Home » Mailing list archives » linux-net » 2008 » March » 23

IPv6 slab leak (was: Re: dst cache overflow)

Previous thread: Re: dst cache overflow by Tobias Diedrich on Friday, December 14, 2007 - 1:29 pm. (7 messages)

Next thread: WINNERS IN LRP DRAW!!! by inforheinlandpfalz02 on Sunday, December 16, 2007 - 7:17 am. (5 messages)
[view original message]
From: aaa bbb <ilana90@...>
To: <unlisted-recipients@...>, <@...>
Subject: Hello
Date: Friday, November 27, 2009 - 7:36 pm

Hello

How are you today? I hope you are fine.If so thank be to God almighty.My name is Miss Ojita,26 years, single girl looking for honest and nice person. whom i can partner with. i have the sum of $7,000,000.00(Seven Million US Dollars) which i intend to use for business purpose.I would like to know you more,most especially what you like and what you dislike, I don't care about your colour or ethnicity, I'm sending you this beautiful mail, with a wish for much happiness.I am looking forward to hear from you,

Love from,

Ojita

--
[view original message]
From: Tobias Diedrich <ranma+kernel@...>
To: Herbert Xu <herbert@...>
Cc: <linux-net@...>, <linux-kernel@...>, <dada1@...>
Subject: Re: dst cache overflow
Date: Sunday, December 16, 2007 - 4:38 am

ranma@oni:~$ cat /proc/net/sockstat

sockets: used 143

TCP: inuse 16 orphan 0 tw 4 alloc 21 mem 1

UDP: inuse 8

UDPLITE: inuse 0

RAW: inuse 0

FRAG: inuse 0 memory 0


HTH,


--

Tobias						PGP: http://9ac7e0bc.uguu.de

このメールは十割再利用されたビットで作られています。

-
[view original message]
From: Tobias Diedrich <ranma@...>
To: Herbert Xu <herbert@...>, <linux-net@...>, <linux-kernel@...>, <dada1@...>
Subject: Re: dst cache overflow
Date: Sunday, March 16, 2008 - 9:25 pm

Hi all,


just a reminder, the server is now running 2.6.24 and the leak is

still there.  I noticed there is a slab leak debug option and turned

it on, results should be visible in a few days I guess.


Offenders: Slabs TCPv6, size_2048 and size_512 grow over time.


I also noticed that the machine stops responding to pings after some

time, which seems to coincide with a slight increase in leak speed.


Interstingly IPv4 pings give out first, IPv6 pings continue to work a bit

longer, but eventually fail too. (Because sixxs starts sending 'your

tunnel is down!' mails I actually wrote a userspace pingd as a

workaround...)


/proc/net/snmp seems to indicate the kernel thinks it is still

sending ping replies.


HTH,


--

Tobias						PGP: http://9ac7e0bc.uguu.de

--
[view original message]
From: Tobias Diedrich <ranma+kernel@...>
To: Herbert Xu <herbert@...>, <linux-net@...>, <linux-kernel@...>, <dada1@...>
Subject: Re: dst cache overflow
Date: Tuesday, March 18, 2008 - 2:59 pm

Current (20080318 19:42) biggest net-related numbers:


skbuff_head_cache: 1614 __alloc_skb+0x29/0x108

ip_dst_cache: 1579 dst_alloc+0x25/0x5f

skbuff_fclone_cache: 965 __alloc_skb+0x29/0x108

size-512: 895 sock_wmalloc+0x2b/0x4d

TCPv6: 856 sk_clone+0x14/0x16a

size-2048: 733 tcp_sendmsg+0x174/0x9fc

size-512: 279 sock_alloc_send_skb+0x7c/0x193

size-512: 238 tcp_send_ack+0x2a/0xec

size-512: 223 tcp_send_fin+0x60/0x12e

sock_inode_cache: 172 sock_alloc_inode+0x10/0x4e

size-1024: 147 sock_alloc_send_skb+0x7c/0x193


ranma@oni:~$ netstat -6 -an | wc -l

29


--

Tobias						PGP: http://9ac7e0bc.uguu.de

このメールは十割再利用されたビットで作られています。

--
[view original message]
From: Tobias Diedrich <ranma+kernel@...>
To: Herbert Xu <herbert@...>
Cc: <linux-net@...>, <linux-kernel@...>, Eric Dumazet <dada1@...>
Subject: IPv6 slab leak (was: Re: dst cache overflow)
Date: Sunday, March 23, 2008 - 5:21 am

20080323 10:03

ip_dst_cache: 5556 dst_alloc+0x25/0x5f

skbuff_fclone_cache: 4668 __alloc_skb+0x29/0x108

TCPv6: 4113 sk_clone+0x14/0x16a

skbuff_head_cache: 3919 __alloc_skb+0x29/0x108

size-2048: 3662 tcp_sendmsg+0x174/0x9fc

size-512: 1126 sock_alloc_send_skb+0x7c/0x193

size-512: 990 tcp_send_ack+0x2a/0xec

size-512: 973 tcp_send_fin+0x60/0x12e

size-1024: 349 sock_alloc_send_skb+0x7c/0x193


http://tdiedrich.de/~ranma/slab_allocators.20080318

http://tdiedrich.de/~ranma/slab_allocators.20080319

http://tdiedrich.de/~ranma/slab_allocators.20080321

http://tdiedrich.de/~ranma/slab_allocators.20080323


http://tdiedrich.de/~ranma/slab-month-oni-20080323.png

http://tdiedrich.de/~ranma/route-month-oni-20080323.png


oni:~# ip route ls

217.172.187.0/24 dev eth0  proto kernel  scope link  src

217.172.187.75

default via 217.172.187.1 dev eth0

oni:~# ip -6 route ls

2001:6f8:900:aee::/64 via :: dev sixxs  metric 256  expires -152518sec mtu 1480 advmss 1420 hoplimit 4294967295

2001:6f8:1002::/64 via :: dev sixxs  metric 256  expires -152518sec mtu 1480 advmss 1420 hoplimit 4294967295

fe80::/64 dev eth0  metric 256  expires -552013sec mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 via :: dev sixxs  metric 256  expires -152517sec mtu 1480 advmss 1420 hoplimit 4294967295

ff00::/8 dev eth0  metric 256  expires -552013sec mtu 1500 advmss 1440 hoplimit 4294967295

ff00::/8 dev sixxs  metric 256  expires -152517sec mtu 1480 advmss 1420 hoplimit 4294967295

default via 2001:6f8:900:aee::1 dev sixxs  metric 1  expires -152517sec mtu 1480 advmss 1420 hoplimit 4294967295

oni:~# uptime

 10:09:07 up 6 days,  9:20,  1 user,  load average: 0.14, 0.10, 0.08

oni:~# ip route ls cache | fgrep cache | wc -l

81

oni:~# cat /proc/net/stat/rt_cache

entries  in_hit in_slow_tot in_slow_mc in_no_route in_brd

in_martian_dst in_martian_src  out_hit out_slow_tot out_slow_mc

gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search

out_hlist_search

000015b5  0049feed 0035b5a2 00000000 00000000 00000006 00000000...
[ message continues ]
[view original message]
From: Tobias Diedrich <ranma+kernel@...>
To: Herbert Xu <herbert@...>, <linux-net@...>, <linux-kernel@...>, Eric Dumazet <dada1@...>
Subject: Re: IPv6 slab leak (was: Re: dst cache overflow)
Date: Friday, May 16, 2008 - 3:46 pm

I'm upgrading to 2.6.25.4 now and I hope that "sit: Add missing

kfree_skb() on pskb_may_pull() failure." finally fixes the bug. :)

There also was some IPv6 related leak-fix in 2.6.24.something IIRC,

but that one did not help unfortunately.


Cheers,


--=20

Tobias						PGP: http://9ac7e0bc.uguu.de

=E3=81=93=E3=81=AE=E3=83=A1=E3=83=BC=E3=83=AB=E3=81=AF=E5=8D=81=E5=89=B2=E5=

=86=8D=E5=88=A9=E7=94=A8=E3=81=95=E3=82=8C=E3=81=9F=E3=83=93=E3=83=83=E3=83=

=88=E3=81=A7=E4=BD=9C=E3=82=89=E3=82=8C=E3=81=A6=E3=81=84=E3=81=BE=E3=81=99=

=E3=80=82
[view original message]
From: Tobias Diedrich <ranma+kernel@...>
To: Herbert Xu <herbert@...>, <linux-net@...>, <linux-kernel@...>, Eric Dumazet <dada1@...>
Subject: Re: IPv6 slab leak (was: Re: dst cache overflow)
Date: Sunday, May 18, 2008 - 12:49 pm

Ok, it's only been running for ~2 days now, but it very much looks

fixed now:

http://www.tdiedrich.de/~ranma/oni_20080518_route-year.png

http://www.tdiedrich.de/~ranma/oni_20080518_route-week.png

http://www.tdiedrich.de/~ranma/oni_20080518_route-day.png


Cheers,


--

Tobias						PGP: http://9ac7e0bc.uguu.de

このメールは十割再利用されたビットで作られています。

--
Previous thread: Re: dst cache overflow by Tobias Diedrich on Friday, December 14, 2007 - 1:29 pm. (7 messages)

Next thread: WINNERS IN LRP DRAW!!! by inforheinlandpfalz02 on Sunday, December 16, 2007 - 7:17 am. (5 messages)