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Jun 22, 2009, 10:23 AM
Post #1 of 2
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[Bug 43289] XBitHack full g+x returns zero sized response on If-Modified-Since
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https://issues.apache.org/bugzilla/show_bug.cgi?id=43289
David Nesting <david[at]fastolfe.net> changed:
What |Removed |Added
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Status|NEEDINFO |NEW
--- Comment #3 from David Nesting <david[at]fastolfe.net> 2009-06-22 10:23:31 PST ---
I'm seeing this with Debian's 2.2.11 build. I normally sit behind a squid
proxy that auto-retries, so this problem was being masked. I can reliably
reproduce it with a browser hitting the site directly. Occasionally the
requests DO succeed, but most fail. I've confirmed with tcpdump that the HTTP
server is closing the connection without sending a response.
The failures seem to be correlated only with index files with the XBitHack set.
My strace output looks essentially identical to the other poster's. Here's a
diff between a 'good' request and a 'bad' request:
getdents64(18, /* 0 entries */, 4096) = 0
close(18) = 0
open("/www/fastolfe.net/htdocs/2009/index.html", O_RDONLY|O_LARGEFILE) = 18
-mmap2(NULL, 13, PROT_READ, MAP_SHARED, 18, 0) = 0xb7f6c000
-writev(15, [{"HTTP/1.1 200 OK\r\nDate: Mon, 22 Ju"..., 342}, {"Test
content\n"..., 13}], 2) = 355
-munmap(0xb7f6c000, 13) = 0
-write(16, "216.239.45.4 - - - [.22/Jun/2009:0"..., 188) = 188
+close(18) = 0
+read(15, 0x82ddec8, 8000) = -1 EAGAIN (Resource temporarily
unavailable)
+write(16, "216.239.45.4 - - - [.22/Jun/2009:1"..., 187) = 187
shutdown(15, 1 /* send */) = 0
poll([{fd=15, events=POLLIN}], 1, 2000) = 1 ([{fd=15,
revents=POLLIN|POLLHUP}])
read(15, ""..., 512) = 0
close(15) = 0
read(7, 0xbf86fb57, 1) = -1 EAGAIN (Resource temporarily
unavailable)
-close(18) = 0
-semop(10059778, 0xb7f195d4, 1) = 0
-epoll_wait(13, {{EPOLLIN, {u32=137158752, u64=137158752}}}, 2, -1) = 1
+semop(10059778, 0xb7f195d4, 1
The bad request fails to mmap the index.html and fails to write a response
before closing the connection.
If I chmod g-x index.html, the file gets delivered reliably.
Nothing is logged to the error log, and the access log always reports a normal
304 response.
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