Memory leak in network buffers 2.1.125ac3

[Kurt Garloff]

Hi everyone,

I was wondering why my box was getting slower after some days of uptime.
Here's what I found:

Nov 11 01:46:30 kg1 kernel: Mem-info:
Nov 11 01:46:30 kg1 kernel: Free pages: 3276kB
Nov 11 01:46:30 kg1 kernel: ( Free: 819 (127 254 381)
Nov 11 01:46:30 kg1 kernel: 103*4kB 104*8kB 47*16kB 20*32kB 8*64kB 1*128kB = 3276kB)
Nov 11 01:46:30 kg1 kernel: Swap cache: add 900956/900956, delete 900704/900704, find 0/0
Nov 11 01:46:30 kg1 kernel: Free swap: 138016kB
Nov 11 01:46:30 kg1 kernel: 16368 pages of RAM
Nov 11 01:46:30 kg1 kernel: 571 reserved pages
Nov 11 01:46:30 kg1 kernel: 2720 pages shared
Nov 11 01:46:30 kg1 kernel: 252 pages swap cached
Nov 11 01:46:30 kg1 kernel: 34 pages in page table cache
Nov 11 01:46:30 kg1 kernel: Buffer memory: 7588kB
Nov 11 01:46:30 kg1 kernel: Buffer heads: 7640
Nov 11 01:46:30 kg1 kernel: Buffer blocks: 7588
Nov 11 01:46:30 kg1 kernel: CLEAN: 381 buffers, 20 used (last=20), 0 locked, 0 protected, 0 dirty
Nov 11 01:46:30 kg1 kernel: LOCKED: 4779 buffers, 133 used (last=2469), 0 locked, 0 protected, 0 dirty
Nov 11 01:46:30 kg1 kernel: DIRTY: 2405 buffers, 3 used (last=810), 0 locked, 0 protected, 2405 dirty
Nov 11 01:46:30 kg1 kernel: Networking buffers in use : 144
Nov 11 01:46:30 kg1 kernel: Total network buffer allocations : 16120011
Nov 11 01:46:30 kg1 kernel: Total failed network buffer allocs : 2
Nov 11 01:46:30 kg1 kernel: IP fragment buffer size : 0
root@kg1:~ # uptime
1:52am up 4 days, 8:28, 2 users, load average: 3.66, 3.85, 3.86

So , somewhere in the network code, memory is leaked at an average rate of
ca. 40 Bytes/sec. Huhh!
Gonna reboot now, because this box only has 64MB.

Anybody already found this one? Dave?
Has this been fixed in 2.1.127?

Kernel is 2.1.125ac3, SMP (Dual PII-350), w/ HZ = 400, scheduler bigpatch 4
from Rik and compiled with egcs-1.1a (-O2, -march=pentiumpro -fschedule-insns2).
No network, but normal sockets and ppp connections from time to time and a
loopback interface.

Anything to try?
--
Kurt Garloff <K.Ga...@ping.de> (Dortmund, FRG)
PGP key on http://student.physik.uni-dortmund.de/homepages/garloff
Unix IS user friendly - it's just selective about who its friends are!

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