* Re: [Bugme-new] [Bug 11855] New: kernel BUG when bringing down ppp connection
[not found] <bug-11855-10286@http.bugzilla.kernel.org/>
@ 2008-10-28 3:24 ` Andrew Morton
2008-10-28 9:44 ` Alan Cox
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Morton @ 2008-10-28 3:24 UTC (permalink / raw)
To: netdev; +Cc: bugme-daemon, Alan Cox, bluesloth600
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Sat, 25 Oct 2008 17:34:16 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=11855
>
> Summary: kernel BUG when bringing down ppp connection
> Product: Networking
> Version: 2.5
> KernelVersion: 2.6.27.3
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: Other
> AssignedTo: acme@ghostprotocols.net
> ReportedBy: bluesloth600@gmail.com
>
>
> Latest working kernel version: 2.6.26.6
> Earliest failing kernel version: 2.6.27
A regression.
> Distribution: Debian sid
> Hardware Environment: Dell Inspiron 1721, AMD x86-64 SMP
> Software Environment:
> Gnu C 4.3.2
> Gnu make 3.81
> binutils 2.18.0.20080103
> util-linux 2.13.1.1
> mount 2.13.1.1
> module-init-tools found
> Linux C Library 2.7
> Dynamic linker (ldd) 2.7
> Procps 3.2.7
> Console-tools 0.2.3
> Sh-utils 6.10
> udev 125
>
> Problem Description: I connect to my dialup service with a Zoom model 3048
> modem connected via a Radio Shack 26-183 USB/serial converter cable. When I
> log off (using poff), sometimes it works perfectly, but usually after the modem
> disconnects I get:
>
> kernel BUG at drivers/char/tty_ldisc.c:199!
> invalid opcode: 0000 [1] PREEMPT SMP
> CPU 1
This has an Alany feel to it?
> and then 12 screenfuls of stack traces and stuff, with a bunch of "scheduling
> while atomic" BUGs.. none of it ever managed to get in any logs, so I'll be
> attaching photos of the screen.
>
> At this point, sometimes the magic SysRq key combinations work, but usually
> they don't, and I have to just turn the computer off.
>
> I reproduced this with 2.6.27.2 and 2.6.27.3, and then with 2.6.27 using a
> configuration closer to the one I use for 2.6.26.6.
>
> I set the severity to high because this makes 2.6.27 unusable for me.
>
> Steps to reproduce: hmm, guess I already said that.
Additional details are attached to the bugzilla report.
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