On Mon, Sep 24, 2012 at 11:13 PM, Ian Kent <raven@xxxxxxxxxx> wrote:
> On Mon, 2012-09-24 at 17:14 -0300, Leonardo Chiquitto wrote:
>> Hi,
>>
>> If you try to access an automounted directory and the mount operation fails,
>> the attributes of the directory (owner, group, mode, access time) are lost.
>> This happens only when AutoFS' browse mode (ghosting) is enabled.
>>
>> How to reproduce the problem:
>>
>> Make sure you have BROWSE_MODE="yes" in /etc/sysconfig/autofs.
>>
>> 1. Add a simple indirect mount map (it's required that the server does NOT
>> export the /notexported directory):
>>
>> # cat /etc/auto.master
>> /nfs /etc/auto.nfs
>>
>> # cat /etc/auto.nfs
>> v2 server:/notexported
>>
>> 2. Restart AutoFS and try to access the directory:
>>
>> # cd /nfs/v2
>> -bash: cd: /nfs/v2: No such file or directory
>>
>> # ls -la /nfs
>> ls: cannot access /nfs/v2: No such file or directory
>> total 4
>> drwxr-xr-x 3 root root 0 Sep 24 21:43 .
>> drwxr-xr-x 28 root root 4096 Sep 24 21:25 ..
>> d????????? ? ? ? ? ? v2
>>
>> This problem is reproducible on recent upstream kernels such as 3.6.0-rc6.
>> I found out that the last kernel version that does not exhibit the bug is
>> 2.6.37. Between 2.6.37 and 2.6.38 there were quite some changes in
>> AutoFS/VFS and my attempts to bisect the problem were frustrated by
>> early crashes.
>>
>> Any ideas?
>
> Not really.
>
> It would be best to start with an full autofs debug log so we can see
> what is happening within automount and work back from there. We'll
> probably need to look at the dentry itself as well to see if we can get
> any info about where it came from possibly, with a kernel dump.
>
> Ian
Hi Ian,
Here are the debug logs from automount and a snapshot of the dentry
and inode of the "broken" directory (running 2.6.38).
I tried to compare it with 2.6.37 (which works), but the structures
changed a lot between these kernels.
## starting up
Sep 25 13:44:30 n1 automount[2337]: Starting automounter version
5.0.7, master map auto.master
Sep 25 13:44:30 n1 automount[2337]: using kernel protocol version 5.02
Sep 25 13:44:30 n1 automount[2337]: lookup_nss_read_master: reading
master files auto.master
Sep 25 13:44:30 n1 automount[2337]: parse_init: parse(sun): init
gathered global options: (null)
Sep 25 13:44:30 n1 automount[2337]: spawn_mount: mtab link detected,
passing -n to mount
Sep 25 13:44:30 n1 automount[2337]: spawn_umount: mtab link detected,
passing -n to mount
Sep 25 13:44:30 n1 automount[2337]: lookup_read_master: lookup(file):
read entry /nfs
Sep 25 13:44:30 n1 automount[2337]: master_do_mount: mounting /nfs
Sep 25 13:44:30 n1 automount[2337]: automount_path_to_fifo: fifo name
/run/autofs.fifo-nfs
Sep 25 13:44:30 n1 automount[2337]: lookup_nss_read_map: reading map
file /etc/auto.nfs
Sep 25 13:44:30 n1 automount[2337]: parse_init: parse(sun): init
gathered global options: (null)
Sep 25 13:44:30 n1 automount[2337]: spawn_mount: mtab link detected,
passing -n to mount
Sep 25 13:44:30 n1 automount[2337]: spawn_umount: mtab link detected,
passing -n to mount
Sep 25 13:44:30 n1 automount[2337]: mounted indirect on /nfs with
timeout 60, freq 15 seconds
Sep 25 13:44:30 n1 automount[2337]: st_ready: st_ready(): state = 0 path /nfs
Sep 25 13:44:30 n1 automount[2337]: ghosting enabled
## ls /nfs/v2
Sep 25 13:44:44 n1 automount[2337]: handle_packet: type = 3
Sep 25 13:44:44 n1 automount[2337]: handle_packet_missing_indirect:
token 6, name v2, request pid 2352
Sep 25 13:44:44 n1 automount[2337]: attempting to mount entry /nfs/v2
Sep 25 13:44:44 n1 automount[2337]: lookup_mount: lookup(file): looking up v2
Sep 25 13:44:44 n1 automount[2337]: lookup_mount: lookup(file): v2 ->
server:/nfs
Sep 25 13:44:44 n1 automount[2337]: parse_mount: parse(sun): expanded
entry: server:/nfs
Sep 25 13:44:44 n1 automount[2337]: parse_mount: parse(sun): gathered options:
Sep 25 13:44:44 n1 automount[2337]: parse_mount: parse(sun):
dequote("server:/nfs") -> server:/nfs
Sep 25 13:44:44 n1 automount[2337]: parse_mount: parse(sun): core of
entry: options=, loc=server:/nfs
Sep 25 13:44:44 n1 automount[2337]: sun_mount: parse(sun): mounting
root /nfs, mountpoint v2, what server:/nfs, fstype nfs, options (null)
Sep 25 13:44:44 n1 automount[2337]: mount_mount: mount(nfs): root=/nfs
name=v2 what=server:/nfs, fstype=nfs, options=(null)
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: called with host
server(10.1.1.4) proto tcp version 0x30
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: nfs v3 rpc ping time: 0.000214
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: nfs v2 rpc ping time: 0.000114
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: host server cost 164 weight 0
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: called with host
server(10.1.1.4) proto udp version 0x30
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: nfs v3 rpc ping time: 0.001836
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: nfs v2 rpc ping time: 0.000095
Sep 25 13:44:44 n1 automount[2337]: get_nfs_info: host server cost 965 weight 0
Sep 25 13:44:44 n1 automount[2337]: prune_host_list: selected subset
of hosts that support NFS3 over TCP
Sep 25 13:44:44 n1 automount[2337]: mount_mount: mount(nfs): calling
mkdir_path /nfs/v2
Sep 25 13:44:44 n1 automount[2337]: mount_mount: mount(nfs): calling
mount -t nfs server:/nfs /nfs/v2
Sep 25 13:44:44 n1 automount[2337]: spawn_mount: mtab link detected,
passing -n to mount
Sep 25 13:44:44 n1 checkproc: checkproc: Empty pid file
/var/run/rpc.statd.pid for /usr/sbin/rpc.statd
Sep 25 13:44:44 n1 start_daemon: start_daemon: Empty pid file
/var/run/rpc.statd.pid for /usr/sbin/rpc.statd
Sep 25 13:44:44 n1 rpc.statd[2369]: Version 1.2.6 starting
Sep 25 13:44:44 n1 rpc.statd[2369]: Flags: TI-RPC
Sep 25 13:44:44 n1 automount[2337]: >> Starting rpc.statd .....done
Sep 25 13:44:44 n1 automount[2337]: >> mount.nfs: access denied by
server while mounting server:/nfs
Sep 25 13:44:44 n1 automount[2337]: mount(nfs): nfs: mount failure
server:/nfs on /nfs/v2
Sep 25 13:44:44 n1 automount[2337]: dev_ioctl_send_fail: token = 6
Sep 25 13:44:44 n1 automount[2337]: failed to mount /nfs/v2
Sep 25 13:44:54 n1 automount[2337]: st_expire: state 1 path /nfs
Sep 25 13:44:54 n1 automount[2337]: expire_proc: exp_proc =
140484187907840 path /nfs
Sep 25 13:44:54 n1 automount[2337]: expire_cleanup: got thid
140484187907840 path /nfs stat 0
Sep 25 13:44:54 n1 automount[2337]: expire_cleanup: sigchld: exp
140484187907840 finished, switching from 2 to 1
Sep 25 13:44:54 n1 automount[2337]: st_ready: st_ready(): state = 2 path /nfs
Sep 25 13:45:09 n1 automount[2337]: st_expire: state 1 path /nfs
Sep 25 13:45:09 n1 automount[2337]: expire_proc: exp_proc =
140484187907840 path /nfs
Sep 25 13:45:09 n1 automount[2337]: expire_cleanup: got thid
140484187907840 path /nfs stat 0
Sep 25 13:45:09 n1 automount[2337]: expire_cleanup: sigchld: exp
140484187907840 finished, switching from 2 to 1
Sep 25 13:45:09 n1 automount[2337]: st_ready: st_ready(): state = 2 path /nfs
## ls -la /nfs
Sep 25 13:45:12 n1 automount[2337]: handle_packet: type = 3
Sep 25 13:45:12 n1 automount[2337]: handle_packet_missing_indirect:
token 7, name v2, request pid 2397
Sep 25 13:45:12 n1 automount[2337]: dev_ioctl_send_fail: token = 7
dentry and inode (/nfs/v2) from a v2.6.38 kernel, after triggering
the mount:
struct dentry {
d_flags = 393216,
d_seq = {
sequence = 4
},
d_hash = {
next = 0x0,
pprev = 0xffffc900011f5680
},
d_parent = 0xffff880478fcb0c0,
d_name = {
hash = 238128,
len = 2,
name = 0xffff880478fcb3f8 "v2"
},
d_inode = 0xffff8804944693e0,
d_iname = "v2\000\000\065\060\066\062\061\062fb\000Q\246\357\001\000\000\000\000\000\000\000\000\000\000\000\000\000\000",
d_count = 1,
d_lock = {
{
rlock = {
raw_lock = {
slock = 8650884
}
}
}
},
d_op = 0xffffffffa01f0940,
d_sb = 0xffff880496c8f400,
d_time = 0,
d_fsdata = 0xffff880497262540,
d_lru = {
next = 0xffff880478fcb440,
prev = 0xffff880478fcb440
},
d_u = {
d_child = {
next = 0xffff880478fcb2d0,
prev = 0xffff880478fcb160
},
d_u = {
d_child = {
next = 0xffff880478fcb2d0,
prev = 0xffff880478fcb160
},
d_rcu = {
next = 0xffff880478fcb2d0,
func = 0xffff880478fcb160
}
},
d_subdirs = {
next = 0xffff880478fcb460,
prev = 0xffff880478fcb460
},
d_alias = {
next = 0xffff880494469478,
prev = 0xffff880494469478
}
}
struct inode {
i_mode = 16749,
i_uid = 0,
i_gid = 0,
i_op = 0xffffffffa01f0880,
i_sb = 0xffff880496c8f400,
i_lock = {
{
rlock = {
raw_lock = {
slock = 65537
}
}
}
},
i_flags = 0,
i_mutex = {
count = {
counter = 1
},
wait_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
wait_list = {
next = 0xffff880494469410,
prev = 0xffff880494469410
},
owner = 0x0
},
i_state = 0,
dirtied_when = 0,
i_hash = {
next = 0x0,
pprev = 0x0
},
i_wb_list = {
next = 0xffff880494469448,
prev = 0xffff880494469448
},
i_lru = {
next = 0xffff880494469458,
prev = 0xffff880494469458
},
i_sb_list = {
next = 0xffff8804944a68d8,
prev = 0xffff880496c8f4c0
},
{
i_dentry = {
next = 0xffff880478fcb470,
prev = 0xffff880478fcb470
},
i_rcu = {
next = 0xffff880478fcb470,
func = 0xffff880478fcb470
}
},
i_ino = 120539,
i_count = {
counter = 1
},
i_nlink = 2,
i_rdev = 0,
i_blkbits = 10,
i_version = 0,
i_size = 0,
i_atime = {
tv_sec = 1348605652,
tv_nsec = 807650231
},
i_mtime = {
tv_sec = 1348605652,
tv_nsec = 807650231
},
i_ctime = {
tv_sec = 1348605652,
tv_nsec = 807650231
},
i_blocks = 0,
i_bytes = 0,
i_alloc_sem = {
count = 0,
wait_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
wait_list = {
next = 0xffff880494469500,
prev = 0xffff880494469500
}
},
i_fop = 0xffffffffa01f07a0,
i_flock = 0x0,
i_mapping = 0xffff880494469528,
i_data = {
host = 0xffff8804944693e0,
page_tree = {
height = 0,
gfp_mask = 32,
rnode = 0x0
},
tree_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
i_mmap_writable = 0,
i_mmap = {
prio_tree_node = 0x0,
index_bits = 1,
raw = 1
},
i_mmap_nonlinear = {
next = 0xffff880494469558,
prev = 0xffff880494469558
},
i_mmap_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
truncate_count = 0,
nrpages = 0,
writeback_index = 0,
a_ops = 0xffffffff81d79300,
flags = 131290,
backing_dev_info = 0xffffffff81a261c0,
private_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
private_list = {
next = 0xffff8804944695a0,
prev = 0xffff8804944695a0
},
assoc_mapping = 0x0,
unmap_mutex = {
count = {
counter = 1
},
wait_lock = {
{
rlock = {
raw_lock = {
slock = 0
}
}
}
},
wait_list = {
next = 0xffff8804944695c0,
prev = 0xffff8804944695c0
},
owner = 0x0
}
},
i_dquot = {0x0, 0x0},
i_devices = {
next = 0xffff8804944695e8,
prev = 0xffff8804944695e8
},
{
i_pipe = 0x0,
i_bdev = 0x0,
i_cdev = 0x0
},
i_generation = 0,
i_fsnotify_mask = 0,
i_fsnotify_marks = {
first = 0x0
},
i_writecount = {
counter = 0
},
i_security = 0x0,
i_acl = 0xffffffffffffffff,
i_default_acl = 0xffffffffffffffff,
i_private = 0x0
}
Thanks,
Leonardo
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