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Date:   Thu, 24 Dec 2020 07:56:42 +1100
From:   Herbert Xu <>
To:     "Maciej S. Szmigiero" <>
Cc:     Ignat Korchagin <>,,,,,,,,,,,
        Chris Mason <>, Josef Bacik <>,
        David Sterba <>,,
        linux-crypto <>
Subject: Re: dm-crypt with no_read_workqueue and no_write_workqueue + btrfs
 scrub = BUG()

On Wed, Dec 23, 2020 at 04:37:34PM +0100, Maciej S. Szmigiero wrote:
> It looks like to me that the skcipher API might not be safe to
> call from a softirq context, after all.

skcipher is safe to use in a softirq.  The problem is only in
dm-crypt where it tries to allocate memory with GFP_NOIO.

Email: Herbert Xu <>
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