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From: ming.lei@redhat.com (Ming Lei)
Subject: BUG: NULL pointer at IP: blk_mq_map_swqueue+0xbc/0x200 on 4.15.0-rc2
Date: Tue, 12 Dec 2017 17:16:59 +0800	[thread overview]
Message-ID: <20171212091658.GA8529@ming.t460p> (raw)
In-Reply-To: <20171212083502.GA10646@infradead.org>

On Tue, Dec 12, 2017@12:35:02AM -0800, Christoph Hellwig wrote:
> On Mon, Dec 11, 2017@11:58:45AM +0800, Ming Lei wrote:
> > As we talked offline, this IP points to cpumask_set_cpu(), seems this
> > case may happen when one CPU isn't mapped to any hw queue, could you test
> > the following patch to see if it helps your issue?
> 
> This looks odd as mq_map should be pre-zeroed.  If it isn't we have
> a few more problems..

This happens in case of updating nr_hw_queue, for example, when the
number becomes 5 from 12, then the table has to be zeroed for avoiding
obsolete mapping if one CPU isn't mapped to any hw queue.

Thanks,
Ming

  reply	other threads:[~2017-12-12  9:16 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <799322399.34367785.1512659684033.JavaMail.zimbra@redhat.com>
2017-12-08  7:24 ` BUG: NULL pointer at IP: blk_mq_map_swqueue+0xbc/0x200 on 4.15.0-rc2 Yi Zhang
2017-12-11  3:58   ` Ming Lei
2017-12-11 13:29     ` Yi Zhang
2017-12-11 13:47       ` Ming Lei
2017-12-12  8:35     ` Christoph Hellwig
2017-12-12  9:16       ` Ming Lei [this message]
2018-01-05 16:39         ` Jens Axboe
2018-01-06  8:38           ` Ming Lei

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