Stuck CLOSED sockets / sshd / zombies...
Karl Pielorz
kpielorz_lst at tdx.co.uk
Wed Apr 2 16:55:45 UTC 2014
--On 2 April 2014 11:30:39 -0400 John Baldwin <jhb at freebsd.org> wrote:
>> # ps ax | grep 4344
>> ps axl | grep 4344
>> 0 4344 895 0 20 0 84868 6944 urdlck Is - 0:00.01 sshd:
>> unknown [priv] (sshd)
>
> Can you get 'procstat -k 4344' to see where this process is stuck?
Sure,
"
# procstat -k 4344
PID TID COMM TDNAME KSTACK
4344 100068 sshd - mi_switch
sleepq_catch_signals sleepq_wait_sig _sleep umtxq_sleep do_rw_rdlock
__umtx_op_rw_rdlock amd64_syscall Xfast_syscall
"
>> 22 4345 4344 0 20 0 0 0 - Z - 0:00.00 <defunct>
>> 0 4346 4344 0 21 0 84868 6952 sbwait I - 0:00.00 sshd:
>> unknown [pam] (sshd)
>
> 'procstat -f' and 'procstat -k' for this process might also be useful.
Ok, think you mean PID 4346?
"
# procstat -f 4346
PID COMM FD T V FLAGS REF OFFSET PRO NAME
4346 sshd text v r r------- - - - /usr/sbin/sshd
4346 sshd cwd v d r------- - - - /
4346 sshd root v d r------- - - - /
4346 sshd 0 v c rw------ 6 0 - /dev/null
4346 sshd 1 v c rw------ 6 0 - /dev/null
4346 sshd 2 v c rw------ 6 0 - /dev/null
4346 sshd 3 s - rw---n-- 2 0 TCP 192.168.0.138:22
192.168.0.45:54588
4346 sshd 5 p - rw------ 2 0 - -
4346 sshd 6 s - rw------ 2 0 UDS -
4346 sshd 7 p - rw------ 1 0 - -
4346 sshd 8 s - rw------ 2 0 UDS -
"
"
# procstat -k 4346
PID TID COMM TDNAME KSTACK
4346 100100 sshd - mi_switch
sleepq_catch_signals sleepq_wait_sig _sleep sbwait soreceive_generic
dofileread kern_readv sys_read amd64_syscall Xfast_syscall
"
In case it's relevant, one of the -xen guys originally said "It seems like
the process is stuck while trying to acquire a rw mutex in
read mode." [from when I thought it might be a -xen issue, which it's
obviously not]
If you want / need any more stuff running - let me know,
-Karl
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