v4.16-rc1 + dm-mpath + BFQ

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Hello Paolo,

If I enable the BFQ scheduler for a dm-mpath device then a kernel oops
appears (see also below). This happens systematically with Linus' tree from
this morning (commit 54ce685cae30) merged with Jens' for-linus branch (commit
a78773906147 ("block, bfq: add requeue-request hook")) and for-next branch
(commit 88455ad7f928). Is this a known issue?

Thanks,

Bart.

BUG: unable to handle kernel NULL pointer dereference at 0000000000000200
IP: rb_erase+0x284/0x380
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP
CPU: 1 PID: 0 Comm: swapper/1 Tainted: G        W        4.15.0-dbg+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:rb_erase+0x284/0x380
Call Trace:
 <IRQ>
 elv_rb_del+0x20/0x30
 bfq_remove_request+0x8d/0x2e0 [bfq]
 bfq_finish_requeue_request+0x2bb/0x390 [bfq]
 blk_mq_free_request+0x51/0x170
 dm_softirq_done+0xd5/0x240 [dm_mod]
 flush_smp_call_function_queue+0x92/0x140
 smp_call_function_single_interrupt+0x47/0x2b0
 call_function_single_interrupt+0xa2/0xb0
 </IRQ>




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