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Message-ID: <115440.16148.qm@web63902.mail.re1.yahoo.com>
Date: Sat, 22 Jan 2011 11:42:54 -0800 (PST)
From: PK <runningdoglackey@...oo.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: Problems with /proc/net/tcp6 - possible bug - ipv6
Eric Dumazet wrote:
>
> I had some incidents, after hours of testing...
>
> After following patch, I could not reproduce it.
Looks like that patch solved the /proc/net/tcp6 problem. The causal commit was
the one you identified... confirmed with bisect.
These warnings show up when I run the script (or I presume any tcp6 connection
flooder) with /proc/sys/net/tcp/ipv4/tcp_tw_recycle enabled. There's textual
corruption of the traces a lot of the time. Here's a sample trace that doesn't
appear to be corrupt. All the warnings I've seen are from route.c:209, and I
don't see how that would cause memory corruption.
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629431] ------------[ cut here
]------------
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629435] WARNING: at
net/ipv6/route.c:209 rt6_bind_peer+0x74/0x80()
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629436] Hardware name: VirtualBox
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629437] Modules linked in: nls_utf8
isofs fuse snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm snd_seq_midi snd_rawmidi
snd_seq_midi_eve
nt snd_seq snd_timer snd_seq_device snd psmouse e1000 i2c_piix4 soundcore
snd_page_alloc
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629446] Pid: 1741, comm: ruby Tainted:
G W 2.6.38-rc2+ #15
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629447] Call Trace:
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629448] <IRQ> [<ffffffff81048b7f>] ?
warn_slowpath_common+0x7f/0xc0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629452] [<ffffffff81048bda>] ?
warn_slowpath_null+0x1a/0x20
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629454] [<ffffffff814534a4>] ?
rt6_bind_peer+0x74/0x80
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629456] [<ffffffff8146aa2d>] ?
tcp_v6_get_peer+0xbd/0xd0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629458] [<ffffffff8140c6f7>] ?
tcp_time_wait+0x287/0x300
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629460] [<ffffffff813fd089>] ?
tcp_fin+0x119/0x1f0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629462] [<ffffffff813fd8de>] ?
tcp_data_queue+0x77e/0xc60
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629464] [<ffffffff814017f9>] ?
tcp_rcv_state_process+0x6f9/0xa40
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629466] [<ffffffff81400e25>] ?
tcp_rcv_established+0x345/0x620
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629468] [<ffffffff8146b0ee>] ?
tcp_v6_do_rcv+0x18e/0x540
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629470] [<ffffffff8146c468>] ?
tcp_v6_rcv+0x728/0x7e0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629473] [<ffffffff81447bdd>] ?
ip6_input_finish+0x17d/0x3a0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629475] [<ffffffff81447e58>] ?
ip6_input+0x58/0x60
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629477] [<ffffffff81447651>] ?
ip6_rcv_finish+0x21/0x50
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629488] [<ffffffff81447998>] ?
ipv6_rcv+0x318/0x3e0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629491] [<ffffffff813b3e7a>] ?
__netif_receive_skb+0x40a/0x690
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629493] [<ffffffff813b420a>] ?
process_backlog+0x10a/0x210
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629496] [<ffffffff814996b5>] ?
_raw_spin_lock_irq+0x15/0x20
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629498] [<ffffffff813b9612>] ?
net_rx_action+0x112/0x2f0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629500] [<ffffffff8104f85b>] ?
__do_softirq+0xab/0x200
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629502] [<ffffffff81003e7c>] ?
call_softirq+0x1c/0x30
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629503] <EOI> [<ffffffff81005505>] ?
do_softirq+0x65/0xa0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629506] [<ffffffff8104f354>] ?
local_bh_enable+0x94/0xa0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629508] [<ffffffff813b8372>] ?
dev_queue_xmit+0x1c2/0x620
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629510] [<ffffffff814452c6>] ?
ip6_finish_output2+0xb6/0x370
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629512] [<ffffffff8113d1c0>] ?
__pollwait+0x0/0xf0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629514] [<ffffffff81446770>] ?
ip6_finish_output+0x90/0xc0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629516] [<ffffffff81446818>] ?
ip6_output+0x78/0xf0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629518] [<ffffffff81443804>] ?
dst_output+0x14/0x20
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629520] [<ffffffff81446c88>] ?
ip6_xmit+0x3f8/0x4c0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629523] [<ffffffff814729f8>] ?
inet6_csk_xmit+0x268/0x2e0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629525] [<ffffffff8149968f>] ?
_raw_spin_lock_irqsave+0x2f/0x40
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629527] [<ffffffff814029a7>] ?
tcp_transmit_skb+0x407/0x8f0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629529] [<ffffffff81405197>] ?
tcp_write_xmit+0x1e7/0x9d0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629531] [<ffffffff81405c27>] ?
tcp_send_fin+0xa7/0x1d0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629533] [<ffffffff81405b06>] ?
__tcp_push_pending_frames+0x26/0xa0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629535] [<ffffffff81405bed>] ?
tcp_send_fin+0x6d/0x1d0
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629536] [<ffffffff813f64e9>] ?
tcp_close+0x109/0x440
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629539] [<ffffffff8141a9de>] ?
inet_release+0x5e/0x80
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629541] [<ffffffff8144226f>] ?
inet6_release+0x3f/0x50
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629548] [<ffffffff813a1559>] ?
sock_release+0x29/0x90
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629549] [<ffffffff813a15d7>] ?
sock_close+0x17/0x30
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629551] [<ffffffff8112cc0a>] ?
fput+0xea/0x260
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629553] [<ffffffff8112928d>] ?
filp_close+0x5d/0x90
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629555] [<ffffffff81129377>] ?
sys_close+0xb7/0x120
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629558] [<ffffffff81002f82>] ?
system_call_fastpath+0x16/0x1b
Jan 22 11:09:08 vbox-alpha kernel: [ 907.629559] ---[ end trace
e63dd54cc0b51607 ]---
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