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Note: Sorry if this is already known problem. I am not on the linux-kernel
mailing list, please Cc replies directly to me.
2.2.11 seems to be leaking memory somewhere (probably in the networking code)
for me. Seems to be 100% reproducible.
Running my server program (described later) on my dual P3 running 2.2.11
and bombing it with requests from 2 Sparcstations running Solaris 2.7
(each running 30 clients in parallel) for a while my machine seems to run
out of memory in kernel-space and OOM-kills every process which tries to
run. Situation doesn't get any better even when I kill the clients on the
Suns, only thing I can do is cold-reboot the machine. Kernel doesn't lock
up nor panic nor give any error messages.
Shift-scroll lock output from one of the "crashes":
Mem-info:
Free pages: 132kB
( Free: 33 (256 512 768)
21*4kB 6*8kB 0*16kB 0*32kB 0*64kB 0*128kB ...
2kB)
Swap cache: add 2398, delete 2398, find 11...
Free swap: 258752kB
65520 pages of RAM
1098 reserved pages
193 pages shared
0 pages swap cached
730 pages in file cache
730 pages in page cache
42 pages in page table cache
Buffer memory: 5240kB
Buffer heads: 5278
Buffer blocks: 5240
Buffer hashed: 5238
CLEAN: 5240 buffers, 43 used (last=5239...
Networking buffers in use : 76737...
Total network buffer allocations : 32635...
Total failed network buffer allocs : 94
IP fragment buffer size : 0
(This was typed in from a videocam-snapshot of the screen, right edge cut
some numbers in the middle.)
On the last try I was running "free" on 1sec intervals, the last output
before it got OOM-killed was this:
total used free shared buffers cached
Mem: 257688 255052 2636 1612 2188 4652
-/+ buffers/cache: 248212 9476
Swap: 259232 3276 255956
I couldn't get the full meminfo output from this run but got one line which
seemed quite interesting:
Networking buffers in use : 774499
Tested 2.2.10-ac12 on the same machine, worked fine. 2.2.10 on a single
processor P2, worked ok.
Description of the server program:
Mainloop listens on an UDP socket for requests and forks off children to
serve them.
Child processes work like this:
s = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
connect(s,remote_host_address);
f = open(file_path,O_RDONLY);
while (!eof(f))
{
read(f,data);
write(s,data);
}
close(s);
close(f);
All machines are connected to a relatively lightly loaded 100Mbit segment,
both Linux machines that I've tested this on have a 3Com 905B network adapter.
Kernel .config for the kernel that has trouble attached.
I can provide more information if necessary and run tests with different
kernels too.
-- Ilpo Ruotsalainen - <lonewolf@iki.fi> - http://www.iki.fi/lonewolf/---559023410-851401618-934483831=:1744 Content-Type: APPLICATION/octet-stream; name="config-2.2.11-gunbuster.gz" Content-Transfer-Encoding: BASE64 Content-ID: <Pine.GSO.4.10.9908122150310.1744@hutcs> Content-Description: Content-Disposition: attachment; filename="config-2.2.11-gunbuster.gz"
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