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3.14.0-rc2: WARNING: at mm/slub.c:1007

To: LKML <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Subject: 3.14.0-rc2: WARNING: at mm/slub.c:1007
From: Christian Kujau <lists@xxxxxxxxxxxxxxx>
Date: Thu, 13 Feb 2014 11:53:05 -0800 (PST)
Cc: linux-mm@xxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Alpine 2.19.4 (DEB 40 2013-11-18)

after upgrading from 3.13-rc8 to 3.14.0-rc2 on this PowerPC G4 machine, 
the WARNING below was printed.

Shortly after, a lockdep warning appeared (possibly related to my 
post to the XFS list yesterday[0]).

Even later in the log an out-of-memory error appeared, that may or may not 
be relatd to that WARNING at all but which I'm trying to chase down ever 
since 3.13, but which tends to appear more often lately.

Can anyone take a look if this is something to worry about?

Full dmesg & .config: http://nerdbynature.de/bits/3.14-rc2/mm/


[0] http://oss.sgi.com/pipermail/xfs/2014-February/034054.html

 ------------[ cut here ]------------
 WARNING: at /usr/local/src/linux-git/mm/slub.c:1007
 Modules linked in: md5 ecb nfs i2c_powermac therm_adt746x ecryptfs arc4 
firewire_sbp2 b43 usb_storage mac80211 cfg80211
 CPU: 0 PID: 9025 Comm: nfsd Not tainted 3.14.0-rc2 #1
 task: efbf8000 ti: ed2a0000 task.ti: ed2a0000
 NIP: c00ccc28 LR: c00ccc20 CTR: 00000000
 REGS: ed2a1980 TRAP: 0700   Not tainted  (3.14.0-rc2)
 MSR: 00021032 <ME,IR,DR,RI>  CR: 22f82b82  XER: 20000000
 GPR00: c00ccc20 ed2a1a30 efbf8000 00000000 ef96e550 00000000 00000000 
 GPR08: 00000000 00000001 efbf86f8 000005e7 82fc2b88 00000000 00000001 
 GPR16: 00000000 00000000 c0760000 00000000 ef96e564 00100100 00200200 
 GPR24: 00000000 ef96e540 00000002 ef96fa80 00000000 00000000 ed2a0000 
 NIP [c00ccc28] deactivate_slab+0x4c0/0x538
 LR [c00ccc20] deactivate_slab+0x4b8/0x538
 Call Trace:
 [ed2a1a30] [c00ccc20] deactivate_slab+0x4b8/0x538 (unreliable)
 [ed2a1ae0] [c055d5f0] __slab_alloc.constprop.77+0x260/0x38c
 [ed2a1b50] [c00cd524] kmem_cache_alloc+0x118/0x140
 [ed2a1b70] [c01de4bc] kmem_zone_alloc+0x94/0x108
 [ed2a1ba0] [c01cccd4] xfs_inode_alloc+0x2c/0xd4
 [ed2a1bc0] [c01cd7a4] xfs_iget+0x2e4/0x584
 [ed2a1c30] [c020e664] xfs_lookup+0xc8/0xe4
 [ed2a1c70] [c01d3c28] xfs_vn_lookup+0x64/0xbc
 [ed2a1c90] [c00db3ac] lookup_real+0x30/0x70
 [ed2a1ca0] [c00dc384] __lookup_hash+0x3c/0x58
 [ed2a1cc0] [c00e1438] lookup_one_len+0x10c/0x15c
 [ed2a1ce0] [c01a170c] nfsd4_encode_dirent+0xb4/0x328
 [ed2a1d10] [c018f580] nfsd_readdir+0x1d4/0x288
 [ed2a1d90] [c019d648] nfsd4_encode_readdir+0x138/0x1f4
 [ed2a1dd0] [c01a1b18] nfsd4_encode_operation+0x8c/0xf0
 [ed2a1df0] [c019aa4c] nfsd4_proc_compound+0x1b8/0x4f8
 [ed2a1e30] [c0189d20] nfsd_dispatch+0x90/0x1a0
 [ed2a1e50] [c0536b04] svc_process+0x3d0/0x698
 [ed2a1e90] [c01895bc] nfsd+0xc0/0x120
 [ed2a1eb0] [c004f8fc] kthread+0xbc/0xd0
 [ed2a1f40] [c0010ae4] ret_from_kernel_thread+0x5c/0x64
 Instruction dump:
 7fe4fb78 800100b4 b9c10068 7d810120 7d808120 7c0803a6 382100b0 4bfffb00 
 80610048 4bf95dc5 2f830000 40beff4c <0fe00000> 4bffff44 815e000c 394a0001 
 ---[ end trace 1f5ed3ea8b3e4403 ]---

BOFH excuse #65:

system needs to be rebooted

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