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Problem with swift3 and swift 1.7.6 with boto and HEAD, then PUT requests #27

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kostecky opened this issue Nov 11, 2012 · 3 comments
Closed

Problem with swift3 and swift 1.7.6 with boto and HEAD, then PUT requests #27

kostecky opened this issue Nov 11, 2012 · 3 comments

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@kostecky
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I'm having a very strange issue when using Django+Django-storages via S3Storage backend, which uses boto when connecting to swift 1.7.6+latest pull of your swift3 module. It works fine with swift 1.4.8. Here are the two cases. Can you comment on what is broken with either how swift is processing the responses from middleware?

Problem: In the broken case, boto does a HEAD /object to see if the key exists and gets a HTTP 404, which is correct. It then PUTS the object. Here's where the fun starts. In the working case (swift 1.4.8) it gets a HTTP 200 after the PUT has succeeded and that's all. In the broken case, it receives the error response body for NoSuchKey in the swift3 code and then gets the HTTP 200. This seems to confuse it and it just hangs.

--Straces--
WORKING CASE:
Using swift 1.4.8 (CentOS 6 RPM) which comes with the old swift3 module
recvfrom(6, "H", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "P", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ".", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "O", 1, 0, NULL, NULL) = 1
recvfrom(6, "K", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "y", 1, 0, NULL, NULL) = 1
recvfrom(6, "p", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "m", 1, 0, NULL, NULL) = 1
recvfrom(6, "l", 1, 0, NULL, NULL) = 1
recvfrom(6, ";", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "=", 1, 0, NULL, NULL) = 1
recvfrom(6, "U", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "L", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "g", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "E", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "g", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "X", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "I", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "D", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "i", 1, 0, NULL, NULL) = 1
recvfrom(6, ",", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "N", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "v", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "5", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "G", 1, 0, NULL, NULL) = 1
recvfrom(6, "M", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1

BROKEN CASE:
Using swift 1.7.6 (latest git pull) + swift3 (latest git pull)

Strace:
recvfrom(6, "<", 1, 0, NULL, NULL) = 1
recvfrom(6, "?", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "m", 1, 0, NULL, NULL) = 1
recvfrom(6, "l", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "v", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "i", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "=", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ".", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "i", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "g", 1, 0, NULL, NULL) = 1
recvfrom(6, "=", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, "U", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, """, 1, 0, NULL, NULL) = 1
recvfrom(6, "?", 1, 0, NULL, NULL) = 1
recvfrom(6, ">", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r\n NoSuchKey\r\n The resource you requested does not exist\r\n\r\n", 8192, 0, NULL, NULL) = 109
recvfrom(6, "HTTP/1.1 200 OK\r\nEtag: "a5737b361dab736fcc8f1c0bb66abe17"\r\nContent-Type: text/html; charset=UTF-8\r\nX-Trans-Id: tx58e5d25c2ab94a32bb701e97073d1c75\r\nContent-Length: 0\r\nDate: Fri, 09 Nov 2012 20:38:23 GMT\r\n\r\n", 8192, 0, NULL, NULL) = 205
recvfrom(6,

Thanks for any help!
@kostecky
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Author

Hi,

If there's anyone out there who can help me track down this issue, I'm actively trying to debug it. Please get in touch with me ASAP.

@kostecky
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Author

I should have included the HEAD response in both cases. Here they are, they're very similar. Again, it's the additional "NoSuchKey" error from the middleware that is getting read in from the file descriptor after the PUT (when it should, if anything, come after the HEAD request response, since it's associated with it.

Broken:

recvfrom(6, "H", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "P", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ".", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "N", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "u", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
mprotect(0x7f13bc1e6000, 4096, PROT_READ|PROT_WRITE) = 0
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "L", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "g", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "y", 1, 0, NULL, NULL) = 1
recvfrom(6, "p", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "m", 1, 0, NULL, NULL) = 1
recvfrom(6, "l", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "X", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "I", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "5", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "D", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "i", 1, 0, NULL, NULL) = 1
recvfrom(6, ",", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "N", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "v", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "G", 1, 0, NULL, NULL) = 1
recvfrom(6, "M", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1

WORKING:

recvfrom(6, "H", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "P", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ".", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "N", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "u", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "y", 1, 0, NULL, NULL) = 1
recvfrom(6, "p", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "/", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "m", 1, 0, NULL, NULL) = 1
recvfrom(6, "l", 1, 0, NULL, NULL) = 1
recvfrom(6, ";", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "c", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "=", 1, 0, NULL, NULL) = 1
recvfrom(6, "U", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "C", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "L", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "g", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "h", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "X", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "n", 1, 0, NULL, NULL) = 1
recvfrom(6, "s", 1, 0, NULL, NULL) = 1
recvfrom(6, "-", 1, 0, NULL, NULL) = 1
recvfrom(6, "I", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "x", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "5", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "5", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "3", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "f", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "d", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "b", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "8", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "6", 1, 0, NULL, NULL) = 1
recvfrom(6, "7", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "D", 1, 0, NULL, NULL) = 1
recvfrom(6, "a", 1, 0, NULL, NULL) = 1
recvfrom(6, "t", 1, 0, NULL, NULL) = 1
recvfrom(6, "e", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "F", 1, 0, NULL, NULL) = 1
recvfrom(6, "r", 1, 0, NULL, NULL) = 1
recvfrom(6, "i", 1, 0, NULL, NULL) = 1
recvfrom(6, ",", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "9", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "N", 1, 0, NULL, NULL) = 1
recvfrom(6, "o", 1, 0, NULL, NULL) = 1
recvfrom(6, "v", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "2", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "0", 1, 0, NULL, NULL) = 1
recvfrom(6, "1", 1, 0, NULL, NULL) = 1
recvfrom(6, ":", 1, 0, NULL, NULL) = 1
recvfrom(6, "4", 1, 0, NULL, NULL) = 1
recvfrom(6, "5", 1, 0, NULL, NULL) = 1
recvfrom(6, " ", 1, 0, NULL, NULL) = 1
recvfrom(6, "G", 1, 0, NULL, NULL) = 1
recvfrom(6, "M", 1, 0, NULL, NULL) = 1
recvfrom(6, "T", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1
recvfrom(6, "\r", 1, 0, NULL, NULL) = 1
recvfrom(6, "\n", 1, 0, NULL, NULL) = 1

@kostecky
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This was tracked down and fixed within swob @ https://review.openstack.org/#/c/19422/

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