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Bug 1451173 - Object server tracebacks upon PUT with Permission denied on ARM
Summary: Object server tracebacks upon PUT with Permission denied on ARM
Keywords:
Status: CLOSED DUPLICATE of bug 1330705
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: glibc
Version: 7.0
Hardware: aarch64
OS: Linux
unspecified
unspecified
Target Milestone: pre-dev-freeze
: 7.4
Assignee: glibc team
QA Contact: qe-baseos-tools-bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-05-16 03:18 UTC by Pete Zaitcev
Modified: 2017-05-20 07:28 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-05-20 07:25:07 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
xattr test (871 bytes, text/x-python)
2017-05-18 02:37 UTC, Pete Zaitcev 		no flags Details
View All

Description Pete Zaitcev 2017-05-16 03:18:07 UTC 
Description of problem:

When uploading an object, object server tracebacks with:

  File "/usr/lib/python2.7/site-packages/swift/common/utils.py", line 3521, in tpool_reraise#012    raise resp
IOError: [Errno 13] Permission denied (txn: tx517e813d724a4481a0e15-005919fd6b)

Permissions are good. The problem looks like this on strace:

25227 mkdirat(AT_FDCWD, "/srv/node/1/objects/776/899/c2043124b796e5a2ef58e9b021752899", 0777) = -1 EEXIST (File exists)
25227 newfstatat(AT_FDCWD, "/srv/node/1/objects/776/899/c2043124b796e5a2ef58e9b021752899", {st_mode=S_IFDIR|0755, st_size=6, ...}, 0) = 0
25227 openat(AT_FDCWD, "/srv/node/1/objects/776/899/c2043124b796e5a2ef58e9b021752899", O_WRONLY|O_DIRECTORY|0x400000) = 8
25227 fstatfs64(8, {f_type=0x58465342, f_bsize=4096, f_blocks=13104640, f_bfree=10933659, f_bavail=10933659, f_files=26214400, f_ffree=26055164, f_fsid={2048, 0}, f_namelen=255, f_frsize=4096}) = 0
25227 fstat(8, {st_mode=S_IFREG, st_size=0, ...}) = 0
25227 fallocate(8, 01, 0, 735)          = 0
25227 sendto(5, "HTTP/1.1 100 Continue\r\n\r\n", 25, 0, NULL, 0) = 25
25227 recvfrom(5, 0x2d381a4, 735, 0, 0, 0) = -1 EAGAIN (Resource temporarily unavailable)
25227 ppoll([{fd=10, events=POLLIN|POLLPRI|POLLERR|POLLHUP}, {fd=4, events=POLLIN|POLLPRI|POLLERR|POLLHUP}, {fd=5, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 3, {59, 999000000}, NULL, 0) = 1 ([{fd=5, revents=POLLIN}], left {59, 997398680})
25227 recvfrom(5, "# Clear any old environment that"..., 735, 0, NULL, NULL) = 735
25227 write(8, "# Clear any old environment that"..., 735) = 735
25227 futex(0x3ff6c0014f0, FUTEX_WAKE_PRIVATE, 1) = 1
25227 ppoll([{fd=10, events=POLLIN|POLLPRI|POLLERR|POLLHUP}, {fd=4, events=POLLIN|POLLPRI|POLLERR|POLLHUP}], 2, {59, 994000000}, NULL, 0 <unfinished ...>
26368 <... futex resumed> )             = 0
26368 fsetxattr(8, "user.swift.metadata", "\x80\x02}q\x01(U\x0eContent-Lengthq\x02U\x03735U\x04nameq\x03U8/AUTH_3f06ccd97f4b444c8d62357dd5a687f0/admintest/stackrcq\x04U\x13X-Object-Meta-MtimeU\x111494875476.888270q\x05U\x04ETagq\x06U 23e2b66bc9643889b1ae0c84b7fa423cq\x07U\x0bX-Timestampq\x08U\x101494880812.53979U\x0cContent-Typeq\x09U\x18application/octet-streamq\x0au.", 262, 0) = -1 EACCES (Permission denied)

Filesystem is XFS, xattrs are supported properly.

If we modify /usr/lib/python2.7/site-packages/swift/obj/diskfile.py
to ignore o_tmpfile_supported(), and always use the legacy tempfile,
everything works as expected.

Version-Release number of selected component (if applicable):

glibc-2.17-157.el7_3.1.aarch64
glibc-headers-2.17-157.el7_3.1.aarch64
kernel-4.5.0-23.el7.aarch64
kernel-headers-4.5.0-23.el7.aarch64
python-swift-2.13.1-0.20170425180451.177fca2.el7.centos.noarch

How reproducible:

Synchronous.

Steps to Reproduce:
1. Install and start Swift
2. swift upload anycont anyobject

Actual results:

Traceback, object not uploaded

Expected results:

Object uploaded

Additional info:

O_TMPFILE on ARM can only be gotten from <asm/fcntl.h>. It's not yet
in <bits/fcntl-linux.h>. Values:

O_TMPFILE = 0x404000

On x86

O_TMPFILE = 0x410000

In either case O_DIRECTORY is included into O_TMPFILE.
Comment 1 Dan Radez 2017-05-16 13:06:47 UTC 
I have an ARM box that can be used for testing if needed.
Comment 2 Pete Zaitcev 2017-05-18 01:38:34 UTC 
Dan, could you swap your patch that kills o_tmpfile_supported() for
this one:

diff --git a/swift/obj/diskfile.py b/swift/obj/diskfile.py
index 769a954..499c26f 100644
--- a/swift/obj/diskfile.py
+++ b/swift/obj/diskfile.py
@@ -2448,6 +2448,8 @@ class BaseDiskFile(object):
                     fallback_to_mkstemp = True
                 else:
                     raise
+            # See https://bugzilla.redhat.com/show_bug.cgi?id=1451173
+            os.fchmod(fd, 0o640)
         if not self._use_linkat or fallback_to_mkstemp:
             if not exists(self._tmpdir):
                 mkdirs(self._tmpdir)

Please let me know if it worked.
Comment 3 Pete Zaitcev 2017-05-18 02:37:14 UTC 
Created attachment 1279857 [details]
xattr test

This needs Swift, so

mkdir -p xattr_perm_dir
rm -f xattr_perm_dir/yyy
PYTHONPATH=/q/zaitcev/hail/swift-tip strace -o xxx.py.strace -f python xattr_perm.py xattr_perm_dir
Comment 4 Pete Zaitcev 2017-05-18 02:58:15 UTC 
Actually, never mind. I know what's going on -- see bug 1330705.
Dan, please make sure you have glibc-2.17-160 or better on your ARM
and it should clear the problem. Don't forget to cancel any workarounds
that you had applied to Swift itself. Let me know how it goes.
Comment 5 Dan Radez 2017-05-18 14:55:22 UTC 
I don't see that version for arm, let me see if I can get it built and I'll be back in touch
Comment 6 Dan Radez 2017-05-18 15:18:45 UTC 
we may have to wait for RHEL 7.4
so CentOS can inherit the fix
doesn't look like it was fixed in z-stream
Comment 7 Pete Zaitcev 2017-05-19 21:05:34 UTC 
I'm retargeting this bug to the glibc component. Note that this bug
is tracking the situation with ARM. As soon as glibc-2.17-160 is
avialable for aarch64, this can be tested and closed. The bug 1330705
is for x86, so not a duplicate.
Comment 9 Florian Weimer 2017-05-20 07:25:07 UTC 

*** This bug has been marked as a duplicate of bug 1330705 ***
Comment 10 Florian Weimer 2017-05-20 07:28:16 UTC 
(In reply to Pete Zaitcev from comment #7)
> I'm retargeting this bug to the glibc component. Note that this bug
> is tracking the situation with ARM. As soon as glibc-2.17-160 is
> avialable for aarch64, this can be tested and closed. The bug 1330705
> is for x86, so not a duplicate.

That is not correct, the fix in bug 1330705 applies everywhere.
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