ZFS deadlocked on zio->io_

[cjyar]

My nightly job has deadlocked on wchan "zio->io_". (I wasn't able to find that by grepping the kernel source.)

UID  PID  PPID CPU PRI NI  VSZ  RSS MWCHAN  STAT TT  TIME COMMAND
  0 61451 61447  0  52  0 24696 14644 zio->io_ D  -  0:09.17 find -sx / [...] /dev/null -type f ( -perm -u+x -or -perm -g+x -or -perm -o+x ) ( -perm -u+s -or -perm -g+s ) -exec ls -liTd {} +

This is 10.2-RELEASE, amd64.

Is anybody interested in investigating, or should I kill the process and reboot the server?

 

[LorenzoGaruti]

Hello cjyar,

i think you can follow the instruction on this post.

If not enough try to run the following command:

mount -t ufs,zfs | awk '$0 !~ /no(suid|exec)/ { print $3 }

the output may be like this:

/
/var
/tmp
/usr
/zfstank

if you wish to remove /zfstank from the nightly scan enter the following command:

zfs set exec=off zfstank

 

[cjyar]

Thanks Lorenzo, but I think the deadlock is a symptom of a deeper problem with ZFS. It seems like a very rare condition, so I'm not super concerned about it happening to me again.