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.
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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