [2021-11-07 01:09:32,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 750 to 517. [2021-11-07 01:09:32,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 517 states, 516 states have (on average 1.3294573643410852) internal successors, (686), 516 states have internal predecessors, (686), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:32,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 517 states to 517 states and 686 transitions. [2021-11-07 01:09:32,607 INFO L78 Accepts]: Start accepts. Automaton has 517 states and 686 transitions. Word has length 90 [2021-11-07 01:09:32,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:32,607 INFO L470 AbstractCegarLoop]: Abstraction has 517 states and 686 transitions. [2021-11-07 01:09:32,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.25) internal successors, (90), 8 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:32,608 INFO L276 IsEmpty]: Start isEmpty. Operand 517 states and 686 transitions. [2021-11-07 01:09:32,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-07 01:09:32,609 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:32,609 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 01:09:32,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (27)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:32,836 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (26)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:33,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:33,023 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:33,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:33,023 INFO L85 PathProgramCache]: Analyzing trace with hash 553107688, now seen corresponding path program 1 times [2021-11-07 01:09:33,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:33,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1965771441] [2021-11-07 01:09:33,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:33,024 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:33,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:33,025 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:33,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Waiting until timeout for monitored process [2021-11-07 01:09:34,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:34,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:34,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:34,353 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:34,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:34,669 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:34,670 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:34,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1965771441] [2021-11-07 01:09:34,670 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1965771441] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:34,670 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1351284782] [2021-11-07 01:09:34,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:34,670 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:34,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:34,671 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:34,675 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Waiting until timeout for monitored process [2021-11-07 01:09:36,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:36,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:36,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:36,515 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:36,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:36,845 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:36,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1351284782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:36,846 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817952318] [2021-11-07 01:09:36,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:36,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:09:36,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:09:36,847 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:09:36,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-07 01:09:38,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:38,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:38,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:38,491 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 01:09:38,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:39,019 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 01:09:39,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817952318] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:39,019 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 4 imperfect interpolant sequences. [2021-11-07 01:09:39,020 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5, 5, 5] total 14 [2021-11-07 01:09:39,020 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893953174] [2021-11-07 01:09:39,021 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:09:39,021 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:39,021 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:09:39,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-07 01:09:39,022 INFO L87 Difference]: Start difference. First operand 517 states and 686 transitions. Second operand has 8 states, 8 states have (on average 19.125) internal successors, (153), 8 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:40,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:40,241 INFO L93 Difference]: Finished difference Result 3996 states and 5320 transitions. [2021-11-07 01:09:40,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:09:40,242 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 19.125) internal successors, (153), 8 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2021-11-07 01:09:40,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:40,262 INFO L225 Difference]: With dead ends: 3996 [2021-11-07 01:09:40,262 INFO L226 Difference]: Without dead ends: 3736 [2021-11-07 01:09:40,264 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 534 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-11-07 01:09:40,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3736 states. [2021-11-07 01:09:40,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3736 to 1521. [2021-11-07 01:09:40,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1521 states, 1520 states have (on average 1.3368421052631578) internal successors, (2032), 1520 states have internal predecessors, (2032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:40,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1521 states to 1521 states and 2032 transitions. [2021-11-07 01:09:40,495 INFO L78 Accepts]: Start accepts. Automaton has 1521 states and 2032 transitions. Word has length 92 [2021-11-07 01:09:40,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:40,496 INFO L470 AbstractCegarLoop]: Abstraction has 1521 states and 2032 transitions. [2021-11-07 01:09:40,496 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 19.125) internal successors, (153), 8 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:40,496 INFO L276 IsEmpty]: Start isEmpty. Operand 1521 states and 2032 transitions. [2021-11-07 01:09:40,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-07 01:09:40,498 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:40,498 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 01:09:40,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:40,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (28)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:40,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (29)] Ended with exit code 0 [2021-11-07 01:09:41,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:41,122 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:41,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:41,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1163497015, now seen corresponding path program 1 times [2021-11-07 01:09:41,123 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:41,123 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1614491847] [2021-11-07 01:09:41,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:41,123 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:41,123 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:41,124 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:41,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-07 01:09:42,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:42,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:42,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:42,541 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:42,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:42,849 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:09:42,849 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:42,849 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1614491847] [2021-11-07 01:09:42,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1614491847] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:42,849 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [337372393] [2021-11-07 01:09:42,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:42,850 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:42,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:42,850 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:42,865 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-07 01:09:44,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:44,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-07 01:09:44,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:44,560 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 01:09:44,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:44,777 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 01:09:44,777 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [337372393] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:09:44,777 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 01:09:44,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-07 01:09:44,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131123472] [2021-11-07 01:09:44,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:09:44,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:44,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:09:44,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-07 01:09:44,779 INFO L87 Difference]: Start difference. First operand 1521 states and 2032 transitions. Second operand has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:45,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:45,546 INFO L93 Difference]: Finished difference Result 8074 states and 10731 transitions. [2021-11-07 01:09:45,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:09:45,548 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2021-11-07 01:09:45,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:45,572 INFO L225 Difference]: With dead ends: 8074 [2021-11-07 01:09:45,572 INFO L226 Difference]: Without dead ends: 6577 [2021-11-07 01:09:45,575 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-07 01:09:45,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6577 states. [2021-11-07 01:09:45,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6577 to 1615. [2021-11-07 01:09:45,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1615 states, 1614 states have (on average 1.3444857496902107) internal successors, (2170), 1614 states have internal predecessors, (2170), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:45,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1615 states to 1615 states and 2170 transitions. [2021-11-07 01:09:45,839 INFO L78 Accepts]: Start accepts. Automaton has 1615 states and 2170 transitions. Word has length 94 [2021-11-07 01:09:45,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:45,839 INFO L470 AbstractCegarLoop]: Abstraction has 1615 states and 2170 transitions. [2021-11-07 01:09:45,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.666666666666666) internal successors, (94), 6 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:45,840 INFO L276 IsEmpty]: Start isEmpty. Operand 1615 states and 2170 transitions. [2021-11-07 01:09:45,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-07 01:09:45,842 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:45,842 INFO L513 BasicCegarLoop]: trace histogram [3, 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] [2021-11-07 01:09:45,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:46,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:46,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 01:09:46,248 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:46,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:46,249 INFO L85 PathProgramCache]: Analyzing trace with hash -423137136, now seen corresponding path program 1 times [2021-11-07 01:09:46,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:46,249 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [536854244] [2021-11-07 01:09:46,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:46,250 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:46,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:46,250 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:46,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-07 01:09:47,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:47,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:47,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:47,754 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:47,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:48,078 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:48,078 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:09:48,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [536854244] [2021-11-07 01:09:48,078 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [536854244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:48,078 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1063185191] [2021-11-07 01:09:48,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:48,079 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:09:48,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:09:48,079 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:09:48,081 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-07 01:09:49,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:49,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:09:49,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:50,312 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:50,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:50,624 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-07 01:09:50,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1063185191] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:50,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395664911] [2021-11-07 01:09:50,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:09:50,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:09:50,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:09:50,625 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:09:50,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-07 01:09:52,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:09:52,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:09:52,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:09:52,550 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:09:52,551 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:09:53,159 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:09:53,160 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395664911] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:09:53,160 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:09:53,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 7, 7] total 18 [2021-11-07 01:09:53,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001940129] [2021-11-07 01:09:53,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-07 01:09:53,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:09:53,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-07 01:09:53,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-11-07 01:09:53,167 INFO L87 Difference]: Start difference. First operand 1615 states and 2170 transitions. Second operand has 18 states, 18 states have (on average 9.0) internal successors, (162), 18 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:58,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:09:58,006 INFO L93 Difference]: Finished difference Result 3599 states and 4875 transitions. [2021-11-07 01:09:58,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 01:09:58,007 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 9.0) internal successors, (162), 18 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-07 01:09:58,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:09:58,018 INFO L225 Difference]: With dead ends: 3599 [2021-11-07 01:09:58,018 INFO L226 Difference]: Without dead ends: 2008 [2021-11-07 01:09:58,020 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 592 GetRequests, 563 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=194, Invalid=736, Unknown=0, NotChecked=0, Total=930 [2021-11-07 01:09:58,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2008 states. [2021-11-07 01:09:58,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2008 to 1759. [2021-11-07 01:09:58,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1759 states, 1758 states have (on average 1.3367463026166098) internal successors, (2350), 1758 states have internal predecessors, (2350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:58,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1759 states to 1759 states and 2350 transitions. [2021-11-07 01:09:58,363 INFO L78 Accepts]: Start accepts. Automaton has 1759 states and 2350 transitions. Word has length 96 [2021-11-07 01:09:58,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:09:58,364 INFO L470 AbstractCegarLoop]: Abstraction has 1759 states and 2350 transitions. [2021-11-07 01:09:58,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 9.0) internal successors, (162), 18 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:09:58,364 INFO L276 IsEmpty]: Start isEmpty. Operand 1759 states and 2350 transitions. [2021-11-07 01:09:58,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-11-07 01:09:58,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:09:58,367 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:09:58,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:58,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (33)] Forceful destruction successful, exit code 0 [2021-11-07 01:09:58,804 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2021-11-07 01:09:58,976 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:09:58,976 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:09:58,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:09:58,976 INFO L85 PathProgramCache]: Analyzing trace with hash 2003631579, now seen corresponding path program 2 times [2021-11-07 01:09:58,977 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:09:58,977 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1848344336] [2021-11-07 01:09:58,977 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:09:58,977 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:09:58,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:09:58,978 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:09:58,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Waiting until timeout for monitored process [2021-11-07 01:10:00,657 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:10:00,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:10:00,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:10:00,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:01,143 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:10:01,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:01,792 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:10:01,793 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:01,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1848344336] [2021-11-07 01:10:01,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1848344336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:01,793 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [878646336] [2021-11-07 01:10:01,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:10:01,793 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:01,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:01,794 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:01,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Waiting until timeout for monitored process [2021-11-07 01:10:04,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:10:04,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:10:04,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:10:04,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:04,619 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:10:04,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:05,095 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:10:05,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [878646336] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:05,095 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1934071135] [2021-11-07 01:10:05,095 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 01:10:05,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:10:05,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:10:05,096 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:10:05,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-07 01:10:06,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 01:10:06,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:10:06,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:10:06,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-07 01:10:07,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:07,803 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-11-07 01:10:07,804 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1934071135] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:07,804 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 01:10:07,804 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 5, 5] total 22 [2021-11-07 01:10:07,804 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632881586] [2021-11-07 01:10:07,805 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-07 01:10:07,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 01:10:07,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-07 01:10:07,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-11-07 01:10:07,806 INFO L87 Difference]: Start difference. First operand 1759 states and 2350 transitions. Second operand has 22 states, 22 states have (on average 8.545454545454545) internal successors, (188), 22 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:13,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:10:13,675 INFO L93 Difference]: Finished difference Result 3710 states and 5006 transitions. [2021-11-07 01:10:13,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-07 01:10:13,676 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 8.545454545454545) internal successors, (188), 22 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2021-11-07 01:10:13,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:10:13,684 INFO L225 Difference]: With dead ends: 3710 [2021-11-07 01:10:13,684 INFO L226 Difference]: Without dead ends: 1975 [2021-11-07 01:10:13,686 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 658 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=198, Invalid=614, Unknown=0, NotChecked=0, Total=812 [2021-11-07 01:10:13,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1975 states. [2021-11-07 01:10:14,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1975 to 1975. [2021-11-07 01:10:14,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1975 states, 1974 states have (on average 1.3242147922998986) internal successors, (2614), 1974 states have internal predecessors, (2614), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:14,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1975 states to 1975 states and 2614 transitions. [2021-11-07 01:10:14,013 INFO L78 Accepts]: Start accepts. Automaton has 1975 states and 2614 transitions. Word has length 113 [2021-11-07 01:10:14,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:10:14,013 INFO L470 AbstractCegarLoop]: Abstraction has 1975 states and 2614 transitions. [2021-11-07 01:10:14,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 8.545454545454545) internal successors, (188), 22 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:10:14,014 INFO L276 IsEmpty]: Start isEmpty. Operand 1975 states and 2614 transitions. [2021-11-07 01:10:14,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-07 01:10:14,016 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:10:14,017 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:10:14,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (37)] Forceful destruction successful, exit code 0 [2021-11-07 01:10:14,243 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (36)] Ended with exit code 0 [2021-11-07 01:10:14,456 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2021-11-07 01:10:14,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:10:14,626 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:10:14,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:10:14,627 INFO L85 PathProgramCache]: Analyzing trace with hash -955851773, now seen corresponding path program 3 times [2021-11-07 01:10:14,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 01:10:14,627 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1659677309] [2021-11-07 01:10:14,628 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:10:14,628 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 01:10:14,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 01:10:14,629 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 01:10:14,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-07 01:10:17,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 01:10:17,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:10:17,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:10:17,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:18,249 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-07 01:10:18,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:18,929 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-07 01:10:18,930 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 01:10:18,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1659677309] [2021-11-07 01:10:18,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1659677309] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:18,930 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [431445807] [2021-11-07 01:10:18,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:10:18,930 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 01:10:18,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 01:10:18,942 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 01:10:18,943 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-07 01:10:26,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 01:10:26,340 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:10:26,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 480 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 01:10:26,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:10:26,746 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-07 01:10:26,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:10:27,125 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2021-11-07 01:10:27,126 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [431445807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:10:27,126 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302128962] [2021-11-07 01:10:27,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:10:27,126 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:10:27,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:10:27,127 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:10:27,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_85b42320-8f90-497a-b4c2-6174baac3aab/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process