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SubjectRe: [PATCH] [fuse] alloc_page nofs avoid deadlock
On Thu 03-06-21 20:41:05, chenguanyou wrote:
> ABA deadlock
>
> PID: 17172 TASK: ffffffc0c162c000 CPU: 6 COMMAND: "Thread-21"
>
> PID: 9652 TASK: ffffffc0c9ce0000 CPU: 4 COMMAND: "kworker/u16:8"

Please be much more specific about the underlying issue and what the
actual lock dependency during the reclaim is. The above is essentially
void of any relevant information.

> Signed-off-by: chenguanyou <chenguanyou@xiaomi.com>
> ---
> fs/fuse/dev.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index c0fee830a34e..d36125ff0405 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -721,7 +721,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
> if (cs->nr_segs >= cs->pipe->max_usage)
> return -EIO;
>
> - page = alloc_page(GFP_HIGHUSER);
> + page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
> if (!page)
> return -ENOMEM;
>
> --
> 2.17.1

--
Michal Hocko
SUSE Labs

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