linux-kernel - Re: [REGRESSION] "split bio_kmalloc from bio_alloc_bioset" causing crash shortly after bootup

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Date:   Tue, 23 Feb 2021 08:04:08 +0100
From:   Christoph Hellwig <hch@....de>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Christoph Hellwig <hch@....de>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        Damien Le Moal <damien.lemoal@....com>,
        Jens Axboe <axboe@...nel.dk>,
        David Anderson <dvander@...gle.com>,
        Alistair Delva <adelva@...gle.com>,
        Todd Kjos <tkjos@...gle.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        YongQin Liu <yongqin.liu@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        Satya Tangirala <satyat@...gle.com>
Subject: Re: [REGRESSION] "split bio_kmalloc from bio_alloc_bioset" causing
 crash shortly after bootup

The problem is that the blk-crypto fallback code calls bio_split
with a NULL bioset.  That was aready broken before, as the mempool
needed to guarantee forward progress was missing, but is not fatal.

Satya, can you look into adding a mempool that can guarantees forward
progress here?