processes stuck in kqread

[Kevin Kramer]

that was it. I had a nisdomain set in my rc.conf, but no client 
configuration lines. I've commented it all out and all is well.

thanks.

_________________________________________________
Kevin Kramer		Sr. Systems Administrator
Centaur Technology, Inc.
Office: 512-418-5725	Cell  : 512-470-7671
http://www.centtech.com
_________________________________________________



John-Mark Gurney wrote the following on 07/22/07 20:10:
> Eric Anderson wrote this message on Sun, Jul 22, 2007 at 16:27 -0500:
>   
>> John-Mark Gurney wrote:
>>     
>>> 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...
>>>
>>>       
>> You mean like the one he put here:
>>
>> http://users.centtech.com/~kramer/snapshot/top-trace.txt
>>     
>
> /me needs to read closer.
>
> Thought it might be a yp issue:
>  84667 top      0.005085 CALL  open(0x7fffffffdd00,O_RDONLY,<unused>0x1e)
>  84667 top      0.005091 NAMI  "/var/yp/binding/centtech.com.2"
>  84667 top      0.005105 RET   open -1 errno 2 No such file or directory
> [...]
>  84667 top      0.005461 CALL  socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP)
>  84667 top      0.005468 RET   socket 5
> [...]
>  84667 top      0.005533 CALL  bind(0x5,0x7fffffffda10,0x10)
>  84667 top      0.005542 RET   bind 0
> [...]
>  84667 top      0.006028 CALL  sendto(0x5,0x800c11ac4,0x38,0,0x800c11808,0x10)
>
>   
>>  84667 top      0.006110 RET   sendto 56/0x38
>>  84667 top      0.006128 CALL 
>> kevent(0x6,0x800c11910,0x1,0x7fffffffdad0,0x1,0x7fffffffdb10)
>>  84667 top      5.008057 GIO   fd 6 wrote 32 bytes
>>        0x0000 0500 0000 0000 0000 ffff 0100 0000 0000 0000 0000 0000 
>> 0000 0000 0000 0000 0000 
>> |................................|
>>
>>  84667 top      5.008073 GIO   fd 6 read 0 bytes
>>        ""
>>  84667 top      5.008078 RET   kevent 0
>>  84667 top      5.008086 CALL  gettimeofday(0x7fffffffdb20,0)
>>  84667 top      5.008091 RET   gettimeofday 0
>>  84667 top      5.008096 CALL 
>> sendto(0x5,0x800c11ac4,0x38,0,0x800c11808,0x10)
>>  84667 top      5.008139 GIO   fd 5 wrote 56 bytes
>>        0x0000 4696 2a64 0000 0000 0000 0002 0001 86a0 0000 0002 0000 
>> 0003 0000 0000 0000 0000 0000 0000 0000 0000 
>> |F.*d....................................|
>>        0x0028 0001 86a7 0000 0002 0000 0006 0000 0000 
>>                                             |................|
>>
>>  84667 top      5.008155 RET   sendto 56/0x38
>>  84667 top      5.008163 CALL 
>> kevent(0x6,0x800c11910,0,0x7fffffffdad0,0x1,0x7fffffffdb10)
>>  84667 top      15.007883 GIO   fd 6 wrote 0 bytes
>>        ""
>>     
>
> Looks like it's trying to contact the yp server and isn't getting a
> response...  Check your user/host name lookup...
>
>