Offering: HULK hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IBYXQD --------------------------- When using null_blk with a large readahead window, calling madvise to trigger readahead can lead to system softlocks. This occurs because the CPU can remain in the mpage_readpages loop for extended periods without rescheduling, preventing other processes from running. Add a cond_resched() call at the beginning of each loop iteration to allow the CPU to schedule other tasks when necessary, avoiding potential softlocks during heavy readahead operations. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Zheng Qixing <zhengqixing@huawei.com> --- fs/mpage.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/mpage.c b/fs/mpage.c index fb2ff971c66b..d67a2bae0b87 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -394,6 +394,7 @@ mpage_readpages(struct address_space *mapping, struct list_head *pages, for (page_idx = 0; page_idx < nr_pages; page_idx++) { struct page *page = lru_to_page(pages); + cond_resched(); prefetchw(&page->flags); list_del(&page->lru); if (!add_to_page_cache_lru(page, mapping, -- 2.39.2