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From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>
To:     John Stultz <john.stultz@linaro.org>,
        David Anderson <dvander@google.com>
CC:     Christoph Hellwig <hch@lst.de>,
        Johannes Thumshirn <Johannes.Thumshirn@wdc.com>,
        Damien Le Moal <Damien.LeMoal@wdc.com>,
        Jens Axboe <axboe@kernel.dk>,
        Alistair Delva <adelva@google.com>,
        Todd Kjos <tkjos@google.com>,
        Amit Pundir <amit.pundir@linaro.org>,
        YongQin Liu <yongqin.liu@linaro.org>,
        lkml <linux-kernel@vger.kernel.org>,
        "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>
Subject: Re: [REGRESSION] "split bio_kmalloc from bio_alloc_bioset" causing
 crash shortly after bootup
Thread-Topic: [REGRESSION] "split bio_kmalloc from bio_alloc_bioset" causing
 crash shortly after bootup
Thread-Index: AQHXCZD3vAo2wh9jek+o1gtQqbdo1w==
Date:   Tue, 23 Feb 2021 03:39:38 +0000
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On 2/22/21 19:07, John Stultz wrote:=0A=
> [   34.784901] ueventd: LoadWithAliases was unable to load platform:regul=
atory=0A=
> [   34.785313]  bio_alloc_bioset+0x14/0x230=0A=
> [   34.796189]  bio_clone_fast+0x28/0x80=0A=
> [   34.799848]  bio_split+0x50/0xd0=0A=
> [   34.803072]  blk_crypto_fallback_encrypt_bio+0x2ec/0x5e8=0A=
> [   34.808384]  blk_crypto_fallback_bio_prep+0xfc/0x140=0A=
> [   34.813345]  __blk_crypto_bio_prep+0x13c/0x150=0A=
> [   34.817784]  submit_bio_noacct+0x3c0/0x548=0A=
> [   34.821880]  submit_bio+0x48/0x200=0A=
> [   34.825278]  ext4_io_submit+0x50/0x68=0A=
> [   34.828939]  ext4_writepages+0x558/0xca8=0A=
> [   34.832860]  do_writepages+0x58/0x108=0A=
> [   34.836522]  __writeback_single_inode+0x44/0x510=0A=
> [   34.841137]  writeback_sb_inodes+0x1e0/0x4a8=0A=
> [   34.845404]  __writeback_inodes_wb+0x78/0xe8=0A=
> [   34.849670]  wb_writeback+0x274/0x3e8=0A=
> [   34.853328]  wb_workfn+0x308/0x5f0=0A=
> [   34.856726]  process_one_work+0x1ec/0x4d0=0A=
> [   34.860734]  worker_thread+0x44/0x478=0A=
> [   34.864392]  kthread+0x140/0x150=0A=
> [   34.867618]  ret_from_fork+0x10/0x30=0A=
> [   34.871197] Code: a9ba7bfd 910003fd f9000bf3 7900bfa1 (f9403441)=0A=
> [   34.877289] ---[ end trace e6c2a3ab108278f0 ]---=0A=
> [   34.893636] Kernel panic - not syncing: Oops: Fatal exception=0A=
>=0A=
=0A=
If you have time then until you get the reply from others, can you try=0A=
following patch ?=0A=
=0A=
diff --git a/block/bio.c b/block/bio.c=0A=
index a1c4d2900c7a..9976400ec66a 100644=0A=
--- a/block/bio.c=0A=
+++ b/block/bio.c=0A=
@@ -663,7 +663,10 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t=0A=
gfp_mask, struct bio_set *bs)=0A=
 {=0A=
        struct bio *b;=0A=
 =0A=
-       b =3D bio_alloc_bioset(gfp_mask, 0, bs);=0A=
+       if (bs)=0A=
+               b =3D bio_alloc_bioset(gfp_mask, 0, bs);=0A=
+       else=0A=
+               b =3D bio_kmalloc(gfp_mask, 0);=0A=
        if (!b)=0A=
                return NULL;=0A=
=0A=
P.S.This is purely based on the code inspection and it may not solve your=
=0A=
issue. Proceed with the caution as it may *break* your system.=0A=
=0A=