On Apr 10, 2005, at 1:42 PM, Robert Watson wrote:
On Sun, 10 Apr 2005 [EMAIL PROTECTED] wrote:
warning: This report might be somewhat vague. For quite a while
now I`ve been plagued with the problem that logging out from a
serial console causes the box to panic. For a while I`ve been sure
this was isolated to one of my boxen, because it`s been acting up
in other ways as well, but today it happened on two other boxes
too! And these boxes have been rock stable for the last two years.
I`m running a fairly recent variation of RELENG-5 on all the
boxes; one of them is amd64, the two others - including the one
I`ve pasted from - are plain old p3 machines. They are all dual-
CPU though.
I've seen precisely this panic -- in fact, I saw it yesterday on a
RELENG_5 box, and under identical circumstances -- it looks like it
happens if a last process in a login session on a serial console
closes the tty, and then getty re-opens it while there's console
output coming from syslog. I was able to get a core dump, but
haven't made much headway on it yet. It looks like the tty
structure has been released -- the refcount on the tty is 0, and
the mutex pointers in the kqueue state have been cleared (hence the
null pointer dereference you see). Now, the question is why --
I've added some debugging output to the local box I saw it on, and
will see if I can reproduce it.
Did you ever manage to reproduce - or fix - this? I had a rather
nasty incident recently due to this, even on a very recently updated
5.4. I sent a message to stable@ about it a few days ago, but have
received no response.
I personally think that this must be very very (very) bad - serial
consoles shouldn't do this! ;)
/Eirik
Robert N M Watson
I have no clue what I can do from here; has anyone seen this
before? I can`t
always reproduce it, but the risk is fairly high - around 33% I`d
say.
Anyone?
Thanks for your attention, details below.
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
/Eirik
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