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SubjectRe: [REGRESSION] "split bio_kmalloc from bio_alloc_bioset" causing crash shortly after bootup
Date
On 2/22/21 19:07, John Stultz wrote:
> [ 34.784901] ueventd: LoadWithAliases was unable to load platform:regulatory
> [ 34.785313] bio_alloc_bioset+0x14/0x230
> [ 34.796189] bio_clone_fast+0x28/0x80
> [ 34.799848] bio_split+0x50/0xd0
> [ 34.803072] blk_crypto_fallback_encrypt_bio+0x2ec/0x5e8
> [ 34.808384] blk_crypto_fallback_bio_prep+0xfc/0x140
> [ 34.813345] __blk_crypto_bio_prep+0x13c/0x150
> [ 34.817784] submit_bio_noacct+0x3c0/0x548
> [ 34.821880] submit_bio+0x48/0x200
> [ 34.825278] ext4_io_submit+0x50/0x68
> [ 34.828939] ext4_writepages+0x558/0xca8
> [ 34.832860] do_writepages+0x58/0x108
> [ 34.836522] __writeback_single_inode+0x44/0x510
> [ 34.841137] writeback_sb_inodes+0x1e0/0x4a8
> [ 34.845404] __writeback_inodes_wb+0x78/0xe8
> [ 34.849670] wb_writeback+0x274/0x3e8
> [ 34.853328] wb_workfn+0x308/0x5f0
> [ 34.856726] process_one_work+0x1ec/0x4d0
> [ 34.860734] worker_thread+0x44/0x478
> [ 34.864392] kthread+0x140/0x150
> [ 34.867618] ret_from_fork+0x10/0x30
> [ 34.871197] Code: a9ba7bfd 910003fd f9000bf3 7900bfa1 (f9403441)
> [ 34.877289] ---[ end trace e6c2a3ab108278f0 ]---
> [ 34.893636] Kernel panic - not syncing: Oops: Fatal exception
>

If you have time then until you get the reply from others, can you try
following patch ?

diff --git a/block/bio.c b/block/bio.c
index a1c4d2900c7a..9976400ec66a 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -663,7 +663,10 @@ struct bio *bio_clone_fast(struct bio *bio, gfp_t
gfp_mask, struct bio_set *bs)
{
struct bio *b;

- b = bio_alloc_bioset(gfp_mask, 0, bs);
+ if (bs)
+ b = bio_alloc_bioset(gfp_mask, 0, bs);
+ else
+ b = bio_kmalloc(gfp_mask, 0);
if (!b)
return NULL;

P.S.This is purely based on the code inspection and it may not solve your
issue. Proceed with the caution as it may *break* your system.

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