KCSAN: data-race in atime_needs_update / ext4

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in atime_needs_update / ext4_truncate ext4	6				1	2087d	2087d	0/29	closed as invalid on 2019/11/19 13:44
upstream	KCSAN: data-race in atime_needs_update / ext4_truncate (3) ext4	6				1	1539d	1539d	0/29	auto-closed as invalid on 2021/06/10 01:49

================================================================== BUG: KCSAN: data-race in atime_needs_update / ext4_truncate read to 0xffff8880b4361150 of 8 bytes by task 25755 on cpu 0: relatime_need_update fs/inode.c:1643 [inline] atime_needs_update+0x1ea/0x360 fs/inode.c:1733 touch_atime+0x63/0x150 fs/inode.c:1748 file_accessed include/linux/fs.h:2226 [inline] generic_file_buffered_read mm/filemap.c:2243 [inline] generic_file_read_iter+0x11b0/0x14e0 mm/filemap.c:2309 ext4_file_read_iter fs/ext4/file.c:131 [inline] ext4_file_read_iter+0x103/0x360 fs/ext4/file.c:114 call_read_iter include/linux/fs.h:1901 [inline] generic_file_splice_read+0x2df/0x470 fs/splice.c:313 do_splice_to+0xc7/0x100 fs/splice.c:892 splice_direct_to_actor+0x1b9/0x540 fs/splice.c:971 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1576 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0xb8/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff8880b4361150 of 16 bytes by task 25758 on cpu 1: ext4_truncate+0x452/0x9e0 fs/ext4/inode.c:4236 ext4_setattr+0xe43/0x1290 fs/ext4/inode.c:5388 notify_change+0x82b/0xad0 fs/attr.c:336 do_truncate+0xf9/0x180 fs/open.c:64 handle_truncate fs/namei.c:2887 [inline] do_open fs/namei.c:3233 [inline] path_openat+0x1e51/0x23d0 fs/namei.c:3346 do_filp_open+0x11e/0x1b0 fs/namei.c:3373 do_sys_openat2+0x52e/0x680 fs/open.c:1148 do_sys_open+0xa2/0x110 fs/open.c:1164 ksys_open include/linux/syscalls.h:1386 [inline] __do_sys_creat fs/open.c:1232 [inline] __se_sys_creat fs/open.c:1230 [inline] __x64_sys_creat+0x42/0x60 fs/open.c:1230 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 25758 Comm: syz-executor.4 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================