filesystem deadlock, process in vodead state

[Dmitriy Makarov]

Hi,

we has exactly the same issue on our two boxes, running CURRENT. 
But in our case stuck is on read one exactly file:  ls $file - works fine,
cat $file - hang.
The file is on ZFS pool, stripe of mirrors too.

The first box:   FreeBSD 11.0-CURRENT #0 r290331  (uptime 15 days)

[box92:~]$ ps auxwww|grep cat
root   21344    0,0  0,0   8256   2012  6- D+J  13:52        0:00,00 cat
.main.lock

[box92:~]# procstat -kk 21344
  PID    TID COMM             TDNAME           KSTACK
21344 103410 cat              -                mi_switch+0xd8
sleepq_wait+0x3a _sleep+0x2df vnode_create_vobject+0x131
zfs_freebsd_open+0xf6 VOP_OPEN_APV+0xa0 vn_open_vnode+0x26a
vn_open_cred+0x33e kern_openat+0x25f amd64_syscall+0x50b Xfast_syscall+0xfb

[box92:~]# procstat -t 21344
  PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN
21344 103410 cat              -                 -1  120 sleep   vodead

[box92:~]# procstat -S 21344
  PID    TID COMM             TDNAME           CPU CSID CPU MASK
21344 103410 cat              -                 -1    6 0-11

[box92:~]# procstat -H 21344
  PID  PPID  PGID   SID  TSID THR LOGIN    WCHAN     EMUL          COMM
21344 84508 21344  9350  9350   1 endo     vodead    FreeBSD ELF64 cat

[box92:~]# procstat -f 21344
  PID COMM                FD T V FLAGS    REF  OFFSET PRO NAME
21344 cat               text v r r-------   -       - -  
/var/jail64/jail1/bin/cat
21344 cat                cwd v d r-------   -       - -  
/var/jail64/jail1/var/mail/path
21344 cat               root v d r-------   -       - -   /var/jail64/jail1
21344 cat               jail v d r-------   -       - -   /var/jail64/jail1
21344 cat                  0 v x rwa-----  18  635287 -   -
21344 cat                  1 v x rwa-----  18  635287 -   -
21344 cat                  2 v x rwa-----  18  635287 -   -

The second box running  FreeBSD 11.0-CURRENT #0 r287745  (uptime 51 days)

I'm not familiar with debugging tools, but ready to help if somebody
interesting. 



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