Greetings, Here is a one-shot linux-next oops which seems rather hard to reproduce. bisect is on the way, however will take quite long time.. [ 43.530577] work still pending [ 43.530897] ------------[ cut here ]------------ [ 43.530900] kernel BUG at /c/kernel-tests/src/linux/block/blk-core.c:2126! [ 43.530908] invalid opcode: 0000 [#1] SMP [ 43.530926] Pid: 79, comm: kworker/u:2 Not tainted 3.7.0-rc2-next-20121026 #18 Bochs Bochs [ 43.530928] EIP: 0060:[] EFLAGS: 00010086 CPU: 0 [ 43.530950] EIP is at blk_dequeue_request+0x11/0x4a [ 43.530951] EAX: c79f4000 EBX: c79f4000 ECX: c79f4000 EDX: 00000000 [ 43.530952] ESI: c197eea0 EDI: 00000001 EBP: cf8f3f00 ESP: cf8f3ef8 [ 43.530953] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 [ 43.530954] CR0: 8005003b CR2: 00000000 CR3: 01a3e000 CR4: 000006d0 [ 43.530962] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 43.530965] DR6: ffff0ff0 DR7: 00000400 [ 43.530967] Process kworker/u:2 (pid: 79, ti=cf8f2000 task=c7b960a0 task.ti=cf8f2000) [ 43.530967] Stack: [ 43.530970] c1279767 c79f4000 cf8f3f0c c1279eda 00000000 cf8f3f18 c146db80 cf8ecc80 [ 43.530973] cf8f3f44 c103e5e3 cf8f3f28 c146db10 c1a6970c cd921200 00000000 c1a69600 [ 43.530976] cf8ecc80 c1a6970c cf8ecc90 cf8f3f68 c103e90c c7b960a0 cf8ecc90 cd857ebc [ 43.530976] Call Trace: [ 43.531028] [] ? blk_start_request+0xb/0x31 [ 43.531029] [] blk_fetch_request+0x14/0x19 [ 43.531043] [] redo_fd_request+0x70/0x27e [ 43.531054] [] process_one_work+0x130/0x1f4 [ 43.531056] [] ? request_done+0x13e/0x13e [ 43.531058] [] worker_thread+0xfa/0x188 [ 43.531061] [] ? rescuer_thread+0x14a/0x14a [ 43.531066] [] kthread+0x6e/0x73 [ 43.531078] [] ret_from_kernel_thread+0x1b/0x28 [ 43.531082] [] ? __kthread_parkme+0x54/0x54 [ 43.531099] Code: eb 0c 03 51 20 8b 49 08 85 c9 75 e5 eb ec 85 d2 75 02 0f 0b 5b 89 d0 5e 5d c3 8b 10 8b 48 1c 39 c2 75 02 0f 0b 83 78 48 00 74 02 <0f> 0b 55 89 e5 53 8b 58 04 89 5a 04 89 13 8b 50 20 89 00 89 40 [ 43.531104] EIP: [] blk_dequeue_request+0x11/0x4a SS:ESP 0068:cf8f3ef8 Thanks, Fengguang