Re: PROBLEM: 2.6test11 kernel panic on "head -1 /proc/net/tcp"
Date: Fri Dec 05 2003 - 07:31:01 EST
reproduced without ppp activated, but with lan ipv4 connection.
the system freexed, but unfortunatelly I was under X11, and no oops was saved in
On Fri, 5 Dec 2003 lkml-031128@xxxxxxxxxxxxxxxxxx wrote:
> Date: Fri, 05 Dec 2003 13:23:15 +0200
> From: lkml-031128@xxxxxxxxxxxxxxxxxx
> To: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: PROBLEM: 2.6test11 kernel panic on "head -1 /proc/net/tcp"
> OGAWA Hirofumi wrote:
> > lkml-031128@xxxxxxxxxxxxxxxxxx writes:
> >>After I added Ogawa's line, "head -1 /proc/net/tcp" stopped
> >>freezing my machine but PPP failed to work.
> >>Also after adding Ogawa's line, PPP works fine (as it is now, as
> >>I write this message) as long as I don't try "head -1 /proc/net/tcp"
> >>after boot. If I'll try "head -1 /proc/net/tcp" now PPP will stop
> > Can you reproduce the fail of PPP? I couldn't reproduce it.
> > What reason is the fail of PPP? (the "debug" option of pppd may be helpful)
> Sorry. I just tried:
> 1. From a multi-user mode, after an uptime of 5 days (test11 with your
> 2. killed the ppp daemon (/etc/init.d/ppp stop). Made sure the ppp0
> interface is down.
> 3. did "head -1 /proc/net/tcp" and "cat /proc/net/tcp". Passed fine.
> 4. re-startted ppp daemon.
> 5. System is fine. No kernel errors. PPP works flowlessly.
> So I think my linking of PPP to the fix was wrong. Maybe the PPP failure
> was unrelated to this.
> > Of course, the following message is easy reproducible. But it's
> > debugging message, not the real problem. And probably it's unrelated
> > to the fail of PPP.
> >>>>>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
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