141 lines
8.1 KiB
Markdown
141 lines
8.1 KiB
Markdown
Occasionally, clicking on a link in the webapp will hang. When this
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happens, which has only been seen in Chromium so far, the tab will spin
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forever, without anything loading. Other tabs can be opened with
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middle-click on links in the webapp, and work fine. Stopping and reloading
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in the tab tends to hang again, although eventually this will clear the
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hang up.
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My best procedure to replicate this, about 25% of the time:
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* have 2 large files and a libreoffice spreadsheet
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* start webapp, make repository
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* open file browser using button in webapp
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* move files into repository
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* make media subdir; move media into it
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* open spreadsheet, modify, save
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* click on New Repository button for the hang
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Running recordmydesktop at the same time may also help.. Or giving a
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presentation in Australia. :/
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-------
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Hypotheses:
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* Warp's slowloris protection could be triggering. Possibly by the
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repeated hits to update the alerts? I added a settingsOnException handler
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that logs all exceptions, and ThreadKilled is happening several times.
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The only place in Warp that kills threads is due to a timeout installed
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for that.
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**Verified** Bug filed upstream: <https://github.com/yesodweb/wai/issues/146>
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** workaround in place **
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* Something deep in git-annex, such as the inotidy code, could be
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preventing a web server thread from running. But then why do other
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tabs and other web browsers work while it's stuck?
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It would have to affect only 1 thread.
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-------
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I captured a clean protocol dump of this happening. It includes only the
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final, hanging http request and subsequent traffic, not the setup.
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We can see the web browser send a request. The server ACKs it at the TCP
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level, but never sends any reply. The web browser continues sending TCP
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keep-alive packets, which are acked by the server. This continued as long
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as the browser tab was left open.
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Question: Did the browser send a complete & valid request? The last part
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sent is a cookie and "\r\n\r\n".. So it seems complete. Unless warp is
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expecting a request body?
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<pre>
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17:22:30.533079 IP localhost.localdomain.53239 > localhost.localdomain.45836: Flags [P.], seq 4237976899:4237977772, ack 2608808926, win 2048, options [nop,nop,TS val 4895706 ecr 4885760], length 873
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0x0000: 4500 039d be84 4000 4006 7ad4 7f00 0001 E.....@.@.z.....
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0x0010: 7f00 0001 cff7 b30c fc9a 6543 9b7f 43de ..........eC..C.
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0x0020: 8018 0800 0192 0000 0101 080a 004a b3da .............J..
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0x0030: 004a 8d00 4745 5420 2f63 6f6e 6669 672f .J..GET./config/
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0x0040: 7265 706f 7369 746f 7279 3f61 7574 683d repository?auth=
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0x0050: 6437 6266 3037 3438 6663 3863 3031 3965 d7bf0748fc8c019e
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0x0060: 6230 3966 3530 3631 6164 6663 3861 3563 b09f5061adfc8a5c
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0x0070: 3430 3437 3633 6562 3736 6630 6163 3533 404763eb76f0ac53
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0x0080: 3663 3362 6230 3066 3835 6663 6361 3233 6c3bb00f85fcca23
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0x0090: 6235 3639 3764 3332 3464 3737 3930 3063 b5697d324d77900c
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0x00a0: 3739 3532 6430 6165 3235 3166 6331 6337 7952d0ae251fc1c7
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0x00b0: 3532 3632 6330 3233 6265 3936 3066 3563 5262c023be960f5c
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0x00c0: 3364 6135 6532 6262 6234 3639 3863 3035 3da5e2bbb4698c05
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0x00d0: 2048 5454 502f 312e 310d 0a48 6f73 743a .HTTP/1.1..Host:
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0x00e0: 2031 3237 2e30 2e30 2e31 3a34 3538 3336 .127.0.0.1:45836
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0x00f0: 0d0a 436f 6e6e 6563 7469 6f6e 3a20 6b65 ..Connection:.ke
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0x0100: 6570 2d61 6c69 7665 0d0a 4163 6365 7074 ep-alive..Accept
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0x0110: 3a20 7465 7874 2f68 746d 6c2c 6170 706c :.text/html,appl
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0x0120: 6963 6174 696f 6e2f 7868 746d 6c2b 786d ication/xhtml+xm
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0x0130: 6c2c 6170 706c 6963 6174 696f 6e2f 786d l,application/xm
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0x0140: 6c3b 713d 302e 392c 2a2f 2a3b 713d 302e l;q=0.9,*/*;q=0.
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0x0150: 380d 0a55 7365 722d 4167 656e 743a 204d 8..User-Agent:.M
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0x0160: 6f7a 696c 6c61 2f35 2e30 2028 5831 313b ozilla/5.0.(X11;
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0x0170: 204c 696e 7578 2069 3638 3629 2041 7070 .Linux.i686).App
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0x0180: 6c65 5765 624b 6974 2f35 3337 2e31 3720 leWebKit/537.17.
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0x0190: 284b 4854 4d4c 2c20 6c69 6b65 2047 6563 (KHTML,.like.Gec
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0x01a0: 6b6f 2920 4368 726f 6d65 2f32 342e 302e ko).Chrome/24.0.
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0x01b0: 3133 3132 2e36 3820 5361 6661 7269 2f35 1312.68.Safari/5
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0x01c0: 3337 2e31 370d 0a52 6566 6572 6572 3a20 37.17..Referer:.
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0x01d0: 6874 7470 3a2f 2f31 3237 2e30 2e30 2e31 http://127.0.0.1
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0x01e0: 3a34 3538 3336 2f3f 6175 7468 3d64 3762 :45836/?auth=d7b
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0x01f0: 6630 3734 3866 6338 6330 3139 6562 3039 f0748fc8c019eb09
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0x0200: 6635 3036 3161 6466 6338 6135 6334 3034 f5061adfc8a5c404
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0x0210: 3736 3365 6237 3666 3061 6335 3336 6333 763eb76f0ac536c3
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0x0220: 6262 3030 6638 3566 6363 6132 3362 3536 bb00f85fcca23b56
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0x0230: 3937 6433 3234 6437 3739 3030 6337 3935 97d324d77900c795
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0x0240: 3264 3061 6532 3531 6663 3163 3735 3236 2d0ae251fc1c7526
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0x0250: 3263 3032 3362 6539 3630 6635 6333 6461 2c023be960f5c3da
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0x0260: 3565 3262 6262 3436 3938 6330 350d 0a41 5e2bbb4698c05..A
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0x0270: 6363 6570 742d 456e 636f 6469 6e67 3a20 ccept-Encoding:.
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0x0280: 677a 6970 2c64 6566 6c61 7465 2c73 6463 gzip,deflate,sdc
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0x0290: 680d 0a41 6363 6570 742d 4c61 6e67 7561 h..Accept-Langua
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0x02a0: 6765 3a20 656e 2d55 532c 656e 3b71 3d30 ge:.en-US,en;q=0
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0x02b0: 2e38 0d0a 4163 6365 7074 2d43 6861 7273 .8..Accept-Chars
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0x02c0: 6574 3a20 4953 4f2d 3838 3539 2d31 2c75 et:.ISO-8859-1,u
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0x02d0: 7466 2d38 3b71 3d30 2e37 2c2a 3b71 3d30 tf-8;q=0.7,*;q=0
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0x02e0: 2e33 0d0a 436f 6f6b 6965 3a20 5f53 4553 .3..Cookie:._SES
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0x02f0: 5349 4f4e 3d45 3363 7455 496c 7341 5451 SION=E3ctUIlsATQ
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0x0300: 3631 694c 6d54 6954 7131 6f37 6465 7830 61iLmTiTq1o7dex0
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0x0310: 3361 6f57 3049 4b63 7663 467a 5838 4344 3aoW0IKcvcFzX8CD
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0x0320: 5432 7666 4b31 6c42 416d 6279 3166 764f T2vfK1lBAmby1fvO
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0x0330: 4643 7952 7863 6f5a 6277 5633 6a4b 4971 FCyRxcoZbwV3jKIq
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0x0340: 6b35 6958 4674 7557 5261 6b48 6944 6132 k5iXFtuWRakHiDa2
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0x0350: 7769 3075 2f53 6430 5a49 7a75 4464 7947 wi0u/Sd0ZIzuDdyG
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0x0360: 774f 6a31 7838 3130 356a 772f 5a2b 355a wOj1x8105jw/Z+5Z
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0x0370: 6f4b 6f48 396e 6779 6e4b 5366 5839 742f oKoH9ngynKSfX9t/
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0x0380: 6862 4b79 435a 6966 7739 4148 3053 6d4b hbKyCZifw9AH0SmK
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0x0390: 436e 4c38 5358 513d 3d0d 0a0d 0a CnL8SXQ==....
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17:22:30.571152 IP localhost.localdomain.45836 > localhost.localdomain.53239: Flags [.], ack 873, win 2048, options [nop,nop,TS val 4895716 ecr 4895706], length 0
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0x0000: 4500 0034 f15b 4000 4006 4b66 7f00 0001 E..4.[@.@.Kf....
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0x0010: 7f00 0001 b30c cff7 9b7f 43de fc9a 68ac ..........C...h.
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0x0020: 8010 0800 fe28 0000 0101 080a 004a b3e4 .....(.......J..
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0x0030: 004a b3da .J..
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17:22:35.803152 IP localhost.localdomain.53240 > localhost.localdomain.45836: Flags [.], ack 2157632553, win 2048, options [nop,nop,TS val 4897024 ecr 4885760], length 0
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0x0000: 4500 0034 3a63 4000 4006 025f 7f00 0001 E..4:c@.@.._....
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0x0010: 7f00 0001 cff8 b30c 7533 e963 809a dc29 ........u3.c...)
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0x0020: 8010 0800 fe28 0000 0101 080a 004a b900 .....(.......J..
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0x0030: 004a 8d00 .J..
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17:22:35.803213 IP localhost.localdomain.45836 > localhost.localdomain.53240: Flags [.], ack 1, win 2048, options [nop,nop,TS val 4897024 ecr 4840696], length 0
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0x0000: 4500 0034 10e5 4000 4006 2bdd 7f00 0001 E..4..@.@.+.....
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0x0010: 7f00 0001 b30c cff8 809a dc29 7533 e964 ...........)u3.d
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0x0020: 8010 0800 fe28 0000 0101 080a 004a b900 .....(.......J..
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0x0030: 0049 dcf8 .I..
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17:23:15.611193 IP localhost.localdomain.53239 > localhost.localdomain.45836: Flags [.], ack 1, win 2048, options [nop,nop,TS val 4906976 ecr 4895716], length 0
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0x0000: 4500 0034 be85 4000 4006 7e3c 7f00 0001 E..4..@.@.~<....
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0x0010: 7f00 0001 cff7 b30c fc9a 68ab 9b7f 43de ..........h...C.
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0x0020: 8010 0800 fe28 0000 0101 080a 004a dfe0 .....(.......J..
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0x0030: 004a b3e4 .J..
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17:23:15.611290 IP localhost.localdomain.45836 > localhost.localdomain.53239: Flags [.], ack 873, win 2048, options [nop,nop,TS val 4906976 ecr 4895706], length 0
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0x0000: 4500 0034 f15c 4000 4006 4b65 7f00 0001 E..4.\@.@.Ke....
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0x0010: 7f00 0001 b30c cff7 9b7f 43de fc9a 68ac ..........C...h.
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0x0020: 8010 0800 fe28 0000 0101 080a 004a dfe0 .....(.......J..
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0x0030: 004a b3da .J..
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</pre>
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