Re: processes stuck in kqread

kevin kramer wrote this message on Wed, Jul 18, 2007 at 11:10 -0500:
> I have been having issues for some time on -CURRENT. My latest update 
> was 7/11. I have identified these processes as being stuck in kqread 
> while waiting for them to continue.
> 
> Processes that I know are a problem:
> sshd - I can watch a login and the process goes from Select to kqread, 
> takes about 3-4 minutes to get a login prompt
> top - takes about 2-3 minutes to come up
> tar - never really even starts to read data in and stays in kqread
> 
> Processes not affected:
> scp
> gstat
> cvsup
> make
> 
> This machine is running AMD64 GENERIC kernel on a Dual-Core Xeons.
> dmesg.txt and top-trace.txt here, http://users.centtech.com/~kramer/snapshot
> 
> What do I do to debug this?

running the process under ktrace would help identify what it is waiting
for...  Though if it usually hangs for a minute or two in kqread, and
then continues, it's probably a DNS lookup issue...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."