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Stale DAG generated causing immediate regeneration #28

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jorisbontje opened this issue Apr 10, 2015 · 1 comment
Closed

Stale DAG generated causing immediate regeneration #28

jorisbontje opened this issue Apr 10, 2015 · 1 comment

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@jorisbontje
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Using geth (develop commit fc1d1f9), the newly generated DAG is flagged as stale right after it being completed; causing another regeneration to be triggered. I would expect that no staleness to happen and only 1 DAG generation to be sufficient.

Full logs:

Welcome to the FRONTIER
I0410 13:09:17.378095   11187 backend.go:180] Protocol Version: 60, Network Id: 0
I0410 13:09:17.379846   11187 chain_manager.go:186] Last block (#57346) 8be45fc7206a5afdefa8b3839bfeb0515827d6ac6769ef0611bb3eddec098fc7 TD=72784439970
I0410 13:09:17.718830   11187 ethash.go:94] Making cache
I0410 13:09:18.654124   11187 ethash.go:99] Took: 935.244142ms
I0410 13:09:18.659580   11187 cmd.go:116] Starting  Geth/v0.9.8/darwin/go1.4.2
I0410 13:09:18.659766   11187 server.go:164] Starting Server
I0410 13:09:19.280743   11187 nat.go:94] mapping error: no devices discovered
I0410 13:09:19.281099   11187 udp.go:157] Listening, enode://643e4d8208a852bed13dcead607c61f5491d16e42c9a4bdf7ab8c1d1768b894e694cc4b1a78ec34c39537338218b201f7f5e4cb09c7fd69bb0b19e76b6bc9c7c@[::]:30303
I0410 13:09:19.281349   11187 nat.go:94] mapping error: no devices discovered
I0410 13:09:19.281335   11187 server.go:266] Listening on [::]:30303
I0410 13:09:19.281569   11187 blockpool.go:265] Blockpool started
I0410 13:09:19.281658   11187 whisper.go:72] Whisper started
I0410 13:09:19.281730   11187 backend.go:383] Server started
I0410 13:09:20.301319   11187 ethash.go:94] Making cache
I0410 13:09:21.403573   11187 ethash.go:99] Took: 1.102227801s
I0410 13:09:21.403607   11187 ethash.go:198] Retrieving DAG
I0410 13:09:21.403641   11187 ethash.go:203] No DAG found. Generating new DAG in '/tmp/dag' (this takes a while)...
I0410 13:09:26.406739   11187 ethash.go:136] ... still generating DAG (5.003045356) ...
I0410 13:09:31.404477   11187 ethash.go:136] ... still generating DAG (10.000782487) ...
I0410 13:09:36.407034   11187 ethash.go:136] ... still generating DAG (15.003339022) ...
I0410 13:09:38.505930   11187 chain_manager.go:544] imported 170 block(s) 0 queued in 1.489448954s. #57515 [ba10a4cb / 0ffd8ead]
I0410 13:09:41.284214   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 2.77800654s. #57771 [3dadda69 / 4558c413]
I0410 13:09:41.405356   11187 ethash.go:136] ... still generating DAG (20.001661597) ...
I0410 13:09:42.295437   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.010993289s. #58027 [4afb184d / eeb3997b]
I0410 13:09:43.193584   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 897.864808ms. #58283 [b12358cf / 3b69f298]
I0410 13:09:44.213937   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.020095712s. #58539 [761b993b / ca4f961f]
I0410 13:09:45.085637   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 871.381531ms. #58795 [95258905 / da7ed1b8]
I0410 13:09:45.975898   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 889.994726ms. #59051 [a146b188 / 64ae1b0c]
I0410 13:09:46.406604   11187 ethash.go:136] ... still generating DAG (25.002910636) ...
I0410 13:09:46.867102   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 890.929919ms. #59307 [424739fb / 591c3935]
I0410 13:09:47.754477   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 887.047754ms. #59563 [138f7f9c / 619e3691]
I0410 13:09:48.663106   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 908.402605ms. #59819 [c9511426 / 79cf1abd]
I0410 13:09:49.335985   11187 ethash.go:94] Making cache
I0410 13:09:50.233732   11187 ethash.go:99] Took: 897.71736ms
I0410 13:09:50.514776   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.851433292s. #60075 [379b8f14 / 8bccff58]
I0410 13:09:51.404847   11187 ethash.go:136] ... still generating DAG (30.001155713) ...
I0410 13:09:51.516661   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.001635161s. #60331 [3f4106e1 / 35d2021d]
I0410 13:09:52.480543   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 963.619331ms. #60587 [31937c34 / b1ac9278]
I0410 13:09:53.467257   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 986.466838ms. #60843 [4ca29ed4 / 8258abe6]
I0410 13:09:54.440704   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 973.16776ms. #61099 [1c838b73 / 1870333f]
I0410 13:09:55.435017   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 993.950945ms. #61355 [d8f4a17d / 9b500914]
I0410 13:09:56.396171   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 960.89642ms. #61611 [15186ad4 / d8be7e11]
I0410 13:09:56.403866   11187 ethash.go:136] ... still generating DAG (35.000176577) ...
I0410 13:09:58.132360   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.73594385s. #61867 [ab71224c / 9fe35f37]
I0410 13:09:59.120999   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 988.266869ms. #62123 [46ff4b6e / c5e9dc72]
I0410 13:10:00.297502   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.17620363s. #62379 [9c1b1a63 / c8dc72ea]
I0410 13:10:01.262857   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 965.129722ms. #62635 [cd6089a3 / e6ef26ad]
I0410 13:10:01.406693   11187 ethash.go:136] ... still generating DAG (40.003000427) ...
I0410 13:10:02.242660   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 979.558969ms. #62891 [c4034ab2 / 16bd585a]
I0410 13:10:03.224733   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 981.852151ms. #63147 [2d5cf3de / 7e776da9]
I0410 13:10:04.214865   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 989.850865ms. #63403 [b16da481 / 29600bcb]
I0410 13:10:05.207679   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 992.559133ms. #63659 [541a3a1a / 9acc6762]
I0410 13:10:06.219982   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.01199924s. #63915 [bb858ab3 / 91475a87]
I0410 13:10:06.405234   11187 ethash.go:136] ... still generating DAG (45.001543377) ...
I0410 13:10:07.216912   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 996.682815ms. #64171 [f9b95064 / 78af7b9f]
I0410 13:10:08.947587   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.730348989s. #64427 [0fcd6a92 / b90f4e74]
I0410 13:10:10.930265   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.982460776s. #64683 [5b61c5bc / 8fdd0d9a]
I0410 13:10:11.403746   11187 ethash.go:136] ... still generating DAG (50.000054344) ...
I0410 13:10:11.957999   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.027521736s. #64939 [2dcfa535 / ff6ac911]
I0410 13:10:13.034314   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.076016904s. #65195 [714ac215 / 1030869f]
I0410 13:10:15.192237   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 2.157653337s. #65451 [26cbe1ac / 3a3c30e5]
I0410 13:10:16.404222   11187 ethash.go:136] ... still generating DAG (55.000529041) ...
I0410 13:10:17.064352   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 1.871860958s. #65707 [0752ad5d / 40c88976]
I0410 13:10:19.548593   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 2.483955139s. #65963 [5f02ae84 / 4b8514c0]
I0410 13:10:21.407355   11187 ethash.go:136] ... still generating DAG (60.003659764) ...
I0410 13:10:21.665823   11187 chain_manager.go:544] imported 256 block(s) 0 queued in 2.116877024s. #66219 [83a64b77 / 686ada38]
I0410 13:10:23.337991   11187 chain_manager.go:544] imported 257 block(s) 0 queued in 1.671835973s. #66476 [c4e8c6b2 / 42a4cc55]
I0410 13:10:23.338259   11187 chain_manager.go:480] INVALID block #66481 (fd6aa509)
I0410 13:10:23.338277   11187 chain_manager.go:481] Block's parent unknown 6e2b6e80883dec7c9115c76f7bf79c1fd138cdb21e4fc914f7c3fb3fbdcc291b
I0410 13:10:23.338292   11187 errors.go:82] [Blockpool] Invalid block: [Block's parent unknown 6e2b6e80883dec7c9115c76f7bf79c1fd138cdb21e4fc914f7c3fb3fbdcc291b]
2015/04/10 13:10:23 [Blockpool] invalid block 0e0a2c1435de9d1412c52adbe7a04421d6be94875224562b235a31f0ab13f64d
2015/04/10 13:10:23 [Blockpool] penalise peers 487611428e6c99a1 (hash), 487611428e6c99a1 (block)
I0410 13:10:26.403887   11187 ethash.go:136] ... still generating DAG (65.000193849) ...
I0410 13:10:31.406374   11187 ethash.go:136] ... still generating DAG (70.002680102) ...
I0410 13:10:36.405621   11187 ethash.go:136] ... still generating DAG (75.001928214) ...
I0410 13:10:41.404619   11187 ethash.go:136] ... still generating DAG (80.000926101) ...
I0410 13:10:46.406856   11187 ethash.go:136] ... still generating DAG (85.003161586) ...
I0410 13:10:46.742707   11187 chain_manager.go:544] imported 8 block(s) 0 queued in 159.762252ms. #66484 [c5fb40fc / 63aa99a0]
I0410 13:10:51.406064   11187 ethash.go:136] ... still generating DAG (90.002370069) ...
I0410 13:10:56.404695   11187 ethash.go:136] ... still generating DAG (95.000999267) ...
I0410 13:11:01.405593   11187 ethash.go:136] ... still generating DAG (100.001889499) ...
I0410 13:11:06.404483   11187 ethash.go:136] ... still generating DAG (105.000788781) ...
I0410 13:11:11.405020   11187 ethash.go:136] ... still generating DAG (110.001326854) ...
I0410 13:11:16.407163   11187 ethash.go:136] ... still generating DAG (115.003466484) ...
I0410 13:11:21.407098   11187 ethash.go:136] ... still generating DAG (120.003404059) ...
I0410 13:11:26.405073   11187 ethash.go:136] ... still generating DAG (125.001378886) ...
I0410 13:11:31.403765   11187 ethash.go:136] ... still generating DAG (130.000064002) ...
I0410 13:11:36.405563   11187 ethash.go:136] ... still generating DAG (135.001869248) ...
I0410 13:11:41.405060   11187 ethash.go:136] ... still generating DAG (140.001363434) ...
I0410 13:11:46.405077   11187 ethash.go:136] ... still generating DAG (145.001383489) ...
I0410 13:11:51.405639   11187 ethash.go:136] ... still generating DAG (150.001944266) ...
I0410 13:11:56.404138   11187 ethash.go:136] ... still generating DAG (155.000443499) ...
I0410 13:12:01.404584   11187 ethash.go:136] ... still generating DAG (160.000890683) ...
I0410 13:12:06.406231   11187 ethash.go:136] ... still generating DAG (165.00253699) ...
I0410 13:12:11.404211   11187 ethash.go:136] ... still generating DAG (170.000517108) ...
I0410 13:12:16.404577   11187 ethash.go:136] ... still generating DAG (175.000884651) ...
I0410 13:12:21.404878   11187 ethash.go:136] ... still generating DAG (180.001183905) ...
I0410 13:12:26.403760   11187 ethash.go:136] ... still generating DAG (185.00006847) ...
I0410 13:12:31.404805   11187 ethash.go:136] ... still generating DAG (190.001112138) ...
I0410 13:12:36.403998   11187 ethash.go:136] ... still generating DAG (195.000300959) ...
I0410 13:12:41.404801   11187 ethash.go:136] ... still generating DAG (200.001107936) ...
I0410 13:12:46.403781   11187 ethash.go:136] ... still generating DAG (205.000086963) ...
I0410 13:12:51.404405   11187 ethash.go:136] ... still generating DAG (210.000711869) ...
I0410 13:12:56.403774   11187 ethash.go:136] ... still generating DAG (215.000081669) ...
I0410 13:13:01.403986   11187 ethash.go:136] ... still generating DAG (220.000292721) ...
I0410 13:13:06.404488   11187 ethash.go:136] ... still generating DAG (225.000792413) ...
I0410 13:13:11.404725   11187 ethash.go:136] ... still generating DAG (230.001032121) ...
I0410 13:13:16.404162   11187 ethash.go:136] ... still generating DAG (235.000469203) ...
I0410 13:13:21.404561   11187 ethash.go:136] ... still generating DAG (240.000868305) ...
I0410 13:13:26.404033   11187 ethash.go:136] ... still generating DAG (245.00033528) ...
I0410 13:13:31.404097   11187 ethash.go:136] ... still generating DAG (250.000404628) ...
I0410 13:13:36.403783   11187 ethash.go:136] ... still generating DAG (255.000087036) ...
I0410 13:13:41.404471   11187 ethash.go:136] ... still generating DAG (260.000776728) ...
I0410 13:13:46.404186   11187 ethash.go:136] ... still generating DAG (265.000493537) ...
I0410 13:13:51.404535   11187 ethash.go:136] ... still generating DAG (270.000839551) ...
I0410 13:13:56.404003   11187 ethash.go:136] ... still generating DAG (275.000307039) ...
I0410 13:14:01.404490   11187 ethash.go:136] ... still generating DAG (280.000795644) ...
I0410 13:14:06.404230   11187 ethash.go:136] ... still generating DAG (285.000536063) ...
I0410 13:14:11.403895   11187 ethash.go:136] ... still generating DAG (290.000193935) ...
I0410 13:14:16.404815   11187 ethash.go:136] ... still generating DAG (295.001120182) ...
I0410 13:14:21.404579   11187 ethash.go:136] ... still generating DAG (300.000881449) ...
I0410 13:14:26.404006   11187 ethash.go:136] ... still generating DAG (305.000311946) ...
I0410 13:14:31.404797   11187 ethash.go:136] ... still generating DAG (310.001103908) ...
I0410 13:14:36.404375   11187 ethash.go:136] ... still generating DAG (315.000682531) ...
I0410 13:14:41.404763   11187 ethash.go:136] ... still generating DAG (320.001068339) ...
I0410 13:14:46.404198   11187 ethash.go:136] ... still generating DAG (325.000504508) ...
I0410 13:14:51.404204   11187 ethash.go:136] ... still generating DAG (330.000511482) ...
I0410 13:14:56.404083   11187 ethash.go:136] ... still generating DAG (335.000387582) ...
I0410 13:15:01.403803   11187 ethash.go:136] ... still generating DAG (340.000109373) ...
I0410 13:15:06.404187   11187 ethash.go:136] ... still generating DAG (345.000494401) ...
I0410 13:15:11.404749   11187 ethash.go:136] ... still generating DAG (350.001054251) ...
I0410 13:15:16.404647   11187 ethash.go:136] ... still generating DAG (355.000952182) ...
I0410 13:15:21.404450   11187 ethash.go:136] ... still generating DAG (360.000757082) ...
I0410 13:15:26.404732   11187 ethash.go:136] ... still generating DAG (365.001038369) ...
I0410 13:15:31.404417   11187 ethash.go:136] ... still generating DAG (370.00072256) ...
I0410 13:15:36.394374   11187 ethash.go:138] ... DAG generation completed ...
I0410 13:15:39.695902   11187 ethash.go:243] Took: 6m18.292281148s
I0410 13:15:39.715202   11187 worker.go:314] commit new work on block 66485 with 0 txs & 0 uncles
I0410 13:15:39.791429   11187 ethash.go:94] Making cache
I0410 13:15:40.733122   11187 ethash.go:99] Took: 941.662025ms
I0410 13:15:40.733154   11187 ethash.go:198] Retrieving DAG
I0410 13:15:42.956792   11187 ethash.go:221] DAG in '/tmp/dag' is stale. Generating new DAG (this takes a while)...
I0410 13:15:47.961026   11187 ethash.go:136] ... still generating DAG (5.004129081) ...
I0410 13:15:52.957061   11187 ethash.go:136] ... still generating DAG (10.00015064) ...
I0410 13:15:57.957225   11187 ethash.go:136] ... still generating DAG (15.00032753) ...
I0410 13:16:02.959108   11187 ethash.go:136] ... still generating DAG (20.002211787) ...
I0410 13:16:07.957681   11187 ethash.go:136] ... still generating DAG (25.000783114) ...
I0410 13:16:12.957238   11187 ethash.go:136] ... still generating DAG (30.000341044) ...
I0410 13:16:17.959675   11187 ethash.go:136] ... still generating DAG (35.002774079) ...
I0410 13:16:22.957269   11187 ethash.go:136] ... still generating DAG (40.00037278) ...
I0410 13:16:27.958990   11187 ethash.go:136] ... still generating DAG (45.002093501) ...
I0410 13:16:32.960746   11187 ethash.go:136] ... still generating DAG (50.00384482) ...
I0410 13:16:37.957171   11187 ethash.go:136] ... still generating DAG (55.00027258) ...
I0410 13:16:42.958092   11187 ethash.go:136] ... still generating DAG (60.001194505) ...
I0410 13:16:47.959810   11187 ethash.go:136] ... still generating DAG (65.002911692) ...
I0410 13:16:52.957651   11187 ethash.go:136] ... still generating DAG (70.000744781) ...
I0410 13:16:57.957628   11187 ethash.go:136] ... still generating DAG (75.000727501) ...
I0410 13:17:02.958688   11187 ethash.go:136] ... still generating DAG (80.001785787) ...
I0410 13:17:07.957231   11187 ethash.go:136] ... still generating DAG (85.000318873) ...
I0410 13:17:12.958116   11187 ethash.go:136] ... still generating DAG (90.001219351) ...
I0410 13:17:17.957537   11187 ethash.go:136] ... still generating DAG (95.000638398) ...
I0410 13:17:22.957377   11187 ethash.go:136] ... still generating DAG (100.000471432) ...
I0410 13:17:27.957623   11187 ethash.go:136] ... still generating DAG (105.000725879) ...
I0410 13:17:32.959763   11187 ethash.go:136] ... still generating DAG (110.002864159) ...
I0410 13:17:37.957228   11187 ethash.go:136] ... still generating DAG (115.000327769) ...
I0410 13:17:42.959249   11187 ethash.go:136] ... still generating DAG (120.002350666) ...
I0410 13:17:47.961931   11187 ethash.go:136] ... still generating DAG (125.005033716) ...
I0410 13:17:52.957614   11187 ethash.go:136] ... still generating DAG (130.00070955) ...
I0410 13:17:57.958102   11187 ethash.go:136] ... still generating DAG (135.001203794) ...
I0410 13:18:02.958013   11187 ethash.go:136] ... still generating DAG (140.001104057) ...
I0410 13:18:07.957391   11187 ethash.go:136] ... still generating DAG (145.000493908) ...
I0410 13:18:12.957098   11187 ethash.go:136] ... still generating DAG (150.000200194) ...
I0410 13:18:17.957493   11187 ethash.go:136] ... still generating DAG (155.000594212) ...
I0410 13:18:22.957018   11187 ethash.go:136] ... still generating DAG (160.000119456) ...
I0410 13:18:27.957397   11187 ethash.go:136] ... still generating DAG (165.00049905) ...
I0410 13:18:32.961457   11187 ethash.go:136] ... still generating DAG (170.004558368) ...
I0410 13:18:37.957127   11187 ethash.go:136] ... still generating DAG (175.000230212) ...
I0410 13:18:42.957887   11187 ethash.go:136] ... still generating DAG (180.000988222) ...
I0410 13:18:47.957252   11187 ethash.go:136] ... still generating DAG (185.000353691) ...
I0410 13:18:52.956999   11187 ethash.go:136] ... still generating DAG (190.00010146) ...
I0410 13:18:57.958784   11187 ethash.go:136] ... still generating DAG (195.001887162) ...
I0410 13:19:02.959349   11187 ethash.go:136] ... still generating DAG (200.002450369) ...
I0410 13:19:07.957348   11187 ethash.go:136] ... still generating DAG (205.000450332) ...
I0410 13:19:12.957553   11187 ethash.go:136] ... still generating DAG (210.000652405) ...
I0410 13:19:17.958218   11187 ethash.go:136] ... still generating DAG (215.001321313) ...
I0410 13:19:22.957032   11187 ethash.go:136] ... still generating DAG (220.000134133) ...
I0410 13:19:27.958131   11187 ethash.go:136] ... still generating DAG (225.00123305) ...
I0410 13:19:32.960438   11187 ethash.go:136] ... still generating DAG (230.00354206) ...
I0410 13:19:37.957569   11187 ethash.go:136] ... still generating DAG (235.000671334) ...
I0410 13:19:42.959116   11187 ethash.go:136] ... still generating DAG (240.002219419) ...
I0410 13:19:47.958325   11187 ethash.go:136] ... still generating DAG (245.001427059) ...
I0410 13:19:52.957359   11187 ethash.go:136] ... still generating DAG (250.000460169) ...
I0410 13:19:57.957493   11187 ethash.go:136] ... still generating DAG (255.000580584) ...
I0410 13:20:02.958449   11187 ethash.go:136] ... still generating DAG (260.001552279) ...
I0410 13:20:07.957358   11187 ethash.go:136] ... still generating DAG (265.0004613) ...
I0410 13:20:12.958703   11187 ethash.go:136] ... still generating DAG (270.001803993) ...
I0410 13:20:17.961947   11187 ethash.go:136] ... still generating DAG (275.005044037) ...
I0410 13:20:22.957558   11187 ethash.go:136] ... still generating DAG (280.000659476) ...
I0410 13:20:27.957559   11187 ethash.go:136] ... still generating DAG (285.00066114) ...
I0410 13:20:32.959842   11187 ethash.go:136] ... still generating DAG (290.002944041) ...
I0410 13:20:37.957616   11187 ethash.go:136] ... still generating DAG (295.000716625) ...
I0410 13:20:42.959235   11187 ethash.go:136] ... still generating DAG (300.002319082) ...
I0410 13:20:47.959442   11187 ethash.go:136] ... still generating DAG (305.002543494) ...
I0410 13:20:52.957340   11187 ethash.go:136] ... still generating DAG (310.000441424) ...
I0410 13:20:57.958807   11187 ethash.go:136] ... still generating DAG (315.001910004) ...
I0410 13:21:02.958875   11187 ethash.go:136] ... still generating DAG (320.001978041) ...
I0410 13:21:07.957340   11187 ethash.go:136] ... still generating DAG (325.000442502) ...
I0410 13:21:12.958356   11187 ethash.go:136] ... still generating DAG (330.00145741) ...
I0410 13:21:17.959081   11187 ethash.go:136] ... still generating DAG (335.002182609) ...
I0410 13:21:22.957381   11187 ethash.go:136] ... still generating DAG (340.000484321) ...
I0410 13:21:27.957972   11187 ethash.go:136] ... still generating DAG (345.001074666) ...
I0410 13:21:32.958111   11187 ethash.go:136] ... still generating DAG (350.001210183) ...
I0410 13:21:37.957127   11187 ethash.go:136] ... still generating DAG (355.000228426) ...
I0410 13:21:42.957596   11187 ethash.go:136] ... still generating DAG (360.000697576) ...
I0410 13:21:47.958315   11187 ethash.go:136] ... still generating DAG (365.001419217) ...
I0410 13:21:52.957728   11187 ethash.go:136] ... still generating DAG (370.00083073) ...
I0410 13:21:57.957119   11187 ethash.go:136] ... still generating DAG (375.000222509) ...
I0410 13:22:02.146650   11187 ethash.go:138] ... DAG generation completed ...
I0410 13:22:05.112140   11187 ethash.go:243] Took: 6m24.37896945s
I0410 13:22:35.999887   11187 chain_manager.go:544] imported 1 block(s) 0 queued in 4.113995ms. #66485 [aeec6d34 / aeec6d34]
I0410 13:22:35.999924   11187 worker.go:204] 🔨 Mined block #66485
I0410 13:22:36.000381   11187 worker.go:314] commit new work on block 66486 with 0 txs & 0 uncles
@obscuren
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This is caused because you regenerated your DAG before the 59.999th block. Once the DAG was done generating it actually became stale and had to create another DAG for the 60.000+ epoch (3rd one).

Someone suggested don't mine until you're caught up. See my answer here ethereum/go-ethereum#684

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@jorisbontje @obscuren