Hello!
With Apache 2.2.6 (the prefork mpm, on Debian 'SID') i'm seeing weird
behaviour when a (large) download is cancelled by a visitor.
Scenario: User browses to my site, clicks a link to a 1.5G zipfile,
realises it will take ages to download and clicks 'cancel download',
which results in an Apache process eating up ~99% CPU-time and hogging
the system.
Strace shows:
30672 writev(79, [{"1fa0\r\n", 6}, {"\270Q\34"..., 8096}, {"\r\n", 2}], 3) = -1
EPIPE (Broken pipe)
30672 --- SIGPIPE (Broken pipe) @ 0 (0) ---
30672 writev(79, [{"1fa0\r\n", 6}, {"\235:\235"..., 8096}, {"\r\n", 2}], 3) =
-1 EPIPE (Broken pipe)
30672 --- SIGPIPE (Broken pipe) @ 0 (0) ---
30672 writev(79, [{"1fa0\r\n", 6}, {"\241\237"..., 8096}, {"\r\n", 2}], 3) = -1
EPIPE (Broken pipe)
30672 --- SIGPIPE (Broken pipe) @ 0 (0) ---
In a continous loop. This happens for each and every request that is
cancelled, so looping apache processes accumulate at a fast rate on a
busy site. While smaller files make processes loop less longer, this
large file poses a problem as it takes some time to writev() 1.5G and
processing the SIGPIPE's.
Why exactly does Apache not stop sending data after receiving a SIGPIPE? ;-)
-Sndr.
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