Re: port-sun3/48432: System hangs under light load

[John Carr <jcarr%poethecat.com@localhost>]

The following reply was made to PR port-sun3/48432; it has been noted by GNATS.

From: John Carr <jcarr%poethecat.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: David Holland <dholland-bugs%netbsd.org@localhost>, 
 port-sun3-maintainer%netbsd.org@localhost, gnats-admin%netbsd.org@localhost, 
 netbsd-bugs%netbsd.org@localhost
Subject: Re: port-sun3/48432: System hangs under light load
Date: Sun, 08 Dec 2013 11:15:45 -0500

 On 12/07/2013 11:35 AM, David Holland wrote:
 >   On Sat, Dec 07, 2013 at 03:40:00PM +0000, jcarr%poethecat.com@localhost 
 > wrote:
 >    > My guess would be that this is a kernel issue, but I'm not sure
 >    > what info to provide. More than happy to do so.
 >   
 >   First thing that comes to mind: is it unable to create processes (that
 >   is, things hang in fork) or are processes unable to exit, so that
 >   after a while the process table fills?
 >   
 >   Can you get ps output, perhaps from ddb?
 
 Sure thing. It's below. I'll leave it at the debugger prompt for later 
 troubleshooting.
 
 
 Stopped in pid 0.2 (system) at  netbsd:cpu_Debugger+0x6: unlk    a6
 db> ps
 PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 1081     1 3   0         0            e542600               cron vm_map
 1112     1 3   0        80            e543680               sshd netio
 539      1 3   0         0            e543c00               sshd vm_map
 970      1 3   0         0            e542b80               cron vm_map
 527      1 3   0         0            e4ea060               cron vm_map
 941      1 3   0         0            e5428c0               cron vm_map
 767      1 3   0        80            e341900             pickup kqueue
 758      1 3   0   1000000            e5433c0                csh vm_map
 945      1 3   0        80            e542e40               sshd select
 1008     1 3   0         0            e543940               cron vm_map
 903      1 3   0         0            e31f0a0              login vm_map
 722      1 3   0         0            e543100                csh vm_map
 558      1 3   0        80            e4ea5e0                top ttyout
 457      1 3   0        80            e4eb3a0                csh pause
 467      1 3   0         0            e4ea320       screen-4.0.3 vm_map
 468      1 3   0        80            e4eae20       screen-4.0.3 pause
 445      1 3   0        80            e4ea8a0                csh pause
 66       1 3   0        80            e4eb660                 su wait
 451      1 3   0        80            e4eb0e0                 sh wait
 452      1 3   0        80            e4eab60              login wait
 392      1 3   0        80            e340300            telnetd select
 389      1 3   0        80            e31ede0              getty ttyraw
 382      1 3   0        80            e340040               qmgr kqueue
 375      1 3   0         0            e4ebbe0               cron vm_map
 364      1 3   0        80            e4eb920              inetd kqueue
 346      1 3   0        80            e340e00             master kqueue
 117      1 3   0        80            e341640            syslogd kqueue
 1        1 3   0        80            e31e2e0               init wait
 0       36 3   0       200            e3405c0              nfsio nfsiod
 0       35 3   0       200            e340880              nfsio nfsiod
 0       34 3   0       200            e340b40              nfsio nfsiod
 0       33 3   0       200            e3410c0              nfsio nfsiod
 0       32 3   0       200            e341380            physiod physiod
 0       31 3   0       200            e31eb20           aiodoned aiodoned
 0       30 3   0       200            e31e5a0            ioflush syncer
 0       29 3   0       200            e31e860           pgdaemon pgdaemon
 0       26 3   0       200            e31e020              unpgc unpgc
 0       25 3   0       200            e341bc0        vmem_rehash 
 vmem_rehash
 0       16 3   0       200            e31f360           scsibus0 sccomp
 0       15 3   0       200            e31f620         pmfsuspend pmfsuspend
 0       14 3   0       200            e31f8e0           pmfevent pmfevent
 0       13 3   0       200            e31fba0         sopendfree sopendfr
 0       12 3   0       200            e304000           nfssilly nfssilly
 0       11 3   0       200            e3042c0            cachegc cachegc
 0       10 3   0       200            e304580              vrele vrele
 0        9 3   0       200            e304840             vdrain vdrain
 0        8 3   0       200            e304b00          modunload mod_unld
 0        7 3   0       200            e304dc0            xcall/0 xcall
 0        6 1   0       200            e305080          softser/0
 0        5 1   0       200            e305340          softclk/0
 0        4 1   0       200            e305600          softbio/0
 0        3 1   0       200            e3058c0          softnet/0
 0    >   2 7   0       201            e305b80             idle/0
 0        1 3   0       200            e1b5b20            swapper uvm