KCSAN: data-race in ext4_setattr / ondemand

Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_setattr / ondemand_readahead ext4	2	1665d	1675d	0/28	auto-closed as invalid on 2020/11/01 00:03
upstream	KCSAN: data-race in ext4_setattr / ondemand_readahead (3) ext4	8	1348d	1420d	0/28	auto-closed as invalid on 2021/09/14 04:27
upstream	KCSAN: data-race in ext4_setattr / ondemand_readahead (4) ext4	3	1266d	1310d	0/28	auto-closed as invalid on 2021/12/05 11:41

================================================================== BUG: KCSAN: data-race in ext4_setattr / ondemand_readahead write to 0xffff888134dfcbc0 of 8 bytes by task 23252 on cpu 1: i_size_write include/linux/fs.h:872 [inline] ext4_setattr+0xd54/0xec0 fs/ext4/inode.c:5483 notify_change+0x8a3/0xa80 fs/attr.c:398 do_truncate+0xe8/0x130 fs/open.c:64 handle_truncate fs/namei.c:3020 [inline] do_open fs/namei.c:3371 [inline] path_openat+0x1a79/0x20b0 fs/namei.c:3500 do_filp_open+0xd9/0x1f0 fs/namei.c:3527 do_sys_openat2+0xa3/0x250 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_creat fs/open.c:1277 [inline] __se_sys_creat fs/open.c:1271 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1271 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888134dfcbc0 of 8 bytes by task 23231 on cpu 0: i_size_read include/linux/fs.h:850 [inline] do_page_cache_ra mm/readahead.c:254 [inline] ondemand_readahead+0x511/0x7a0 mm/readahead.c:549 page_cache_sync_ra+0x95/0xd0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:840 [inline] filemap_get_pages mm/filemap.c:2375 [inline] filemap_read+0x380/0x1210 mm/filemap.c:2458 generic_file_read_iter+0x84/0x3e0 mm/filemap.c:2609 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23231 Comm: syz-executor.4 Tainted: G W 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================