================================================================== BUG: KCSAN: data-race in ext4_ext_insert_extent / ext4_mark_iloc_dirty write to 0xffff88811d8a044a of 2 bytes by task 17984 on cpu 1: le16_add_cpu include/linux/byteorder/generic.h:146 [inline] ext4_ext_insert_extent+0x11f1/0x2b80 fs/ext4/extents.c:2112 ext4_ext_map_blocks+0x1776/0x20c0 fs/ext4/extents.c:4259 ext4_map_blocks+0x6bf/0xf40 fs/ext4/inode.c:625 mpage_map_one_extent+0x10d/0x3c0 fs/ext4/inode.c:2376 mpage_map_and_submit_extent fs/ext4/inode.c:2429 [inline] ext4_writepages+0xa4c/0x1ed0 fs/ext4/inode.c:2781 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:422 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:655 filemap_write_and_wait include/linux/fs.h:2630 [inline] iomap_bmap+0x68/0x110 fs/iomap/fiemap.c:130 ext4_bmap+0x20b/0x220 fs/ext4/inode.c:3214 bmap+0x56/0x80 fs/inode.c:1703 ioctl_fibmap fs/ioctl.c:74 [inline] file_ioctl fs/ioctl.c:531 [inline] do_vfs_ioctl+0xd44/0xec0 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811d8a0448 of 4 bytes by task 17981 on cpu 0: ext4_do_update_inode fs/ext4/inode.c:5042 [inline] ext4_mark_iloc_dirty+0xc84/0x1660 fs/ext4/inode.c:5624 __ext4_mark_inode_dirty+0x448/0x630 fs/ext4/inode.c:5818 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5854 __mark_inode_dirty+0x72/0x7f0 fs/fs-writeback.c:2260 mark_inode_dirty include/linux/fs.h:2169 [inline] generic_write_end+0x166/0x250 fs/buffer.c:2202 ext4_da_write_end+0x57e/0x760 fs/ext4/inode.c:3091 generic_perform_write+0x23b/0x390 mm/filemap.c:3516 ext4_buffered_write_iter+0x2cc/0x3b0 fs/ext4/file.c:269 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784 call_write_iter include/linux/fs.h:1882 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x665/0x6f0 fs/read_write.c:586 ksys_write+0xce/0x180 fs/read_write.c:639 __do_sys_write fs/read_write.c:651 [inline] __se_sys_write fs/read_write.c:648 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:648 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 17981 Comm: syz-executor.0 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================