Re: port-amd64/50091

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

The following reply was made to PR port-amd64/50091; it has been noted by GNATS.

From: Patrick Welche <prlw1%cam.ac.uk@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-amd64/50091
Date: Tue, 28 Jul 2015 13:50:26 +0100

 Sadly kgdb is still broken for me even after this change. My gdb
 protocol trace is slightly different in that I have a "m" (read
 memory) rather than "p" (read register) after the "g" (read
 registers). This is today's current, so odd to see a difference:
 
 ...
 Sending packet: $qC#b4...Ack
 Packet received: 
 Sending packet: $qAttached#8f...Ack
 Packet received: 
 Packet qAttached (query-attached) is NOT supported
 Sending packet: $g#67...Ack
 Packet received: 0f000000000000002000000000000000000000000000000001000000000000000060f280ffffffff0000000000000000c09eee80ffffffffc09eee80ffffffff0060f280ffffffffd0070000000000000060f280ffffffff7300000000000000000000000000000000000000000000000000000000000000000000000000000035c31e80ffffffff860200000000000008000000000000001000000000000000
 Sending packet: $m80f26000,1#90...Ack
 Timed out.
 
 The time out is because the target panics with a
 
 panic: lockdebug_lookup: uninitialized lock (lock=0xffffffff80d01448, from=fff807bc16a)
 
 after having just done a sys/arch/amd64/amd64/kgdb_machdep.c,
 kgdb_acc(va=0x80f26000,len=1)
 
 i.e., the panic happens in
 
 pte = kvtopte(va)      (as VM_MN_KERNEL_ADDRESS=0)
 
 (as per http://mail-index.netbsd.org/tech-kern/2015/07/09/msg019142.html)