Serious issue with serial console in 5.4

[Kris Kennaway]

On Mon, Jul 18, 2005 at 11:58:54AM +0200, Eirik ?verby wrote:
> Hi,
> 
> I reported this before, but I am very surprised that it is still the  
> case:
> 
> (This is from the last time it happened; this time the box rebooted  
> and cleared the serial console before I had time to cut/paste it.
> >Fatal trap 12: page fault while in kernel mode
> >cpuid = 1; apic id = 00
> >fault virtual address   = 0x1c
> >fault code              = supervisor write, page not present
> >instruction pointer     = 0x8:0xc0620b5f
> >stack pointer           = 0x10:0xdadbd988
> >frame pointer           = 0x10:0xdadbd994
> >code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                       = DPL 0, pres 1, def32 1, gran 1
> >processor eflags        = interrupt enabled, resume, IOPL = 0
> >current process         = 51999 (getty)
> >trap number             = 12
> >panic: page fault
> >cpuid = 1
> >boot() called on cpu#0
> >Uptime: 66d11h24m50s
> 
> The above panic will show up occasionally when logging out from a  
> serial console (i.e. ctrl-D, logout, exit, whatever). This is  
> EXTREMELY BAD, as it will crash an otherwise perfectly healthy box at  
> random - and renders the serial console useless.
> 
> Robert Watson confirmed this to be an issue on the 10th of April.
> 
> Anyone??

You might have to wait until 6.0-R since fixing it seems to require
infrastructure changes that cannot easily be backported to 5.x.

Kris
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