================================================================== BUG: KCSAN: data-race in atime_needs_update / generic_update_time write to 0xffff8880b5956410 of 16 bytes by task 14413 on cpu 0: generic_update_time+0x109/0x270 fs/inode.c:1675 update_time+0x7d/0x90 fs/inode.c:1695 file_update_time+0x205/0x2d0 fs/inode.c:1910 file_modified fs/inode.c:1933 [inline] file_modified+0x60/0x80 fs/inode.c:1918 ext4_dio_write_checks fs/ext4/file.c:430 [inline] ext4_dio_write_iter fs/ext4/file.c:494 [inline] ext4_file_write_iter+0xad5/0xd30 fs/ext4/file.c:640 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x137/0x3a0 fs/read_write.c:980 vfs_iter_write+0x56/0x80 fs/read_write.c:1040 iter_file_splice_write+0x530/0x830 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x97/0xb0 fs/splice.c:1037 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992 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:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880b5956418 of 8 bytes by task 14420 on cpu 1: timespec64_compare include/linux/time64.h:58 [inline] relatime_need_update fs/inode.c:1643 [inline] atime_needs_update+0x232/0x360 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+0x12fa/0x18c0 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:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 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: 14420 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================