Date:	Fri, 17 Aug 2007 22:17:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	clameter@....com
CC:	linux-kernel@...r.kernel.org
Subject: SLUB bug on sparc64


Hi Christoph,

When I force SLUB debugging on sparc64, it barfs on early bootup while
making the sysfs nodes.  Removing the BUG()'s on the sysfs error
returns, and adding some tracing I captured the log below.

BTW, I would recommending removing the BUG() calls, they serve only to
force someone hitting them to edit them out and reboot which is
absolutely pointless :-) This code can also often run before the
console is first enabled, making analysis of the error return that
much harder if it BUG()'s instead of trying to continue.

The problem seems to be that both tsb_512KB and tsb_1MB are
unmergeable, and so are the kmalloc caches of those sizes.  But the
"unique name" created for the aliases are identical, always ":%d"
where %d is the cache size, so the kobject_add() fails the second
time around.

[16529.414107] sysfs_slab_add: name[shmem_inode_cache] size[800] unmergeable[1]
[16529.414958] sysfs_slab_add: name[nsproxy] size[120] unmergeable[1]
[16529.415683] sysfs_slab_add: name[posix_timers_cache] size[232] unmergeable[1]
[16529.416459] sysfs_slab_add: name[uid_cache] size[160] unmergeable[1]
[16529.417180] sysfs_slab_add: name[ip_mrt_cache] size[192] unmergeable[1]
[16529.417952] sysfs_slab_add: name[UDP-Lite] size[800] unmergeable[1]
[16529.418674] sysfs_slab_add: name[tcp_bind_bucket] size[128] unmergeable[1]
[16529.419402] sysfs_slab_add: name[inet_peer_cache] size[160] unmergeable[1]
[16529.420179] sysfs_slab_add: name[secpath_cache] size[128] unmergeable[1]
[16529.420913] sysfs_slab_add: name[xfrm_dst_cache] size[416] unmergeable[1]
[16529.421689] sysfs_slab_add: name[ip_fib_alias] size[128] unmergeable[1]
[16529.422417] sysfs_slab_add: name[ip_fib_hash] size[128] unmergeable[1]
[16529.423194] sysfs_slab_add: name[ip_dst_cache] size[384] unmergeable[1]
[16529.423930] sysfs_slab_add: name[arp_cache] size[288] unmergeable[1]
[16529.424723] sysfs_slab_add: name[RAW] size[800] unmergeable[1]
[16529.425445] sysfs_slab_add: name[UDP] size[800] unmergeable[1]
[16529.426234] sysfs_slab_add: name[tw_sock_TCP] size[224] unmergeable[1]
[16529.426968] sysfs_slab_add: name[request_sock_TCP] size[160] unmergeable[1]
[16529.427745] sysfs_slab_add: name[TCP] size[1568] unmergeable[1]
[16529.428467] sysfs_slab_add: name[eventpoll_pwq] size[144] unmergeable[1]
[16529.429244] sysfs_slab_add: name[eventpoll_epi] size[224] unmergeable[1]
[16529.429977] sysfs_slab_add: name[sgpool-128] size[3168] unmergeable[1]
[16529.430753] sysfs_slab_add: name[sgpool-64] size[1632] unmergeable[1]
[16529.431495] sysfs_slab_add: name[sgpool-32] size[864] unmergeable[1]
[16529.432223] sysfs_slab_add: name[sgpool-16] size[480] unmergeable[1]
[16529.432995] sysfs_slab_add: name[sgpool-8] size[288] unmergeable[1]
[16529.433722] sysfs_slab_add: name[scsi_io_context] size[184] unmergeable[1]
[16529.434528] sysfs_slab_add: name[blkdev_ioc] size[136] unmergeable[1]
[16529.435254] sysfs_slab_add: name[blkdev_queue] size[1624] unmergeable[1]
[16529.436028] sysfs_slab_add: name[blkdev_requests] size[360] unmergeable[1]
[16529.436760] sysfs_slab_add: name[biovec-256] size[4192] unmergeable[1]
[16529.437538] sysfs_slab_add: name[biovec-128] size[2144] unmergeable[1]
[16529.438270] sysfs_slab_add: name[biovec-64] size[1120] unmergeable[1]
[16529.439041] sysfs_slab_add: name[biovec-16] size[352] unmergeable[1]
[16529.439768] sysfs_slab_add: name[biovec-4] size[160] unmergeable[1]
[16529.440540] sysfs_slab_add: name[biovec-1] size[88] unmergeable[1]
[16529.441266] sysfs_slab_add: name[bio] size[192] unmergeable[1]
[16529.442035] sysfs_slab_add: name[sock_inode_cache] size[704] unmergeable[1]
[16529.442901] sysfs_slab_add: name[skbuff_fclone_cache] size[480] unmergeable[1]
[16529.443710] sysfs_slab_add: name[skbuff_head_cache] size[288] unmergeable[1]
[16529.444465] sysfs_slab_add: name[file_lock_cache] size[248] unmergeable[1]
[16529.445197] sysfs_slab_add: name[proc_inode_cache] size[640] unmergeable[1]
[16529.445993] sysfs_slab_add: name[sigqueue] size[232] unmergeable[1]
[16529.446730] sysfs_slab_add: name[radix_tree_node] size[624] unmergeable[1]
[16529.447515] sysfs_slab_add: name[bdev_cache] size[832] unmergeable[1]
[16529.448250] sysfs_slab_add: name[sysfs_dir_cache] size[160] unmergeable[1]
[16529.449103] sysfs_slab_add: name[mnt_cache] size[288] unmergeable[1]
[16529.449836] sysfs_slab_add: name[inode_cache] size[608] unmergeable[1]
[16529.450616] sysfs_slab_add: name[dentry] size[280] unmergeable[1]
[16529.451347] sysfs_slab_add: name[filp] size[288] unmergeable[1]
[16529.452127] sysfs_slab_add: name[names_cache] size[4192] unmergeable[1]
[16529.452890] sysfs_slab_add: name[key_jar] size[224] unmergeable[1]
[16529.453670] sysfs_slab_add: name[idr_layer_cache] size[600] unmergeable[1]
[16529.454515] sysfs_slab_add: name[buffer_head] size[176] unmergeable[1]
[16529.455293] sysfs_slab_add: name[mm_struct] size[1056] unmergeable[1]
[16529.456028] sysfs_slab_add: name[vm_area_struct] size[240] unmergeable[1]
[16529.456807] sysfs_slab_add: name[fs_cache] size[160] unmergeable[1]
[16529.457542] sysfs_slab_add: name[files_cache] size[800] unmergeable[1]
[16529.458280] sysfs_slab_add: name[signal_cache] size[800] unmergeable[1]
[16529.459064] sysfs_slab_add: name[sighand_cache] size[2688] unmergeable[1]
[16529.459831] sysfs_slab_add: name[task_struct] size[1376] unmergeable[1]
[16529.460615] sysfs_slab_add: name[anon_vma] size[96] unmergeable[1]
[16529.461346] sysfs_slab_add: name[tsb_1MB] size[1048576] unmergeable[0]
[16529.462161] sysfs_slab_alias: name[tsb_1MB] size[1048576]
[16529.462212] sysfs_slab_add: name[tsb_512KB] size[524288] unmergeable[0]
[16529.462969] sysfs_slab_alias: name[tsb_512KB] size[524288]
[16529.463020] sysfs_slab_add: name[tsb_256KB] size[524288] unmergeable[1]
[16529.463796] sysfs_slab_add: name[tsb_128KB] size[262144] unmergeable[1]
[16529.464573] sysfs_slab_add: name[tsb_64KB] size[131072] unmergeable[1]
[16529.465354] sysfs_slab_add: name[tsb_32KB] size[65536] unmergeable[1]
[16529.466107] sysfs_slab_add: name[tsb_16KB] size[32768] unmergeable[1]
[16529.466888] sysfs_slab_add: name[tsb_8KB] size[16384] unmergeable[1]
[16529.467627] sysfs_slab_add: name[pid] size[136] unmergeable[1]
[16529.468407] sysfs_slab_add: name[kmalloc-8388608] size[8388608] unmergeable[0]
[16529.469144] sysfs_slab_alias: name[kmalloc-8388608] size[8388608]
[16529.469197] sysfs_slab_add: name[kmalloc-4194304] size[4194304] unmergeable[0]
[16529.469976] sysfs_slab_alias: name[kmalloc-4194304] size[4194304]
[16529.470031] sysfs_slab_add: name[kmalloc-2097152] size[2097152] unmergeable[0]
[16529.470764] sysfs_slab_alias: name[kmalloc-2097152] size[2097152]
[16529.470819] sysfs_slab_add: name[kmalloc-1048576] size[1048576] unmergeable[0]
[16529.470876] kobject_add failed for :1048576 with -EEXIST, don't try to register things with the same name in the same directory.
[16529.470907] Call Trace:
[16529.470921]  [00000000004bcf24] sysfs_slab_add+0x168/0x1bc
[16529.470955]  [00000000008313f4] slab_sysfs_init+0x58/0xb8
[16529.470986]  [0000000000820370] kernel_init+0x22c/0x3ac
[16529.471016]  [0000000000427844] kernel_thread+0x38/0x48
[16529.471039]  [00000000006cf278] rest_init+0x18/0x60
[16529.471062] sysfs_slab_add: name[kmalloc-524288] size[524288] unmergeable[0]
[16529.471113] kobject_add failed for :0524288 with -EEXIST, don't try to register things with the same name in the same directory.
[16529.471142] Call Trace:
[16529.471155]  [00000000004bcf24] sysfs_slab_add+0x168/0x1bc
[16529.471180]  [00000000008313f4] slab_sysfs_init+0x58/0xb8
[16529.471204]  [0000000000820370] kernel_init+0x22c/0x3ac
[16529.471227]  [0000000000427844] kernel_thread+0x38/0x48
[16529.471248]  [00000000006cf278] rest_init+0x18/0x60
[16529.471271] sysfs_slab_add: name[kmalloc-262144] size[262216] unmergeable[1]
[16529.472052] sysfs_slab_add: name[kmalloc-131072] size[131144] unmergeable[1]
[16529.472794] sysfs_slab_add: name[kmalloc-65536] size[65608] unmergeable[1]
[16529.473584] sysfs_slab_add: name[kmalloc-32768] size[32840] unmergeable[1]
[16529.474913] sysfs_slab_add: name[kmalloc-16384] size[16456] unmergeable[1]
[16529.475648] sysfs_slab_add: name[kmalloc-8192] size[8264] unmergeable[1]
[16529.476431] sysfs_slab_add: name[kmalloc-4096] size[4168] unmergeable[1]
[16529.477168] sysfs_slab_add: name[kmalloc-2048] size[2120] unmergeable[1]
[16529.477952] sysfs_slab_add: name[kmalloc-1024] size[1096] unmergeable[1]
[16529.478689] sysfs_slab_add: name[kmalloc-512] size[584] unmergeable[1]
[16529.479473] sysfs_slab_add: name[kmalloc-256] size[328] unmergeable[1]
[16529.480211] sysfs_slab_add: name[kmalloc-128] size[200] unmergeable[1]
[16529.480995] sysfs_slab_add: name[kmalloc-64] size[136] unmergeable[1]
[16529.481731] sysfs_slab_add: name[kmalloc-32] size[104] unmergeable[1]
[16529.482527] sysfs_slab_add: name[kmalloc-16] size[88] unmergeable[1]
[16529.483273] sysfs_slab_add: name[kmalloc-8] size[80] unmergeable[1]
[16529.484058] sysfs_slab_add: name[kmalloc-192] size[264] unmergeable[1]
[16529.484830] sysfs_slab_add: name[kmalloc-96] size[168] unmergeable[1]
[16529.485654] sysfs_slab_add: name[fasync_cache] size[96] unmergeable[1]
[16529.486426] sysfs_slab_add: name[kiocb] size[320] unmergeable[1]
[16529.487242] sysfs_slab_add: name[kioctx] size[384] unmergeable[1]
[16529.496786] sysfs_slab_add: name[inotify_watch_cache] size[144] unmergeable[1]
[16529.497582] sysfs_slab_add: name[inotify_event_cache] size[112] unmergeable[1]
[16529.498530] sysfs_slab_add: name[dnotify_cache] size[112] unmergeable[1]
[16529.499424] sysfs_slab_add: name[ext3_xattr] size[160] unmergeable[1]
[16529.500238] sysfs_slab_add: name[ext3_inode_cache] size[808] unmergeable[1]
[16529.501040] sysfs_slab_add: name[revoke_record] size[128] unmergeable[1]
[16529.501861] sysfs_slab_add: name[revoke_table] size[88] unmergeable[1]
[16529.502638] sysfs_slab_add: name[journal_head] size[168] unmergeable[1]
[16529.503459] sysfs_slab_add: name[journal_handle] size[96] unmergeable[1]
[16529.504315] sysfs_slab_add: name[ext2_xattr] size[160] unmergeable[1]
[16529.505127] sysfs_slab_add: name[ext2_inode_cache] size[768] unmergeable[1]
[16529.505904] sysfs_slab_add: name[hugetlbfs_inode_cache] size[608] unmergeable[1]
[16529.506902] sysfs_slab_add: name[mqueue_inode_cache] size[896] unmergeable[1]
[16529.507830] sysfs_slab_add: name[bsg_cmd] size[384] unmergeable[1]

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