【OFED bug confirm】

oulijun
2017-11-08T03:20:06Z

Hi, everyone
I am test CM based kernel-4.14-rc5 and met a bug.
I analyse that it maybe is a ib core bug. hence, I find a patch and this patch is not exist in kernel-4.14-rc5
IB/CM: fix memory corruption by avoiding unnecessary memset

the calltrace print as follows:
[ 784.353974] ------------[ cut here ]------------
[ 784.361184] WARNING: CPU: 0 PID: 25 at ./include/rdma/ib_verbs.h:3799 cm_req_handler+0xcd8/0xd18 [ib_cm]
[ 784.371032] Modules linked in: hns_roce_hw_v2 hns_roce rdma_ucm rdma_cm iw_cm ib_uverbs ib_cm ib_core
[ 784.382150] CPU: 0 PID: 25 Comm: kworker/0:1 Not tainted 4.14.0-rc5-g25886d7-dirty #34
[ 784.391263] Workqueue: ib_cm cm_work_handler [ib_cm]
[ 784.396734] task: ffff80003d969c00 task.stack: ffff000009308000
[ 784.403499] PC is at cm_req_handler+0xcd8/0xd18 [ib_cm]
[ 784.409439] LR is at cm_req_handler+0x32c/0xd18 [ib_cm]
[ 784.415022] pc : [<ffff000000a28b88>] lr : [<ffff000000a281dc>] pstate: 00c00149
[ 784.422704] sp : ffff00000930bca0
[ 784.426308] x29: ffff00000930bca0 x28: ffff80003d982100
[ 784.432184] x27: ffff8000081f98b0 x26: ffff8000081f98c8
[ 784.438014] x25: ffff80003d8ce400 x24: ffff800007f6a6e8
[ 784.443830] x23: 0000000000000000 x22: ffff000000a2b600
[ 784.449641] x21: ffff8000081f9600 x20: ffff800007f6a6e8
[ 784.455435] x19: ffff8000081f9800 x18: 0000000000000001
[ 784.461244] x17: 0000000000000000 x16: ffff000008b56c30
[ 784.467024] x15: 0000000000000000 x14: 0000004000000000
[ 784.472835] x13: ffff00000903ef80 x12: ffffffffffffffff
[ 784.478634] x11: 0000000000000040 x10: 0000000000000a00
[ 784.484469] x9 : 0000000000000000 x8 : ffff8000081f9c00
[ 784.490262] x7 : 0000000000000000 x6 : 0000000000123456
[ 784.496061] x5 : ffff80003d8ce400 x4 : 5348060100000000
[ 784.501842] x3 : ffff800007f6a668 x2 : 0000000000000000
[ 784.507638] x1 : 00000000665f736e x0 : 00000000665f736e
[ 784.513489] Call trace:
[ 784.516363] Exception stack(0xffff00000930bb60 to 0xffff00000930bca0)
[ 784.523257] bb60: 00000000665f736e 00000000665f736e 0000000000000000 ffff800007f6a668
[ 784.531488] bb80: 5348060100000000 ffff80003d8ce400 0000000000123456 0000000000000000
[ 784.539718] bba0: ffff8000081f9c00 0000000000000000 0000000000000a00 0000000000000040
[ 784.547934] bbc0: ffffffffffffffff ffff00000903ef80 0000004000000000 0000000000000000
[ 784.556124] bbe0: ffff000008b56c30 0000000000000000 0000000000000001 ffff8000081f9800
[ 784.564343] bc00: ffff800007f6a6e8 ffff8000081f9600 ffff000000a2b600 0000000000000000
[ 784.572548] bc20: ffff800007f6a6e8 ffff80003d8ce400 ffff8000081f98c8 ffff8000081f98b0
[ 784.580749] bc40: ffff80003d982100 ffff00000930bca0 ffff000000a281dc ffff00000930bca0
[ 784.588945] bc60: ffff000000a28b88 0000000000c00149 0000000200000040 0000000007f6ffff
[ 784.597146] bc80: ffffffffffffffff ffff000000a280e4 ffff00000930bca0 ffff000000a28b88
[ 784.605790] [<ffff000000a28b88>] cm_req_handler+0xcd8/0xd18 [ib_cm]
[ 784.612783] [<ffff000000a28c98>] cm_work_handler+0xd0/0x11a8 [ib_cm]
[ 784.620007] [<ffff0000080df030>] process_one_work+0x128/0x2b0
[ 784.626144] [<ffff0000080df20c>] worker_thread+0x54/0x3c8
[ 784.632199] [<ffff0000080e4eb4>] kthread+0x100/0x12c
[ 784.637752] [<ffff000008085314>] ret_from_fork+0x10/0x18

thanks
Lijun Ou

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