linux-kernel - Re: random: GFP_KERNEL from irq context

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Message-ID: <323b0878-1352-90ab-6ada-b686750fd635@kernel.dk>
Date:   Thu, 26 Apr 2018 22:11:53 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     "Theodore Y. Ts'o" <tytso@....edu>, jannh@...gle.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: random: GFP_KERNEL from irq context

On 4/26/18 3:03 PM, Theodore Y. Ts'o wrote:
> On Thu, Apr 26, 2018 at 10:28:13AM -0600, Jens Axboe wrote:
>> during boot. We end up doing the numa_crng_init() from interrupt context, which
>> makes things unhappy since you do GFP_KERNEL | __GFP_NOFAIL allocations from
>> there.
> 
> I've already sent a pull request to Linux to fix this; see the
> random.git tree.
> 
> Apologies for not noticing this earlier.  My test environment had
> virtio-rng enabled by default, and while I did test the CONFIG_NUMA
> case, the call to add randomness doesn't happen from interrupt context
> with virtio-rng so I missed it in my testing.

OK, all good, just wanted to ensure it was known.

-- 
Jens Axboe