https://bugzilla.kernel.org/show_bug.cgi?id=124651 --- Comment #2 from wangguang <35445233@xxxxxx> --- fs/ext4/inode.c:2263：mpage_prepare_extent_to_map： 2261： lblk = ((ext4_lblk_t)page->index) << (PAGE_CACHE_SHIFT - blkbits); 2263： head = page_buffers(page); EXT4 BUG_ON page_buffers() because a page goes to writeback without buffer-heads attached. I think unmap_page_range set the page dirty again Cause the problem。 I can recurrent the bug by: （1） mmap a file addr = (char *)mmap(NULL, MAPLEN, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); memset(addr, 'i', MAPLEN); （2） return err at ext4_writepages->mpage_map_and_submit_extent->mpage_map_one_extent Cause the log: ext4_msg(sb, KERN_CRIT, "Delayed block allocation failed for " "inode %lu at logical offset %llu with" " max blocks %u with error %d", inode->i_ino, (unsigned long long)map->m_lblk, (unsigned)map->m_len, -err); (3） Unmap case warning: WARNING: at fs/buffer.c:661 __set_page_dirty+0xaa/0xc0() (4) wait for sync，then bugon see the attachment please. -- You are receiving this mail because: You are watching the assignee of the bug.-- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
