On Thu, Sep 01 2016 at 3:05pm -0400,
Mike Snitzer <snitzer@xxxxxxxxxx> wrote:
> On Thu, Sep 01 2016 at 1:59pm -0400,
> Bart Van Assche <bart.vanassche@xxxxxxxxxxx> wrote:
>
> > * A "if (!blk_queue_stopped(q))" test needs to be added in
> > dm_stop_queue() to avoid the following hang (that test was present
> > in my version of the patch that adds the
> > blk_mq_{freeze,unfreeze}_queue() calls):
> >
> > sysrq: SysRq : Show Blocked State
> > task PC stack pid father
> > multipathd D ffff8803c8d37b80 0 3242 1 0x00000000
> > Call Trace:
> > [<ffffffff81627087>] schedule+0x37/0x90
> > [<ffffffff813097e1>] blk_mq_freeze_queue_wait+0x51/0xb0
> > [<ffffffff8130be05>] blk_mq_freeze_queue+0x15/0x20
> > [<ffffffffa034d882>] dm_stop_queue+0x62/0xc0 [dm_mod]
> > [<ffffffffa0342a1b>] dm_swap_table+0x2fb/0x370 [dm_mod]
> > [<ffffffffa0347875>] dev_suspend+0x95/0x220 [dm_mod]
> > [<ffffffffa03480fc>] ctl_ioctl+0x1fc/0x550 [dm_mod]
> > [<ffffffffa034845e>] dm_ctl_ioctl+0xe/0x20 [dm_mod]
> > [<ffffffff811ee27f>] do_vfs_ioctl+0x8f/0x690
> > [<ffffffff811ee8bc>] SyS_ioctl+0x3c/0x70
> > [<ffffffff8162d125>] entry_SYSCALL_64_fastpath+0x18/0xa8
>
> OK, I've adjusted accordingly and pushed dm-4.8 and dm-4.9 again (with
> force, sorry about that).
I'm testing the result.. needs more time. I'll let you know once my
mptest-based testing passes. (I think I'm holding the q->lock too
long in dm_mq_stop_queue()).
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