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Date: Tue, 17 May 2011 17:17:16 -0400
From: Gary Palmer <gpalmer@freebsd.org>
To: a.smith@ukgrid.net
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Cc: freebsd-fs@FreeBSD.org, Andriy Gapon <avg@FreeBSD.org>
Subject: Re: zfs get all command hung
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On Tue, May 17, 2011 at 09:54:12PM +0100, a.smith@ukgrid.net wrote:
> Quoting Andriy Gapon <avg@FreeBSD.org>:
> >
> >procstat -kk <pid>
> >
> 
> # procstat -kk 37975
>   PID    TID COMM             TDNAME           KSTACK
> 37975 100669 zfs              -                mi_switch+0x176  
> sleepq_catch_signals+0x29e sleepq_wait_sig+0x16 _sleep+0x269  
> clnt_vc_create+0x153 clnt_reconnect_call+0x64d nfs_request+0x215  
> nfs_statfs+0x194 __vfs_statfs+0x28 kern_getfsstat+0x3fc  
> syscallenter+0x1e5 syscall+0x4b Xfast_syscall+0xe2
> 
> And actually I was thinking, as the all zfs get commands are hanging,  
> I can run others and truss them of course. Here is the tail of a truss:
> 
> 
> NAME  PROPERTY              VALUE                  SOURCE
> write(1,"NAME  PROPERTY              VALU"...,58) = 58 (0x3a)
> mx1   type                  filesystem             -
> write(1,"mx1   type                  file"...,53) = 53 (0x35)
> mx1   creation              Mon Jan 17 12:08 2011  -
> write(1,"mx1   creation              Mon "...,53) = 53 (0x35)
> mx1   used                  78.2G                  -
> write(1,"mx1   used                  78.2"...,53) = 53 (0x35)
> mx1   available             195G                   -
> write(1,"mx1   available             195G"...,53) = 53 (0x35)
> mx1   referenced            22K                    -
> write(1,"mx1   referenced            22K "...,53) = 53 (0x35)
> mx1   compressratio         1.27x                  -
> write(1,"mx1   compressratio         1.27"...,53) = 53 (0x35)
> fstat(4,{ mode=crw-rw-rw- ,inode=32,size=0,blksize=4096 }) = 0 (0x0)
> ioctl(4,TIOCGETA,0xffffc8c0)                     ERR#19 'Operation not  
> supported by device'
> lseek(4,0x0,SEEK_SET)                            = 0 (0x0)
> lseek(4,0x0,SEEK_CUR)                            = 0 (0x0)
> getfsstat(0x0,0x0,0x1,0x0,0x80,0xa008)           = 443 (0x1bb)


I'm no expert, but it looks more like you have a NFS filesystem mounted
on the system and for some reason system calls to list the mounted
filesystems are hanging due to the NFS mount.  Is there a NFS filesystem
mounted on that box and is the NFS server available and responding to
NFS requests?

Gary