On Tue, 5 May 2015 10:14:18 +0200 Alexander Lyakas <alex.bolshoy@xxxxxxxxx> wrote: > Hi Neil, > we had the following crash: > > [86399.862150] general protection fault: 0000 [#1] SMP > [86399.881970] CPU 1 > [86399.882264] Pid: 17989, comm: md4_raid6 Tainted: GF W O > 3.8.13-030813-generic #201305111843 Bochs Bochs > [86399.883681] RIP: 0010:[<ffffffff8135d446>] [<ffffffff8135d446>] > memcpy+0x6/0x110 > [86399.884886] RSP: 0018:ffff8800a78e5a80 EFLAGS: 00010286 > [86399.885629] RAX: 4588966d912cea06 RBX: ffff8800a78e4000 RCX: 0000000000001000 > [86399.886605] RDX: 0000000000001000 RSI: ffff8800a7ed2000 RDI: 4588966d912cea06 > [86399.887586] RBP: ffff8800a78e5ae8 R08: 0000000000001000 R09: ffff8800a78e5b20 > [86399.888603] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > [86399.889593] R13: ffff8800a78e5b20 R14: 0000000000001000 R15: 0000000000000000 > [86399.890551] FS: 0000000000000000(0000) GS:ffff88011fd00000(0000) > knlGS:0000000000000000 > [86399.891648] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [86399.892504] CR2: 00007f10cb8ae966 CR3: 0000000113bfc000 CR4: 00000000001406e0 > [86399.893493] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [86399.894458] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > [86399.895426] Process md4_raid6 (pid: 17989, threadinfo > ffff8800a78e4000, task ffff8800a7dc0000) > [86399.896629] Stack: > [86399.896930] ffffffffa05061c5 ffff88000ab6fa06 ffffffff816ed725 > ffffea00029fb480 > [86399.898005] 51160e39b619d7e4 0000000000000000 000000000ab6fa06 > ffff8800c696b938 > [86399.899082] 000000003eca7624 ffff880084dc1ac0 0000000000001000 > 0000000000000002 > [86399.900293] Call Trace: > [86399.900660] [<ffffffffa05061c5>] ? async_memcpy+0x1c5/0x1000 [async_memcpy] > [86399.901653] [<ffffffff816ed725>] ? _raw_spin_lock_irq+0x15/0x20 > [86399.902655] [<ffffffffa05a5090>] async_copy_data+0x100/0x140 [raid456] > [86399.903557] [<ffffffffa05abe20>] handle_stripe+0x13e0/0x2380 [raid456] > [86399.904531] [<ffffffff815739de>] ? dm_dispatch_request+0x3e/0x70 > [86399.905388] [<ffffffff81097c33>] ? update_curr+0x143/0x1f0 > [86399.906151] [<ffffffff816eb03d>] ? mutex_lock+0x1d/0x50 > [86399.906888] [<ffffffffa05adea5>] handle_active_stripes+0x165/0x200 [raid456] > [86399.907857] [<ffffffff8156ab8e>] ? md_check_recovery.part.49+0x3e/0x530 > [86399.908811] [<ffffffffa05ae28a>] raid5d+0x34a/0x570 [raid456] > [86399.909614] [<ffffffff8156344d>] md_thread+0x10d/0x140 > [86399.910356] [<ffffffff8107fc10>] ? add_wait_queue+0x60/0x60 > [86399.911149] [<ffffffff81563340>] ? md_rdev_init+0x140/0x140 > [86399.911955] [<ffffffff8107f050>] kthread+0xc0/0xd0 > [86399.912668] [<ffffffff8107ef90>] ? flush_kthread_worker+0xb0/0xb0 > [86399.913528] [<ffffffff816f61ec>] ret_from_fork+0x7c/0xb0 > [86399.914267] [<ffffffff8107ef90>] ? flush_kthread_worker+0xb0/0xb0 > [86399.915109] Code: 74 13 48 8b 43 58 48 2b 43 50 88 43 4e 48 83 c4 > 08 5b 5d c3 90 e8 fb fd ff ff eb e6 90 90 90 90 90 90 90 90 90 48 89 > f8 48 89 d1 <f3> a4 c3 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 20 4c 8b 06 > 4c 8b > [86399.919028] RIP [<ffffffff8135d446>] memcpy+0x6/0x110 > > Can you maybe advise what is happening here? Our kernel is 3.8.13. > Not really. It appears that %RDI is the destination for the memcpy, and it contains a garbage address. I cannot easily tell if this is a read or a write, but I'd guess a read as it is hard to get the address of the page in the stripe_cache wrong. Maybe something has corrupted the bio?? NeilBrown
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