New: kernel BUG when bringing down ppp connection
Subsystems (2)
A message that is not in the archive (sent off-list or not yet received): [email protected]/
(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface).
Quoted 17 lines · On Sat, 25 Oct 2008 17:34:16 -0700 (PDT) [email protected] 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: [email protected] ReportedBy: [email protected]
Quoted 2 lines
Latest working kernel version: 2.6.26.6
Earliest failing kernel version: 2.6.27
A regression.
Quoted 16 lines
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
Quoted 8 lines
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?
Quoted 7 lines
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.
Quoted 6 lines
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.
Quoted 5 lines
Quoted 3 lines
kernel BUG at
drivers/char/tty_ldisc.c:199!
invalid opcode: 0000 [1] PREEMPT SMP
CPU 1This has an Alany feel to it?
Ldisc refcount went negative. Will take a look at the bug report when I have time. First guess would be a bug in the specific USB serial driver - so need to know which driver is handlign the 26-183 and what is loaded (an lsmod would be handy)
Alan
Quoted 4 lines · Alan Cox
Ldisc refcount went negative. Will take a look at the bug report when I have time. First guess would be a bug in the specific USB serial driver - so need to know which driver is handlign the 26-183
pl2303
Quoted 2 lines
and what is loaded
(an lsmod would be handy)
the "Modules linked in" list is in the screen photos. I'll go get some real lsmod output if that's not enough.
Jason Cassell