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kgdb expected to work?
I'm doing something a little weird, so before trying to debug it (in
specific), I wanted to see if anyone actually _uses_ kgdb successfully
at all these days. Note that I haven't actually used kgdb since
dual-serial-port boxes were the norm (probably 2002 or so), so I'm quite
rusty.
I'm running some VMs under VMWare Fusion on MacOSX - and it just
occurred to me that I might be able to debug using kgdb under serial
port emulation. A couple folks gave me some pointers, and I have things
kind-of-sort-of working in that I can attach GDB and "continue"
execution of the kernel.
However!
when I launch the kernel (basically GENERIC with DDB removed and KGDB
enabled at 115200) with "boot -d", I get the following on console:
kgdb waiting...fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c057224c cs 8 eflags 296 cr2 0 ilevel 8
...I can actually attach gdb at that point, which I do. (This is a
cross-gdb running under MacOS, built with MKCROSSGDB=yes from the same
src tree as the kernel)
Like so:
(gdb) set remotebreak 1
(gdb) set remotebaud 115200
(gdb) target remote 127.0.0.1:12303
(gdb)
(port 12303 is where I have the emulated serial port listening via tcp).
If I type "continue", the kernel seems to run. However, if I try to set
a breakpoint, I get a trap on console when I would expect the breakpoint
to hit, and gdb never returns. I also can't seem to manually break. I
should also note that I get the same behavior in 5.1 and -current.
So...
Does KGDB actually still work for people? Is there anything else anyone
can suggest to try? I'm not great with gdb, so it's entirely possible
I'm doing something braindead.
Thanks!
+j
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