[Gluster-users] Fwd: bug in 3.4.1 when creating symlinks

[Peter Drake]

I've included straces from both successful and unsuccessful exections, as
well as the PHP error information below.  Let me know if there is anything
else I can provide which would be helpful.

PHP Error (as provided by error_get_last()):

Array
(
    [type] => 2
    [message] => symlink(): No such file or directory
    [file] => /tmp/symlink-test.php
    [line] => 78
)

Straces on both clients for symlink creation which was unsuccessful on one
client:

Strace on unsuccessful client web-1:
lstat("/mnt/gfs/test1385000751", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
lstat("/tmp/test1385000751", 0x7fff2b5eb2e0) = -1 ENOENT (No such file or
directory)
lstat("/mnt/gfs/test1385000751", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
readlink("/mnt/gfs/test1385000751", 0x7fff2b5eb3f0, 4096) = -1 EINVAL
(Invalid argument)
lstat("/tmp/test1385000751", 0x7fff2b5ef2d0) = -1 ENOENT (No such file or
directory)
write(1, "Failed to create local link: /tm"..., 50) = 50

Strace on successful client web-2:
lstat("/mnt/gfs/test1385000751", 0x7fff3171b720) = -1 ENOENT (No such file
or directory)
lstat("/mnt/gfs/test1385000751", 0x7fff31717730) = -1 ENOENT (No such file
or directory)
symlink("/mnt/gfs/test-target", "/mnt/gfs/test1385000751") = 0
lstat("/mnt/gfs/test1385000751", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
lstat("/tmp/test1385000751", 0x7fff31717730) = -1 ENOENT (No such file or
directory)
lstat("/mnt/gfs/test1385000751", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
readlink("/mnt/gfs/test1385000751", "/mnt/gfs/test-target"..., 4096) = 20
symlink("/mnt/gfs/test1385000751", "/tmp/test1385000751") = 0
lstat("/tmp/test1385000751", {st_mode=S_IFLNK|0777, st_size=23, ...}) = 0


Straces on both clients for symlink creation which was successful on both
clients:

Strace on successful client web-1:
lstat("/mnt/gfs/test1385000727", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
lstat("/tmp/test1385000727", 0x7fff31717730) = -1 ENOENT (No such file or
directory)
lstat("/mnt/gfs/test1385000727", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
readlink("/mnt/gfs/test1385000727", "/mnt/gfs/test-target"..., 4096) = 20
symlink("/mnt/gfs/test1385000727", "/tmp/test1385000727") = 0
lstat("/tmp/test1385000727", {st_mode=S_IFLNK|0777, st_size=23, ...}) = 0

Strace on successful client web-2:
lstat("/mnt/gfs/test1385000727", 0x7fff2b5ef2d0) = -1 ENOENT (No such file
or directory)
lstat("/mnt/gfs/test1385000727", 0x7fff2b5eb2e0) = -1 ENOENT (No such file
or directory)
symlink("/mnt/gfs/test-target", "/mnt/gfs/test1385000727") = 0
lstat("/mnt/gfs/test1385000727", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
lstat("/tmp/test1385000727", 0x7fff2b5eb2e0) = -1 ENOENT (No such file or
directory)
lstat("/mnt/gfs/test1385000727", {st_mode=S_IFLNK|0777, st_size=20, ...}) =
0
readlink("/mnt/gfs/test1385000727", "/mnt/gfs/test-target"..., 4096) = 20
symlink("/mnt/gfs/test1385000727", "/tmp/test1385000727") = 0
lstat("/tmp/test1385000727", {st_mode=S_IFLNK|0777, st_size=23, ...}) = 0



On Wed, Nov 13, 2013 at 3:24 PM, Anand Avati <avati at gluster.org> wrote:

>
>
>
> On Wed, Nov 13, 2013 at 12:14 PM, Peter Drake <peter.drake at acquia.com>wrote:
>
>> Thanks for taking the time to look at this and reply.  To clarify, the
>> script that was running and created the log entries is an internal tool
>> which does lots of other, unrelated things, but the part that caused the
>> error takes actions very similar to the gist.  I tried to pull out the
>> related log entries to the best of my ability.  The script in the gist did
>> not create those log entries, but it does reliably reproduce the same error
>> / failure (failure when attempting to create a symlink from the local
>> filesystem to a symlink on the gluster filesystem).  I would not be
>> surprised if the PHP version of symlink has behavior that is different than
>> the symlink syscall.
>>
>>
> So what is the failure (errno) when creating a symlink from local fs to
> glusterfs? Can you get an strace of the script when the error happens?
>
> Avati
>



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