[PVE-User] zfs inappropriate ioctl for device

[Phil Kauffman]

I use my proxmox node at home to host VM's but also for my main ZFS array.

I use a tool called 'znapzend' to mirror various datasets to other servers.

Recently I noticed the following issue while using the 'znapzendzetup' command. 'znapzendzetup' will show you the backup plans you have set for any dataset.

I was hoping someone could help me troubleshoot this issue. It feels very much like this one (https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1763067), but I'm not sure.

  # znapzendzetup list
  # ... it just hangs here

  OK. so strace it...
  # strace znapzendzetup list


Here are the last few lines of the above strace
<snip>
read(6, "", 4)                          = 0
close(6)                                = 0
ioctl(4, TCGETS, 0x7ffef62d8970)        = -1 ENOTTY (Inappropriate ioctl for device)
lseek(4, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
read(4, "org.znapzend:dst_a_plan\t60minute"..., 8192) = 577
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=28633, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
rt_sigreturn({mask=[]})                 = 0
read(4, "", 8192)                       = 0
close(4)                                = 0
wait4(28633, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 28633
stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=3585, ...}) = 0
pipe([4, 5])                            = 0
pipe([6, 7])                            = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fb932193590) = 28634
close(7)                                = 0
close(5)                                = 0
read(6, "", 4)                          = 0
close(6)                                = 0
ioctl(4, TCGETS, 0x7ffef62d8970)        = -1 ENOTTY (Inappropriate ioctl for device)
lseek(4, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
read(4, "tank/audio\n", 8192)           = 11
read(4, "", 8192)                       = 0
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=28634, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
rt_sigreturn({mask=[]})                 = 0
close(4)                                = 0
wait4(28634, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 28634
pipe([4, 5])                            = 0
pipe([6, 7])                            = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fb932193590) = 28635
close(7)                                = 0
close(5)                                = 0
read(6, "", 4)                          = 0
close(6)                                = 0
ioctl(4, TCGETS, 0x7ffef62d8970)        = -1 ENOTTY (Inappropriate ioctl for device)
lseek(4, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
read(4,
</snip>


# uname -a
Linux luna 4.15.18-8-pve #1 SMP PVE 4.15.18-28 (Tue, 30 Oct 2018 14:27:50 +0100) x86_64 GNU/Linux

# dmesg| grep ZFS
[    7.059616] ZFS: Loaded module v0.7.11-1, ZFS pool version 5000, ZFS filesystem version 5



# zpool status
  pool: proxmox
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: scrub repaired 0B in 0h54m with 0 errors on Sun Nov 11 01:18:13 2018
config:

        NAME                                         STATE     READ WRITE CKSUM
        proxmox                                      ONLINE       0     0     0
          mirror-0                                   ONLINE       0     0     0
            <redacted_ssd1>  ONLINE       0     0     0
            <redacted_ssd2>  ONLINE       0     0     0

errors: No known data errors

  pool: tank
 state: ONLINE
  scan: scrub repaired 0B in 17h32m with 0 errors on Sun Nov 11 17:57:00 2018
config:

        NAME                                   STATE     READ WRITE CKSUM
        tank                                   ONLINE       0     0     0
          raidz2-0                             ONLINE       0     0     0
            <redacted_hdd1>  ONLINE       0     0     0
            <redacted_hdd2>  ONLINE       0     0     0
            <redacted_hdd3>  ONLINE       0     0     0
            <redacted_hdd4>  ONLINE       0     0     0


Cheers,

Phil