Hi, based on the ideas from Jan and Mateusz, I sent a fix patch, see
https://lore.kernel.org/linux-fsdevel/20240805013446.814357-1-chengzhihao@xxxxxxxxxxxxxxx/T/#u
在 2024/7/12 14:27, Zhihao Cheng 写道:
Hi. Recently, we found a deadlock in inode recliaiming process caused by
circular dependence between file inode and file's xattr inode.
Problem description
===================
The inode reclaiming process(See function prune_icache_sb) collects all
reclaimable inodes and mark them with I_FREEING flag at first, at that
time, other processes will be stuck if they try getting these inodes(See
function find_inode_fast), then the reclaiming process destroy the
inodes by function dispose_list().
Some filesystems(eg. ext4 with ea_inode feature, ubifs with xattr) may
do inode lookup in the inode evicting callback function, if the inode
lookup is operated under the inode lru traversing context, deadlock
problems may happen.
