> >In gdb "bt" only shows two entries. The function where the panic > >occurred and 0x0! > > > > > > that is normal > you don't want to jump into gdb that soon. > there is hardly anything set up. > > use the sysctl to enter gdb later. > > >BTW, after boot -gd, when gdb attaches I have a kernel panic too. > >But I can just enter "continue" and the kernel continues booting. > >Is that ok? > > > > > > what do you mean "panic"? > I never use -gd, just -g > > then hitting ^ALT-ESC or using th esysctl makes me enter the debugger > when I need to. > > >
Ok,
may be, I am doing something stupidly wrong.
1. Added DIAGNOSTIC, USB_DEBUG, INVARIANT_SUPPORT, INVARIANTS to my
configuration
and installed a new debug kernel.
2. Booted the target to the loader prompt.
"unload kernel"
"load kerneld"
"boot -gd"
3. "gdb -k kernel.debug" & "target remote /dev/cuaa0" on my workstation.
4. Arrived in Debugger() and pressed "c".
5. The kernel booted. I saw the usual boot messages.
After seeing "IP filtering initialized...", I saw:
"panic: usb_cold_explore: busses to explore when !cold".
6. Found, that cold is indeed 0.
7. Booted again up to 4. and set a breakpoint at usb_cold_explore().
Pressed "c" and got (from gdb):
Continuing.
Cannot insert breakpoint 1:
Cannot access memory at address 0xc01e5a37.
At the same time the target console showed twice:
"Fatal trap 12: page fault..."
"..."
"supervisor read, page not present"
"..."
So, do I have something very wrong in my kernel configuration? (See attached
file)
What about HZ=400 and NO_SWAPPING? Any known problems?
Can't I set a breakpoint at that early stage of booting?
Thanks for any help,
Norbert
MOPSD
Description: Binary data
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