[issue1137] Process stuck with an empty STATE

[Matthew Dillon]

:941f5de0 (around Oct. 10), but I can't find a relavant fix on
:DragonFly_RELEASE_2_0 branch.  I have another box running -DEVELOPMENT,
:but its uptime is probably not long enough to reproduce it.
:
:$ top -n -U qhwt 4
:load averages:  0.00,  0.00,  0.00  up 100+00:41:22    11:01:26
:78 processes:  78 running
:
:Mem: 116M Active, 210M Inact, 138M Wired, 16M Cache, 59M Buf, 1220K Free
:Swap: 2048M Total, 15M Used, 2033M Free
:
:
:  PID USERNAME  PRI NICE  SIZE    RES STATE    TIME   WCPU    CPU COMMAND
:63039 qhwt      179   0  2084K  1136K RUN      0:00 1161.00% 56.69% top
:18535 qhwt      159   0     0K     4K          0:00  0.00%  3.91% git
:18527 qhwt      159   0     0K     4K          0:00  0.00%  3.91% git
:18517 qhwt      157   0     0K     4K          0:00  0.00%  1.95% git
:
:I played with kgdb a bit and found that these 3 processes are on zombproc
:but with p_stat==SACTIVE and p_lock==1.  I have no idea how it happened.

    This should hopefully be fixed with this commit I made in December:

commit 2e425d87dc98885c44799de0327ab0013a7c34d6
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Dec 18 20:20:15 2008 -0800

    Close a possible bug where the p_lock for a new process inherits a
    non-zero value from its parent on fork(), preventing the process
    from being able to exit later on.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>