linux-kernel - 4.11.0-rc1 boot resulted in WARNING: CPU: 14 PID: 1722 at fs/sysfs/dir.c:31 .sysfs_warn

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Message-Id: <1488904264.3961.17.camel@abdul-ThinkPad-T450>
Date:   Tue, 07 Mar 2017 22:01:04 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc:     mpe@...erman.id, linux-kernel <linux-kernel@...r.kernel.org>,
        linux-xfs@...r.kernel.org, mpe <mpe@...erman.id>
Subject: 4.11.0-rc1 boot resulted in WARNING: CPU: 14 PID: 1722 at
 fs/sysfs/dir.c:31 .sysfs_warn_dup+0x78/0xb0


Hi,

Today's mainline (4.11.0-rc1) booted with warnings on Power7 LPAR.

Issue is not reproducible all the time.

traces:
--------
Found device VDASD 5.
Mounting /home...
Reached target Swap.
Found device VDASD 2.

Mounting /boot...

sysfs: cannot create duplicate filename '/fs/xfs/sda'
------------[ cut here ]------------
WARNING: CPU: 14 PID: 1722 at fs/sysfs/dir.c:31 .sysfs_warn_dup
+0x78/0xb0
Modules linked in: sg(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E)
grace(E) sunrpc(E) binfmt_misc(E) ip_tables(E) ext4(E) mbcache(E)
jbd2(E) sd_mod(E) ibmvscsi(E) ibmveth(E) scsi_transport_srp(E)
CPU: 14 PID: 1722 Comm: mount Tainted: G        W   E   4.11.0-rc1-autotest #1
task: c0000009ed3f9c80 task.stack: c0000009ed430000
NIP: c0000000003a6c68 LR: c0000000003a6c64 CTR: 0000000001764c5c
REGS: c0000009ed4333c0 TRAP: 0700   Tainted: G        W   E    (4.11.0-rc1-autotest)
MSR: 800000000282b032 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI>
  CR: 22022822  XER: 00000006
CFAR: c000000000994958 SOFTE: 1
GPR00: c0000000003a6c64 c0000009ed433640 c00000000138a500 0000000000000035
GPR04: c0000009ff88ada0 c0000009ff8a1658 00000000014cfc2c 0000000000000000
GPR08: 0000000000000000 c000000000dd146c 00000009feac0000 0000000000003fef
GPR12: 0000000022022844 c00000000e9f7e00 0000000037409c40 0000000037409c30
GPR16: 0000000037409c28 ffffffffffffffff 0000000000000000 000000003741f1c8
GPR20: 00000100147d1270 0000000000000000 00000000c0ed0000 00003fffa0f53384
GPR24: c00000000394d178 c000000000c054c0 c000000001742e68 c0000000ff3ea640
GPR28: c00000000394d640 c0000013eec28c28 c0000009f2ab0148 c000000003833000
NIP [c0000000003a6c68] .sysfs_warn_dup+0x78/0xb0
LR [c0000000003a6c64] .sysfs_warn_dup+0x74/0xb0
Call Trace:
[c0000009ed433640] [c0000000003a6c64] .sysfs_warn_dup+0x74/0xb0 (unreliable)
[c0000009ed4336d0] [c0000000003a6de4] .sysfs_create_dir_ns+0xc4/0xd0
[c0000009ed433760] [c000000000551048] .kobject_add_internal+0xd8/0x450
[c0000009ed433800] [c00000000055141c] .kobject_init_and_add+0x5c/0x90
[c0000009ed433890] [c00000000044ac54] .xfs_mountfs+0x224/0xa30
[c0000009ed433960] [c000000000452a90] .xfs_fs_fill_super+0x490/0x620
[c0000009ed433a10] [c0000000002fefc0] .mount_bdev+0x220/0x260
[c0000009ed433ac0] [c0000000004509b8] .xfs_fs_mount+0x18/0x30
[c0000009ed433b30] [c000000000300520] .mount_fs+0x70/0x210
[c0000009ed433bf0] [c000000000325930] .vfs_kern_mount+0x60/0x1c0
[c0000009ed433cb0] [c00000000032a458] .do_mount+0x268/0xee0
[c0000009ed433d90] [c00000000032b4ec] .SyS_mount+0x8c/0x100
[c0000009ed433e30] [c00000000000b184] system_call+0x38/0xe0
Instruction dump:
7fa3eb78 38800000 7fe5fb78 38c01000 4bffa929 60000000 3c62ff8b 7fe4fb78
38636ec8 7fc5f378 485edcb9 60000000 <0fe00000> 7fe3fb78 4bf1fb01 60000000
---[ end trace 78f08bafbc2388f3 ]---
kobject_add_internal failed for sda with -EEXIST, don't try to register
things with the same name in the same directory.


-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre