KCSAN: data-race in ext4_setattr / mpage_submit

Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_setattr / mpage_submit_page (3) ext4	4	1437d	1516d	0/26	auto-closed as invalid on 2020/06/18 14:03
upstream	KCSAN: data-race in ext4_setattr / mpage_submit_page (2) ext4	1	1594d	1594d	0/26	auto-closed as invalid on 2020/02/16 17:06
upstream	KCSAN: data-race in ext4_setattr / mpage_submit_page ext4	1	1631d	1631d	0/26	closed as invalid on 2019/11/19 13:24

================================================================== BUG: KCSAN: data-race in ext4_setattr / mpage_submit_page write to 0xffff88811f0e11f8 of 8 bytes by task 14494 on cpu 0: i_size_write include/linux/fs.h:896 [inline] ext4_setattr+0xd50/0xeb0 fs/ext4/inode.c:5386 notify_change+0x7d4/0xa20 fs/attr.c:336 do_truncate+0xe0/0x120 fs/open.c:64 handle_truncate fs/namei.c:2901 [inline] do_open fs/namei.c:3247 [inline] path_openat+0x1a4c/0x20e0 fs/namei.c:3360 do_filp_open+0xbd/0x1d0 fs/namei.c:3387 do_sys_openat2+0x33c/0x4a0 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] __do_sys_openat fs/open.c:1209 [inline] __se_sys_openat fs/open.c:1204 [inline] __x64_sys_openat+0xef/0x110 fs/open.c:1204 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811f0e11f8 of 8 bytes by task 14490 on cpu 1: i_size_read include/linux/fs.h:874 [inline] mpage_submit_page+0x67/0x170 fs/ext4/inode.c:2076 mpage_map_and_submit_buffers fs/ext4/inode.c:2330 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2469 [inline] ext4_writepages+0x106b/0x1cb0 fs/ext4/inode.c:2782 do_writepages+0x7b/0x150 mm/page-writeback.c:2354 __filemap_fdatawrite_range+0x19b/0x1d0 mm/filemap.c:421 __filemap_fdatawrite mm/filemap.c:429 [inline] filemap_flush+0x1f/0x30 mm/filemap.c:456 ext4_alloc_da_blocks+0x4c/0x130 fs/ext4/inode.c:3146 ext4_release_file+0x36/0x180 fs/ext4/file.c:142 __fput+0x1df/0x460 fs/file_table.c:281 ____fput+0x11/0x20 fs/file_table.c:314 task_work_run+0x8e/0x110 kernel/task_work.c:123 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x1c8/0x230 arch/x86/entry/common.c:246 __syscall_return_slowpath arch/x86/entry/common.c:329 [inline] do_syscall_64+0xb9/0x120 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 14490 Comm: syz-executor.0 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================