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Date: Tue, 17 Aug 2010 11:42:25 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Christoph Lameter <cl@...ux-foundation.org> cc: Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Nick Piggin <npiggin@...e.de> Subject: Re: [S+Q3 20/23] slub: Shared cache to exploit cross cpu caching abilities. 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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