Re: [PATCH v2] blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()

[Jens Axboe]

On Mon, 16 Mar 2026 07:03:59 +0000, Yuto Ohnuki wrote:
> wbt_init_enable_default() uses WARN_ON_ONCE to check for failures from
> wbt_alloc() and wbt_init(). However, both are expected failure paths:
> 
> - wbt_alloc() can return NULL under memory pressure (-ENOMEM)
> - wbt_init() can fail with -EBUSY if wbt is already registered
> 
> syzbot triggers this by injecting memory allocation failures during MTD
> partition creation via ioctl(BLKPG), causing a spurious warning.
> 
> [...]

Applied, thanks!

[1/1] blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
      commit: e9b004ff83067cdf96774b45aea4b239ace99a2f

Best regards,
-- 
Jens Axboe