KCSAN: data-race in __filemap_fdatawrite_range / __xa_set

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __filemap_fdatawrite_range / __xa_set_mark ext4				1	1406d	1406d	0/26	auto-closed as invalid on 2020/07/30 14:53
upstream	KCSAN: data-race in __filemap_fdatawrite_range / __xa_set_mark (2) ext4				2	1294d	1306d	0/26	auto-closed as invalid on 2020/11/19 10:40

================================================================== BUG: KCSAN: data-race in __filemap_fdatawrite_range / __xa_set_mark write to 0xffff88814062197c of 4 bytes by task 8085 on cpu 1: xa_mark_set lib/xarray.c:69 [inline] xas_set_mark lib/xarray.c:889 [inline] __xa_set_mark+0x187/0x1b0 lib/xarray.c:1898 __set_page_dirty+0x17e/0x1d0 fs/buffer.c:609 mark_buffer_dirty+0x126/0x230 fs/buffer.c:1137 __ext4_handle_dirty_metadata+0x20a/0x590 fs/ext4/ext4_jbd2.c:362 ext4_do_update_inode fs/ext4/inode.c:5135 [inline] ext4_mark_iloc_dirty+0x12ed/0x1650 fs/ext4/inode.c:5712 __ext4_mark_inode_dirty+0x450/0x610 fs/ext4/inode.c:5906 ext4_dirty_inode+0xa6/0xc0 fs/ext4/inode.c:5942 __mark_inode_dirty+0x74/0x740 fs/fs-writeback.c:2260 generic_update_time fs/inode.c:1764 [inline] update_time fs/inode.c:1777 [inline] file_update_time+0x3b0/0x3f0 fs/inode.c:1992 file_modified+0x62/0x80 fs/inode.c:2015 ext4_write_checks fs/ext4/file.c:248 [inline] ext4_buffered_write_iter+0x1f9/0x3d0 fs/ext4/file.c:265 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88814062197c of 4 bytes by task 15947 on cpu 0: xa_marked include/linux/xarray.h:416 [inline] mapping_tagged include/linux/fs.h:488 [inline] __filemap_fdatawrite_range+0x11c/0x1d0 mm/filemap.c:418 __filemap_fdatawrite mm/filemap.c:430 [inline] filemap_fdatawrite+0x22/0x30 mm/filemap.c:435 fdatawrite_one_bdev+0x28/0x30 fs/sync.c:86 iterate_bdevs+0x178/0x220 fs/block_dev.c:2144 ksys_sync+0x85/0xe0 fs/sync.c:117 __do_sys_sync+0xa/0x10 fs/sync.c:125 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: 15947 Comm: syz-executor.4 Not tainted 5.10.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================