The
utility is a debugger based on
gdb(1)
that allows debugging of kernel core files.
The options are as follows:
-a
Increase the annotation level.
An annotation level of 1 features the historical
-fullname
option of
gdb(1).
This is useful when running
in Emacs.
The
-f
or
-fullname
options are supported for backward compatibility as well.
-q
Suppress printing of the banner when the debugger starts.
The
-quiet
form is supported for compatibility as well.
-v
Increase verbosity.
-w
Opens kmem-based targets in read-write mode.
(This is identical to what
--wcore
used to do in previous
gdb versions for
Fx . )
-d crashdir
Use
crashdir
instead of the default,
/var/crash
to locate kernel core dump files in.
The name
vmcore.
plus the dump number will be appended to determine
the actual dump file name.
-c core
Explicitly use
core
as the core dump file.
-n dumpnr
Use the kernel core dump file numbered
dumpnr
for debugging.
-r device
Use
device
to connect
to for a remote debugging session.
The
-c , n
and
-r
options are mutually exclusive.
Optionally, the name of the kernel symbol file and
the name of the core dump file can be supplied on the
command-line as positional arguments.
If no kernel symbol file name has been given, the
symbol file of the currently running kernel will be
used.
If no core dump file has been specified through either
of the options or the last command-line argument,
/dev/mem
will be opened to allow debugging the currently running
kernel.
FILES
/dev/mem
Default memory image to open if no core dump file
has been specified.
/var/crash
Default directory to locate kernel core dump files.
