[Bug 289651] scrub of read-only zpool hangs process

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289651

            Bug ID: 289651
           Summary: scrub of read-only zpool hangs process
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: ronald.w.taylor@gmail.com

A scrub was accidentally initiated on a zpool imported read-only consisting of
files (not actual block devices). Rather than refusing/aborting some way, it
instead created an unkillable process hung in D+ state. The pool can no longer
be exported (not even with -f) and the process cannot be killed.

riviera:/root# ps auxwwwww | grep zmediabackup
root    42316    0.0  0.0  20672   8580  0  D+   12:14     0:00.00 zpool scrub
zmediabackup

riviera:/root# procstat -kk 42316
  PID    TID COMM                TDNAME              KSTACK
42316 100724 zpool               -                   mi_switch+0xbd
_cv_wait+0xfb txg_wait_synced_impl+0xb9 txg_wait_synced+0xb
dsl_sync_task_common+0x1fa dsl_sync_task+0x17 dsl_scan+0x18a
zfs_ioc_pool_scrub+0xa0 zfsdev_ioctl_common+0x58f zfsdev_ioctl+0x11d
devfs_ioctl+0xcb vn_ioctl+0xc8 devfs_ioctl_f+0x1e kern_ioctl+0x255
sys_ioctl+0x101 amd64_syscall+0x117 fast_syscall_common+0xf8

riviera:/root# zpool list -o name,size,alloc,frag,cap,health,readonly
zmediabackup
NAME           SIZE  ALLOC   FRAG    CAP    HEALTH  RDONLY
zmediabackup  1016G      0     0%     0%    ONLINE  on

riviera:/root# zpool status zmediabackup
  pool: zmediabackup
 state: ONLINE
config:

        NAME                                    STATE     READ WRITE CKSUM
        zmediabackup                            ONLINE       0     0     0
          /workspc/zmediabackup/zmediabackup-1  ONLINE       0     0     0
          /workspc/zmediabackup/zmediabackup-2  ONLINE       0     0     0
          /workspc/zmediabackup/zmediabackup-3  ONLINE       0     0     0
          /workspc/zmediabackup/zmediabackup-4  ONLINE       0     0     0

errors: No known data errors

Expected result should be that any attempt to scrub or resilver a read-only
pool should fail or return an appropriate error message rather than create a
hung process.

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