On 10/13/2016 08:38 AM, Jitendra Bhivare wrote:
> [ 3843.132217] WARNING: CPU: 20 PID: 1227 at kernel/softirq.c:150 
> __local_bh_enable_ip+0x6b/0x90
> [ 3843.142815] Modules linked in:
> ...
> [ 3843.294328] CPU: 20 PID: 1227 Comm: kworker/20:1H Tainted: G            E  
>  4.8.0-rc1+ #3
> [ 3843.304944] Hardware name: Dell Inc. PowerEdge R720/0X6H47, BIOS 1.4.8 
> 10/25/2012
> [ 3843.314798] Workqueue: kblockd blk_timeout_work
> [ 3843.321350]  0000000000000086 00000000a32f4533 ffff8802216d7bd8 
> ffffffff8135c3cf
> [ 3843.331146]  0000000000000000 0000000000000000 ffff8802216d7c18 
> ffffffff8108d661
> [ 3843.340918]  00000096216d7c50 0000000000000200 ffff8802d07cc828 
> ffff8801b3632550
> [ 3843.350687] Call Trace:
> [ 3843.354866]  [<ffffffff8135c3cf>] dump_stack+0x63/0x84
> [ 3843.362061]  [<ffffffff8108d661>] __warn+0xd1/0xf0
> [ 3843.368851]  [<ffffffff8108d79d>] warn_slowpath_null+0x1d/0x20
> [ 3843.376791]  [<ffffffff810930eb>] __local_bh_enable_ip+0x6b/0x90
> [ 3843.384903]  [<ffffffff816fe7be>] _raw_spin_unlock_bh+0x1e/0x20
> [ 3843.392940]  [<ffffffffa085f710>] beiscsi_alloc_pdu+0x2f0/0x6e0 [be2iscsi]
> [ 3843.402076]  [<ffffffffa06bc358>] __iscsi_conn_send_pdu+0xf8/0x370 
> [libiscsi]
> [ 3843.411549]  [<ffffffffa06bc6fe>] iscsi_send_nopout+0xbe/0x110 [libiscsi]
> [ 3843.420639]  [<ffffffffa06bd98b>] iscsi_eh_cmd_timed_out+0x29b/0x2b0 
> [libiscsi]
> [ 3843.430339]  [<ffffffff814cd1de>] scsi_times_out+0x5e/0x250
> [ 3843.438119]  [<ffffffff813374af>] blk_rq_timed_out+0x1f/0x60
> [ 3843.446009]  [<ffffffff8133759d>] blk_timeout_work+0xad/0x150
> [ 3843.454010]  [<ffffffff810a6642>] process_one_work+0x152/0x400
> [ 3843.462114]  [<ffffffff810a6f35>] worker_thread+0x125/0x4b0
> [ 3843.469961]  [<ffffffff810a6e10>] ? rescuer_thread+0x380/0x380
> [ 3843.478116]  [<ffffffff810aca28>] kthread+0xd8/0xf0
> [ 3843.485212]  [<ffffffff816fedff>] ret_from_fork+0x1f/0x40
> [ 3843.492908]  [<ffffffff810ac950>] ? kthread_park+0x60/0x60
> [ 3843.500715] ---[ end trace 57ec0a1d8f0dd3a0 ]---
> [ 3852.328667] NMI watchdog: Watchdog detected hard LOCKUP on cpu 1Kernel 
> panic - not syncing: Hard LOCKUP
> 
> blk_timeout_work takes queue_lock spin_lock with interrupts disabled
> before invoking iscsi_eh_cmd_timed_out. This causes a WARN_ON_ONCE in
> spin_unlock_bh for wrb_lock/io_sgl_lock/mgmt_sgl_lock.
> 
> CPU was kept busy in lot of bottom half work with interrupts disabled
> thus causing hard lock up.
> 
> Signed-off-by: Jitendra Bhivare <jitendra.bhiv...@broadcom.com>
> ---
>  drivers/scsi/be2iscsi/be_main.c | 37 +++++++++++++++++++++++--------------
>  1 file changed, 23 insertions(+), 14 deletions(-)
> 
Reviewed-by: Hannes Reinecke <h...@suse.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Teamlead Storage & Networking
h...@suse.de                                   +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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