https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230220
--- Comment #2 from Dexuan Cui <de...@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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