Re: [PATCH] md/raid5: fix soft lockup in retry_aligned_read()

["Yu Kuai" <yukuai@fnnas.com>]

在 2026/4/2 14:14, Chia-Ming Chang 写道:

> When retry_aligned_read() encounters an overlapped stripe, it releases
> the stripe via raid5_release_stripe() which puts it on the lockless
> released_stripes llist. In the next raid5d loop iteration,
> release_stripe_list() drains the stripe onto handle_list (since
> STRIPE_HANDLE is set by the original IO), but retry_aligned_read()
> runs before handle_active_stripes() and removes the stripe from
> handle_list via find_get_stripe() -> list_del_init(). This prevents
> handle_stripe() from ever processing the stripe to resolve the
> overlap, causing an infinite loop and soft lockup.
>
> Fix this by using __release_stripe() with temp_inactive_list instead
> of raid5_release_stripe() in the failure path, so the stripe does not
> go through the released_stripes llist. This allows raid5d to break out
> of its loop, and the overlap will be resolved when the stripe is
> eventually processed by handle_stripe().
>
> Fixes: 773ca82fa1ee ("raid5: make release_stripe lockless")
> Cc:stable@vger.kernel.org
> Signed-off-by: FengWei Shih<dannyshih@synology.com>
> Signed-off-by: Chia-Ming Chang<chiamingc@synology.com>
> ---
>   drivers/md/raid5.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
Applied to md-7.1

-- 
Thansk,
Kuai