__range_close() closes through filp_close() so every file the caller held the last reference to is punted to task work. That costs one cmpxchg per file plus a list entry for any later task_work_cancel() to search under ->pi_lock. close_range(2) exists to close many descriptors in one go fast. So convert it to the same synchronous treatment as close(2) and close_files(). Flush and put each file inline while ->file_lock is dropped. close_range(2) now behaves like close(2). Signed-off-by: Christian Brauner (Amutable) --- fs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/file.c b/fs/file.c index b2b466dce7fb..178c8cb9da09 100644 --- a/fs/file.c +++ b/fs/file.c @@ -807,7 +807,7 @@ static inline void __range_close(struct files_struct *files, unsigned int fd, file = file_close_fd_locked(files, fd); if (file) { spin_unlock(&files->file_lock); - filp_close(file, files); + filp_close_sync(file, files); cond_resched(); spin_lock(&files->file_lock); fdt = files_fdtable(files); -- 2.53.0