kern/38684: zstty(4) freezes without LOCKDEBUG

[isaki%pastel-flower.jp@localhost]

>Number:         38684
>Category:       kern
>Synopsis:       zstty(4) freezes without LOCKDEBUG
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 18 12:00:01 +0000 2008
>Originator:     Tetsuya Isaki
>Release:        4.99.63
>Organization:
>Environment:
NetBSD/x68k - 4.99.63.
any configuration could not boot, so there is no uname.

>Description:
Using a GENERIC kernel, zstty @ zsc freezes while booting.
On the other hand, a GENERIC kernel with LOCKDEBUG,
zstty @ zsc passes successfully.

Here is a screen copy:
:
mfp0 at intio0 addr 0xe880000 intr 0x40
kbd0 at mfp0
clock0 at mfp0: MFP timer C
rtc0 at intio0 addr 0xe8a000: RP5C15
dmac0 at intio0 addr 0xe84000: HD63450 DMAC
dmac0: 4 channels avaialble.
zsc0 at intio0 addr 0xe98000 intr 0x70
zstty0 at zsc0 channel 0
>How-To-Repeat:
Boot GENERIC on x68k.
>Fix:
N/A