Hi, My server frooze this morning, and on the logs this error appeared: Aug 30 09:08:36 cache-machine kernel: BUG: unable to handle kernel paging request at ffff8a101da005a0 Aug 30 09:08:36 cache-machine kernel: IP: [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 30 09:08:36 cache-machine kernel: PGD 0 Aug 30 09:08:36 cache-machine kernel: Oops: 0000 [#19] SMP Aug 30 09:08:36 cache-machine kernel: last sysfs file: /sys/devices/platform/w83627ehf.2576/in8_max Aug 30 09:08:36 cache-machine kernel: CPU 7 Aug 30 09:08:36 cache-machine kernel: Modules linked in: Aug 30 09:08:36 cache-machine kernel: Aug 30 09:08:36 cache-machine kernel: Pid: 24819, comm: mysqld Tainted: G D 2.6.34.1 #1 MB-X58I-CH19/Thurley Aug 30 09:08:36 cache-machine kernel: RIP: 0010:[<ffffffff810b0460>] [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 30 09:08:36 cache-machine kernel: RSP: 0000:ffff8800c7637728 EFLAGS: 00010086 Aug 30 09:08:36 cache-machine kernel: RAX: 0000000000000000 RBX: 0000000000008010 RCX: 0000000000000010 Aug 30 09:08:36 cache-machine kernel: RDX: ffff8a101da005a0 RSI: 0000000000008010 RDI: ffff88021ecd9400 Aug 30 09:08:36 cache-machine kernel: RBP: ffff8800c7637748 R08: ffff880001bd8700 R09: 0000000000000002 Aug 30 09:08:36 cache-machine kernel: R10: 00000000000022c1 R11: 0000000000014466 R12: ffff88021ecd9400 Aug 30 09:08:36 cache-machine kernel: R13: 0000000000000246 R14: ffffffff811d24d4 R15: 0000000000000000 Aug 30 09:08:36 cache-machine kernel: FS: 00007f98072de950(0000) GS:ffff880001bc0000(0000) knlGS:0000000000000000 Aug 30 09:08:36 cache-machine kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 30 09:08:36 cache-machine kernel: CR2: ffff8a101da005a0 CR3: 000000021e79e000 CR4: 00000000000006e0 Aug 30 09:08:36 cache-machine kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Aug 30 09:08:36 cache-machine kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Aug 30 09:08:36 cache-machine kernel: Process mysqld (pid: 24819, threadinfo ffff8800c7636000, task ffff88021e477740) Aug 30 09:08:36 cache-machine kernel: Stack: Aug 30 09:08:36 cache-machine kernel: ffff88021f7b1000 ffff8800d2ae1cc0 ffff88021f7b1340 0000000000000000 Aug 30 09:08:36 cache-machine kernel: <0> ffff8800c76377b8 ffffffff811d24d4 ffff8800c7637778 0000000000000010 Aug 30 09:08:36 cache-machine kernel: <0> 0000001000008010 0000000000000003 ffff88021f7b1030 01ff880000000000 Aug 30 09:08:36 cache-machine kernel: Call Trace: Aug 30 09:08:36 cache-machine kernel: [<ffffffff811d24d4>] cfq_get_queue+0x10c/0x227 Aug 30 09:08:36 cache-machine kernel: [<ffffffff811d28d9>] cfq_set_request+0x26b/0x380 Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c4d8e>] elv_set_request+0x16/0x27 Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c8307>] get_request+0x24a/0x30b Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c83f5>] get_request_wait+0x2d/0x13a Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c87bb>] __make_request+0x2b9/0x3db Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c6e25>] generic_make_request+0x1bd/0x224 Aug 30 09:08:36 cache-machine kernel: [<ffffffff810d838e>] ? bio_alloc_bioset+0x73/0xbd Aug 30 09:08:36 cache-machine kernel: [<ffffffff811c6f4a>] submit_bio+0xbe/0xc7 Aug 30 09:08:36 cache-machine kernel: [<ffffffff810db0b3>] mpage_bio_submit+0x22/0x26 Aug 30 09:08:36 cache-machine kernel: [<ffffffff810dbb33>] do_mpage_readpage+0x3b1/0x4fb Aug 30 09:08:36 cache-machine kernel: [<ffffffff8108edaa>] ? ____pagevec_lru_add+0x12f/0x145 Aug 30 09:08:36 cache-machine kernel: [<ffffffff810dbdb1>] mpage_readpages+0xd7/0x11e Aug 30 09:08:36 cache-machine kernel: [<ffffffff8119c6e6>] ? xfs_get_blocks+0x0/0x14 Aug 30 09:08:36 cache-machine kernel: [<ffffffff8119c6e6>] ? xfs_get_blocks+0x0/0x14 Aug 30 09:08:36 cache-machine kernel: [<ffffffff8119d859>] xfs_vm_readpages+0x18/0x1a Aug 30 09:08:36 cache-machine kernel: [<ffffffff8108e296>] __do_page_cache_readahead+0x10c/0x1a2 Aug 30 09:08:36 cache-machine kernel: [<ffffffff8108e348>] ra_submit+0x1c/0x20 Aug 30 09:08:36 cache-machine kernel: [<ffffffff81087e46>] filemap_fault+0x1a4/0x327 Aug 30 09:08:36 cache-machine kernel: [<ffffffff81098fdf>] __do_fault+0x50/0x40b Aug 30 09:08:36 cache-machine kernel: [<ffffffff8109a4fe>] handle_mm_fault+0x3fa/0x7d0 Aug 30 09:08:36 cache-machine kernel: [<ffffffff810b49da>] ? do_sync_read+0xc6/0x103 Aug 30 09:08:36 cache-machine kernel: [<ffffffff8102004c>] do_page_fault+0x2d9/0x2fb Aug 30 09:08:36 cache-machine kernel: [<ffffffff810b558b>] ? vfs_read+0x137/0x16f Aug 30 09:08:36 cache-machine kernel: [<ffffffff8143b35f>] page_fault+0x1f/0x30 Aug 30 09:08:36 cache-machine kernel: Code: 00 00 49 8b 04 24 49 01 c0 49 8b 10 48 85 d2 75 15 83 ca ff 4c 89 f1 89 de 4c 89 e7 e8 77 f9 ff ff 48 89 c2 eb 0c 49 63 44 24 18 <48> 8b 04 02 49 89 00 41 55 9d 48 85 d2 74 11 66 85 db 79 0c 49 Aug 30 09:08:36 cache-machine kernel: RIP [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 30 09:08:36 cache-machine kernel: RSP <ffff8800c7637728> Aug 30 09:08:36 cache-machine kernel: CR2: ffff8a101da005a0 Aug 30 09:08:36 cache-machine kernel: ---[ end trace 5bbe659d1963f172 ]--- This has happened before (I posted it here a few weeks back), but I don't know how to fix it or even duplicate the bug... Looking back a few days, I noticed the first one appeared 2 days ago: Aug 28 23:49:02 cache-machine kernel: BUG: unable to handle kernel paging request at ffff8a101da005a0 Aug 28 23:49:02 cache-machine kernel: IP: [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 28 23:49:02 cache-machine kernel: PGD 0 Aug 28 23:49:02 cache-machine kernel: Oops: 0000 [#1] SMP Aug 28 23:49:02 cache-machine kernel: last sysfs file: /sys/devices/platform/w83627ehf.2576/in8_max Aug 28 23:49:02 cache-machine kernel: CPU 7 Aug 28 23:49:02 cache-machine kernel: Modules linked in: Aug 28 23:49:02 cache-machine kernel: Aug 28 23:49:02 cache-machine kernel: Pid: 20884, comm: sh Not tainted 2.6.34.1 #1 MB-X58I-CH19/Thurley Aug 28 23:49:02 cache-machine kernel: RIP: 0010:[<ffffffff810b0460>] [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 28 23:49:02 cache-machine kernel: RSP: 0000:ffff88016a209728 EFLAGS: 00010086 Aug 28 23:49:02 cache-machine kernel: RAX: 0000000000000000 RBX: 0000000000008010 RCX: 0000000000000010 Aug 28 23:49:02 cache-machine kernel: RDX: ffff8a101da005a0 RSI: 0000000000008010 RDI: ffff88021ecd9400 Aug 28 23:49:02 cache-machine kernel: RBP: ffff88016a209748 R08: ffff880001bd8700 R09: ffff88021f95f190 Aug 28 23:49:02 cache-machine kernel: R10: 0000000000000001 R11: 0000000000000001 R12: ffff88021ecd9400 Aug 28 23:49:02 cache-machine kernel: R13: 0000000000000246 R14: ffffffff811d24d4 R15: 0000000000000000 Aug 28 23:49:02 cache-machine kernel: FS: 00007f806013b6f0(0000) GS:ffff880001bc0000(0000) knlGS:0000000000000000 Aug 28 23:49:02 cache-machine kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Aug 28 23:49:02 cache-machine kernel: CR2: ffff8a101da005a0 CR3: 00000001f975c000 CR4: 00000000000006e0 Aug 28 23:49:02 cache-machine kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Aug 28 23:49:02 cache-machine kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Aug 28 23:49:02 cache-machine kernel: Process sh (pid: 20884, threadinfo ffff88016a208000, task ffff88021da15620) Aug 28 23:49:02 cache-machine kernel: Stack: Aug 28 23:49:02 cache-machine kernel: ffff88021f7b1000 ffff8801fce6fe80 ffff88021f7b1340 0000000000000000 Aug 28 23:49:02 cache-machine kernel: <0> ffff88016a2097b8 ffffffff811d24d4 ffff88016a209778 ffffffff00000010 Aug 28 23:49:02 cache-machine kernel: <0> 0000001000008010 0000000000000003 ffff88021f7b1030 01ffffff00000000 Aug 28 23:49:02 cache-machine kernel: Call Trace: Aug 28 23:49:02 cache-machine kernel: [<ffffffff811d24d4>] cfq_get_queue+0x10c/0x227 Aug 28 23:49:02 cache-machine kernel: [<ffffffff811d28d9>] cfq_set_request+0x26b/0x380 Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c4d8e>] elv_set_request+0x16/0x27 Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c8307>] get_request+0x24a/0x30b Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c83f5>] get_request_wait+0x2d/0x13a Aug 28 23:49:02 cache-machine kernel: [<ffffffff811d3f58>] ? cfq_merge+0x30/0x9f Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c548c>] ? elv_merge+0x166/0x19e Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c87bb>] __make_request+0x2b9/0x3db Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c6e25>] generic_make_request+0x1bd/0x224 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8119c627>] ? __xfs_get_blocks+0xb1/0x159 Aug 28 23:49:02 cache-machine kernel: [<ffffffff811c6f4a>] submit_bio+0xbe/0xc7 Aug 28 23:49:02 cache-machine kernel: [<ffffffff810db0b3>] mpage_bio_submit+0x22/0x26 Aug 28 23:49:02 cache-machine kernel: [<ffffffff810dbb33>] do_mpage_readpage+0x3b1/0x4fb Aug 28 23:49:02 cache-machine kernel: [<ffffffff81096a23>] ? __inc_zone_page_state+0x1e/0x20 Aug 28 23:49:02 cache-machine kernel: [<ffffffff810879e0>] ? add_to_page_cache_locked+0x75/0xb6 Aug 28 23:49:02 cache-machine kernel: [<ffffffff810dbdb1>] mpage_readpages+0xd7/0x11e Aug 28 23:49:02 cache-machine kernel: [<ffffffff8119c6e6>] ? xfs_get_blocks+0x0/0x14 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8119c6e6>] ? xfs_get_blocks+0x0/0x14 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8108c493>] ? get_page_from_freelist+0x3c1/0x483 Aug 28 23:49:02 cache-machine kernel: [<ffffffff81087807>] ? unlock_page+0x22/0x26 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8108c493>] ? get_page_from_freelist+0x3c1/0x483 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8119d859>] xfs_vm_readpages+0x18/0x1a Aug 28 23:49:02 cache-machine kernel: [<ffffffff8108e296>] __do_page_cache_readahead+0x10c/0x1a2 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8108e348>] ra_submit+0x1c/0x20 Aug 28 23:49:02 cache-machine kernel: [<ffffffff81087e46>] filemap_fault+0x1a4/0x327 Aug 28 23:49:02 cache-machine kernel: [<ffffffff81098fdf>] __do_fault+0x50/0x40b Aug 28 23:49:02 cache-machine kernel: [<ffffffff8109a4fe>] handle_mm_fault+0x3fa/0x7d0 Aug 28 23:49:02 cache-machine kernel: [<ffffffff8102004c>] do_page_fault+0x2d9/0x2fb Aug 28 23:49:02 cache-machine kernel: [<ffffffff810a027d>] ? do_brk+0x2d9/0x338 Aug 28 23:49:02 cache-machine kernel: [<ffffffff810c86a4>] ? alloc_fd+0x76/0x11e Aug 28 23:49:02 cache-machine kernel: [<ffffffff8143b35f>] page_fault+0x1f/0x30 Aug 28 23:49:02 cache-machine kernel: Code: 00 00 49 8b 04 24 49 01 c0 49 8b 10 48 85 d2 75 15 83 ca ff 4c 89 f1 89 de 4c 89 e7 e8 77 f9 ff ff 48 89 c2 eb 0c 49 63 44 24 18 <48> 8b 04 02 49 89 00 41 55 9d 48 85 d2 74 11 66 85 db 79 0c 49 Aug 28 23:49:02 cache-machine kernel: RIP [<ffffffff810b0460>] kmem_cache_alloc+0x5a/0x86 Aug 28 23:49:02 cache-machine kernel: RSP <ffff88016a209728> Aug 28 23:49:02 cache-machine kernel: CR2: ffff8a101da005a0 Aug 28 23:49:02 cache-machine kernel: ---[ end trace 5bbe659d1963f160 ]--- Is there any info I can provide you to help and fix it? Cheers, Felipe Damasio -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>