#16099: Development web server sometimes hangs with Chrome
-------------------------------------+-------------------------------------
Reporter: jseims@… | Owner: nobody
Type: Bug | Status: reopened
Milestone: | Component: HTTP handling
Version: 1.3 | Severity: Normal
Resolution: | Keywords:
Triage Stage: Design | Has patch: 0
decision needed | Needs tests: 0
Needs documentation: 0 | Easy pickings: 0
Patch needs improvement: 0 |
UI/UX: 0 |
-------------------------------------+-------------------------------------
Comment (by slacy):
I'm using Chrome 12.0.742.60 beta on Ubuntu 11.04 and can reproduce this
easily by starting a totally blank Django project, and attempting to visit
"http://localhost:8000/"; using Chrome's Incognito mode.
I've looked at the strace, and the hang is right after the accept() of the
new connection. The HTTP server does a recvfrom() on the new socket, and
Chrome never seems to write the request.
The sequence looks like this (from "strace -T -f -o /tmp/strace.out python
./manage.py runserver --noreload": Each call is annotated with it's
runtime in seconds in <>'s, so take a look at the 1st call to recvfrom()
which takes 60 seconds to complete.
{{{
[...]
17271 select(4, [3], [], [], {0, 500000}) = 0 (Timeout) <0.500664>
17271 select(4, [3], [], [], {0, 500000}) = 0 (Timeout) <0.500648>
17271 select(4, [3], [], [], {0, 500000}) = 1 (in [3], left {0, 285305})
<0.214843>
17271 accept(3, {sa_family=AF_INET, sin_port=htons(49463),
sin_addr=inet_addr("127.0.0.1")}, [16]) = 4 <0.000059>
17271 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon
echo ...}) = 0 <0.000075>
17271 recvfrom(4, "", 8192, 0, NULL, NULL) = 0 <60.004065>
17271 shutdown(4, 1 /* send */) = 0 <0.000145>
17271 close(4) = 0 <0.000107>
17271 select(4, [3], [], [], {0, 500000}) = 1 (in [3], left {0, 499996})
<0.000081>
17271 accept(3, {sa_family=AF_INET, sin_port=htons(49464),
sin_addr=inet_addr("127.0.0.1")}, [16]) = 4 <0.000078>
17271 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon
echo ...}) = 0 <0.000081>
17271 recvfrom(4, "", 8192, 0, NULL, NULL) = 0 <0.000033>
17271 shutdown(4, 1 /* send */) = 0 <0.000099>
17271 close(4) = 0 <0.000027>
17271 select(4, [3], [], [], {0, 500000}) = 1 (in [3], left {0, 499997})
<0.000018>
17271 accept(3, {sa_family=AF_INET, sin_port=htons(49465),
sin_addr=inet_addr("127.0.0.1")}, [16]) = 4 <0.000023>
17271 ioctl(1, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon
echo ...}) = 0 <0.000014>
17271 recvfrom(4, "GET / HTTP/1.1\r\nHost: localhost:8000\r\nConnection:
keep-alive\r\nCache-Control: max-age=0\r\nUser-Agent: Mozilla/5.0 (X11;
Linux x86_64) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.60
Safari/534.30\r\nAccept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-
Encoding: gzip,deflate,sdch\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-
Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n\r\n", 8192, 0, NULL, NULL) =
397 <0.000022>
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/16099#comment:8>
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