[Bug 230220] UFS: the freezing ioctl (i.e.UFSSUSPEND) causes panic or EBUSY

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230220

--- Comment #2 from Dexuan Cui <decui at microsoft.com> ---
(In reply to Dexuan Cui from comment #0)

If there is only one mount point (i.e. /), I can't reproduce the panic.
The panic only happens after I mount /dev/da2p1 on /mnt.

The panic is caused by the failure of the KASSERT ffs_susp_ioctl():

case UFSSUSPEND:
        fsidp = (fsid_t *)addr;
        mp = vfs_getvfs(fsidp);
        if (mp == NULL) {
                error = ENOENT;
                break;
        }
        error = vfs_busy(mp, 0);
        vfs_rel(mp);
        if (error != 0)
                break;
        error = ffs_susp_suspend(mp);
        if (error != 0) {
                vfs_unbusy(mp);
                break;
        }
        error = devfs_set_cdevpriv(mp, ffs_susp_dtor);
        KASSERT(error == 0, ("devfs_set_cdevpriv failed"));
        break;

When the UFSSUSPEND ioctl is called for the second time, devfs_set_cdevpriv()
returns EBUSY.

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