Re: [S+Q3 20/23] slub: Shared cache to exploit cross cpu cachingabilities.
From: David Rientjes
Date: Tue Aug 17 2010 - 14:42:47 EST
On Tue, 17 Aug 2010, Christoph Lameter wrote:
> > This explodes on the memset() in slab_alloc() because of __GFP_ZERO on my
> > system:
>
> Well that seems to be because __kmalloc_node returned invalid address. Run
> with full debugging please?
>
Lots of data, so I trimmed it down to something reasonable by eliminating
reports that were very similar. (It also looks like some metadata is
getting displayed incorrectly such as negative pid's and 10-digit cpu
numbers.)
[ 14.152177] =============================================================================
[ 14.153172] BUG kmalloc-16: Object padding overwritten
[ 14.153172] -----------------------------------------------------------------------------
[ 14.153172]
[ 14.153172] INFO: 0xffff88107e595ea8-0xffff88107e595eab. First byte 0x0 instead of 0x5a
[ 14.153172] INFO: Freed in 0x7e00000000 age=18446743536838353798 cpu=0 pid=0
[ 14.153172] INFO: Slab 0xffffea0039ba3898 objects=51 new=4 fp=0x0007800000000000 flags=0xe00000000000080
[ 14.153172] INFO: Object 0xffff88107e595e60 @offset=3680
[ 14.153172]
[ 14.153172] Bytes b4 0xffff88107e595e50: 00 00 00 00 7e 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ....~...ZZZZZZZZ
[ 14.153172] Object 0xffff88107e595e60: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk
[ 14.153172] Redzone 0xffff88107e595e70: bb bb bb bb bb bb bb bb
[ 14.153172] Padding 0xffff88107e595ea8: 00 00 00 00 5a 5a 5a 5a ....ZZZZ
[ 14.153172] Pid: 1, comm: swapper Not tainted 2.6.35-slubq #1
[ 14.153172] Call Trace:
[ 14.153172] [<ffffffff81104333>] print_trailer+0x134/0x13f
[ 14.153172] [<ffffffff811043f5>] check_bytes_and_report+0xb7/0xe8
[ 14.153172] [<ffffffff8110455e>] check_object+0x138/0x150
[ 14.153172] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 14.153172] [<ffffffff811049bf>] alloc_debug_processing+0xd5/0x160
[ 14.153172] [<ffffffff811054d7>] slab_alloc+0x52e/0x590
[ 14.153172] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 14.153172] [<ffffffff811061fc>] __kmalloc_node+0x78/0xa3
[ 14.153172] [<ffffffff81106f18>] alloc_shared_caches+0x10f/0x277
[ 14.153172] [<ffffffff81b09661>] slab_sysfs_init+0x96/0x10a
[ 14.153172] [<ffffffff81b095cb>] ? slab_sysfs_init+0x0/0x10a
[ 14.153172] [<ffffffff810001f9>] do_one_initcall+0x5e/0x14e
[ 14.153172] [<ffffffff81aec6bb>] kernel_init+0x178/0x202
[ 14.153172] [<ffffffff81030954>] kernel_thread_helper+0x4/0x10
[ 14.153172] [<ffffffff81aec543>] ? kernel_init+0x0/0x202
[ 14.153172] [<ffffffff81030950>] ? kernel_thread_helper+0x0/0x10
[ 14.153172] FIX kmalloc-16: Restoring 0xffff88107e595ea8-0xffff88107e595eab=0x5a
...
[ 15.751474] =============================================================================
[ 15.752467] BUG kmalloc-16: Redzone overwritten
[ 15.752467] -----------------------------------------------------------------------------
[ 15.752467]
[ 15.752467] INFO: 0xffff880c7e5f3ec0-0xffff880c7e5f3ec7. First byte 0x30 instead of 0xbb
[ 15.752467] INFO: Allocated in 0xffff88087e4f11e0 age=131909211166235 cpu=2119111312 pid=-30712
[ 15.752467] INFO: Freed in 0xffff88087e4f13f0 age=131909211165707 cpu=2119111840 pid=-30712
[ 15.752467] INFO: Slab 0xffffea002bba4d28 objects=51 new=3 fp=0x0007000000000000 flags=0xa00000000000080
[ 15.752467] INFO: Object 0xffff880c7e5f3eb0 @offset=3760
[ 15.752467]
[ 15.752467] Bytes b4 0xffff880c7e5f3ea0: 18 00 00 00 7e 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ....~...ZZZZZZZZ
[ 15.752467] Object 0xffff880c7e5f3eb0: d0 0f 4f 7e 08 88 ff ff 80 10 4f 7e 08 88 ff ff .O~....O~..
[ 15.752467] Redzone 0xffff880c7e5f3ec0: 30 11 4f 7e 08 88 ff ff 0.O~..
[ 15.752467] Padding 0xffff880c7e5f3ef8: 00 16 4f 7e 08 88 ff ff ..O~..
[ 15.752467] Pid: 1, comm: swapper Not tainted 2.6.35-slubq #1
[ 15.752467] Call Trace:
[ 15.752467] [<ffffffff81104333>] print_trailer+0x134/0x13f
[ 15.752467] [<ffffffff811043f5>] check_bytes_and_report+0xb7/0xe8
[ 15.752467] [<ffffffff81104481>] check_object+0x5b/0x150
[ 15.752467] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff811049bf>] alloc_debug_processing+0xd5/0x160
[ 15.752467] [<ffffffff811054d7>] slab_alloc+0x52e/0x590
[ 15.752467] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff811061fc>] __kmalloc_node+0x78/0xa3
[ 15.752467] [<ffffffff81106f18>] alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff81b09661>] slab_sysfs_init+0x96/0x10a
[ 15.752467] [<ffffffff81b095cb>] ? slab_sysfs_init+0x0/0x10a
[ 15.752467] [<ffffffff810001f9>] do_one_initcall+0x5e/0x14e
[ 15.752467] [<ffffffff81aec6bb>] kernel_init+0x178/0x202
[ 15.752467] [<ffffffff81030954>] kernel_thread_helper+0x4/0x10
[ 15.752467] [<ffffffff81aec543>] ? kernel_init+0x0/0x202
[ 15.752467] [<ffffffff81030950>] ? kernel_thread_helper+0x0/0x10
[ 15.752467] FIX kmalloc-16: Restoring 0xffff880c7e5f3ec0-0xffff880c7e5f3ec7=0xbb
...
[ 15.752467] =============================================================================
[ 15.752467] BUG kmalloc-16: Pointer check fails
[ 15.752467] -----------------------------------------------------------------------------
[ 15.752467]
[ 15.752467] INFO: Allocated in 0xffff880c7e5f4080 age=131874850999735 cpu=2119539736 pid=-30704
[ 15.752467] INFO: Freed in 0xc00000000 age=18446743536838355610 cpu=4 pid=1
[ 15.752467] INFO: Slab 0xffffea002bba4d28 objects=51 new=0 fp=0x(null) flags=0xa00000000000080
[ 15.752467] INFO: Object 0xffff880c7e5f3ff0 @offset=4080
[ 15.752467]
[ 15.752467] Bytes b4 0xffff880c7e5f3fe0: 00 00 00 00 7e 00 00 00 00 00 00 00 5a 5a 5a 5a ....~.......ZZZZ
[ 15.752467] Object 0xffff880c7e5f3ff0: 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
[ 15.752467] Redzone 0xffff880c7e5f4000: 80 35 37 7e 04 88 ff ff .57~..
[ 15.752467] Padding 0xffff880c7e5f4038: 00 00 00 00 00 00 00 00 ........
[ 15.752467] Pid: 1, comm: swapper Not tainted 2.6.35-slubq #1
[ 15.752467] Call Trace:
[ 15.752467] [<ffffffff81104333>] print_trailer+0x134/0x13f
[ 15.752467] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff81104858>] object_err+0x3a/0x43
[ 15.752467] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff811049ad>] alloc_debug_processing+0xc3/0x160
[ 15.752467] [<ffffffff811054d7>] slab_alloc+0x52e/0x590
[ 15.752467] [<ffffffff81106f18>] ? alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff811061fc>] __kmalloc_node+0x78/0xa3
[ 15.752467] [<ffffffff81106f18>] alloc_shared_caches+0x10f/0x277
[ 15.752467] [<ffffffff81b09661>] slab_sysfs_init+0x96/0x10a
[ 15.752467] [<ffffffff81b095cb>] ? slab_sysfs_init+0x0/0x10a
[ 15.752467] [<ffffffff810001f9>] do_one_initcall+0x5e/0x14e
[ 15.752467] [<ffffffff81aec6bb>] kernel_init+0x178/0x202
[ 15.752467] [<ffffffff81030954>] kernel_thread_helper+0x4/0x10
[ 15.752467] [<ffffffff81aec543>] ? kernel_init+0x0/0x202
[ 15.752467] [<ffffffff81030950>] ? kernel_thread_helper+0x0/0x10
[ 15.752467] FIX kmalloc-16: Marking all objects used
--
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