Re: [PATCH] IB/core: Fix for core panic

Greg KH
2018-11-28T10:57:00Z

On Tue, Nov 27, 2018 at 03:35:43PM -0800, Mike Marciniszyn wrote:
> From: Alex Estrin <alex.estrin@intel.com>
>
> Upstream commit e6f9bc34d3779cb7b6a337afed5de8be3f0fab77.
>
> Build with the latest patches resulted in panic:
> 11384.486289] BUG: unable to handle kernel NULL pointer dereference at
> (null)
> [11384.486293] IP: (null)
> [11384.486295] PGD 0
> [11384.486295] P4D 0
> [11384.486296]
> [11384.486299] Oops: 0010 [#1] SMP
> ......... snip ......
> [11384.486401] CPU: 0 PID: 3389 Comm: kworker/0:2H Not tainted 4.9.136 #1
> [11384.486402] Hardware name: Intel Corporation S2600WT2R/S2600WT2R,
> BIOS SE5C610.86B.01.01.0014.121820151719 12/18/2015
> [11384.486418] Workqueue: ib-comp-wq ib_cq_poll_work [ib_core]
> [11384.486419] task: ffff880850579680 task.stack: ffffc90007fec000
> [11384.486420] RIP: 0010: (null)
> [11384.486420] RSP: 0018:ffffc90007fef970 EFLAGS: 00010206
> [11384.486421] RAX: ffff88084cfe8000 RBX: ffff88084dce4000 RCX: ffffc90007fef978
> [11384.486422] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88084cfe8000
> [11384.486422] RBP: ffffc90007fefab0 R08: 0000000000000000 R09: ffff88084dce4080
> [11384.486423] R10: ffffffffa02d7f60 R11: 0000000000000000 R12: ffff88105af65a00
> [11384.486423] R13: ffff88084dce4000 R14: 000000000000c000 R15: 000000000000c000
> [11384.486424] FS: 0000000000000000(0000) GS:ffff88085f400000(0000) knlGS:0000000000000000
> [11384.486425] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [11384.486425] CR2: 0000000000000000 CR3: 0000000001c09000 CR4: 00000000001406f0
> [11384.486426] Call Trace:
> [11384.486431] ? is_valid_mcast_lid.isra.21+0xfb/0x110 [ib_core]
> [11384.486436] ib_attach_mcast+0x6f/0xa0 [ib_core]
> [11384.486441] ipoib_mcast_attach+0x81/0x190 [ib_ipoib]
> [11384.486443] ipoib_mcast_join_complete+0x354/0xb40 [ib_ipoib]
> [11384.486448] mcast_work_handler+0x330/0x6c0 [ib_core]
> [11384.486452] join_handler+0x101/0x220 [ib_core]
> [11384.486455] ib_sa_mcmember_rec_callback+0x54/0x80 [ib_core]
> [11384.486459] recv_handler+0x3a/0x60 [ib_core]
> [11384.486462] ib_mad_recv_done+0x423/0x9b0 [ib_core]
> [11384.486466] __ib_process_cq+0x5d/0xb0 [ib_core]
> [11384.486469] ib_cq_poll_work+0x20/0x60 [ib_core]
> [11384.486472] process_one_work+0x149/0x360
> [11384.486474] worker_thread+0x4d/0x3c0
> [11384.486487] kthread+0x109/0x140
> [11384.486488] ? rescuer_thread+0x380/0x380
> [11384.486489] ? kthread_park+0x60/0x60
> [11384.486490] ? kthread_park+0x60/0x60
> [11384.486493] ret_from_fork+0x25/0x30
> [11384.486493] Code: Bad RIP value.
> [11384.486493] Code: Bad RIP value.
> [11384.486496] RIP: (null) RSP: ffffc90007fef970
> [11384.486497] CR2: 0000000000000000
> [11384.486531] ---[ end trace b1acec6fb4ff6e75 ]---
> [11384.532133] Kernel panic - not syncing: Fatal exception
> [11384.536541] Kernel Offset: disabled
> [11384.969491] ---[ end Kernel panic - not syncing: Fatal exception
> [11384.976875] sched: Unexpected reschedule of offline CPU#1!
> [11384.983646] ------------[ cut here ]------------
>
> Rdma device driver may not have implemented (*get_link_layer)()
> so it can not be called directly. Should use appropriate helper function.
>
> [cherry-picked from the upstream commit]
>
> Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
> Fixes: 523633359224 ("IB/core: Fix the validations of a multicast LID in attach or detach operations")
> Cc: stable@kernel.org # 4.9

Now queued up, thanks.

greg k-h