Kgdb kernel debugging appears to have been broken in 4.4-CURRENT for a week if not longer. The exact same config file works creating a debug kernel under 4.3. I've updated kernel, userland etc. The same thing happens under every virtualised environment I throw it at (vmware, qemu, virtualbox).

I get : 'com0: at isa0 port 0x3f8/8 irq 4panic: com_isa_attach: mapping failed ' followed by a kernel panic.

In 4.3 it correctly refers to 'pccom' and says that kgdb has been attached.

I can't be the only one needing to do kernel debugging with 4.4-CURRENT - am I missing something?

kernel config file is :

include "arch/i386/conf/GENERIC"

rmoption DDB
makeoptions DEBUG="-g"
option KGDB
option "KGDB_DEVNAME=\"com\"",KGDBADDR=0x3f8,KGDBRATE=9600

PK

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