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.bhivare@xxxxxxxxxxxx> > --- > drivers/scsi/be2iscsi/be_main.c | 37 +++++++++++++++++++++++-------------- > 1 file changed, 23 insertions(+), 14 deletions(-) > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +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) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
