crash: _kvm_kvatop

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

-current/amd64 box (with nouveau) suddenly froze and after a long
while rebooted. savecore gave me

-rw-------  1 root  wheel           2 Mar 30 20:08 bounds
-rw-------  1 root  wheel  2957071680 Mar 30 20:12 netbsd.0.core.gz
-rw-------  1 root  wheel           0 Mar 30 20:12 netbsd.0.gz

a small kernel. Using the netbsd.gdb I think should go with it, gdb says

(gdb) target kvm netbsd.0.core
Cannot access memory at address 0xffffdd8278344930

and crash says:

# crash -M netbsd.0.core -N netbsd.gdb 
Crash version 9.99.52, image version 9.99.52.
crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: trap
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NVGA_RASTERCONSOLE() at 0
crash: _kvm_kvatop(ffffdd8278344930)
crash: kvm_read(0xffffdd8278344930, 8): invalid translation (invalid level 2 PDE)

so presumably this core isn't useful?


Cheers,

Patrick