[LU-13296] statfs isn't work properly with MDT statfs proxy

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.14.0, Lustre 2.12.5
• Affects Version/s: Lustre 2.12.0, Lustre 2.12.5
• Severity: 3
• Assignee: Alexey Lyashkov
• Reporter: Alexey Lyashkov

Description

statfs don't work fine sometimes. It's easy replicate with start a several processes on same time which ask about block size.

all instances run on same node.

% aprun -n 8 ./a.out /lus/snx11242
statfs (/lus/snx11242) f_bsize 0X9003B000
statfs (/lus/snx11242) f_bsize 0X8C19F000
statfs (/lus/snx11242) f_bsize 0X82BFD000
statfs (/lus/snx11242) f_bsize 0X85C31000
statfs (/lus/snx11242) f_bsize 0X8BED2000
statfs (/lus/snx11242) f_bsize 0X835B1000
statfs (/lus/snx11242) f_bsize 0X828E3000
statfs (/lus/snx11242) f_bsize 0X1000

log for failed application.

00000080:00200000:0.0:1582645192.532388:0:16422:0:(llite_lib.c:1890:ll_statfs()) VFS Op: at 4296762105 jiffies
00000080:00000001:0.0:1582645192.532391:0:16422:0:(llite_lib.c:1838:ll_statfs_internal()) Process entered
00000080:00000001:0.0:1582645192.532392:0:16422:0:(obd_class.h:1051:obd_statfs()) Process entered
00000080:00000004:0.0:1582645192.532394:0:16422:0:(obd_class.h:1063:obd_statfs()) snx11242-clilmv-ffff881f8b680000: age 7262, max_age 7478
00000080:00000004:0.0:1582645192.535406:0:16422:0:(obd_class.h:1083:obd_statfs()) snx11242-clilmv-ffff881f8b680000: new ffff881f9cad8228 cache blocks 3366320026/3419988114 objects 630715697
0/6372092768
00000080:00000001:0.0:1582645192.535408:0:16422:0:(obd_class.h:1103:obd_statfs()) Process leaving (rc=0 : 0 : 0)
00000080:00000004:0.0:1582645192.535409:0:16422:0:(llite_lib.c:1848:ll_statfs_internal()) MDC blocks 18446744071580744875/18446744071582034486 objects 0/1
00000080:00000001:0.0:1582645192.535410:0:16422:0:(llite_lib.c:1851:ll_statfs_internal()) Process leaving via out (rc=0 : 0 : 0x0)
00000080:00000001:0.0:1582645192.535411:0:16422:0:(llite_lib.c:1881:ll_statfs_internal()) Process leaving (rc=0 : 0 : 0)

regression introduced by

commit b500d5193360711a6c6b07497f34e61cc590cf19
Author: Alex Zhuravlev <[e-mail]>
Date:   Thu Sep 21 18:24:18 2017 +0300

    LU-10018 protocol: MDT as a statfs proxy

Issue Links

• is duplicated by: LU-15361 lfs df output is incorrect
• is related to: LU-13285 multiple DF returns bad info
• is related to: LU-12368 concurrent statfs() calls on the client should be blocked