crashdumps not working

[Michael Nottebrock]

On Wednesday, 8. December 2004 12:20, Robert Watson wrote:
> On Tue, 7 Dec 2004, Michael Nottebrock wrote:
> > I recently enabled SW_WATCHDOG in my kernel, but when watchdog triggers
> > a panic, no crashdump is taken although dumps are enabled. What could be
> > causing this?
>
> If you drop to the debugger by using the debug.kdb.enter sysctl, and do
> "call doadump", followed by a reset, does a dump get generated
> successfully?

I don't have kdb enabled in my kernel configuration at all...

> I.e., are they completely broken on your system, or is this 
> somehow a property of the particular hang you're seeing.

See my other mail, a different (non-watchdog) panic didn't trigger a dump 
either. I even had the panic message in dmesg:

kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x14c
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc0521397
stack pointer           = 0x10:0xe9794b84
frame pointer           = 0x10:0xe9794b90
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 1281 (beep-media-player)
trap number             = 12
panic: page fault

Syncing disks, vnodes remaining...4 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
0

(I enabled kern.sync_on_panic only very recently for my experimenting with 
watchdog, dumping didn't work without it either).

-- 
   ,_,   | Michael Nottebrock               | lofi at freebsd.org
 (/^ ^\) | FreeBSD - The Power to Serve     | http://www.freebsd.org
   \u/   | K Desktop Environment on FreeBSD | http://freebsd.kde.org
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