2.4.20-preempt memory leak?

Cesar Eduardo Barros (cesarb@nitnet.com.br)
Sun, 13 Apr 2003 18:32:57 -0300

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After running "find / -type f -xdev -print0 | xargs -0 sha1sum" a couple
of times in a ext2 filesystem with 17 gigabytes of assorted stuff in it
(the kind of mess one would find in a typical /home) and in 90+ CDs, I
noticed the memory was running low (I have 128M of main memory and two
swapfiles of 128M each, both in the filesystem mentioned above). Both
swapfiles were full, and the cached+buffers+free was getting lower each
time.

I decided to reboot to clear whatever was happening. At the end of the
shutdown (when it does the swapoff -a), the system ran out of memory:

Out of Memory: Killed process 21619 (rc).
Out of Memory: Killed process 21854 (S40umountfs).
Out of Memory: Killed process 21858 (init).
Out of Memory: Killed process 21857 (swapoff).

This shouldn't have happened since everything was already killed by
killall5.

I got dropped to sulogin (instead of it rebooting) and copied some
information from /proc before doing a forced umount (and trying to do
another swapoff -a by hand, with the same results). e2fsck found no
errors after rebooting (I did a touch /forcefsck just in case).

The system is a Debian testing with a 2.4.20 kernel with the preempt
patches.

Here is the information I saved from before trying to shutdown and after
the failed swapoff (notice swapoff did manage to do its work in one of
the swapfiles):

/proc/meminfo before shutdown:
total: used: free: shared: buffers: cached:
Mem: 130813952 126767104 4046848 0 1245184 34848768
Swap: 268419072 268419072 0
MemTotal: 127748 kB
MemFree: 3952 kB
MemShared: 0 kB
Buffers: 1216 kB
Cached: 34024 kB
SwapCached: 8 kB
Active: 24016 kB
Inactive: 75620 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 127748 kB
LowFree: 3952 kB
SwapTotal: 262128 kB
SwapFree: 0 kB

/proc/slabinfo before shutdown:
slabinfo - version: 1.1
kmem_cache 59 68 112 2 2 1
ip_conntrack 19 60 320 5 5 1
uhci_urb_priv 1 62 60 1 1 1
ip_mrt_cache 0 0 128 0 0 1
tcp_tw_bucket 2 30 128 1 1 1
tcp_bind_bucket 17 112 32 1 1 1
tcp_open_request 0 0 64 0 0 1
inet_peer_cache 3 59 64 1 1 1
ip_fib_hash 13 112 32 1 1 1
ip_dst_cache 43 120 192 6 6 1
arp_cache 3 30 128 1 1 1
blkdev_requests 384 390 128 13 13 1
dnotify_cache 0 0 20 0 0 1
file_lock_cache 9 40 96 1 1 1
fasync_cache 2 202 16 1 1 1
uid_cache 6 112 32 1 1 1
skbuff_head_cache 128 280 192 14 14 1
sock 99 102 1216 34 34 1
sigqueue 0 29 132 0 1 1
kiobuf 0 0 64 0 0 1
cdev_cache 28 118 64 2 2 1
bdev_cache 1 59 64 1 1 1
mnt_cache 12 59 64 1 1 1
inode_cache 1015 2590 512 370 370 1
dentry_cache 968 4620 128 154 154 1
dquot 0 0 128 0 0 1
filp 1871 1890 128 63 63 1
names_cache 0 2 4096 0 2 1
buffer_head 7892 8160 128 272 272 1
mm_struct 82 100 192 5 5 1
vm_area_struct 2515 3030 128 101 101 1
fs_cache 81 118 64 2 2 1
files_cache 81 90 448 10 10 1
signal_act 85 93 1344 31 31 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 0 0 65536 0 0 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 1 1 32768 1 1 8
size-16384(DMA) 0 0 16384 0 0 4
size-16384 1 1 16384 1 1 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 10 10 8192 10 10 2
size-4096(DMA) 0 0 4096 0 0 1
size-4096 47 47 4096 47 47 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 8 10 2048 5 5 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 70 72 1024 18 18 1
size-512(DMA) 0 0 512 0 0 1
size-512 42 48 512 6 6 1
size-256(DMA) 0 0 256 0 0 1
size-256 28 45 256 3 3 1
size-128(DMA) 2 30 128 1 1 1
size-128 544 570 128 19 19 1
size-64(DMA) 0 0 64 0 0 1
size-64 655 1121 64 19 19 1
size-32(DMA) 2 59 64 1 1 1
size-32 800 2006 64 34 34 1

/proc/meminfo after trying to shutdown:
total: used: free: shared: buffers: cached:
Mem: 130813952 127279104 3534848 0 2551808 113352704
Swap: 134209536 134209536 0
MemTotal: 127748 kB
MemFree: 3452 kB
MemShared: 0 kB
Buffers: 2492 kB
Cached: 67284 kB
SwapCached: 43412 kB
Active: 59980 kB
Inactive: 53688 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 127748 kB
LowFree: 3452 kB
SwapTotal: 131064 kB
SwapFree: 0 kB

/proc/slabinfo after trying to shutdown:
slabinfo - version: 1.1
kmem_cache 58 68 112 2 2 1
ip_conntrack 13 60 320 5 5 1
ip_mrt_cache 0 0 128 0 0 1
tcp_tw_bucket 0 0 128 0 0 1
tcp_bind_bucket 0 0 32 0 0 1
tcp_open_request 0 0 64 0 0 1
inet_peer_cache 2 59 64 1 1 1
ip_fib_hash 4 112 32 1 1 1
ip_dst_cache 0 0 192 0 0 1
arp_cache 0 0 128 0 0 1
blkdev_requests 384 390 128 13 13 1
dnotify_cache 0 0 20 0 0 1
file_lock_cache 0 0 96 0 0 1
fasync_cache 0 0 16 0 0 1
uid_cache 0 0 32 0 0 1
skbuff_head_cache 128 280 192 14 14 1
sock 4 6 1216 2 2 1
sigqueue 14 29 132 1 1 1
kiobuf 0 0 64 0 0 1
cdev_cache 838 885 64 15 15 1
bdev_cache 1 59 64 1 1 1
mnt_cache 10 59 64 1 1 1
inode_cache 6980 6986 512 998 998 1
dentry_cache 7058 7080 128 236 236 1
dquot 0 0 128 0 0 1
filp 1871 1890 128 63 63 1
names_cache 0 1 4096 0 1 1
buffer_head 7162 8730 128 291 291 1
mm_struct 3 20 192 1 1 1
vm_area_struct 37 60 128 2 2 1
fs_cache 2 59 64 1 1 1
files_cache 2 9 448 1 1 1
signal_act 4 6 1344 2 2 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 0 0 65536 0 0 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 1 1 32768 1 1 8
size-16384(DMA) 0 0 16384 0 0 4
size-16384 0 0 16384 0 0 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 9 9 8192 9 9 2
size-4096(DMA) 0 0 4096 0 0 1
size-4096 4 4 4096 4 4 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 7 8 2048 4 4 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 24 36 1024 9 9 1
size-512(DMA) 0 0 512 0 0 1
size-512 37 48 512 6 6 1
size-256(DMA) 0 0 256 0 0 1
size-256 19 30 256 2 2 1
size-128(DMA) 0 0 128 0 0 1
size-128 530 570 128 19 19 1
size-64(DMA) 0 0 64 0 0 1
size-64 523 1062 64 18 18 1
size-32(DMA) 0 0 64 0 0 1
size-32 1323 2006 64 34 34 1

ps ax after trying to shutdown:
PID TTY STAT TIME COMMAND
1 ? S 0:10 init [6]
2 ? SW 0:06 [keventd]
3 ? SW 0:00 [kapmd]
4 ? SWN 0:00 [ksoftirqd_CPU0]
5 ? SW 5:12 [kswapd]
6 ? SW 0:01 [bdflush]
7 ? SW 0:05 [kupdated]
21859 ? S 0:00 bash
21873 ? R 0:00 ps axwww

memstat -w after trying to shutdown:
36k: PID 1 (/sbin/init)
264k: PID 21859 (/bin/bash)
28k: PID 21869 (/usr/bin/memstat)
72k: /lib/ld-2.3.1.so 1 21859 21869
1076k: /lib/libc-2.3.1.so 1 21859 21869
8k: /lib/libdl-2.3.1.so 21859
68k: /lib/libnsl-2.3.1.so 21859
40k: /lib/libnss_compat-2.3.1.so 21859
248k: /lib/libncurses.so.5.3 21859
8k: /usr/bin/memstat 21869
28k: /sbin/init 1
568k: /bin/bash 21859
--------
2444k

/proc/cpuinfo:
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 2
model name : AMD Athlon(tm) Processor
stepping : 2
cpu MHz : 748.578
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr syscall mmxext 3dnowext 3dnow
bogomips : 1494.22

/proc/meminfo some time after reboot (it's normally like this):
total: used: free: shared: buffers: cached:
Mem: 130813952 125263872 5550080 0 4214784 71327744
Swap: 268419072 80072704 188346368
MemTotal: 127748 kB
MemFree: 5420 kB
MemShared: 0 kB
Buffers: 4116 kB
Cached: 48644 kB
SwapCached: 21012 kB
Active: 45116 kB
Inactive: 55212 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 127748 kB
LowFree: 5420 kB
SwapTotal: 262128 kB
SwapFree: 183932 kB

/proc/slabinfo some time after reboot:
slabinfo - version: 1.1
kmem_cache 59 68 112 2 2 1
ip_conntrack 14 60 320 5 5 1
uhci_urb_priv 1 62 60 1 1 1
ip_mrt_cache 0 0 128 0 0 1
tcp_tw_bucket 0 30 128 0 1 1
tcp_bind_bucket 18 112 32 1 1 1
tcp_open_request 0 0 64 0 0 1
inet_peer_cache 1 59 64 1 1 1
ip_fib_hash 13 112 32 1 1 1
ip_dst_cache 39 180 192 9 9 1
arp_cache 3 30 128 1 1 1
blkdev_requests 384 390 128 13 13 1
dnotify_cache 0 0 20 0 0 1
file_lock_cache 9 40 96 1 1 1
fasync_cache 2 202 16 1 1 1
uid_cache 7 112 32 1 1 1
skbuff_head_cache 128 240 192 12 12 1
sock 110 114 1216 38 38 1
sigqueue 0 29 132 0 1 1
kiobuf 0 0 64 0 0 1
cdev_cache 31 118 64 2 2 1
bdev_cache 1 59 64 1 1 1
mnt_cache 12 59 64 1 1 1
inode_cache 1221 1484 512 212 212 1
dentry_cache 1335 2190 128 73 73 1
dquot 0 0 128 0 0 1
filp 1437 1440 128 48 48 1
names_cache 0 2 4096 0 2 1
buffer_head 10222 12300 128 410 410 1
mm_struct 80 100 192 4 5 1
vm_area_struct 3153 3270 128 108 109 1
fs_cache 79 118 64 2 2 1
files_cache 79 90 448 9 10 1
signal_act 83 90 1344 28 30 1
size-131072(DMA) 0 0 131072 0 0 32
size-131072 0 0 131072 0 0 32
size-65536(DMA) 0 0 65536 0 0 16
size-65536 0 0 65536 0 0 16
size-32768(DMA) 0 0 32768 0 0 8
size-32768 1 1 32768 1 1 8
size-16384(DMA) 0 0 16384 0 0 4
size-16384 1 1 16384 1 1 4
size-8192(DMA) 0 0 8192 0 0 2
size-8192 10 10 8192 10 10 2
size-4096(DMA) 0 0 4096 0 0 1
size-4096 51 63 4096 51 63 1
size-2048(DMA) 0 0 2048 0 0 1
size-2048 10 18 2048 5 9 1
size-1024(DMA) 0 0 1024 0 0 1
size-1024 59 132 1024 15 33 1
size-512(DMA) 0 0 512 0 0 1
size-512 36 104 512 5 13 1
size-256(DMA) 0 0 256 0 0 1
size-256 27 90 256 2 6 1
size-128(DMA) 2 30 128 1 1 1
size-128 512 570 128 19 19 1
size-64(DMA) 0 0 64 0 0 1
size-64 353 413 64 7 7 1
size-32(DMA) 2 59 64 1 1 1
size-32 778 1062 64 18 18 1

-- 
Cesar Eduardo Barros
cesarb@nitnet.com.br
cesarb@dcc.ufrj.br
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Next message: Chuck Ebbert: "Re: Benefits from computing physical IDE disk geometry?"
Previous message: Andrew Morton: "Re: 2.5.67-mm2: multiple definition of `ipip_err'"