Hi, I'm calling blk_queue_split kernel function from my driver to split larger BIO and that is working fine for block size 4K and 8K but getting below crash for block size 1M. Using stable 4.10.1 kernel version [ 890.227865] BUG: unable to handle kernel NULL pointer dereference at 0000000000000724 [ 890.305384] IP: _raw_spin_lock_irqsave+0x22/0x3f [ 890.343896] PGD 0 [ 891.381744] Call Trace: [ 891.415424] try_to_wake_up+0x40/0x3e0 [ 891.449074] ? mempool_free_slab+0x17/0x20 [ 891.483213] wake_up_process+0x15/0x20 [ 891.517492] blkdev_bio_end_io_simple+0x1d/0x20 [ 891.551363] bio_endio+0x56/0x60 Thx.
