From: lkml-031128@amos.mailshell.com
To: linux-kernel@vger.kernel.org
Subject: Re: PROBLEM: 2.6test11 kernel panic on "head -1 /proc/net/tcp"
Date: Sat, 29 Nov 2003 19:00:31 +0200 [thread overview]
Message-ID: <20031129170034.10522.qmail@mailshell.com> (raw)
In-Reply-To: <87d6bc2yvq.fsf@devron.myhome.or.jp>
OGAWA Hirofumi wrote:
> lkml-031128@amos.mailshell.com writes:
>
>
>>"bad: scheduling while atomic!
>>Call Trace:
>> schedule+0x55d/0x570
>
>
> Does this patch fix this problem?
>
> diff -puN net/ipv4/tcp_ipv4.c~tcp_seq-oops-fix net/ipv4/tcp_ipv4.c
> --- linux-2.6.0-test11/net/ipv4/tcp_ipv4.c~tcp_seq-oops-fix 2003-11-29 00:52:15.000000000 +0900
> +++ linux-2.6.0-test11-hirofumi/net/ipv4/tcp_ipv4.c 2003-11-29 00:52:28.000000000 +0900
> @@ -2356,6 +2356,7 @@ static void *tcp_get_idx(struct seq_file
> static void *tcp_seq_start(struct seq_file *seq, loff_t *pos)
> {
> struct tcp_iter_state* st = seq->private;
> + st->state = TCP_SEQ_STATE_LISTENING;
> st->num = 0;
> return *pos ? tcp_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
> }
>
> _
Partially. It seems to trigger ppp failure later.
What I do to test this:
1. Compiled a pre-emptive kernel with nothing different in the config
and the code except that I added your patch.
2. Boot to single user mode as before.
3. "cat /proc/net/tcp" runs fine.
4. "head -1 /proc/net/tcp" runs fine (it used to freeze with an oops, as
described in my original message).
5. I logout from single user mode and let the system boot to multi-user.
This gives me tons of messages like the following:
Badness in local_bh_enable at kernel/softirq.c:121
Call Trace:
[<c011df25>] local_bh_enable+0x85/0x90
[<c02315e2>] ppp_async_push+0xa2/0x180
[<c0230efd>] ppp_asynctty_wakeup+0x2d/0x60
[<c0202638>] pty_unthrottle+0x58/0x60
[<c01ff0fd>] check_unthrottle+0x3d/0x40
[<c01ff1a3>] n_tty_flush_buffer+0x13/0x60
[<c0202a47>] pty_flush_buffer+0x67/0x70
[<c01fba41>] do_tty_hangup+0x3f1/0x460
[<c01fcfbc>] release_dev+0x62c/0x660
[<c013dfab>] zap_pmd_range+0x4b/0x70
[<c013e013>] unmap_page_range+0x43/0x70
[<c01622a2>] dput+0x22/0x210
[<c01fd38a>] tty_release+0x2a/0x60
[<c014ccf8>] __fput+0x108/0x120
[<c014b359>] filp_close+0x59/0x90
[<c011b874>] put_files_struct+0x54/0xc0
[<c011c47d>] do_exit+0x15d/0x3e0
[<c011c79a>] do_group_exit+0x3a/0xb0
[<c01091b7>] syscall_call+0x7/0xb
PPP fails. Re-run "pon adsl-provider" or "/etc/init.d/ppp start" fails.
What I get on such attempts are messages in /var/log/messages
like:
Nov 29 18:48:57 picton kernel: Badness in local_bh_enable at
kernel/softirq.c:121
Nov 29 18:48:57 picton kernel: Call Trace:
Nov 29 18:48:57 picton kernel: [local_bh_enable+133/144]
local_bh_enable+0x85/0x90
Nov 29 18:48:57 picton kernel: [ppp_async_push+162/384]
ppp_async_push+0xa2/0x180
Nov 29 18:48:57 picton kernel: [ppp_asynctty_wakeup+45/96]
ppp_asynctty_wakeup+0x2d/0x60
Nov 29 18:48:57 picton kernel: [pty_unthrottle+88/96]
pty_unthrottle+0x58/0x60
Nov 29 18:48:57 picton kernel: [check_unthrottle+61/64]
check_unthrottle+0x3d/0x40
Nov 29 18:48:57 picton kernel: [n_tty_flush_buffer+19/96]
n_tty_flush_buffer+0x13/0x60
Nov 29 18:48:57 picton kernel: [pty_flush_buffer+103/112]
pty_flush_buffer+0x67/0x70
Nov 29 18:48:57 picton kernel: [do_tty_hangup+1009/1120]
do_tty_hangup+0x3f1/0x460
Nov 29 18:48:57 picton kernel: [release_dev+1580/1632]
release_dev+0x62c/0x660
Nov 29 18:48:57 picton kernel: [zap_pmd_range+75/112]
zap_pmd_range+0x4b/0x70
Nov 29 18:48:57 picton kernel: [unmap_page_range+67/112]
unmap_page_range+0x43/0x70
Nov 29 18:48:57 picton kernel: [dput+34/528] dput+0x22/0x210
Nov 29 18:48:57 picton kernel: [tty_release+42/96] tty_release+0x2a/0x60
Nov 29 18:48:57 picton kernel: [__fput+264/288] __fput+0x108/0x120
Nov 29 18:48:57 picton kernel: [filp_close+89/144] filp_close+0x59/0x90
Nov 29 18:48:57 picton kernel: [put_files_struct+84/192]
put_files_struct+0x54/0xc0
Nov 29 18:48:57 picton kernel: [do_exit+349/992] do_exit+0x15d/0x3e0
Nov 29 18:48:57 picton kernel: [do_group_exit+58/176]
do_group_exit+0x3a/0xb0
Nov 29 18:48:57 picton kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Nov 29 18:48:57 picton kernel:
Nov 29 18:48:57 picton pppd[32717]: Modem hangup
Nov 29 18:48:57 picton pppd[32717]: Connection terminated.
Nov 29 18:48:57 picton pppd[32717]: Exit.
Ksymoops doesn't seem to add much useful data, here is what I get
from it:
Trace; c011df25 <local_bh_enable+85/90>
Trace; c02315e2 <ppp_async_push+a2/180>
Trace; c0230efd <ppp_asynctty_wakeup+2d/60>
Trace; c0202638 <pty_unthrottle+58/60>
Trace; c01ff0fd <check_unthrottle+3d/40>
Trace; c01ff1a3 <n_tty_flush_buffer+13/60>
Trace; c0202a47 <pty_flush_buffer+67/70>
Trace; c01fba41 <do_tty_hangup+3f1/460>
Trace; c01fcfbc <release_dev+62c/660>
Trace; c013dfab <zap_pmd_range+4b/70>
Trace; c013e013 <unmap_page_range+43/70>
Trace; c01622a2 <dput+22/210>
Trace; c01fd38a <tty_release+2a/60>
Trace; c014ccf8 <__fput+108/120>
Trace; c014b359 <filp_close+59/90>
Trace; c011b874 <put_files_struct+54/c0>
Trace; c011c47d <do_exit+15d/3e0>
Trace; c011c79a <do_group_exit+3a/b0>
Trace; c01091b7 <syscall_call+7/b>
If I avoid doing the "head -1 /proc/net/tcp" in single user then PPP
works.
Thanks,
--Amos
next prev parent reply other threads:[~2003-11-29 17:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-28 17:01 PROBLEM: 2.6test11 kernel panic on "head -1 /proc/net/tcp" lkml-031128
2003-11-28 17:20 ` OGAWA Hirofumi
2003-11-29 17:00 ` lkml-031128 [this message]
2003-12-01 1:29 ` Thomas Cataldo
2003-12-01 21:11 ` Jonathan Fors
2003-12-01 21:36 ` lkml-031128
2003-12-03 15:18 ` OGAWA Hirofumi
2003-12-05 11:23 ` lkml-031128
2003-12-05 12:29 ` venom
2003-12-05 14:10 ` OGAWA Hirofumi
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