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	1442d	1521d	0/26	auto-closed as invalid on 2020/06/18 14:03
upstream	KCSAN: data-race in ext4_setattr / mpage_submit_page (4) ext4	1	1397d	1397d	0/26	auto-closed as invalid on 2020/08/02 08:15
upstream	KCSAN: data-race in ext4_setattr / mpage_submit_page ext4	1	1636d	1636d	0/26	closed as invalid on 2019/11/19 13:24

================================================================== BUG: KCSAN: data-race in ext4_setattr / mpage_submit_page write to 0xffff888128878c78 of 8 bytes by task 23460 on cpu 0: i_size_write include/linux/fs.h:888 [inline] ext4_setattr+0xca8/0x15a0 fs/ext4/inode.c:5642 notify_change+0x7e1/0xaa0 fs/attr.c:337 do_truncate+0xfb/0x180 fs/open.c:64 handle_truncate fs/namei.c:2998 [inline] do_last fs/namei.c:3414 [inline] path_openat+0x2f48/0x36e0 fs/namei.c:3525 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 __do_sys_openat fs/open.c:1124 [inline] __se_sys_openat fs/open.c:1118 [inline] __x64_sys_openat+0x62/0x80 fs/open.c:1118 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888128878c78 of 8 bytes by task 23442 on cpu 1: mpage_submit_page+0x81/0x1a0 fs/ext4/inode.c:2216 mpage_map_and_submit_buffers+0x331/0x520 fs/ext4/inode.c:2422 mpage_map_and_submit_extent fs/ext4/inode.c:2556 [inline] ext4_writepages+0x1458/0x2300 fs/ext4/inode.c:2869 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x1c5/0x230 mm/filemap.c:421 __filemap_fdatawrite mm/filemap.c:429 [inline] filemap_flush+0x2d/0x40 mm/filemap.c:456 ext4_alloc_da_blocks+0x78/0x180 fs/ext4/inode.c:3243 ext4_release_file+0x10d/0x200 fs/ext4/file.c:88 __fput+0x1e1/0x520 fs/file_table.c:280 ____fput+0x1f/0x30 fs/file_table.c:313 task_work_run+0xf6/0x130 kernel/task_work.c:113 get_signal+0x12c3/0x1320 kernel/signal.c:2528 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:159 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x353/0x370 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 23442 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================