Hi
I'm getting the following BUG report with 2.6.13-git5:-
------------[ cut here ]------------
kernel BUG at net/ipv4/tcp.c:775!
invalid operand: 0000 [#5]
PREEMPT
Modules linked in: raw ipv6 snd_seq_oss snd_seq_midi_event snd_seq
snd_seq_devic
e snd_pcm_oss snd_mixer_oss snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_pcm
snd
_timer snd_page_alloc snd soundcore parport_pc lp parport floppy natsemi
nls_iso
8859_15 ntfs mga_vid fusion intel_agp agpgart hw_random uhci_hcd usbcore
sd_mod
aic7xxx scsi_transport_spi
CPU: 0
EIP: 0060:[<c0266a08>] Not tainted VLI
EFLAGS: 00010206 (2.6.13-git5)
EIP is at tcp_sendmsg+0x8c4/0xab3
eax: 00001000 ebx: 00001000 ecx: 00000000 edx: 00000001
esi: d2e09700 edi: 0000015c ebp: d4f67380 esp: d3f97d68
ds: 007b es: 007b ss: 0068
Process httpd (pid: 5952, threadinfo=d3f97000 task=d6b84030)
Stack: ea055778 0000008f d6b84030 d6b8415c d3f97000 ffffffff 00001000
00000000
00000001 00000000 d293e1b5 000000b5 084329a4 0000015c 00001e80
00004000
00004000 00000040 00000003 d3f97f4c 00000000 000080d2 00000000
e2c638a0
Call Trace:
[<c0281e34>] inet_sendmsg+0x47/0x5f
[<c0241e30>] sock_sendmsg+0xc9/0xeb
[<c013fbf8>] do_no_page+0x6b/0x36d
[<c013f0a5>] do_wp_page+0x214/0x361
[<c013574c>] buffered_rmqueue+0x107/0x1e9
[<c0127dad>] autoremove_wake_function+0x0/0x43
[<c0135c04>] __alloc_pages+0x313/0x3c6
[<c02422cb>] sock_readv_writev+0x69/0x8e
[<c0242368>] sock_writev+0x37/0x3e
[<c0242331>] sock_writev+0x0/0x3e
[<c014dfd1>] do_readv_writev+0x29a/0x2c2
[<c01104eb>] do_page_fault+0x1a2/0x54a
[<c014e08b>] vfs_writev+0x48/0x4d
[<c014e16e>] sys_writev+0x41/0x9d
[<c01029a3>] sysenter_past_esp+0x54/0x75
Code: 01 f8 3d ff 0f 00 00 0f 87 ee fc ff ff 8b 4c 24 1c ff 41 08 89 8e fc
00 00
00 e9 dc fc ff ff 8b 44 24 18 85 c0 0f 84 d0 fb ff ff <0f> 0b 07 03 e0 72
2b c0
e9 c3 fb ff ff 31 c9 8b 54 24 2c 89 e8
Any more details required?
I'll build a debug version and see if i get a better trace.
Colin Harrison
From: "Colin Harrison" <[email protected]>
Date: Mon, 5 Sep 2005 16:43:44 +0100
> I'm getting the following BUG report with 2.6.13-git5:-
Should be fixed by this patch. And please use [email protected]
for networking kernel stuff, thanks.
diff-tree fb5f5e6e0cebd574be737334671d1aa8f170d5f3 (from 1198ad002ad36291817c7bf0308ab9c50ee2571d)
Author: Herbert Xu <[email protected]>
Date: Mon Sep 5 18:55:48 2005 -0700
[TCP]: Fix TCP_OFF() bug check introduced by previous change.
The TCP_OFF assignment at the bottom of that if block can indeed set
TCP_OFF without setting TCP_PAGE. Since there is not much to be
gained from avoiding this situation, we might as well just zap the
offset. The following patch should fix it.
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -769,10 +769,10 @@ new_segment:
if (off == PAGE_SIZE) {
put_page(page);
TCP_PAGE(sk) = page = NULL;
- TCP_OFF(sk) = off = 0;
+ off = 0;
}
} else
- BUG_ON(off);
+ off = 0;
if (copy > PAGE_SIZE - off)
copy = PAGE_SIZE - off;