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SubjectRe: dirty balancing deadlock
From
Date
> --- a/fs/fs-writeback.c~a
> +++ a/fs/fs-writeback.c
> @@ -356,7 +356,7 @@ int generic_sync_sb_inodes(struct super_
> continue; /* Skip a congested blockdev */
> }
>
> - if (wbc->bdi && bdi != wbc->bdi) {
> + if (wbc->bdi && bdi != wbc->bdi && bdi_write_congested(bdi)) {
> if (!sb_is_blkdev_sb(sb))
> break; /* fs has the wrong queue */
> list_move(&inode->i_list, &sb->s_dirty);

Checking bdi_write_congested(bdi) is not reliable, since the queue can
become congested _after_ the check is done.

Miklos
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