[LU-16056] rarely directories got created with the wrong permission

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.2
• Type: Bug
• Priority: Critical
• Reporter: Lai Siyao
• Assignee: Lai Siyao
• Resolution: Fixed
• Severity: 3

Description

we've had two instances of this, with the latest being:

[root@ec01 ~]# ls -ld /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.488.0/file.mdtest.488.30670
---------- 1 sihara users 0 Jul 16 10:10 /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.488.0/file.mdtest.488.30670

[root@ec01 ~]# lfs getdirstripe /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.488.0
lmv_stripe_count: 0 lmv_stripe_offset: 1 lmv_hash_type: none
[root@ec01 ~]# lfs getdirstripe -D /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.488.0
lmv_stripe_count: 1 lmv_stripe_offset: -1 lmv_hash_type: none lmv_max_inherit: -1 lmv_max_inherit_rr: 5
[root@ec01 ~]# lfs getstripe -m /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.488.0/file.mdtest.488.30670 
1 

The username/group ownership is fine, the permissions are supposed to be 755.

Comments

[Gerrit Updater]

"Lai Siyao <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/48071
Subject: LU-16056 mdt: debug patch for wrong dir permission
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 7291ac8308437f11fffb4ef7b2a7dded2c59c0fd

[Andreas Dilger]

Lai, I noticed a sanity test_103b failure on the Gerrit Janitor testing of an unrelated patch that might be the same as this issue:
https://testing.whamcloud.com/gerrit-janitor/24464/testresults/sanity2-ldiskfs-DNE-centos7_x86_64-centos7_x86_64-retry2/

== sanity test 103b: umask lfs setstripe ================= 18:43:45 (1659134625)
 sanity test_103b: @@@@@@ FAIL: lfs setstripe /mnt/lustre/f103b.sanity.s0074 '0000' != '0074' 
 sanity test_103b: @@@@@@ FAIL: lfs setstripe -N2 /mnt/lustre/f103b.sanity.m0061 '0000' != '0061' 

it looks like some kind of race condition/bug with umask handling, and has full debug logs on both the client and server, so this might be easier to investigate than the huge mdtest reproducer.

[Lai Siyao]

I checked the logs, but strangely didn't find any messages about these two files. And this test never failed in maloo test.

[Andreas Dilger]

If there isn't enough logging enabled for this test you could push a patch on master that modifies the test, in case it is hit again in the future? Maybe including your extra CDEBUG changes?

[Shuichi Ihara]

The latest patch worked and dumped when no permission file was created.

[root@ai400x2-1-vm1 ~]# lctl debug_file  /scratch/log/lustre-log.1659427201.8549 | grep '##'
00000004:00020000:19.0:1659427201.471371:0:8549:0:(mdt_handler.c:877:mdt_pack_attr2body()) ##### [0x200000483:0xfd91:0x0] with mode 32768 uid 8888 gid 100 valid 1100000080002f8f

[root@ec01 ~]# lfs fid2path /exafs "[0x200000483:0xfd91:0x0]"
/exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.162.0/file.mdtest.162.13744

[root@ec01 ~]# ls -l /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.162.0/file.mdtest.162.13744
---------- 1 sihara users 0 Aug  2 17:00 /exafs/home/sihara/mdtest.out/test-dir.0-0/mdtest_tree.162.0/file.mdtest.162.13744

[Gerrit Updater]

"Andreas Dilger <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/48233
Subject: LU-16056 libcfs: restore umask handling in kernel threads
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 06fe5984b7ebfe0153155546995576ea35f7ef21

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/48233/
Subject: LU-16056 libcfs: restore umask handling in kernel threads
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: c92bdd97d99cc755a187987f3d5963adeb3ea475

[Peter Jones]

Landed for 2.16

[Gerrit Updater]

"Jian Yu <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/48414
Subject: LU-16056 libcfs: restore umask handling in kernel threads
Project: fs/lustre-release
Branch: b2_15
Current Patch Set: 1
Commit: ac44a6c05afd67d9006c93132c354aef994c4383